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Alector, Inc.

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FY2018 Annual Report · Alector, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

(Mark One)
☒

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018
OR

☐

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE
TRANSITION PERIOD FROM                      TO                     

Commission File Number 001-38792

Alector, Inc.

(Exact name of Registrant as specified in its Charter)

Delaware
(State or other jurisdiction of
incorporation or organization)
151 Oyster Point Blvd, Suite 300
South San Francisco, California
(Address of principal executive offices)

82-2933343
(I.R.S. Employer
Identification No.)

94080
(Zip Code)

Registrant’s telephone number, including area code: 415-231-5660

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Common Stock, Par Value $0.0001

Name of Each Exchange on Which Registered

The NASDAQ Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES ☐ NO ☒
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES ☐ NO ☒
Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such
shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES ☒ NO ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)
during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). YES ☒ NO ☐
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405) is not contained herein, and will not be contained, to the best of registrant’s knowledge,
in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ☒
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions
of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer

   Accelerated filer

  ☐

  ☐

Non-accelerated filer

Emerging growth company

  ☒
  ☒

   Smaller reporting company

  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards
provided pursuant to Section 13(a) of the Exchange Act.  ☒
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES ☐ NO ☒
The registrant was not a public company as of the last business day of its most recently completed second fiscal quarter and therefore, cannot calculate the aggregate market value of its voting and non-
voting common equity held by non-affiliates as of such date. The number of shares of the registrant’s Common Stock outstanding as of March 1, 2019 was 68,871,167.
Portions of the registrant’s Definitive Proxy Statement relating to the registrant’s Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K
where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s 2018 fiscal year ended December 31,
2018.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
  
 
TABLE OF CONTENTS

Alector, Inc.
Annual Report on Form 10-K

PART I
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV
Item 15.
Item 16

Business
Risk Factors
Unresolved Staff Comments
Properties
Legal Proceedings
Mine Safety Disclosures

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Selected Financial Data
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accounting Fees and Services

Exhibits, Financial Statement Schedules
Form 10-K Summary
Signatures

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements. All statements other than statements of historical facts contained in this

report, including statements regarding our future results of operations and financial position, business strategy, product candidates, planned preclinical studies
and clinical trials, results of clinical trials, research and development costs, regulatory approvals, timing and likelihood of success, as well as plans and
objectives of management for future operations, are forward-looking statements. These statements involve known and unknown risks, uncertainties, and other
important factors that are in some cases beyond our control and may cause our actual results, performance, or achievements to be materially different from
any future results, performance, or achievements expressed or implied by the forward-looking statements.

In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “would,” “expect,” “plan,” “anticipate,”
“could,” “intend,” “target,” “project,” “contemplate,” “believe,” “estimate,” “predict,” “potential,” or “continue” or the negative of these terms or other
similar expressions. Forward-looking statements contained in this report include, but are not limited to, statements about:

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the ability of our clinical trials to demonstrate safety and efficacy of our product candidates, and other positive results;

the timing and focus of our future clinical trials, and the reporting of data from those trials;

our plans relating to commercializing our product candidates, if approved, including the geographic areas of focus and sales strategy;

the expected potential benefits of strategic collaborations with third parties and our ability to attract collaborators with development,
regulatory and commercialization expertise;

our estimates of the number of patients in the United States who suffer from the diseases we are targeting and the number of patients that will
enroll in our clinical trials;

the size of the market opportunity for our product candidates in each of the diseases we are targeting;

our ability to expand our product candidates into additional indications and patient populations;

the success of competing therapies that are or may become available;

the beneficial characteristics, safety, efficacy, and therapeutic effects of our product candidates;

the timing or likelihood of regulatory filings and approvals, including our expectation to seek special designations, such as orphan drug
designation, for our product candidates for various diseases;

our ability to obtain and maintain regulatory approval of our product candidates;

our plans relating to the further development and manufacturing of our product candidates, including additional indications for which we may
pursue;

existing regulations and regulatory developments in the United States and other jurisdictions;

our continued reliance on third parties to conduct additional clinical trials of our product candidates, and for the manufacture of our product
candidates for preclinical studies and clinical trials;

our plans and ability to obtain or protect intellectual property rights, including extensions of existing patent terms where available;

the need to hire additional personnel and our ability to attract and retain such personnel;

the accuracy of our estimates regarding expenses, future revenue, capital requirements, and needs for additional financing;

our financial performance;

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the sufficiency of our existing cash and cash equivalents to fund our future operating expenses and capital expenditure requirements; and

our expectations regarding the period during which we will qualify as an emerging growth company under the Jumpstart Our Business
Startups Act of 2012 (JOBS Act).

We have based these forward-looking statements largely on our current expectations and projections about our business, the industry in which we

operate and financial trends that we believe may affect our business, financial condition, results of operations, and prospects, and these forward-looking
statements are not guarantees of future performance or development. These forward-looking statements speak only as of the date of this report and are subject
to a number of risks, uncertainties, and assumptions described in the section titled “Risk Factors” and elsewhere in this report. Because forward-looking
statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on these forward-looking
statements as predictions of future events. The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual
results could differ materially from those projected in the forward-looking statements. Except as required by applicable law, we do not plan to publicly update
or revise any forward-looking statements contained herein until after we distribute this Annual Report on Form 10-K, whether as a result of any new
information, future events, or otherwise.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based

upon information available to us as of the date of this report, and while we believe such information forms a reasonable basis for such statements, such
information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of,
all potentially available relevant information. These statements are inherently uncertain, and you are cautioned not to unduly rely upon these statements.

Investors and others should note that we may announce material business and financial information to our investors using our investor relations
website (https://investors.alector.com), Securities and Exchange Commission (SEC) filings, webcasts, press releases, and conference calls. We use these
mediums, including our website, to communicate with our members and public about our company, our products, and other issues. It is possible that the
information that we make available may be deemed to be material information. We therefore encourage investors and others interested in our company to
review the information that we make available on our website.

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Item 1. Business.

Overview

PART I

Our mission is to develop therapies that empower the immune system to cure neurodegeneration.

We are a clinical stage biopharmaceutical company pioneering immuno-neurology, a novel therapeutic approach for the treatment of

neurodegeneration. Immuno-neurology targets immune dysfunction as a root cause of multiple pathologies that are drivers of degenerative brain disorders.
We are developing therapies designed to simultaneously counteract these pathologies by restoring healthy immune function to the brain. Supporting our
scientific approach, our Discovery Platform enables us to advance a broad portfolio of product candidates, validated by human genetics, which we believe
will improve the probability of technical success over shorter development timelines. As a result, in the last five years, we have identified over forty immune
system targets, progressed over ten programs into preclinical research, and advanced two product candidates, AL001 and AL002, into clinical development.
In the first quarter of 2019, the dosing of the single ascending dose Phase 1a study in healthy subjects was completed for AL001, initially aimed at treating a
subset of frontotemporal dementia (FTD) patients who have a known genetic mutation that causes a deficiency in progranulin (PGRN), which is called FTD-
GRN. There were no drug-related serious adverse events or dose limiting adverse events reported in the study, achieving the primary endpoint. Moreover,
statistically significant increases in plasma and cerebrospinal fluid (CSF) PGRN levels relative to baseline were also observed, successfully demonstrating
proof-of-mechanism for AL001 in the central nervous systems of healthy subjects. We plan to advance AL001 into a Phase 1b study with proof-of-
mechanism data in FTD-GRN patients expected in the first half of 2019 and into a Phase 2 study with proof-of-concept data in FTD-GRN patients expected
in the first half of 2020. In the second half of 2018, we initiated dosing of healthy subjects in the ascending dose Phase 1a study for AL002, a product
candidate for Alzheimer’s disease. In addition, in the first half of 2019, we plan to initiate clinical trials with AL003, a product candidate for Alzheimer’s
disease, in an ascending dose Phase 1a study in healthy subjects. In the second half of 2019, we expect to initiate a Phase 1 study with AL101, a product
candidate for multiple neurodegenerative disorders.

Our Discovery Platform leverages large scale human genetic datasets, advanced tools in bioinformatics and imaging, and insights into

neurodegeneration and immunology to identify immune system targets that play a critical role in the development of multiple neurodegenerative diseases. Our
Discovery Platform focuses on:

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Target Selection. We identify mutations in genes that control the brain’s immune system, which we believe are the root cause of
neurodegeneration, employ a suite of genetic tools to elucidate the immune dysfunction caused by these mutations, and then engineer
immune modulating antibodies to counteract the harmful consequences of these genetic mutations.

Biomarker Selection. We are able to identify and employ molecular biomarkers, assays, and precise imaging techniques to confirm target
engagement and measure the effect of our product candidates, allowing us to potentially obtain clinical data earlier than would otherwise be
expected using traditional clinical measures.

Patient Selection. We utilize genetic screening and other biomarkers to better align a patient’s specific diagnosis with the targeted
intervention in each of our clinical studies.

Our immuno-neurology approach and our Discovery Platform are designed to broadly address multiple neurodegenerative disorders. The breadth of

our opportunity is reinforced by our ability to engineer therapeutics capable of modulating a broad array of immune targets, validated by human genetics,
across multiple mechanisms of action, including product candidates that activate, block, inhibit, or down-regulate a given target as therapeutically needed.
Our intellectual property portfolio covers over 25 patent families, consisting of one approved patent and over 100 pending patent applications directed to over
15 different targets and technologies.

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Figure 1. The below table highlights our preclinical and clinical programs.

Figure 2. The below table highlights ten of our identified programs in our research and development pipeline.

The above table reflects that we currently have seven neurology programs identified in our research and development pipeline focused on targeting

Alzheimer’s disease, Parkinson’s disease, ALS, and progressive multiple sclerosis. Moreover, we have three oncology programs identified in our research and
development pipeline focused on targeting innate immune cells. Currently, we estimate that all of these neurology and oncology focused programs are one to
three years or more away from entering preclinical studies assuming that these programs meet our requirements for advancement into the preclinical stage.
For each of our programs in our research and development pipeline we are working to identify biomarkers to be utilized in preclinical studies.

Our first program modulates PGRN, a regulator of immune activity in the brain with genetic links to multiple neurodegenerative disorders, including

FTD, Alzheimer’s disease, and Parkinson’s disease. AL001, our first PGRN product candidate in clinical development, is designed to treat FTD, a severe,
rapidly progressing neurodegenerative disorder that affects approximately 170,000 individuals in the United States and the European Union alone, with
potentially higher prevalence in Asia and Latin America. AL001 entered the clinic in the second half of 2018 aimed at treating FTD-GRN. AL001
successfully demonstrated proof-of-mechanism in a dose-escalating Phase 1a study in healthy subjects by showing a statistically significant increase in PGRN
levels relative to baseline when compared to pooled placebo in plasma and in CSF in measured cohorts at the pre-specified follow-up time point. We plan to
advance AL001 into a Phase 1b study with proof-of-mechanism data in FTD-GRN patients expected in the first half of 2019 and a Phase 2 study with proof-
of-concept data in FTD-GRN patients expected in the first half of 2020. We also intend to include an additional genetic subset of FTD patients (FTD-
C9orf72) in 2019. Following proof-of-concept data in FTD-GRN patients, we plan to expand to additional FTD subpopulations. We are also advancing a
second PGRN product candidate, AL101, which is expected to have utility in a broader set of indications, such as Alzheimer’s disease and Parkinson’s
disease. We own worldwide rights to AL001 and AL101.

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Our next development programs focus on modulating check-point receptors on the brain’s immune cells, Triggering Receptor Expressed on Myeloid
cells 2 (TREM2) and sialic acid binding Ig-like lectin 3 (SIGLEC 3), with strong genetic links to Alzheimer’s disease. In the second half of 2018, we initiated
dosing of healthy subjects in a dose escalation Phase 1a study in AL002, a product candidate for Alzheimer’s disease, and, in the first half of 2019, plan to
advance AL003, a product candidate for Alzheimer’s disease, into a dose escalation Phase 1a study in healthy subjects. We have partnered with AbbVie
Biotechnology, Ltd. (AbbVie), a leader in neuroscience drug development, for the global development and potential commercialization of AL002 and AL003.
We are responsible for execution of the Phase 1 and Phase 2 studies. Following AbbVie’s exercise of its option, we and AbbVie will share the development
costs and will split global profits after marketing approval. However, following AbbVie’s option exercise for a program, we may opt out of sharing in
development costs and profits or losses from that program and instead receive a tiered royalty on sales of products from that program. As part of this
partnership, we received $205.0 million in upfront payments, $20.0 million from the sale of shares of our preferred stock, and are eligible for up to an
additional $985.6 million in option exercise and milestone payments and a global profit share with AbbVie upon commercialization.

The Immune System is Central to Neurodegeneration

The loss of healthy immune function in the brain, due to cellular aging or mutations of genes that regulate key immune cells, underlies the onset and

progression of multiple neurodegenerative disorders. Genomic analyses have shown that there is a strong correlation between genetic mutations that
predispose individuals to neurodegeneration and dysfunction in the immune system. For example, 22 of the top 25 risk genes identified by evaluating large-
scale data on tens of thousands of Alzheimer’s disease patients regulate immune function in the brain. As a result of these genetic mutations, the brain’s
immune function deteriorates and subsequently would fail to carry out critical activities, which include:

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clearing or counteracting pathological neurodegenerative proteins such as amyloid-beta, TAU, alpha-synuclein, and TDP-43;

providing metabolic and functional support to nerve cells;

regulating synaptic connections;

protecting nerve cells by stimulating the regeneration of myelin sheaths around nerve fibers; and

controlling the neurotoxic activities of activated astrocytes and rogue microglia.

We believe that restoring the immune system’s ability to perform all of these vital functions in the brain is crucial to addressing neurodegeneration

given that past approaches focusing on single degenerative pathologies have proved inadequate to date.

Since the early 20th century, the root cause of neurodegeneration has been thought to be misfolded and aggregated pathological proteins. Other

observable pathologies, including destruction of synapses, accelerated nerve cell death, and dysfunction of the brain support cells, were all thought to be
consequences of these pathological misfolded proteins. As a result, attempts to develop therapies for neurodegeneration have been centered on blocking the
synthesis of, and removing or dis-aggregating misfolded proteins. These attempts have been largely unsuccessful, as the disease continues to progress despite
significant clearance of the misfolded protein. We believe that the multiple pathologies found in degenerative brain disorders become independent of the
misfolded proteins, and each other, at early disease stages and are driven primarily by dysfunction of the brain’s immune system.

Specifically, the brain’s immune system undergoes gradual deterioration of functional characteristics as part of normal biological aging or due to

harmful genetic mutations that are linked to neurodegeneration and are associated with accelerated senescence of the brain immune cells. These cells are no
longer capable of executing their beneficial and protective roles and instead often become harmful and destructive to the brain. Based on our understanding of
the role of genetic mutations in neurodegeneration, we have designed our product candidates to target the mutated genes linked to neurodegeneration, with the
goal of slowing or reversing the deterioration of the brain’s immune cells to achieve therapeutic benefit. By restoring healthy immune function in the brain,
we believe we can simultaneously counteract the multiple independent pathologies responsible for neurodegeneration.

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Our Strategy

Our goal is to develop therapies that empower the immune system to cure neurodegeneration. The key tenets of our business strategy to achieve this

goal include:

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Building the leading, fully-integrated company focused on delivering innovative immuno-therapies, validated by human genetics, for the
treatment of neurodegeneration. We believe that building a fully integrated company will allow us to more rapidly and efficiently develop
therapies for patients as well as create value for our stakeholders. We are focused on building an independent research, development, clinical,
and ultimately commercial organization in order to prosecute the full potential of our immuno-neurology approach and Discovery Platform.

Applying our proprietary development capabilities to rapidly advance our product candidates through clinical proof-of-concept studies
and beyond. We are focused on maximizing the probability of success of our product candidates by leveraging immunology, neurobiology,
and human genetics, as well as our state-of-the-art bioinformatics, to enable better and earlier target selection. In addition, we are also
focused on a biomarker-driven approach, including proprietary tools and assays, to confirm target engagement, inform patient selection, and
follow clinical outcomes.

Maximizing the therapeutic potential of our existing targets and product candidates. Given the central physiological roles played by the
distinct targets of our product candidates, we believe that there is significant potential for us to address multiple indications with single
targets. Our goal is to expand the therapeutic and commercial potential of our existing targets and product candidates to additional
indications. However, we will remain disciplined about advancing this strategy, leveraging our Discovery Platform capabilities to inform
expansion areas of maximum value and highest probability of success.

Continuing to focus on discovering new targets and product candidates, validated by human genetics, to prosecute the full power of our
insights and platform. Our Discovery Platform is central to our efforts to rapidly identify new product candidates with compelling clinical
promise. We will continue to invest in our Discovery Platform, including evolving our proprietary analytical tools and assays, to further
investigate several of our identified immune system targets as well as generate additional targets and product candidates.

Our Approach

The Role of the Innate Immune System and Microglia in Neurodegeneration

Significant evidence in the last decade has shown that neurodegenerative diseases, such as Alzheimer’s disease, Parkinson’s disease, FTD, and ALS,

are linked to a dysfunctional brain immune system. In contrast to the dual adaptive and innate components that characterize the broader human immune
system, the brain’s immune system consists primarily of innate immune cells, known as microglia. These brain resident macrophages account for 10% to 15%
of all cells found within the brain and are responsible for many aspects of brain health and maintenance. As the key innate immune cells in the brain,
microglia respond to infection and damage, clear cell debris and pathological proteins, nurture neurons and the brain support cells, and control the number
and functionality of inter-neuronal connections. Microglia have been our initial focus and new scientific advances have

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made it possible to understand how these key innate immune cells in the brain represent a crucial focal point for intervening, treating, or preventing
neurodegenerative diseases (Figure 3).

Figure 3. Our antibody product candidates target microglia to harness their many potential beneficial roles in treating neurodegenerative diseases.  

Significant Scientific Data Support Our Hypothesis

Understanding how the brain’s immune cells affect its structure and function, in both normal and diseased states, is in our view, the key to

understanding many neurological diseases. Human genetic evidence, especially in the last five years, has supported the importance of the interactions between
the brain and the innate immune system. For example, 22 of the top 25 risk genes for Alzheimer’s disease, identified using genetic linkage studies, candidate
gene analysis, genome-wide association (GWAS) studies, and whole-genome or whole-exome sequencing, regulate

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immune function in the brain. Many of these risk genes have been shown to express predominantly in microglia and to control the function of these cells
(Figure 4).

Figure 4. Expression of genes linked to Alzheimer’s disease is highly enriched in microglia.1 * Red box added to highlight microglia.

Microglia have been shown to be key cells in overall brain maintenance, health, and function and are the brain’s first line of immune defense. These

innate immune cells are tooled with “microglial sensomes” which enable them to constantly survey brain cells to identify and respond to subtle signs of
pathology or dysfunction. Microglia scavenge the brain for toxic misfolded proteins, cell debris, damaged or unnecessary nerve cells, dysfunctional or aged
synapses, and infectious agents. In addition, microglia support the generation of new neurons and synapses and remodel neuronal circuits. Microglia also
control the survival and function of astrocytes and oligodendrocytes, the main brain support cells which control brain metabolism and blood supply and
replenish aged or damaged nerve fibers after injury. Further, microglia have been shown to modulate the permeability of the blood brain barrier allowing
access to peripheral immune cells, to assist against infection or injury. Microglia can also change their morphology, functionality, and number in response to
changing brain environment.

Recent analysis of gene transcription at the single-cell level in microglia from normal and diseased brains revealed that multiple microglia subtypes

exist which may respond to specific disease pathologies in the brain. Our product candidates are designed to recruit microglia subtypes by targeting microglia
check-point proteins that control their survival, proliferation, migration, and function. This allows us to differentially modulate microglia activity as needed to
counteract a given degenerative brain disorder.

Recent findings in the fields of human genetics, immunology, and neuroscience have indicated that as a result of normal aging or genetic mutations,

the beneficial functions of the microglia deteriorate leading to massive death of neurons and consequently to neurodegeneration.

1  Hansen, D., Hanson, J., Sheng, M. “Microglia in Alzheimer’s disease.” Journal of Cell Biology. Volume 217, Number 2, February 2018.

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The following table outlines the key impact of functional and dysfunctional microglia:

Functional Microglia

Dysfunctional Microglia

•Clear/counteract and form a barrier around pathological proteins

such as amyloid-beta

•Provide metabolic and functional support to nerve cells

•Regulate healthy synaptic connections

•Control the function of astrocytes, the brain’s star shaped

support cells that help maintain the blood-brain barrier,
provide nutrients to neurons, repair the nerve tissue
following injury, and facilitate neurotransmission

•Reduced ability to remove, or to limit the damage
caused by pathological proteins leading to
dysfunction of neuronal connections and
ultimately leading to neuronal cell death

•Reduced ability to provide nourishing factors to
neurons leading to neuronal cell death

•Indiscriminate destruction of synapses leading to

reduced number of synapses and dysfunctional
neuronal connections

•Inducement and conversion of beneficial astrocytes
to toxic astrocytes leading to neuronal cell death

•Control the survival and function of oligodendrocytes that
provide protective myelin sheaths around nerve fibers

•Failure to support oligodendrocytes, leading to

neuronal dysfunction

Our Discovery Platform

Our Discovery Platform leverages human genetic datasets, advanced tools in bioinformatics and imaging, and insights in neurodegeneration and

immunology to: (1) identify immune system targets that play a critical role in the development of multiple neurodegenerative diseases, and rapidly develop
antibody therapeutics to these targets, (2) interrogate and prioritize those targets for activity using biomarkers and related proprietary assays and preclinical
models, and (3) clinically test product candidates in genetically defined patient populations that are most likely to respond to treatment. We believe that these
platform capabilities provide us with the tools to solve the conceptual and technical challenges associated with development of drug candidates for
neurodegeneration.

We rely on proprietary immuno-neurology bioinformatics algorithms and methodologies to analyze large genetic datasets from diseased and healthy
individuals, brain-based gene expression profiling, brain-based proteomics, and human pathology. These proprietary capabilities allow us to rapidly identify
tractable targets, pharmacodynamic biomarkers, and patient populations associated with aberrant immune function which lead to neurodegeneration.
Specifically, the three priorities of our platform efforts are:

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Target Selection. Our target selection capabilities address a wide array of factors that we believe inform efficient, optimized therapeutic
outcomes, including genetic and mechanistic rationale. We leverage our state-of-the-art bioinformatics to identify genetic mutations in the
brain immune system that we believe are the root cause of neurodegeneration. We employ a suite of genetic tools to elucidate the immune
dysfunction caused by these mutations. We then seek to engineer immune modulating antibody product candidates to functionally counteract
the harmful consequence of these genetic mutations. We leverage in vitro and in vivo functional tools to validate the activity of our product

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candidates and their ability to cross the blood brain barrier at sufficient quantities to be therapeutically effective.

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Biomarker Selection. We are able to identify and employ molecular biomarkers, assays, and imaging techniques that are tailored to our
product candidates to confirm target engagement and quantify their therapeutic impact, allowing us to potentially obtain clinical data earlier
than would be expected using traditional clinical measures.

Patient Selection. We utilize genetic screening and biomarkers to better align a patient’s specific diagnosis with the targeted intervention in
each of our clinical studies.

We employ gene expression profiling, proteomics, brain imaging, and data on disease pathology as well as our own preclinical and clinical data to
continually refine our proprietary immuno-neurology algorithms and methodologies. Using our Discovery Platform to identify targets that are validated by
human genetics, disease biomarkers, and responsive patient populations, we believe that we are positioned for greater probability of technical success on
more efficient timelines relative to historical drug development in neurodegeneration.

In the last five years, we have identified over forty immune system targets through genetic analysis and efficiently advanced more than ten programs
to preclinical research. In the second half of 2018, AL001, initially aimed at treating FTD-GRN patients, successfully demonstrated proof-of-mechanism in a
dose-escalating Phase 1a study in healthy subjects by showing a statistically significant increase in PGRN levels relative to baseline when compared to pooled
placebo in plasma and in CSF in measured cohorts at the pre-specified follow-up time point. In the first quarter of 2019, the dosing of the single ascending
dose Phase 1a study in healthy subjects was completed for AL001. We plan to advance AL001 into a Phase 1b study with proof-of-mechanism data in FTD-
GRN patients expected in the first half of 2019 and a Phase 2 study with proof-of-concept data in FTD-GRN patients expected in the first half of 2020. In the
second half of 2018, we initiated dosing of healthy subjects in the ascending dose Phase 1a study for AL002, a product candidate for Alzheimer’s disease. In
addition, in the first half of 2019, we plan to initiate clinical trials with AL003, a product candidate for Alzheimer’s disease, in an ascending dose Phase 1a
study in healthy subjects. In the second half of 2019, we expect to initiate a Phase 1 study with AL101, a product candidate for multiple neurodegenerative
disorders.

Our Pipeline Programs

Our Progranulin Program

Our first development program is focused on modulating levels of PGRN, a key regulator of microglia function in the brain with strong genetic links

to FTD and other neurodegenerative disorders. Healthy individuals carry two copies of PGRN that function together to produce healthy levels of PGRN
throughout the body. Mutations in both copies of the PGRN gene lead to a neurodegenerative disease called neuronal ceroid lipofuscinosis, which is typified
by childhood dementia, vision loss, and epilepsy. Mutations in a single copy of PGRN lead to a drop of between 50% and 70% in the level of PGRN and
consequently lead to development of FTD with greater than 90% probability. Moreover, large scale human genetic studies have shown that mutations in the
gene for PGRN, which leads to a more modest decrease in the level of PGRN, increases the risk for Alzheimer’s disease and Parkinson’s disease, making
PGRN a significant risk gene for these disorders as well.

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Healthy levels of PGRN are associated with many cellular processes that include, but are not limited to, normal microglial activities, neuronal
survival, and lysosome function. As shown in the figure below (Figure 5), PGRN deficiency disrupts microglia-neuronal homeostasis in the brain and
promotes neurodegeneration through the release of cytotoxic cytokines and complement factors by dysfunctional microglia. Moreover, these microglia
activate astrocytes, which in turn, damage neurons. Thus, lack of PGRN leads to disrupted health and function of both neurons and microglia and if not
corrected, rapid neurodegeneration.

Figure 5. PGRN deficiency disrupts homeostasis between microglia and neurons, and promotes neurodegeneration during aging.1

SORT1 Controls PGRN Levels in the Body

Human and mouse genetic studies have identified the neurotrophic factor PGRN degrading receptor Sortilin (SORT1) as a major negative regulator
of PGRN levels in plasma and the brain. SORT1 is a sorting receptor on the cell surface and on the endoplasmic reticulum-Golgi apparatus within the cell.
SORT1 binds to extracellular PGRN in the plasma and brain and transports it into the cells for degradation by the lysosome resulting in decreasing levels of
extracellular PGRN. SORT1 deficiency increases PGRN plasma and brain levels by two to three-fold in mouse models, while variants that modestly reduce
expression of SORT1 increase the level of PGRN in humans.

Moreover, genetic loss of SORT1 in mice does not lead to the adverse effects associated with genetic loss of PGRN, and PGRN continue to function
as expected in the absence of SORT1. These studies and others have indicated to us that blocking SORT1 with a pharmacological agent would be a safe and
effective approach in increasing the level of functional PGRN in the brain.

1  Kao, A., McKay, A., Singh, P., Brunet, A., Huang, E. “Progranulin, lysosomal regulation and neurodegenerative disease.” Nature Reviews Neuroscience. Volume 18, Number 6, June 2017.

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We have developed two distinct product candidates that target SORT1, AL001 and AL101, designed to increase PGRN levels in the brain of patients
to counteract the damage sustained due to low PGRN levels in neurodegenerative disorders. Our first product candidate, AL001, is initially intended to target
orphan disorders, including genetic forms of FTD such as in patients that are missing a functional copy of the PGRN gene (FTD-GRN). Our second PGRN
product candidate, AL101, is intended to target widely prevalent neurodegenerative disorders such as Alzheimer’s disease and Parkinson’s disease. We have
worldwide development and commercial rights to our PGRN product candidates.

AL001 for the Treatment of FTD

Our first product candidate, AL001, is a humanized recombinant monoclonal antibody that is intended to be delivered by intravenous, peripheral

infusion to the blood stream to increase the levels of PGRN in the brains of FTD-GRN patients. AL001 functions by shutting down the SORT1 degradation
mechanism for PGRN and increasing the circulating half-life of the functional PGRN in the brain. AL001 received orphan drug designation from the U.S.
Food and Drug Administration (FDA) for the treatment of FTD in 2018. Generally, if a product with an orphan drug designation subsequently receives the
first marketing approval for the indication for which it has such designation, the product is entitled to a period of market exclusivity. This exclusivity
precludes the FDA from approving another marketing application for the same indication for that time period, unless the later product is clinically superior.
Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

Overview of FTD

FTD is a rapidly progressing and severe degenerative brain disease with no approved treatment. FTD is a form of dementia found most frequently in

individuals less than 65 years old at time of diagnosis. Patients with FTD exhibit a range of symptoms including personality changes including compulsive
behavior, lack of restraint, apathy, and anxiety as well as language and behavioral problems. Average life expectancy in FTD patients is seven to 10 years
after the start of symptoms. FTD symptoms have an insidious onset with clinical symptoms usually appearing between 45 to 65 years of age at an average age
of 58. Hence, FTD is considered an early-onset dementia as compared to late-onset Alzheimer’s disease, and is more common than Alzheimer’s disease in
early-onset dementia under the age of 60 years.

Although FTD was poorly understood and thought to be rare, over the past decade the scientific community has gained a knowledge about the
biology of FTD as well as an awareness of disease prevalence. FTD affects 50,000 to 60,000 individuals in the United States and roughly 110,000 individuals
in the European Union. There are multiple heritable forms of FTD, such as FTD-GRN, which represent 5% to 10% of all patients with FTD, and
approximately 22% of heritable FTD cases. Healthy individuals carry two copies of PGRN that function together to produce sufficient levels of PGRN
throughout the body. Mutations in a single copy of PGRN lead to a 50% or greater decrease in the level of PGRN and lead to development of FTD with a
greater than 90% probability. Researchers have identified over 70 inherited loss of function mutations in PGRN that lead to FTD to date.

The rate of disease progression in FTD is faster than in Alzheimer’s disease, suggesting that clinical trials with disease-modifying agents have the

potential to obtain clinical data more quickly and with fewer subjects in FTD than in Alzheimer’s disease. For example, the median survival from symptom
onset in FTD is shorter than in Alzheimer’s disease.

We believe that we can establish rapid clinical proof-of-concept in FTD-GRN patients given its genetically-defined patient population, fast rate of

disease progression, and our ability to leverage fluid and imaging biomarkers. In FTD-GRN patients, inhibition of SORT1 through AL001 represents a
potential mechanism to compensate for the over 50% reduction of PGRN. AL001 is intended to reduce the ability of SORT1 to bind to and degrade PGRN,
leading to increases in the levels of PGRN through increasing its circulating half-life (Figure 6). We have tested our

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PGRN program antibodies in various animal models, including mice, rats, and non-human primates and have achieved significantly elevated, long-lasting
levels of PGRN in the brain after intravenous administration.

Figure 6. Mechanism of action for our PGRN programs. AL001 binds to SORT1 and prevents degradation of PGRN, increasing its circulating half-
life significantly. A similar mechanism of action is also applicable for AL101.

AL101 for the Treatment of Alzheimer’s Disease and Parkinson’s Disease

We are developing a second product candidate in our PGRN program, AL101, that targets SORT1 for large patient populations such as Alzheimer’s

disease and Parkinson’s disease.

Mutations that moderately reduce the amount of PGRN in the brain increase the risk for Alzheimer’s disease and Parkinson’s disease. Moreover,

some Parkinson’s disease patients have been shown to have reduced levels of PGRN. In line with our therapeutic hypothesis, we decided to target PGRN as a
potential disease modifying therapeutic for patients suffering from Alzheimer’s disease or Parkinson’s disease once we achieve proof-of-concept in FTD
patients.

Overview of Alzheimer’s Disease

Alzheimer’s disease is a chronic neurodegenerative disease that usually starts slowly in people over 65 years of age and worsens over time. It is the

most common cause of dementia, accounting for 60% to 70% of all cases. The most common early symptom of Alzheimer’s disease is difficulty in
remembering recent events. As the disease advances, symptoms can include problems with language, disorientation, mood swings, loss of motivation, failure
to manage self-care, and behavioral issues. As a person’s condition declines, they often withdraw from family and society. Gradually, bodily functions are
lost, leading to death. Although the speed of progression can vary, the typical life expectancy following diagnosis is eight to ten years.

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While estimates of the prevalence of Alzheimer’s disease vary, the Alzheimer’s Association estimates that, in 2018, there are 5.7 million people in the

United States suffering from Alzheimer’s disease and that number is projected to rise to nearly 14 million by 2050. Alzheimer’s disease is the sixth leading
cause of death in the United States.

In addition to its debilitating effect on patients’ cognition and day-to-day functioning, Alzheimer’s disease places a significant burden on the

healthcare system. According to the Alzheimer’s Association, the aggregate cost of care in 2018 for patients with Alzheimer’s disease and other types of
dementia in the United States was estimated to be $232 billion, over half of which is borne by the Medicare system.

Overview of Parkinson’s Disease

Parkinson’s disease is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. Early in the disease, the

most obvious symptoms are shaking, rigidity, slowness of movement, and difficulty with walking. Cognitive and behavioral problems may also occur.
Dementia becomes common in the advanced stages of the disease. Depression and anxiety are also common, occurring in more than a third of people with
Parkinson’s disease. Other symptoms include sensory, sleep, and emotional problems. Parkinson’s disease typically occurs in people over the age of 60. The
average life expectancy following diagnosis is between three to 10 years after the onset of symptoms.

There is no disease modifying treatment for Parkinson’s disease, and the options for patients are limited to treatments that improve symptoms. Initial

treatment is typically with the anti-Parkinson’s drug medication levodopa, with dopamine agonists being used once levodopa becomes less effective. As the
disease progresses and neurons continue to be lost, these medications become less effective while at the same time they produce a complication marked by
involuntary writhing movements.

According to the Parkinson’s Foundation, more than 10 million people worldwide are living with Parkinson’s disease. An estimated 930,000 people

in the United States will be living with Parkinson’s disease by the year 2020. This number is predicted to rise to 1.2 million by 2030.

Our PGRN Preclinical Data

We have conducted safety and efficacy studies of AL001 in non-human primates, also referred to as NHPs, and completed preclinical chronic good
laboratory practice (GLP) toxicology testing through 13 weeks with no test article related adverse findings. In non-human primates, AL001 recognizes and
binds to SORT1 with potency similar to that seen in the binding between AL001 and human SORT1. In these non-human primate experiments, AL001
delivered by intravenous injection to the blood stream blocked SORT1 and increased levels of PGRN in both plasma and the CSF (Figure 7). These
experiments indicated that there were therapeutic levels of AL001 in the brain

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following delivery to the bloodstream systemically. These effects were observed after a single dose of AL001 as well as during and after multiple dosing.

Figure 7. AL001 blocks SORT1 and increases the levels of PGRN in plasma and the cerebrospinal fluid in NHP following injection to the
bloodstream, indicating that peripherally injected AL001 elicits the desired biological response in the brain (n=4) (* indicates p<0.05 and **
indicates p<0.01 by T-test).

AL101 is able to cross-react and bind to murine, rat, non-human primate as well as human SORT1. AL101 binds SORT1 with similar potency in

multiple animal models. Following injection, AL101 was shown to block SORT1 and increase the levels of PGRN in the plasma and cerebrospinal fluid of
mice (Figure 8), rats, and non-human primates, demonstrating again that administration of AL101 is effective in increasing PGRN levels in the brain in
multiple animal models.

Figure 8. AL101 blocks SORT1 and increases the levels of PGRN in the plasma and cerebrospinal fluid in normal mice following intraperitoneal
injection, indicating that peripherally injected AL101 elicits the desired biological response in the brain (* indicates p<0.05 and *** indicates
p<0.001 by T-test).

In addition, we have conducted preclinical tests with AL101 in a mouse model created by introducing a mutation in one of the two copies for the

mouse version of PGRN (FTD-GRN mice). AL101 blocked SORT1 and increased levels of PGRN in both the plasma and CSF of the FTD-GRN mice
(Figure 9). These changes support the

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hypothesis that targeting SORT1 by administration of anti-SORT1 antibodies would lead to an increase of PGRN in the brains of FTD-GRN patients.

Figure 9. AL101 blocks SORT1 and increases the levels of PGRN in the plasma and CSF in FTD-GRN mice following intraperitoneal injection,
indicating that peripherally injected AL101 elicits the desired biological response in the brain (* indicates p<0.05 and *** indicates p<0.001 by T-
test).

The FTD-GRN mice also exhibit behavioral changes such as an increase in submissiveness and social aversion. This can be assessed in a social

aversion test in which mice are introduced at opposite ends of a tube. Normal mice will approach each other in the tube until one of them retreats on average
50% of the time. When an FTD-GRN mouse is placed into the tube together with a normal mouse, it is about three times more likely to retreat first.

We tested our hypothesis that increasing levels of PGRN, through inhibition of SORT1, would slow disease progression and lead to a beneficial
therapeutic effect in the FTD-GRN mouse model. In this experiment, administration of the FTD-GRN mice with AL101 for four weeks increased PGRN
levels in the brains of FTD-GRN mice and significantly reduced the social deficit symptoms of FTD and restored healthy behavior in this social aversion test.
Moreover, no adverse effects were observed in either FTD-GRN mouse model or normal mice after the treatment with AL101.

Our PGRN Product Candidates Development Plan

Our PGRN product candidates have demonstrated target engagement, increases in the disease associated pharmacodynamic marker PGRN in the

brains of mice, rats, non-human primates, and healthy volunteers, and reduction of social deficit symptoms of FTD in a social aversion test using FTD-GRN
mice following intravenous injection. Our strategy is to first advance AL001 in fast progressing orphan indications with the highest unmet need and strongest
evidence of causal connection, treating genetically defined patient populations to generate proof-of-concept data. We then intend to advance AL101 for more
common neurodegenerative diseases such as Alzheimer’s disease and Parkinson’s disease.

In the first quarter of 2019, the dosing of the single ascending dose Phase 1a study in healthy subjects was completed for AL001. AL001 successfully

demonstrated proof-of-mechanism in a dose-escalating Phase 1a study in healthy volunteers by showing a statistically significant increase in PGRN levels
relative to baseline when compared to pooled placebo in plasma and in CSF at the pre-specified follow-up time point. We plan to advance AL001 into a Phase
1b study with proof-of-mechanism data in FTD-GRN patients expected in the first half of 2019 and into a Phase 2 study with proof-of-concept data expected
in the first half of 2020 (Figure 10). We also plan to include an additional genetic subset of FTD patients (FTD-C9orf72) in 2019. Following proof-of-concept
data in FTD-GRN, we plan to expand to additional FTD subpopulations.

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Figure 10. Clinical plan for AL001 in FTD-GRN.

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Our PGRN Proof-of-Mechanism Data in Healthy Volunteers

AL001 was dosed in a randomized, double-blind, placebo-controlled, dose-escalating Phase 1a study in the United States with healthy volunteers

being randomized and receiving a single dose of AL001 or placebo. Each of the dose levels consisted of a cohort of eight healthy volunteers, with six
receiving AL001 and two receiving placebo, representing a six to two randomization ratio of AL001 to placebo. The primary endpoints of the study are safety
and tolerability. The secondary endpoints include pharmacokinetic and pharmacodynamic measurements, including changes of PGRN in serum and the CSF.
Pharmacodynamic characteristics include the biochemical and physiological effects of a product candidate, and pharmacokinetic characteristics describe the
time course, for example, product candidate absorption, distribution, metabolism, and excretion.

The subjects were dosed in five cohorts in escalating dose levels of AL001, and data for plasma PGRN levels of the cohorts and CSF PGRN levels of

the three highest dose cohorts are available. Additional subjects are being enrolled at a previous dose level to further assess pharmacodynamic effects of
AL001. While the study is still blinded to the individual subjects’ treatment assignments, pooled analysis of active versus placebo subjects was conducted to
assess potential pharmacodynamic effects of AL001. There were no drug-related serious adverse events or dose limiting adverse events reported in the study,
achieving the primary endpoint. Moreover, statistically significant increases in plasma and CSF PGRN levels relative to baseline were also observed,
successfully demonstrating proof-of-mechanism for AL001. The magnitude and duration of the effect in plasma and CSF PGRN levels appeared to be dose
dependent. Results in this dose-escalating Phase 1a study in healthy subjects successfully demonstrate proof-of-mechanism for AL001 in both plasma and
CSF.

Figure 11. AL001 increases the level of PGRN in cerebral spinal fluid in healthy volunteers in measured cohorts at the pre-specified follow-up time
point (the thirteenth day following injection) compared to pooled placebo in CSF (**** indicates p<0.0001 by T-test).

We plan to have Phase 2 trial proof-of-concept data in FTD-GRN patients in the first half of 2020 and expect to include multiple CSF biomarkers,

multiple types of brain imaging (Figure 12), and multiple cognitive and behavioral tests.

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Figure 12. Decreasing clinical risk with volumetric brain imaging. The change in brain volume loss was driven by symptomatic mutation carriers.2,3

Potential Additional Applications for Our PGRN Program

Our initial PGRN program is currently targeted only at patients with FTD-GRN, which is a subset of the total FTD patient population. Beyond FTD-

GRN, we believe AL001 has the potential to treat other rare diseases that share pathological mechanisms with FTD-GRN. In order to treat any other rare
diseases and the broader FTD patient population, we will be required to conduct additional clinical studies in order to obtain the applicable approvals for that
specific patient population. We also plan to include an additional genetic subset of FTD patients (FTD-C9orf72) in 2019. Following proof-of-concept data in
FTD-GRN, we intend to expand to additional FTD subpopulations.

2  Boeve, B., Baker, M., Dickson, D., Parisi, J., Giannini, C., et al. “Frontotemporal dementia and parkinsonism associated with the IVS1+1G->A mutation in progranulin: a clinicopathologic study.”

Brain: a Journal of Neurology. Volume 129, Issue 11, November 2006.

3  Sha, S., Miller, Z., Min, S., Zhou, Y., Brown, J., et al. “An 8-week, open-label, dose-finding study of nimodipine for the treatment of progranulin insufficiency from GRN gene mutations.”

Alzheimer’s & Dementia: Translational Research & Clinical Interventions. Volume 3, Issue 4, November 2017.

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In addition, polymorphic mutations that moderately reduce the expression levels of PGRN have also been shown to increase the risk of developing

Alzheimer’s disease and Parkinson’s disease, and increased PGRN levels have been demonstrated to be protective for these diseases in animal models. We are
developing AL101 ultimately to target these large chronic neurodegenerative diseases (Figure 13). For our other programs, we anticipate following a similar
development approach to expand into additional patient populations as appropriate.

Figure 13. Our PGRN programs have broad therapeutic potential, including FTD and other more prevalent neurodegenerative diseases such as
Parkinson’s disease and Alzheimer’s disease. (Figure not to scale.)

Our TREM2 Program

TREM2 is a transmembrane receptor protein that is expressed on a subset of innate immune cells and selectively on microglia in the brain. TREM2

on microglia cells is thought to promote improved cell migration to the site of injury, improved cell survival, increased phagocytosis, and increased cell
proliferation. Rare individuals with homozygous TREM2 mutations, or mutations on both chromosomal copies, may develop neurodegeneration by the age of
40 with an average lifespan of 10 years following diagnosis. A gene variant in one of the two copies of TREM2 is found to increase the risk of Alzheimer’s
disease by threefold. Not only do mutations in a single copy of TREM2 increase the risk of Alzheimer’s disease significantly, but Alzheimer’s disease
patients with TREM2 mutations exhibit an earlier onset of symptoms by three years and an increased rate of brain volume loss compared to individuals
without such mutation. Evidence also suggests that gain of function mutation leading to increased extension of TREM2 confer a protective phenotype against
Alzheimer’s disease.

The discovery of strong genetic linkage of TREM2 to Alzheimer’s disease in 2013 was one of the first examples in which large scale genomic

analyses were used to identify a rare gene variation and link it to an increase in the risk of late-onset Alzheimer’s disease.

TREM2 binds to membrane lipids and lipoproteins such as Apolipoprotein E (ApoE) which are normally found in the brain. Mutations in the gene for

ApoE are also known to significantly increase the risk of development of Alzheimer’s disease and is the single highest risk factor for Alzheimer’s disease.

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AL002 for the Treatment of Alzheimer’s Disease

Our product candidate, AL002, is a humanized, TREM2 activating, monoclonal antibody that is intended to be delivered by intravenous, peripheral
infusion into the blood stream (Figure 14). AL002 is a microglia cell regulator that modulates the TREM2 receptor and is being developed for the treatment
of Alzheimer’s disease in collaboration with AbbVie.

Figure 14. Mechanism of action of our TREM2 activating product candidate AL002.

There are currently no cures or disease-modifying therapies for Alzheimer’s disease and there are only two classes of approved therapies for
symptomatic treatment: acetylcholinesterase inhibitors and glutamatergic modulators. These drugs are designed to help preserve neuronal communication, but
only provide temporary benefit and do not slow or halt neuronal death. In addition, antidepressants and antipsychotics are often prescribed off-label to treat
the symptoms of severe Alzheimer’s disease in patients suffering from agitation, aggressive behaviors, psychosis, and depression.

Recent drug candidates under development for Alzheimer’s disease include those focused on blocking synthesis, enhancing clearance or

disaggregating misfolded amyloid-beta or TAU proteins in the brain, reversing chronic inflammation, and repairing vascular dysfunction, metabolic
dysregulation, as well as neurotoxicity. Almost all of these candidates were designed to target just one of the multiple Alzheimer’s disease pathologies, and
most of these drug candidates have so far failed to demonstrate any significant benefit.

Although amyloid-beta plaques and TAU protein in the brain represent physical pathologies of the disease and are believed to cause a loss of
neuronal connectivity in the brain and neuronal death, recent scientific data paints a more complex picture. Therapeutic approaches that address only one of
the multiple pathologies observed in Alzheimer’s disease, for example, pathology-directed therapies that clear amyloid-beta or TAU proteins, have had
limited efficacy. More efficacious therapies will require addressing additional pathologies which we believe are associated with microglial failure.

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Our TREM2 Preclinical Data

AL002 binds to TREM2 on the surface of microglia and is designed to optimize microglial activity through the phosphorylation of Spleen Associated

Tyrosine Kinase (Syk). We have demonstrated that AL002s, an antibody that is functionally similar to AL002 but cross-reacts to the mouse TREM2, can
normalize gene expression signature associated with Alzheimer’s disease, induce microglial proliferation, increase microglial survival, increase the number of
microglia surrounding amyloid-beta plaques, and increase the compaction, insulation, and phagocytosis of these pathological proteins (Figure 15). Moreover,
AL002s following intraperitoneal injection increases migration of microglia to sites of neurodegenerative damage, and restores cognitive ability in animal
models (Figure 16).

Figure 15. AL002s statistically significantly increases the number of microglia around amyloid-beta plaques (left) and reduces the area occupied by
amyloid-beta plaques (right) in a mouse model of Alzheimer’s disease (**** indicates p<0.0001 by T-test).

Figure 16. AL002s statistically significantly improves cognitive deficit in a mouse model of Alzheimer’s disease (**** indicates p<0.0001 by T-test).

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AL002 Development Strategy

Figure 17. Clinical plan for AL002 in Alzheimer’s disease.

AL002 is being administered in a randomized, double-blind, placebo-controlled, dose-escalating Phase 1a study in healthy subjects in Australia. In

the Phase 1b, 12 Alzheimer’s disease patients will be randomized and receive four doses of AL002 or placebo. The primary endpoints of the study are safety
and tolerability. The secondary endpoints include pharmacokinetic measurements, including serum and CSF concentrations of AL002 at specific time points.
No drug-related serious adverse events or dose-limiting adverse events have been reported.

In addition to safety in healthy adults as well as Alzheimer’s disease patients, CSF levels of target engagement and signaling biomarkers, which were

validated in non-human primates after AL002 systemic administration, will be used along with biomarkers associated with immune activity in the brain to
determine optimal dosing regimen and evaluate proof-of-mechanism in healthy volunteers and Alzheimer’s disease patients and safety of AL002 (Figure 17).

Following the Phase 1 study, we intend to launch a double-blind placebo-controlled Phase 2 proof-of-concept trial in Alzheimer’s disease patients in
early stages of the disease. In addition to measuring molecular and genetic biomarkers, we intend to use novel imaging modalities to specifically look at the
levels of activated microglia in the brain. Moreover, imaging techniques focused on pathological proteins and neuronal health will also be employed for an
early read-out on various molecular and genetic biomarkers, imaging assessments and clinical measures to establish proof-of-concept enabling pivotal
Phase 3 studies.

These clinical trials have been designed in close collaboration with AbbVie. Our desired outcome is to achieve informative endpoints to enable

efficient Phase 3 clinical trial design and a rapid advancement towards marketing approval. For more information on our collaboration with AbbVie see the
section titled “Business—Strategic Alliance with AbbVie.”

Our SIGLEC 3 Program

Large scale genomic profiling of datasets from Alzheimer’s disease patients has been used to identify the association between certain variants of

SIGLEC 3, also known as CD33, and increased risk to develop Alzheimer’s disease. SIGLEC 3 is an inhibitory receptor expressed on microglia and acts as
the brakes of the immune system in the brain, slowing down microglial activity. Excessive inhibition of the microglia by the disease risk variant of
SIGLEC 3, which increases expression of the inhibitory SIGLEC 3 receptor on microglia, leads to reduced functionality of the myeloid cells, and
consequently, increased deposition of amyloid-beta plaques, and accelerated loss of tissue in the brain of Alzheimer’s disease patients that carry this risk
variant.

Our analysis further showed that the natural inhibitory ligands for SIGLEC 3, which are required for activation of SIGLEC 3, are upregulated in the

brain of Alzheimer’s disease patients, further reducing the functionality of the microglia.

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Consistent with the genetic findings in humans, Alzheimer’s disease mouse models, in which the gene for SIGLEC 3 was genetically ablated, have

microglia with improved phagocytosis of beta amyloid and displayed fewer amyloid-beta plaques compared to the same Alzheimer’s disease model that
expressed the mouse SIGLEC 3 gene. In line with the findings that the presence of SIGLEC 3 increased the severity of Alzheimer’s disease, a reduced
number of certain disease associated microglia that are thought to counteract the progression of Alzheimer’s disease was observed when the human
SIGLEC 3 in Alzheimer’s disease mouse models was over-expressed.

Taken together, this data supports the hypothesis that blocking the function of SIGLEC 3 would increase the number of beneficial microglia and elicit

a therapeutic benefit in Alzheimer’s disease.

AL003 for Treatment of Alzheimer’s Disease

Our product candidate, AL003, is a SIGLEC 3 blocking, monoclonal antibody (Figure 18) that is intended to be delivered by intravenous, peripheral
infusion into the blood stream. The function of SIGLEC 3 on microglia is similar to the inhibitory function of PD-1 on T-cells. AL003 acts similarly to PD-1
inhibitors that have been employed successfully in immunotherapy of cancer. Both approaches aim to remove the “brakes” on the immune system to allow the
system to work at its full capacity.

Figure 18. Mechanism of action of our SIGLEC 3 blocking product candidate AL003.

In the first half of 2019, we plan to initiate clinical trials with AL003, a product for Alzheimer’s disease, in an ascending dose Phase 1a study in

healthy subjects to assess preliminary safety of AL003. Proof-of-mechanism data can be obtained by analysis of levels of fluid biomarkers. Following
positive results in this trial, we intend to launch a Phase 2 proof-of-concept trial for AL003 in Alzheimer’s disease patients.

Our SIGLEC 3 Preclinical Data

The activity of AL003 in mice was assessed in immunodeficient mice containing human immune cells to recapitulate the human immune system as

closely as possible. AL003 injected into the bloodstream of these mice

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blocks SIGLEC 3 on immune cells. In addition, a single intraperitoneal injection of AL003 into mice that express the human SIGLEC 3 in microglia leads to
a long lasting, statistically significant blockade of SIGLEC 3 on the cell surface of microglia in the brain, indicating that AL003 is able to cross the blood
brain barrier and exert its desired activity (Figure 19).

Figure 19. AL003 blocks SIGLEC 3 on microglia in mouse brain following injection to the blood stream (**** indicates p<0.0001 by T-test).

AL003 Development Strategy

Figure 20. Clinical plan for AL003 in Alzheimer’s disease.

Our AL003 product candidate follows a similar clinical development plan to AL002 with some modifications. In the first half of 2019, we plan to
initiate a Phase 1a study of AL003 in healthy subjects in Australia. In the Phase 1b study for AL003, Alzheimer’s disease patients will be randomized and
receive AL003 or placebo. This Phase 1 trial is designed to establish safety of AL003 in healthy subjects as well as Alzheimer’s patients.

Following positive results in this trial, we intend to launch a double-blind placebo-controlled Phase 2 proof-of-concept trial in Alzheimer’s disease

patients (Figure 20).

During this planned Phase 2 trial, in addition to measuring molecular and genetic biomarkers, we intend to use novel imaging modalities to measure
the levels of immune activity in the brain. Moreover, imaging techniques focused on pathological proteins and neuronal health will also be employed for an
early read out on various

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molecular and genetic biomarkers, imaging assessments and clinical measures to establish proof-of-concept enabling pivotal Phase 3 studies.

These clinical trials have been designed in close collaboration with AbbVie. Our desired outcome is to achieve informative endpoints to enable

efficient Phase 3 clinical trial design and a rapid advancement towards marketing approval. For more information on our collaboration with AbbVie see the
section titled “Business—Strategic Alliance with AbbVie.”

Expansion of Our Discovery Platform to Other Indications

Immuno-oncology

Microglia display similar gene expression signature and function to the innate cells of the peripheral immune system. These peripheral innate cells

such as macrophages, NK cells and others, likely play a significant role in multiple chronic diseases including cancer, inflammation, and autoimmune
disorders. We are leveraging our expertise in innate immune system to develop additional innate immune check-point focused programs, including programs
targeting the Siglec protein family and the SIRP protein family, for peripheral disorders, particularly cancer. We believe that products focused on
innate immune biology will complement and expand the efficacy of current immuno-oncology drugs that target the adaptive immune system.

Combination Therapies

Our therapies are also likely to act in conjunction with each other or with other experimental drugs that are designed to remove pathological

proteins. Therapies such as antibodies against amyloid-beta, the TAU filaments or misfolded alpha-synuclein protein are designed to tag the pathological
proteins and recruit microglia to dispose of the drug pathological protein complex. Aging microglia are less likely to perform this function effectively and
our immuno-neurology therapies could ameliorate this deficiency. We are continuing to explore various combination strategies in preclinical models and will,
in the future, consider moving this strategy into the clinic based upon results from preclinical models.

Strategic Alliance with AbbVie

Overview

In October 2017, we entered into the Co-Development and Option Agreement with AbbVie (AbbVie Agreement). The primary goal of our global

strategic collaboration with AbbVie is to co-develop and commercialize therapeutics to treat Alzheimer’s and other neurodegenerative diseases.

Under the AbbVie Agreement, we granted AbbVie an exclusive option to global development and commercialization for our TREM2 and SIGLEC 3
programs. The terms of the AbbVie Agreement included initial upfront payments of $205.0 million and $20.0 million from the sale of shares of our Series E
preferred stock, and if AbbVie exercises its option for both programs, we are eligible for up to an additional $985.6 million in option exercise and milestone
payments. Following AbbVie’s exercise of its option, Alector and AbbVie will share the development costs and will split global profits after marketing
approval. However, following AbbVie’s option exercise for a program, we may opt out of sharing in development costs and profits or losses from that
program and instead receive a tiered royalty on sales of products from that program. We are responsible for the design and execution of Phase 1 and Phase 2
studies, taking advantage of our significant in-house expertise in running clinical trials in Alzheimer’s disease. Following its exercise of an option for a
program, AbbVie will be responsible for certain development activities and global commercialization, taking advantage of its global clinical trial expertise
and commercialization networks. Through this partnership, we aim to leverage the strengths of both organizations efficiently to best achieve the desired
outcome.

Exercise of options. AbbVie may exercise its option for a program at any time until the expiration of an option term for that program. For each

program, the option term ends following a fixed period after AbbVie’s receipt of the data package that includes certain information relating to the applicable
program’s research and development activities. If AbbVie fails to exercise its option during the option term for a product candidate, we will

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retain all rights to that program. If AbbVie exercises its option for a program, then AbbVie will lead development and commercialization activities worldwide.
Once AbbVie opts in with respect to a given product candidate, AbbVie must use commercially reasonable efforts to develop and commercialize the
corresponding product globally.

Governance. The collaboration is governed by a joint steering committee (JSC). The JSC may establish additional subcommittees to oversee
particular projects or activities. Subject to limitations specified in the AbbVie Agreement, if the applicable governance committee is unable to make a
decision by consensus and the parties are unable to resolve the issue through escalation to specified senior executive officers of the parties, then the issue is
escalated to an alternative dispute resolution subject to final decision-making rights retained by each party.

Exclusivity. During the term of the AbbVie Agreement, each of Alector and AbbVie are subject to exclusivity requirements prohibiting certain

activities outside of the AbbVie Agreement directed to targets under the AbbVie Agreement.

Intellectual Property. Ownership of intellectual property created in connection with the AbbVie Agreement is generally determined on the basis of
inventorship. Generally, each party has the first right to prosecute and maintain its own patents. We generally have the first right to prosecute and maintain
joint patents prior to AbbVie’s exercise of its option for the program relating to such patent, and AbbVie has the right following its exercise of such option.
AbbVie has the first right to prosecute any infringement of jointly held patents developed under the AbbVie Agreement and our patents that are licensed
under the AbbVie Agreement. Additionally, AbbVie has the sole right to prosecute its own patents. AbbVie has the first right to defend against claims that a
product developed under either of the programs that are the subject of the AbbVie Agreement infringe third-party intellectual property rights.

Term and Termination. At any point during the term of the AbbVie Agreement, including during the research, development, and clinical trial
process, AbbVie can terminate the AbbVie Agreement in its entirety, or with respect to either program under the AbbVie Agreement, for convenience. In that
event, all rights related to the applicable program revert to us. Additionally, AbbVie or we and can terminate the AbbVie Agreement in connection with a
material breach of the AbbVie Agreement by the other party that remains uncured for a specified period of time.

Adimab Collaboration Agreement

Overview

In 2014, we entered into the Adimab Collaboration Agreement. Under the Adimab Collaboration Agreement, we are required to fund, and we and

Adimab LLC (Adimab) are required to use commercially reasonable efforts to conduct, certain research to discover and optimize antibodies directed against
targets selected by us. We are developing antibodies discovered by Adimab in our AL001 and AL101 product candidates, and we are developing antibodies
optimized by Adimab in our AL002 and AL003 product candidates.

Governance. Our collaboration with Adimab is governed by a research committee consisting of at least two representatives from each party. The

research committee prioritizes among research programs and prepares and finalizes new proposed research plans, among other activities. If the research
committee is unable to make a decision by consensus and the parties are unable to resolve the issue through escalation to specified senior executive officers of
the parties, then either party may seek arbitration of the matter.

Exclusivity. Pursuant to the Adimab Collaboration Agreement, each party is subject to limitations on its ability to use information or material

provided by the other outside the scope of the collaboration.

Intellectual Property. Ownership of intellectual property arising from the research is generally owned by the party that invents or creates the

applicable intellectual property, although certain categories of intellectual property are specifically assigned to one party or the other. For example, patent
rights relating to improvements to Adimab’s background platform technology that are invented in the course of the research are assigned to Adimab. Prior to
our exercise of the option described below, we and Adimab each grant the other a non-exclusive license to the relevant intellectual property we own to allow
each party to carry out its rights and obligations in connection with the

27

 
research; and except for Adimab’s retained rights to continue using and licensing its own libraries, each party agrees not to practice or license the patents
arising out of the research that it owns for any purpose other than to carry out its rights and obligations in connection with the research. Generally, each party
has the obligation to prosecute, maintain, defend, and enforce its own patents, but we are subject to certain contractual restrictions on our ability to prosecute,
practice, and license certain of our patents that arose out of the research. These restrictions are lifted once we exercise the option described below as to such
patents.

Exercise of Options. The Adimab Collaboration Agreement granted us an exclusive option to obtain certain rights relating to a specified number of

antibodies discovered or optimized by Adimab directed against the targets we selected. The option extended to ownership of patent rights specifically
covering the sequences of such antibodies, and the right to obtain worldwide, royalty-bearing, sublicensable licenses under certain technology owned or
developed by Adimab to research, develop, make, have made, use, sell, offer to sell, import and export such antibodies and products based on such antibodies
for all human therapeutic, prophylactic and diagnostic uses. These licenses are exclusive, except as to Adimab background and platform technology and
Adimab’s retained rights to continue using and licensing its own libraries, as to which the licenses are be non-exclusive. We have confirmed with Adimab in
writing that key patents we have filed relating to the programs partnered with AbbVie claim inventions owned solely by us, and do not include any such
background or platform technology of Adimab. All of our options under the Adimab Collaboration Agreement have either expired, are in the process of being
exercised, or, with respect to multiple targets and hundreds of antibodies (including the target programs partnered with AbbVie), have already been exercised.
Upon our exercise of the option with respect to a target, we are subject to an obligation to devote commercially reasonable efforts to commercialize products
using the optioned rights to such target. The assigned and licensed patent rights we obtained from these option exercises are described in more detail above
under the section titled “Business—Intellectual Property.”

Financial terms. We fund Adimab’s research in connection with our collaboration, in accordance with the terms and limitations described in the

Adimab Collaboration Agreement. We also have potential milestone payments per program for use of antibodies and low- to mid-single digit royalty
payments for commercial sales of products incorporating such antibodies. However, if we enter into any transaction granting rights to the inventions or sell
products created as a result of a collaboration with a third party, we have a choice to pay a share of the resulting revenue instead of royalties from such sales.

Term and Termination. We are able to terminate the Adimab Collaboration Agreement, in its entirety or with respect to a products or antibodies

directed to particular targets, on three months prior written notice to Adimab. In addition, either party can terminate the Adimab Agreement in its entirety, or,
subject to certain limitations, with respect to specific optioned rights, for material breaches that remain uncured after 90 days’ notice to the breaching party. In
the case of a termination before expiration of the Adimab Agreement, we would have certain continuing payment obligations to Adimab, or would be
required to adhere to certain restrictions as to the fruits of the collaboration. The Adimab Collaboration Agreement expires on the twelfth anniversary of the
first commercial sale of the products created under the collaboration, on a product-by-product and country-by-country basis. The licenses we and Adimab
granted to each other do not survive, subject to certain limitations.

Manufacturing

We must manufacture our product candidates for clinical trial use in compliance with cGMP regulations. The cGMP regulations include requirements

relating to organization of personnel, buildings and facilities, equipment, control of components and drug product containers and closures, production and
process controls, packaging and labeling controls, holding and distribution, laboratory controls, records and reports, and returned or salvaged products. The
manufacturing facilities for our product candidates must meet cGMP requirements and FDA or comparable foreign regulatory authority’s satisfaction before
any product is approved for human clinical trial use. Our third-party manufacturers will also be subject to periodic inspections of their respective facilities for
general cGMP compliance by the FDA and other foreign authorities. These inspections may include review of procedures and operations used in the testing
and manufacture of our products to assess compliance with applicable regulations.

We do not currently have the infrastructure or internal capability to manufacture our product candidates for use in clinical trials and

commercialization. We rely, and expect to continue to rely, on third-party cGMP manufacturers for the production of our products for human clinical trials in
compliance with FDA and other foreign

28

 
authority regulations for such products. We rely on contract development and manufacturing organizations (CDMOs) to manufacture and supply our
preclinical and clinical materials to be used during the preclinical and clinical development of our product candidates. As part of our broad manufacturing
strategy to expedite the manufacturing of our product candidates and minimize manufacturing risk, we have established non-exclusive relationships with
several CDMOs, including Lonza Biologics for the manufacturing of AL001 and AL002, Celonic AG for the manufacturing of AL003, and EMD Millipore
Corporation for the manufacturing of AL101.

We do not have long-term supply agreements and we purchase our required drug product on a development manufacturing services agreement or
purchase order basis. We expect to continue to rely on third-party manufacturers for the commercial supply of any of our product candidates for which we
obtain marketing approval. We have personnel with significant technical, manufacturing, analytical, quality, regulatory, including cGMP, and project
management experience to oversee our third-party manufacturers and to manage manufacturing and quality data and information for regulatory compliance
purposes.

Failure to comply with statutory and regulatory requirements subjects a manufacturer to possible legal or regulatory action, including warning letters,
the seizure or recall of products, injunctions, consent decrees placing significant restrictions on or suspending manufacturing operations and civil and criminal
penalties. Contract manufacturers often encounter difficulties involving production yields, quality control and quality assurance, as well as shortages of
qualified personnel. Any of these actions or events could have a material impact on the availability of our products.

Commercialization Plan

We do not currently have any approved drugs and we do not expect to have any approved drugs in the near term. Therefore, we have no sales,
marketing or commercial product distribution capabilities and have no experience as a company in marketing drugs. When, and if any of our product
candidates are approved for commercialization, we intend to develop a commercialization infrastructure for those products in the United States, Europe, Asia,
and potentially in certain other key markets. We may also rely on partnerships, such as our AbbVie collaboration, to provide commercialization infrastructure,
including sales and marketing and commercial distribution.

Intellectual Property

Our success depends in part on our ability to obtain and maintain proprietary protection for our product candidates, technology and know-how, to
operate without infringing the proprietary rights of others and to prevent others from infringing our proprietary rights. Our strategy is to seek to protect our
proprietary position by, among other methods, pursuing and obtaining patent protection in the United States and in jurisdictions outside of the United States
related to our proprietary technology, inventions, improvements and product candidates that are important to the development and implementation of our
business. Our patent portfolio is intended to cover our product candidates and related components, their methods of use and processes for their manufacture,
our proprietary reagents and assays and any other inventions that are commercially important to our business. We also rely on trademarks as well as trade
secret protection of our confidential information and know-how relating to our proprietary technology, platforms and product candidates. We believe that we
have substantial know-how and trade secrets relating to our technology and product candidates.

Our patent portfolio as of contains over 25 families, which include one issued patent and over 100 pending patent applications, directed to over 15

different targets and/or technologies, that are solely owned or exclusively licensed by us. For our product candidates, we generally pursue multilayered patent
protection covering the composition of matter based on binding epitopes of the product candidates on the target protein, functional characteristics of the
product candidates, degenerative sequence of the product candidates, and/or specific sequence of the product candidates. In addition to composition of matter
coverage, we also generally pursue claims directed to methods of making, nucleic acids, formulations, and methods of use of the product candidates. The
method of use claims further include claims directed to patient selection criteria, biomarkers, disease subgroups, pharmacodynamic and clinical end-points,
and dosage regimes. As further described below, we intend to strengthen the patent protection of our product candidates and technologies through additional
patent application filings.

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PGRN Programs

We own three patent families directed to our PGRN programs, AL001 and AL101, which include one issued U.S. patent, four pending U.S. non-

provisional patent applications, one pending U.S. provisional patent application, and multiple pending foreign patent applications covering the compositions
and uses of our PGRN program product candidates and one U.S. non-provisional patent application to methods of screening. Two patent families are expected
to expire in 2036 and the third patent family, assuming that the necessary non-provisional patent applications are timely filed and all other applicable
requirements are satisfied for the U.S. provisional patent application, in 2039, in both cases excluding any patent term adjustments and any patent term
extensions.

TREM2 Program

We own three patent families directed to the TREM2 program, which include four pending U.S. non-provisional patent applications, and multiple
pending foreign patent applications all covering the compositions and uses of our TREM2 program product candidates. The patent families are expected to
expire in 2035, 2036, and 2038, respectively, in all cases excluding any patent term adjustments and any patent term extensions.

SIGLEC 3 Program

We own four patent families directed to the SIGLEC 3 program, which include three pending U.S. non-provisional patent applications, one pending
U.S. provisional patent application, and multiple pending foreign patent applications covering the compositions and uses of our SIGLEC 3 program product
candidates. Two patent families are expected to expire in 2036, the third patent family in 2038, and the fourth patent family, assuming that the necessary non-
provisional patent applications are timely filed and all other applicable requirements are satisfied for the U.S. provisional patent application, in 2039, in all
cases excluding any patent term adjustments and any patent term extensions.

The term of individual patents depends upon the legal term for patents in the countries in which they are granted. In most countries, including the

United States, the patent term is generally 20 years from the earliest claimed filing date of a non-provisional patent application in the applicable country. In
the United States, a patent’s term may, in certain cases, be lengthened by patent term adjustment, which compensates a patentee for administrative delays by
the U.S. Patent and Trademark Office in examining and granting a patent, or may be shortened if a patent is terminally disclaimed over a commonly owned
patent or a patent naming a common inventor and having an earlier expiration date. The Drug Price Competition and Patent Term Restoration Act of 1984
(Hatch-Waxman Act) permits a patent term extension of up to five years beyond the expiration date of a U.S. patent as partial compensation for the length of
time the drug is under regulatory review while the patent is in force. A patent term extension cannot extend the remaining term of a patent beyond a total of
14 years from the date of product approval, only one patent applicable to each regulatory review period may be extended and only those claims covering the
approved drug, a method for using it or a method for manufacturing it, may be extended.

Similar provisions are available in the European Union and certain other foreign jurisdictions to extend the term of a patent that covers an approved

drug. In the future, if and when our product candidates receive approval by the FDA or foreign regulatory authorities, we expect to apply for patent term
extensions on issued patents covering those products, depending upon the length of the clinical trials for each drug and other factors. Expiration dates referred
to above are without regard to potential patent term extension or other market exclusivity that may be available to us.

We also rely, in some circumstances, on trade secrets to protect our technology. However, trade secrets can be difficult to protect. We seek to protect
our proprietary technology and processes, in part, by confidentiality agreements with our employees, consultants, scientific advisors and contractors. We also
seek to preserve the integrity and confidentiality of our data and trade secrets by maintaining physical security of our premises and physical and electronic
security of our information technology systems.

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Competition

The biotechnology and pharmaceutical industries, including in the neurodegenerative disease field, are characterized by rapidly advancing
technologies, strong competition and an emphasis on intellectual property. We face substantial competition from many different sources, including large and
specialty pharmaceutical and biotechnology companies, academic research institutions, governmental agencies and public and private research institutions.
We believe that the key competitive factors affecting the success of any of our product candidates will include efficacy, safety profile, method of
administration, cost, level of promotional activity and intellectual property protection. 

Our product candidates will compete with current therapies approved for the treatment of neurodegenerative diseases, which to date have been
primarily targeted at treating the symptoms of such diseases rather than halting or slowing the progression of the disease. However, in addition to such
currently approved therapies, we believe that our product candidates, if approved, may also compete with other potential therapies intended to halt or slow the
progression of neurodegenerative disease that are being developed by a number of companies and institutions.

Government Regulation

Government authorities in the United States at the federal, state and local level and in other countries regulate, among other things, the research,

development, testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval
monitoring and reporting, marketing and export and import of drug and biological products. Generally, before a new drug or biologic can be marketed,
considerable data demonstrating its quality, safety and efficacy must be obtained, organized into a format specific for each regulatory authority, submitted for
review and approved by the regulatory authority.

U.S. Drug Development

In the United States, the FDA regulates drugs under the Food, Drug, and Cosmetic Act (FDCA) and biologics under the FDCA and the Public Health

Service Act (PHSA). Both drugs and biologics also are subject to other federal, state and local statutes and regulations. The process of obtaining regulatory
approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations requires the expenditure of substantial time
and financial resources. Failure to comply with the applicable U.S. requirements at any time during the product development process, approval process or
post-market may subject an applicant to administrative or judicial sanctions. These sanctions could include, among other actions, the FDA’s refusal to approve
pending applications, withdrawal of an approval, a clinical hold, untitled or warning letters, product recalls or market withdrawals, product seizures, total or
partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement and civil or criminal penalties.
Any agency or judicial enforcement action could have a material adverse effect on us.

Any future product candidates must be approved by the FDA through either a biologics license application BLA or NDA process before they may be

legally marketed in the United States. The process generally involves the following:

•

•

•

•

•

Completion of extensive preclinical studies in accordance with applicable regulations, including studies conducted in accordance with GLP;

Submission to the FDA of an investigational new drug application (IND), which must become effective before human clinical trials may
begin;

Approval by an independent Institutional Review Board (IRB), or ethics committee at each clinical trial site before each trial may be
initiated;

Performance of adequate and well-controlled human clinical trials in accordance with applicable IND regulations, good clinical practice
(GCP), requirements and other clinical trial-related regulations to establish the safety and efficacy of the investigational product for each
proposed indication;

Submission to the FDA of a new drug application (NDA) or BLA;

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•

•

•
•

•

A determination by the FDA within 60 days of its receipt of an NDA or BLA to accept the filing for review;

Satisfactory completion of a FDA pre-approval inspection of the manufacturing facility or facilities where the drug or biologic will be
produced to assess compliance with cGMP, requirements to assure that the facilities, methods and controls are adequate to preserve the drug
or biologic’s identity, strength, quality and purity;

Potential FDA audit of the preclinical study and/or clinical trial sites that generated the data in support of the NDA or BLA;  
FDA review and approval of the NDA or BLA, including consideration of the views of any FDA advisory committee, prior to any
commercial marketing or sale of the drug or biologic in the United States; and

Compliance with any post-approval requirements, including the potential requirement to implement a Risk Evaluation and Mitigation
Strategy (REMS), and the potential requirement to conduct post-approval studies.

The data required to support an NDA or BLA are generated in two distinct developmental stages: preclinical and clinical. The preclinical and clinical

testing and approval process requires substantial time, effort and financial resources, and we cannot be certain that any approvals for any future product
candidates will be granted on a timely basis, or at all.

Preclinical Studies and IND

The preclinical developmental stage generally involves laboratory evaluations of drug chemistry, formulation and stability, as well as studies to

evaluate toxicity in animals, which support subsequent clinical testing. The sponsor must submit the results of the preclinical studies, together with
manufacturing information, analytical data, any available clinical data or literature and a proposed clinical protocol, to the FDA as part of the IND. An IND is
a request for authorization from the FDA to administer an investigational product to humans, and must become effective before human clinical trials may
begin.

Preclinical studies include laboratory evaluation of product chemistry and formulation, as well as in vitro and animal studies to assess the potential

for adverse events and in some cases to establish a rationale for therapeutic use. The conduct of preclinical studies is subject to federal regulations and
requirements, including GLP regulations for safety/toxicology studies. An IND sponsor must submit the results of the preclinical tests, together with
manufacturing information, analytical data, any available clinical data or literature and plans for clinical studies, among other things, to the FDA as part of an
IND. Some long-term preclinical testing, such as animal tests of reproductive adverse events and carcinogenicity, may continue after the IND is submitted.
An IND automatically becomes effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns or questions related to one or
more proposed clinical trials and places the trial on clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before
the clinical trial can begin. As a result, submission of an IND may not result in the FDA allowing clinical trials to commence.

Clinical Trials

The clinical stage of development involves the administration of the investigational product to healthy volunteers or patients under the supervision of

qualified investigators, generally physicians not employed by or under the trial sponsor’s control, in accordance with GCP requirements, which include the
requirement that all research subjects provide their informed consent for their participation in any clinical trial. Clinical trials are conducted under protocols
detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria and the parameters to be used to
monitor subject safety and assess efficacy. Each protocol, and any subsequent amendments to the protocol, must be submitted to the FDA as part of the IND.
Furthermore, each clinical trial must be reviewed and approved by an IRB for each institution at which the clinical trial will be conducted to ensure that the
risks to individuals participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the informed
consent form that must be provided to each clinical trial subject or his or her legal representative, and must monitor the clinical trial until

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completed. There also are requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries.

A sponsor who wishes to conduct a clinical trial outside of the United States may, but need not, obtain FDA authorization to conduct the clinical trial
under an IND. If a foreign clinical trial is not conducted under an IND, the sponsor may submit data from the clinical trial to the FDA in support of an NDA
or BLA. The FDA will accept a well-designed and well-conducted foreign clinical trial not conducted under an IND if the trial was conducted in accordance
with GCP requirements and the FDA is able to validate the data through an onsite inspection if deemed necessary.

Clinical trials in the United States generally are conducted in three sequential phases, known as Phase 1, Phase 2, and Phase 3, and may overlap.

•

•

•

Phase 1 clinical trials generally involve a small number of healthy volunteers or disease-affected patients who are initially exposed to a single
dose and then multiple doses of the product candidate. The primary purpose of these clinical trials is to assess the metabolism, pharmacologic
action, tolerability and safety of the drug.

Phase 2 clinical trials involve studies in disease-affected patients to determine the dose required to produce the desired benefits. At the same
time, safety and further pharmacokinetic and pharmacodynamic information is collected, possible adverse effects and safety risks are
identified, and a preliminary evaluation of efficacy is conducted.

Phase 3 clinical trials generally involve a large number of patients at multiple sites and are designed to provide the data necessary to
demonstrate the effectiveness of the product for its intended use, its safety in use and to establish the overall benefit/risk relationship of the
product and provide an adequate basis for product approval. These trials may include comparisons with placebo and/or other comparator
treatments. The duration of treatment is often extended to mimic the actual use of a product during marketing.

Post-approval trials, sometimes referred to as Phase 4 clinical trials, may be conducted after initial marketing approval. These trials are used to gain

additional experience from the treatment of patients in the intended therapeutic indication. In certain instances, the FDA may mandate the performance of
Phase 4 clinical trials as a condition of approval of an NDA or BLA.

Progress reports detailing the results of the clinical trials, among other information, must be submitted at least annually to the FDA and written IND

safety reports must be submitted to the FDA and the investigators for serious and unexpected suspected adverse events, findings from other studies suggesting
a significant risk to humans exposed to the drug or biologic, findings from animal or in vitro testing that suggest a significant risk for human subjects and any
clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator brochure.

Phase 1, Phase 2, and Phase 3 clinical trials may not be completed successfully within any specified period, if at all. The FDA or the sponsor may

suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an
unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in
accordance with the IRB’s requirements or if the drug or biologic has been associated with unexpected serious harm to patients. Additionally, some clinical
trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, known as a data safety monitoring board or committee.
This group provides authorization for whether a trial may move forward at designated check-points based on access to certain data from the trial. Concurrent
with clinical trials, companies usually complete additional animal studies and also must develop additional information about the chemistry and physical
characteristics of the drug or biologic as well as finalize a process for manufacturing the product in commercial quantities in accordance with cGMP
requirements. The manufacturing process must be capable of consistently producing quality batches of the product and, among other things, companies must
develop methods for testing the identity, strength, quality and purity of the final product. Additionally, appropriate packaging must be selected and tested, and
stability studies must be conducted to demonstrate that our product candidates do not undergo unacceptable deterioration over their shelf life.

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NDA/BLA Review Process

Following completion of the clinical trials, data is analyzed to assess whether the investigational product is safe and effective for the proposed

indicated use or uses. The results of preclinical studies and clinical trials are then submitted to the FDA as part of an NDA or BLA, along with proposed
labeling, chemistry and manufacturing information to ensure product quality and other relevant data. In short, the NDA or BLA is a request for approval to
market the drug or biologic for one or more specified indications and must contain proof of safety and efficacy for a drug or safety, purity, and potency for a
biologic. The application may include both negative and ambiguous results of preclinical studies and clinical trials, as well as positive findings. Data may
come from company-sponsored clinical trials intended to test the safety and efficacy of a product’s use or from a number of alternative sources, including
studies initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and
efficacy of the investigational product to the satisfaction of FDA. FDA approval of an NDA or BLA must be obtained before a drug or biologic may be
marketed in the United States.

Under the Prescription Drug User Fee Act (PDUFA), as amended, each NDA or BLA must be accompanied by a user fee. FDA adjusts the PDUFA
user fees on an annual basis. According to the FDA’s FY 2019 fee schedule, effective through September 30, 2019, the user fee for an application requiring
clinical data, such as an NDA or BLA, is approximately $2.6 million. PDUFA also imposes an annual program fee for each marketed human drug or biologic
($309,915 in 2019) and an annual establishment fee on facilities used to manufacture prescription drugs and biologics. Fee waivers or reductions are available
in certain circumstances, including a waiver of the application fee for the first application filed by a small business. Additionally, no user fees are assessed on
NDAs or BLAs for products designated as orphan drugs, unless the product also includes a non-orphan indication.

The FDA reviews all submitted NDAs and BLAs before it accepts them for filing, and may request additional information rather than accepting the
NDA or BLA for filing. The FDA must make a decision on accepting an NDA or BLA for filing within 60 days of receipt. Once the submission is accepted
for filing, the FDA begins an in-depth review of the NDA or BLA. Under the goals and policies agreed to by the FDA under PDUFA, the FDA has 10
months, from the filing date, in which to complete its initial review of a new molecular-entity NDA or original BLA and respond to the applicant, and six
months from the filing date of a new molecular-entity NDA or original BLA designated for priority review. The FDA does not always meet its PDUFA goal
dates for standard and priority NDAs or BLAs, and the review process is often extended by FDA requests for additional information or clarification.

Before approving an NDA or BLA, the FDA will conduct a pre-approval inspection of the manufacturing facilities for the new product to determine

whether they comply with cGMP requirements. The FDA will not approve the product unless it determines that the manufacturing processes and facilities are
in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. The FDA also may audit
data from clinical trials to ensure compliance with GCP requirements. Additionally, the FDA may refer applications for novel drug products or drug products
which present difficult questions of safety or efficacy to an advisory committee, typically a panel that includes clinicians and other experts, for review,
evaluation and a recommendation as to whether the application should be approved and under what conditions, if any. The FDA is not bound by
recommendations of an advisory committee, but it considers such recommendations when making decisions on approval. The FDA likely will reanalyze the
clinical trial data, which could result in extensive discussions between the FDA and the applicant during the review process. After the FDA evaluates an NDA
or BLA, it will issue an approval letter or a Complete Response Letter. An approval letter authorizes commercial marketing of the drug with specific
prescribing information for specific indications. A Complete Response Letter indicates that the review cycle of the application is complete and the application
will not be approved in its present form. A Complete Response Letter usually describes all of the specific deficiencies in the NDA or BLA identified by the
FDA. The Complete Response Letter may require additional clinical data, additional pivotal Phase 3 clinical trial(s) and/or other significant and time-
consuming requirements related to clinical trials, preclinical studies or manufacturing. If a Complete Response Letter is issued, the applicant may either
resubmit the NDA or BLA, addressing all of the deficiencies identified in the letter, or withdraw the application. Even if such data and information are
submitted, the FDA may decide that the NDA or BLA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive
and the FDA may interpret data differently than we interpret the same data.

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Orphan Drugs

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biological product intended to treat a rare disease or condition,
which is generally a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United
States and for which there is no reasonable expectation that the cost of developing and making the product available in the United States for this type of
disease or condition will be recovered from sales of the product.

Orphan drug designation must be requested before submitting an NDA or BLA. After the FDA grants orphan drug designation, the identity of the
therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in or shorten the
duration of the regulatory review and approval process.

If a product that has orphan designation subsequently receives the first FDA approval for the disease or condition for which it has such designation,

the product is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same
indication for seven years from the date of such approval, except in limited circumstances, such as a showing of clinical superiority to the product with orphan
exclusivity by means of greater effectiveness, greater safety or providing a major contribution to patient care or in instances of drug supply issues. However,
competitors may receive approval of either a different product for the same indication or the same product for a different indication but that could be used off-
label in the orphan indication. Orphan drug exclusivity also could block the approval of one of our products for seven years if a competitor obtains approval
before we do for the same product, as defined by the FDA, for the same indication we are seeking approval, or if a product candidate is determined to be
contained within the scope of the competitor’s product for the same indication or disease. If one of our products designated as an orphan drug receives
marketing approval for an indication broader than that which is designated, it may not be entitled to orphan drug exclusivity. Orphan drug status in the
European Union has similar, but not identical, requirements and benefits.

Expedited Development and Review Programs

The FDA has a fast track program that is intended to expedite or facilitate the process for reviewing new drugs and biologics that meet certain

criteria. Specifically, new drugs and biologics are eligible for fast track designation if they are intended to treat a serious or life-threatening condition and
preclinical or clinical data demonstrate the potential to address unmet medical needs for the condition. Fast track designation applies to both the product and
the specific indication for which it is being studied. The sponsor can request the FDA to designate the product for fast track status any time before receiving
NDA or BLA approval, but ideally no later than the pre-NDA or pre-BLA meeting.

Any product submitted to the FDA for marketing, including under a fast track program, may be eligible for other types of FDA programs intended to

expedite development and review, such as priority review and accelerated approval. Any product is eligible for priority review if it treats a serious or life-
threatening condition and, if approved, would provide a significant improvement in safety and effectiveness compared to available therapies.

A product may also be eligible for accelerated approval, if it treats a serious or life-threatening condition and generally provides a meaningful
advantage over available therapies. In addition, it must demonstrate an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit or on
a clinical endpoint that can be measured earlier than irreversible morbidity or mortality (IMM), which is reasonably likely to predict an effect on IMM or
other clinical benefit. As a condition of approval, the FDA may require that a sponsor of a drug or biologic receiving accelerated approval perform adequate
and well-controlled post-marketing clinical trials. If the FDA concludes that a drug or biologic shown to be effective can be safely used only if distribution or
use is restricted, it may require such post-marketing restrictions as it deems necessary to assure safe use of the product.

Additionally, a drug or biologic may be eligible for designation as a breakthrough therapy if the product is intended, alone or in combination with one

or more other drugs or biologics, to treat a serious or life-threatening condition and preliminary clinical evidence indicates that the product may demonstrate
substantial improvement over currently approved therapies on one or more clinically significant endpoints. The benefits of breakthrough therapy designation
include the same benefits as fast track designation, plus intensive guidance from the FDA to

35

 
ensure an efficient drug development program. Fast track designation, priority review, accelerated approval and breakthrough therapy designation do not
change the standards for approval, but may expedite the development or approval process.

Abbreviated Licensure Pathway of Biological Products as Biosimilar or Interchangeable

The Patient Protection and Affordable Care Act, or Affordable Care Act (ACA), signed into law in 2010, includes the BPCIA, which created an

abbreviated approval pathway for biological products shown to be highly similar to an FDA-licensed reference biological product. The BPCIA attempts to
minimize duplicative testing, and thereby lower development costs and increase patient access to affordable treatments. An application for licensure of a
biosimilar product must include information demonstrating biosimilarity based upon the following, unless the FDA determines otherwise:

•

•

•

analytical studies demonstrating that the proposed biosimilar product is highly similar to the approved product notwithstanding minor
differences in clinically inactive components;

animal studies (including the assessment of toxicity); and

a clinical trial or trials (including the assessment of immunogenicity and pharmacokinetic or pharmacodynamic) sufficient to demonstrate
safety, purity and potency in one or more conditions for which the reference product is licensed and intended to be used.

In addition, an application must include information demonstrating that:

•

•

•

•

the proposed biosimilar product and reference product utilize the same mechanism of action for the condition(s) of use prescribed,
recommended or suggested in the proposed labeling, but only to the extent the mechanism(s) of action are known for the reference product;

the condition or conditions of use prescribed, recommended or suggested in the labeling for the proposed biosimilar product have been
previously approved for the reference product;

the route of administration, the dosage form and the strength of the proposed biosimilar product are the same as those for the reference
product; and

the facility in which the biological product is manufactured, processed, packed or held meets standards designed to assure that the biological
product continues to be safe, pure, and potent.

Biosimilarity means that the biological product is highly similar to the reference product notwithstanding minor differences in clinically inactive

components; and that there are no clinically meaningful differences between the biological product and the reference product in terms of the safety, purity,
and potency of the product. In addition, the law provides for a designation of “interchangeability” between the reference and biosimilar products, whereby the
biosimilar may be substituted for the reference product without the intervention of the healthcare provider who prescribed the reference product. The higher
standard of interchangeability must be demonstrated by information sufficient to show that:

•

•

•

the proposed product is biosimilar to the reference product;

the proposed product is expected to produce the same clinical result as the reference product in any given patient; and

for a product that is administered more than once to an individual, the risk to the patient in terms of safety or diminished efficacy of
alternating or switching between the biosimilar and the reference product is no greater than the risk of using the reference product without
such alternation or switch.

FDA approval is required before a biosimilar may be marketed in the United States. However, complexities associated with the large and intricate
structures of biological products and the process by which such products are manufactured pose significant hurdles to the FDA’s implementation of the law
that are still being worked out by the FDA. For example, the FDA has discretion over the kind and amount of scientific evidence—laboratory, preclinical
and/or clinical—required to demonstrate biosimilarity to a licensed biological product.

36

 
 
 
 
 
 
 
 
 
 
 
The FDA intends to consider the totality of the evidence provided by a sponsor to support a demonstration of biosimilarity, and recommends that

sponsors use a stepwise approach in the development of their biosimilar products. Biosimilar product applications thus may not be required to duplicate the
entirety of preclinical and clinical testing used to establish the underlying safety and effectiveness of the reference product. However, the FDA may refuse to
approve a biosimilar application if there is insufficient information to show that the active ingredients are the same or to demonstrate that any impurities or
differences in active ingredients do not affect the safety, purity or potency of the biosimilar product. In addition, as with BLAs, biosimilar product
applications will not be approved unless the product is manufactured in facilities designed to assure and preserve the biological product’s safety, purity and
potency.

The submission of a biosimilar application does not guarantee that the FDA will accept the application for filing and review, as the FDA may refuse

to accept applications that it finds are insufficiently complete. The FDA will treat a biosimilar application or supplement as incomplete if, among other
reasons, any applicable user fees assessed under the Biosimilar User Fee Act of 2012 have not been paid. In addition, the FDA may accept an application for
filing but deny approval on the basis that the sponsor has not demonstrated biosimilarity, in which case the sponsor may choose to conduct further analytical,
preclinical or clinical studies and submit a BLA for licensure as a new biological product.

The timing of final FDA approval of a biosimilar for commercial distribution depends on a variety of factors, including whether the manufacturer of

the branded product is entitled to one or more statutory exclusivity periods, during which time the FDA is prohibited from approving any products that are
biosimilar to the branded product. The FDA cannot approve a biosimilar application for 12 years from the date of first licensure of the reference product.
Additionally, a biosimilar product sponsor may not submit an application for four years from the date of first licensure of the reference product. A reference
product may also be entitled to exclusivity under other statutory provisions. For example, a reference product designated for a rare disease or condition (an
orphan drug) may be entitled to seven years of exclusivity, in which case no product that is biosimilar to the reference product may be approved until either
the end of the twelve-year period provided under the biosimilarity statute or the end of the seven-year orphan drug exclusivity period, whichever occurs later.
In certain circumstances, a regulatory exclusivity period can extend beyond the life of a patent, and thus block biosimilarity applications from being approved
on or after the patent expiration date. In addition, the FDA may under certain circumstances extend the exclusivity period for the reference product by an
additional six months if the FDA requests, and the manufacturer undertakes, studies on the effect of its product in children, a so-called pediatric extension.

The first biological product determined to be interchangeable with a branded product for any condition of use is also entitled to a period of
exclusivity, during which time the FDA may not determine that another product is interchangeable with the reference product for any condition of use. This
exclusivity period extends until the earlier of: one year after the first commercial marketing of the first interchangeable product; 18 months after resolution of
a patent infringement against the applicant that submitted the application for the first interchangeable product, based on a final court decision regarding all of
the patents in the litigation or dismissal of the litigation with or without prejudice; 42 months after approval of the first interchangeable product, if a patent
infringement suit against the applicant that submitted the application for the first interchangeable product is still ongoing; or 18 months after approval of the
first interchangeable product if the applicant that submitted the application for the first interchangeable product has not been sued.

Post-Approval Requirements

Following approval of a new product, the manufacturer and the approved product are subject to continuing regulation by the FDA, including, among

other things, monitoring and record-keeping requirements, requirements to report adverse experiences and comply with promotion and advertising
requirements, which include restrictions on promoting drugs for unapproved uses or patient populations, known as “off-label use”, and limitations on
industry-sponsored scientific and educational activities. Although physicians may prescribe legally available drugs for off-label uses, manufacturers may not
market or promote such uses. Prescription drug promotional materials must be submitted to the FDA in conjunction with their first use. Further, if there are
any modifications to the drug or biologic, including changes in indications, labeling or manufacturing processes or facilities, the applicant may be required to
submit and obtain FDA approval of a new NDA/BLA or NDA/BLA supplement, which may require the development of additional data or preclinical studies
and clinical trials.

37

 
The FDA may also place other conditions on approvals including the requirement for REMS, to assure the safe use of the product. A REMS could

include medication guides, physician communication plans or elements to assure safe use, such as restricted distribution methods, patient registries and other
risk minimization tools. Any of these limitations on approval or marketing could restrict the commercial promotion, distribution, prescription or dispensing of
products. Product approvals may be withdrawn for non-compliance with regulatory standards or if problems occur following initial marketing.

The FDA may withdraw approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product
reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with
manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information;
imposition of post-market studies or clinical studies to assess new safety risks or imposition of distribution restrictions or other restrictions under a REMS
program. Other potential consequences include, among other things:

•

•

•

•

•

•

restrictions on the marketing or manufacturing of the product, complete withdrawal of the product from the market, or product recalls;

fines, warning letters, or holds on post-approval clinical studies;

refusal of the FDA to approve pending applications or supplements to approved applications;

applications, or suspension or revocation of product license approvals;

product seizure or detention, or refusal to permit the import or export of products; or

injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs and biologics may be
promoted only for the approved indications and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the
laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to
significant liability.

Other U.S. Regulatory Matters

Manufacturing, sales, promotion and other activities following product approval are also subject to regulation by numerous regulatory authorities in
the United States in addition to the FDA, including the Centers for Medicare & Medicaid Services, other divisions of the Department of Health and Human
Services, the Department of Justice, the Drug Enforcement Administration, the Consumer Product Safety Commission, the Federal Trade Commission, the
Occupational Safety & Health Administration, the Environmental Protection Agency, and state and local governments.

For example, in the United States, sales, marketing and scientific and educational programs also must comply with state and federal fraud and abuse

laws. These laws include the federal Anti-Kickback Statute, which makes it illegal for any person, including a prescription drug manufacturer (or a party
acting on its behalf), to knowingly and willfully solicit, receive, offer or pay any remuneration that is intended to induce or reward referrals, including the
purchase, recommendation, order or prescription of a particular drug, for which payment may be made under a federal healthcare program, such as Medicare
or Medicaid. Violations of this law are punishable by up to five years in prison, criminal fines, administrative civil money penalties and exclusion from
participation in federal healthcare programs. Moreover, the ACA provides that the government may assert that a claim including items or services resulting
from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act.

Pricing and rebate programs must comply with the Medicaid rebate requirements of the U.S. Omnibus Budget Reconciliation Act of 1990 and more
recent requirements in the ACA. If products are made available to authorized users of the Federal Supply Schedule of the General Services Administration,
additional laws and requirements apply. Products must meet applicable child-resistant packaging requirements under the U.S. Poison Prevention

38

 
 
 
 
 
 
 
Packaging Act. Manufacturing, sales, promotion and other activities also are potentially subject to federal and state consumer protection and unfair
competition laws.

The distribution of biologic and pharmaceutical products is subject to additional requirements and regulations, including extensive record-keeping,

licensing, storage and security requirements intended to prevent the unauthorized sale of pharmaceutical products.

The failure to comply with any of these laws or regulatory requirements subjects firms to possible legal or regulatory action. Depending on the

circumstances, failure to meet applicable regulatory requirements can result in criminal prosecution, fines or other penalties, injunctions, requests for recall,
seizure of products, total or partial suspension of production, denial or withdrawal of product approvals or refusal to allow a firm to enter into supply
contracts, including government contracts. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur
significant legal expenses and divert our management’s attention from the operation of our business. Prohibitions or restrictions on sales or withdrawal of
future products marketed by us could materially affect our business in an adverse way.

Changes in regulations, statutes or the interpretation of existing regulations could impact our business in the future by requiring, for example: changes
to our manufacturing arrangements; additions or modifications to product labeling; the recall or discontinuation of our products; or additional record-keeping
requirements. If any such changes were to be imposed, they could adversely affect the operation of our business.

U.S. Patent-Term Restoration and Marketing Exclusivity

Depending upon the timing, duration and specifics of FDA approval of any future product candidates, some of our U.S. patents may be eligible for

limited patent term extension under the Hatch-Waxman Act. The Hatch-Waxman Act permits restoration of the patent term of up to five years as
compensation for patent term lost during product development and FDA regulatory review process. Patent-term restoration, however, cannot extend the
remaining term of a patent beyond a total of 14 years from the product’s approval date. The patent-term restoration period is generally one-half the time
between the effective date of an IND and the submission date of an NDA or BLA plus the time between the submission date of an NDA or BLA and the
approval of that application, except that the review period is reduced by any time during which the applicant failed to exercise due diligence. Only one patent
applicable to an approved drug is eligible for the extension and the application for the extension must be submitted prior to the expiration of the patent. The
United States Patent and Trademark Office (USPTO), in consultation with the FDA, reviews and approves the application for any patent term extension or
restoration. In the future, we may apply for restoration of patent term for our currently owned or licensed patents to add patent life beyond its current
expiration date, depending on the expected length of the clinical trials and other factors involved in the filing of the relevant NDA or BLA.

Market exclusivity provisions under the FDCA also can delay the submission or the approval of certain applications. The FDCA provides a five-year
period of non-patent marketing exclusivity within the United States to the first applicant to gain approval of a NDA for a new chemical entity. A drug is a new
chemical entity if the FDA has not previously approved any other new drug containing the same active moiety, which is the molecule or ion responsible for
the action of the drug substance. During the exclusivity period, the FDA may not accept for review an abbreviated new drug application (ANDA), or a 505(b)
(2) NDA submitted by another company for another version of such drug where the applicant does not own or have a legal right of reference to all the data
required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or non-infringement. The
FDCA also provides three years of marketing exclusivity for a NDA, 505(b)(2) NDA or supplement to an existing NDA if new clinical investigations, other
than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for
example, new indications, dosages or strengths of an existing drug. This three-year exclusivity covers only the conditions of use associated with the new
clinical investigations and does not prohibit the FDA from approving ANDAs for drugs containing the original active agent. Five-year and three-year
exclusivity will not delay the submission or approval of a full NDA. However, an applicant submitting a full NDA would be required to conduct or obtain a
right of reference to all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness.

39

 
A reference biological product is granted 12 years of data exclusivity from the time of first licensure of the product, and the FDA will not accept an

application for a biosimilar or interchangeable product based on the reference biological product until four years after the date of first licensure of the
reference product. “First licensure” typically means the initial date the particular product at issue was licensed in the United States. Date of first licensure
does not include the date of licensure of (and a new period of exclusivity is not available for) a biological product if the licensure is for a supplement for the
biological product or for a subsequent application by the same sponsor or manufacturer of the biological product (or licensor, predecessor in interest or other
related entity) for a change (not including a modification to the structure of the biological product) that results in a new indication, route of administration,
dosing schedule, dosage form, delivery system, delivery device or strength or for a modification to the structure of the biological product that does not result
in a change in safety, purity or potency. Therefore, one must determine whether a new product includes a modification to the structure of a previously licensed
product that results in a change in safety, purity or potency to assess whether the licensure of the new product is a first licensure that triggers its own period of
exclusivity. Whether a subsequent application, if approved, warrants exclusivity as the “first licensure” of a biological product is determined on a case-by-
case basis with data submitted by the sponsor.

European Union Drug Development

Similar to the United States, the various phases of preclinical and clinical research in the European Union are subject to significant regulatory

controls. Although the EU Clinical Trials Directive 2001/20/EC has sought to harmonize the EU clinical trials regulatory framework, setting out common
rules for the control and authorization of clinical trials in the EU, the EU Member States have transposed and applied the provisions of the Directive
differently. This has led to significant variations in the member state regimes. Under the current regime, before a clinical trial can be initiated it must be
approved in each of the EU countries where the trial is to be conducted by two distinct bodies: the National Competent Authority (NCA), and one or more
Ethics Committees (ECs). Under the current regime all suspected unexpected serious adverse reactions to the investigated drug that occur during the clinical
trial have to be reported to the NCA and ECs of the Member State where they occurred.

The EU clinical trials legislation currently is undergoing a transition process mainly aimed at harmonizing and streamlining clinical-trial

authorization, simplifying adverse-event reporting procedures, improving the supervision of clinical trials and increasing their transparency. Recently enacted
Clinical Trials Regulation EU No 536/2014 ensures that the rules for conducting clinical trials in the EU will be identical. In the meantime, Clinical Trials
Directive 2001/20/EC continues to govern all clinical trials performed in the EU.

European Union Drug Review and Approval

In the European Economic Area (EEA), which is comprised of the 27 Member States of the European Union (including Norway and excluding

Croatia), Iceland and Liechtenstein, medicinal products can only be commercialized after obtaining a Marketing Authorization (MA). There are two types of
marketing authorizations.

•

•

The Community MA is issued by the European Commission through the Centralized Procedure, based on the opinion of the Committee for
Medicinal Products for Human Use (CHMP), of the European Medicines Agency (EMA), and is valid throughout the entire territory of the
EEA. The Centralized Procedure is mandatory for certain types of products, such as biotechnology medicinal products, orphan medicinal
products, advanced-therapy medicines such as gene-therapy, somatic cell-therapy or tissue-engineered medicines and medicinal products
containing a new active substance indicated for the treatment of HIV, AIDS, cancer, neurodegenerative disorders, diabetes, auto-immune and
other immune dysfunctions and viral diseases. The Centralized Procedure is optional for products containing a new active substance not yet
authorized in the EEA, or for products that constitute a significant therapeutic, scientific or technical innovation or which are in the interest of
public health in the EU.

National MAs, which are issued by the competent authorities of the Member States of the EEA and only cover their respective territory, are
available for products not falling within the mandatory scope of the Centralized Procedure. Where a product has already been authorized for
marketing in a Member State of the EEA, this National MA can be recognized in another Member States through the Mutual Recognition
Procedure. If the product has not received a National MA in any Member State at the time of application, it can be approved simultaneously
in various Member States through the Decentralized

40

 
 
 
 
 
Procedure. Under the Decentralized Procedure an identical dossier is submitted to the competent authorities of each of the Member States in
which the MA is sought, one of which is selected by the applicant as the Reference Member State (RMS). The competent authority of the
RMS prepares a draft assessment report, a draft summary of the product characteristics (SPC), and a draft of the labeling and package leaflet,
which are sent to the other Member States (referred to as the Member States Concerned) for their approval. If the Member States Concerned
raise no objections, based on a potential serious risk to public health, to the assessment, SPC, labeling or packaging proposed by the RMS,
the product is subsequently granted a national MA in all the Member States (i.e., in the RMS and the Member States Concerned).

Under the above described procedures, before granting the MA, the EMA or the competent authorities of the Member States of the EEA make an

assessment of the risk-benefit balance of the product on the basis of scientific criteria concerning its quality, safety and efficacy.

Coverage and Reimbursement

Sales of our products will depend, in part, on the extent to which our products will be covered by third-party payors, such as government health

programs, commercial insurance, and managed healthcare organizations. In the United States, no uniform policy of coverage and reimbursement for drug or
biological products exists. Accordingly, decisions regarding the extent of coverage and amount of reimbursement to be provided for any of our products will
be made on a payor-by-payor basis. As a result, the coverage determination process is often a time-consuming and costly process that will require us to
provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage and adequate reimbursement will
be obtained.

The United States government, state legislatures, and foreign governments have shown significant interest in implementing cost containment
programs to limit the growth of government-paid healthcare costs, including price-controls, restrictions on reimbursement, and requirements for substitution
of generic products for branded prescription drugs. For example, the ACA contains provisions that may reduce the profitability of drug products through
increased rebates for drugs reimbursed by Medicaid programs, extension of Medicaid rebates to Medicaid managed care plans, mandatory discounts for
certain Medicare Part D beneficiaries and annual fees based on pharmaceutical companies’ share of sales to federal health care programs. Adoption of general
controls and measures, coupled with the tightening of restrictive policies in jurisdictions with existing controls and measures, could limit payments for
pharmaceutical drugs.

The Medicaid Drug Rebate Program requires pharmaceutical manufacturers to enter into and have in effect a national rebate agreement with the

Secretary of the Department of Health and Human Services as a condition for states to receive federal matching funds for the manufacturer’s outpatient drugs
furnished to Medicaid patients. The ACA made several changes to the Medicaid Drug Rebate Program, including increasing pharmaceutical manufacturers’
rebate liability by raising the minimum basic Medicaid rebate on most branded prescription drugs from 15.1% of average manufacturer price (AMP), to
23.1% of AMP and adding a new rebate calculation for “line extensions” (i.e., new formulations, such as extended release formulations) of solid oral dosage
forms of branded products, as well as potentially impacting their rebate liability by modifying the statutory definition of AMP. The ACA also expanded the
universe of Medicaid utilization subject to drug rebates by requiring pharmaceutical manufacturers to pay rebates on Medicaid managed care utilization and
by enlarging the population potentially eligible for Medicaid drug benefits. The Centers for Medicare & Medicaid Services (CMS), have proposed to expand
Medicaid rebate liability to the territories of the United States as well.

The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA), established the Medicare Part D program to provide a

voluntary prescription drug benefit to Medicare beneficiaries. Under Part D, Medicare beneficiaries may enroll in prescription drug plans offered by private
entities that provide coverage of outpatient prescription drugs. Unlike Medicare Part A and B, Part D coverage is not standardized. While all Medicare drug
plans must give at least a standard level of coverage set by Medicare, Part D prescription drug plan sponsors are not required to pay for all covered Part D
drugs, and each drug plan can develop its own drug formulary that identifies which drugs it will cover and at what tier or level. However, Part D prescription
drug formularies must include drugs within each therapeutic category and class of covered Part D drugs, though not necessarily all the drugs in each category
or class. Any formulary used by a Part D prescription drug plan must be

41

 
 
developed and reviewed by a pharmacy and therapeutic committee. Government payment for some of the costs of prescription drugs may increase demand for
products for which we receive marketing approval. However, any negotiated prices for our products covered by a Part D prescription drug plan likely will be
lower than the prices we might otherwise obtain. Moreover, while the MMA applies only to drug benefits for Medicare beneficiaries, private payors often
follow Medicare coverage policy and payment limitations in setting their own payment rates. Any reduction in payment that results from the MMA may
result in a similar reduction in payments from non-governmental payors.

For a drug product to receive federal reimbursement under the Medicaid or Medicare Part B programs or to be sold directly to U.S. government

agencies, the manufacturer must extend discounts to entities eligible to participate in the 340B drug pricing program. The required 340B discount on a given
product is calculated based on the AMP and Medicaid rebate amounts reported by the manufacturer.

As noted above, the marketability of any products for which we receive regulatory approval for commercial sale may suffer if the government and

third-party payors fail to provide adequate coverage and reimbursement. An increasing emphasis on cost containment measures in the United States has
increased and we expect will continue to increase the pressure on pharmaceutical pricing. Coverage policies and third-party reimbursement rates may change
at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less
favorable coverage policies and reimbursement rates may be implemented in the future.

In addition, in most foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements

governing drug pricing and reimbursement vary widely from country to country. For example, the European Union provides options for its member states to
restrict the range of medicinal products for which their national health insurance systems provide reimbursement and to control the prices of medicinal
products for human use. A member state may approve a specific price for the medicinal product or it may instead adopt a system of direct or indirect controls
on the profitability of the company placing the medicinal product on the market. There can be no assurance that any country that has price controls or
reimbursement limitations for pharmaceutical products will allow favorable reimbursement and pricing
arrangements for any of our products. Historically, products launched in the European Union do not follow price structures of the United States and generally
prices tend to be significantly lower.

Scientific Advisory Board

We have assembled a highly qualified scientific advisory board comprised of advisors who have, collectively, deep expertise in neurodegenerative
diseases, genomics, protein engineering, drug development, and drug discovery as well as translational medicine. Our scientists work in collaboration with
these advisors to identify new disease targets, develop a biomarker strategy, and accelerate discovery and development.

Name
Adam Boxer, M.D., Ph.D.

Marco Colonna, M.D.

Stephen Hauser, M.D.

Michael Heneka, M.D.

Lewis Lanier, Ph.D.

Liqun Luo, Ph.D.

Bruce Miller, M.D.

Affiliated Entity

Director of UCSF Neuroscience Clinical Research Unit

Washington University School of Medicine in St. Louis

Chair of the Department of Neurology at UCSF

Chair of the Department of Neurology at University of Bonn

Chair of the Department of Microbiology and Immunology at UCSF

Member of National Academy of Sciences, Stanford University

Director of UCSF Dementia Center

Richard Scheller, Ph.D.

Member of National Academy of Sciences, 23andMe

Thomas Christian Südhof, M.D., Ph.D.

Nobel Laureate, Stanford University

Robert Vassar, Ph.D.

Feinberg School of Medicine

42

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Employees

As of December 31, 2018, we had 78 full-time employees, over 75% of whom were engaged in research and development activities. None of our

employees are represented by a labor union or covered under a collective bargaining agreement.

Corporate Information

We were initially formed as a limited liability company in Delaware in May 2013 under the name Alector LLC and completed our restructuring to a

Delaware corporation in October 2017 under the name Alector, Inc. Our principal executive offices are located at 151 Oyster Point Boulevard, Suite 300,
South San Francisco, California 94080. Our telephone number is 415-231-5660. Our website address is www.alector.com. Information contained on, or that
can be accessed through, our website is not incorporated by reference in this Annual Report on Form 10-K or in any other filings we make with the SEC.

We make available on or through our website certain reports and amendments to those reports that we file with or furnish to the SEC in accordance

with the Securities Exchange Act of 1934, as amended (Exchange Act). These include our annual reports on Form 10-K, our quarterly reports on Form 10-Q,
and our current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act. We make
this information available on or through our website free of charge as soon as reasonably practicable after we electronically file the information with, or
furnish it to, the SEC.

We use Alector, the Alector logo, and other marks as trademarks in the United States and other countries. This report contains references to our
trademarks and service marks and to those belonging to other entities. Solely for convenience, trademarks and trade names referred to in this report, including
logos, artwork, and other visual displays, may appear without the ® or TM symbols, but such references are not intended to indicate in any way that we will
not assert, to the fullest extent under applicable law, our rights, or the rights of the applicable licensor to these trademarks and trade names. We do not intend
our use or display of other entities’ trade names, trademarks, or service marks to imply a relationship with, or endorsement or sponsorship of us by, any other
entity.

Item 1A. Risk Factors.

Investing in our common stock involves a high degree of risk. You should carefully consider the risks described below, as well as the other
information in this Annual Report on Form 10-K, including our financial statements and the related notes and the section titled “Management’s Discussion
and Analysis of Financial Condition and Results of Operations.” The occurrence of any of the events or developments described below could harm our
business, financial condition, results of operations, and growth prospects. In such an event, the market price of our common stock could decline, and you may
lose all or part of your investment. Additional risks and uncertainties not presently known to us or that we currently deem immaterial also may impair our
business operations and the market price of our common stock.

Risks Related to Our Business, Financial Condition, and Capital Requirements

We are in the early stages of clinical drug development and have a limited operating history and no products approved for commercial sale, which may
make it difficult to evaluate our current business and predict our future success and viability.

We are a clinical stage biopharmaceutical company with a limited operating history, focused initially on developing therapeutics for

neurodegenerative diseases, including FTD, Alzheimer’s disease, and Parkinson’s disease. We commenced operations in May 2013. To date, we have only
generated revenue from our collaboration arrangements and a government grant. We have no products approved for commercial sale and have not generated
any revenue from product sales. Drug development is a highly uncertain undertaking and involves a substantial degree of risk. We have begun a Phase 1
clinical trial for our product candidate, AL001, which is targeting FTD-GRN patients. We have also begun a Phase 1 clinical trial for our product candidate,
AL002, which is targeting Alzheimer’s disease. To date, we have not initiated or completed a pivotal clinical trial, obtained marketing approval for any
product candidates, manufactured a commercial scale product, or arranged for a third party to do so on our

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behalf, or conducted sales and marketing activities necessary for successful product commercialization. Our short operating history as a company makes any
assessment of our future success and viability subject to significant uncertainty.

We will encounter risks and difficulties frequently experienced by early-stage biopharmaceutical companies in rapidly evolving fields, and we have

not yet demonstrated an ability to successfully overcome such risks and difficulties. If we do not address these risks and difficulties successfully, our business
will suffer.

We have incurred significant net losses in each period since our inception and anticipate that we will continue to incur net losses for the foreseeable
future.

We have incurred net losses in each reporting period since our inception, including net losses of $52.2 million, $32.5 million, and 15.1 million for the

years ended December 31, 2018, 2017, and 2016, respectively. As of December 31, 2018, we had an accumulated deficit of $114.4 million.

We have invested significant financial resources in research and development activities, including for our preclinical and clinical product candidates.

We do not expect to generate revenue from product sales for several years, if at all. The revenue we currently generate from our collaboration arrangement
with AbbVie is variable and limited in amount based on such arrangements. For our collaboration with AbbVie, we recognize collaboration revenue by
measuring the progress towards complete satisfaction of the performance of obligation measured as the program costs are incurred. The amount of our future
net losses will depend, in part, on the level of our future expenditures and revenue. Moreover, our net losses may fluctuate significantly from quarter to
quarter and year to year, such that a period-to-period comparison of our results of operations may not be a good indication of our future performance.

We expect to continue to incur significant expenses and increasingly higher operating losses for the foreseeable future. We anticipate that our

expenses will increase substantially if and as we:

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continue our research and discovery activities;

advance our Discovery Platform, including our target, patient, and biomarker selections;

progress our current and any future product candidates through preclinical and clinical development;

initiate and conduct additional preclinical, clinical, or other studies for our product candidates;

work with our CDMOs to scale up the manufacturing processes for our product candidates or, in the future, establish and operate a
manufacturing facility;

change or add additional contract manufacturers or suppliers;

seek regulatory approvals and marketing authorizations for our product candidates;

establish sales, marketing, and distribution infrastructure to commercialize any products for which we obtain approval;

make milestone, royalty, or other payments due under any license or collaboration agreements;

take steps to seek protection of our intellectual property and defend our intellectual property against challenges from third parties;

obtain, maintain, protect, and enforce our intellectual property portfolio, including intellectual property obtained through license agreements;

attract, hire, and retain qualified personnel;

provide additional internal infrastructure to support our continued research and development operations and any planned commercialization
efforts in the future;

experience any delays or encounter other issues related to our operations;

implementing additional internal systems and infrastructure related to cybersecurity;

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meet the requirements and demands of being a public company; and

defend against any product liability claims or other lawsuits related to our products.

Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and working capital. In
any particular quarter or quarters, our operating results could be below the expectations of securities analysts or investors, which could cause our stock price
to decline.

Drug development is a highly uncertain undertaking and involves a substantial degree of risk.

We have no products approved for commercial sale. To obtain revenues from the sales of our product candidates that are significant or large enough
to achieve profitability, we must succeed, either alone or with third parties, in developing, obtaining regulatory approval for, manufacturing, and marketing
therapies with significant commercial success. Our ability to generate revenue and achieve profitability depends on many factors, including:

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completing research and preclinical and clinical development of our product candidates;

obtaining regulatory approvals and marketing authorizations for product candidates for which we successfully complete clinical development
and clinical trials;

developing a sustainable and scalable manufacturing process for our product candidates, as well as establishing and maintaining
commercially viable supply relationships with third parties that can provide adequate products and services to support clinical activities and
commercial demand of our product candidates;

identifying, assessing, acquiring, and/or developing new product candidates;

negotiating favorable terms in any collaboration, licensing, or other arrangements into which we may enter;

launching and successfully commercializing product candidates for which we obtain regulatory and marketing approval, either by
collaborating with a partner or, if launched independently, by establishing a sales, marketing, and distribution infrastructure;

obtaining and maintaining an adequate price for our product candidates, both in the United States and in foreign countries where our products
are commercialized;

obtaining adequate reimbursement for our product candidates from payors;

obtaining market acceptance of our product candidates as viable treatment options;

addressing any competing technological and market developments;

receiving milestones and other payments under our current and any future collaboration arrangements;

maintaining, protecting, expanding, and enforcing our portfolio of intellectual property rights, including patents, trade secrets, and know-
how; and

attracting, hiring, and retaining qualified personnel.

Because of the numerous risks and uncertainties associated with drug development, we are unable to predict the timing or amount of our expenses, or

when we will be able to generate any meaningful revenue or achieve or maintain profitability, if ever. In addition, our expenses could increase beyond our
current expectations if we are required by the FDA or foreign regulatory agencies, to perform studies in addition to those that we currently anticipate, or if
there are any delays in any of our or our future collaborators’ clinical trials or the development of any of our product candidates. Even if one or more of our
product candidates is approved for commercial sale, we anticipate incurring significant costs associated with launching and commercializing any approved
product candidate and ongoing compliance efforts.

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We will need to obtain substantial additional financing to complete the development and any commercialization of our product candidates, and a failure
to obtain this necessary capital when needed on acceptable terms, or at all, could force us to delay, limit, reduce, or terminate our commercialization
efforts, product development, or other operations.

Our operations have required substantial amounts of cash since inception, and we expect our expenses to increase significantly in the foreseeable

future. To date, we have financed our operations primarily through the sale of equity securities and through our government grant and upfront payments
received in connection with our collaboration arrangement with AbbVie. Developing our product candidates and conducting clinical trials for the treatment of
neurodegenerative diseases, including FTD, Alzheimer’s disease, and Parkinson’s disease, will require substantial amounts of capital. We will also require a
significant amount of capital to commercialize any approved products.

As of December 31, 2018, we had cash, cash equivalents, and marketable securities of $290.4 million. In February 2019, we received $168.2 million
of net proceeds from the issuance of common stock upon the completion of our initial public offering (IPO), net of underwriting discounts and commissions
and estimated offering expenses. Based on our current operating plan, we believe that our existing cash, cash equivalents, and marketable securities will be
sufficient to fund our projected operations through at least the next 12 months. Our estimate as to how long we expect our existing cash, cash equivalents, and
marketable securities to be available to fund our operations is based on assumptions that may be proved inaccurate, and we could use our available capital
resources sooner than we currently expect. In addition, changing circumstances may cause us to increase our spending significantly faster than we currently
anticipate, and we may need to spend more money than currently expected because of circumstances beyond our control. We may need to raise additional
funds sooner than we anticipate if we choose to expand more rapidly than we presently anticipate.

We will require additional capital for the further development and, if approved, commercialization of our product candidates. Additional capital may
not be available when we need it, on terms acceptable to us or at all. We have no committed source of additional capital. If adequate capital is not available to
us on a timely basis, we may be required to significantly delay, scale back, or discontinue our research and development programs or the commercialization of
any product candidates, if approved, or be unable to continue or expand our operations, or otherwise capitalize on our business opportunities, as desired,
which could materially affect our business, financial condition, results of operations, and growth prospects and cause the price of our common stock to
decline.

To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our stockholders will

be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a common stockholder. Debt
financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional
debt, making capital expenditures, or declaring dividends. If we raise additional funds through collaborations, strategic alliances, or licensing arrangements
with pharmaceutical partners, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs, or product
candidates, or grant licenses on terms that may not be favorable to us.

Due to the significant resources required for the development of our programs, and depending on our ability to access capital, we must prioritize
development of certain product candidates. Moreover, we may expend our limited resources on programs that do not yield a successful product candidate
or fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.

To date, we have identified over forty immune system targets. In the last five years, we have progressed over ten programs into preclinical research.
By the end of 2019, we expect to have four product candidates in clinical trials. Together, the development of these programs and product candidates require
significant capital investment. Due to the significant resources required for the development of our programs and product candidates, we must focus our
programs and product candidates on specific diseases and disease pathways and decide which product candidates to pursue and advance and the amount of
resources to allocate to each. Our drug development strategy is to clinically test and seek regulatory approval for our product candidates in indications in
which we believe there is the most evidence that we will be able to quickly generate proof-of-concept data. We then intend to expand to clinical testing and
seek regulatory approvals in other neurodegenerative indications based on genetic and

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mechanistic overlap with the primary indication. However, even if our product candidates are able to gain regulatory approval in one indication, there is no
guarantee that we will be able to expand to other indications, and we may expend significant resources in seeking such approvals. In addition, we may focus
resources on pursuing indications outside of neurodegeneration based on the same genetic and mechanistic rationale we utilize in determining on which of our
discovery programs to focus. Our decisions concerning the allocation of research, development, collaboration, management, and financial resources toward
particular product candidates or therapeutic areas may not lead to the development of any viable commercial product and may divert resources away from
better opportunities. Similarly, our potential decisions to delay, terminate, or collaborate with third parties in respect of certain programs may subsequently
also prove to be suboptimal and could cause us to miss valuable opportunities. If we make incorrect determinations regarding the viability or market potential
of any of our programs or product candidates or misread trends in the biopharmaceutical industry, in particular for neurodegenerative diseases, our business,
financial condition, and results of operations could be materially adversely affected. As a result, we may fail to capitalize on viable commercial products or
profitable market opportunities, be required to forego or delay pursuit of opportunities with other product candidates or other diseases and disease pathways
that may later prove to have greater commercial potential than those we choose to pursue, or relinquish valuable rights to such product candidates through
collaboration, licensing, or other royalty arrangements in cases in which it would have been advantageous for us to invest additional resources to retain sole
development and commercialization rights.

Risks Related to the Discovery, Development, and Commercialization of Our Product Candidates

Research and development of biopharmaceutical products is inherently risky. Our business is heavily dependent on the successful development of our
product candidates, which are in the early stages of preclinical and clinical development. We cannot give any assurance that any of our product
candidates will receive regulatory, including marketing, approval, which is necessary before they can be commercialized.

We are at the early stages of development of the product candidates currently in our programs. To date, we have invested substantially all of our

efforts and financial resources to identify, procure intellectual property for, and develop our programs, including conducting preclinical studies and clinical
trials in our programs for our product candidates, AL001, AL002, AL003, and AL101, and providing general and administrative support for these operations.
Our future success is dependent on our ability to successfully develop, obtain regulatory approval for, and then successfully commercialize our product
candidates, and we may fail to do so for many reasons, including the following:

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our product candidates may not successfully complete preclinical studies or clinical trials;

a product candidate may on further study be shown to have harmful side effects or other characteristics that indicate it is unlikely to be
effective or otherwise does not meet applicable regulatory criteria;

our competitors may develop therapeutics that render our product candidates obsolete or less attractive;

the product candidates that we develop may not be sufficiently covered by intellectual property for which we hold exclusive rights;

the product candidates that we develop may be covered by third parties’ patents or other intellectual property or exclusive rights;

the market for a product candidate may change so that the continued development of that product candidate is no longer reasonable or
commercially attractive;

a product candidate may not be capable of being produced in commercial quantities at an acceptable cost, or at all;

if a product candidate obtains regulatory approval, we may be unable to establish sales and marketing capabilities, or successfully market
such approved product candidate, to gain market acceptance; and

a product candidate may not be accepted as safe and effective by patients, the medical community or third-party payors, if applicable.

If any of these events occur, we may be forced to abandon our development efforts for a program or programs, which would have a material adverse

effect on our business and could potentially cause us to cease operations.

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We may not be successful in our efforts to further develop our current product candidates. We are not permitted to market or promote any of our

product candidates before we receive regulatory approval from the FDA or comparable foreign regulatory authorities, and we may never receive such
regulatory approval for any of our product candidates. Each of our product candidates is in the early stages of development and will require significant
additional clinical development, management of preclinical, clinical, and manufacturing activities, regulatory approval, adequate manufacturing supply, a
commercial organization, and significant marketing efforts before we generate any revenue from product sales, if at all.

We have never completed a clinical development program. We currently have two product candidates, AL001 and AL002 in Phase 1 clinical trials.

None of our product candidates have advanced into late-stage development or a pivotal clinical trial and it may be years before any such trial is initiated, if at
all. Further, we cannot be certain that any of our product candidates will be successful in clinical trials. We may in the future advance product candidates into
clinical trials and terminate such trials prior to their completion.

If any of our product candidates successfully complete clinical trials, we generally plan to seek regulatory approval to market our product candidates

in the United States, the European Union, and in additional foreign countries where we believe there is a viable commercial opportunity. We have never
commenced, compiled or submitted an application seeking regulatory approval to market any product candidate. We may never receive regulatory approval to
market any product candidates even if such product candidates successfully complete clinical trials, which would adversely affect our viability. To obtain
regulatory approval in countries outside the United States, we must comply with numerous and varying regulatory requirements of such other countries
regarding safety, efficacy, manufacturing and controls, clinical trials, commercial sales, pricing, and distribution of our product candidates. We may also rely
on our collaborators or partners to conduct the required activities to support an application for regulatory approval, and to seek approval, for one or more of
our product candidates. For example, for our AL002 and AL003 product candidates, our collaboration arrangement with AbbVie provides that we are
responsible for the execution of the Phase 1 and Phase 2 studies. We cannot be sure that our collaborators or partners will conduct these activities or do so
within the timeframe we desire. Even if we (or our collaborators or partners) are successful in obtaining approval in one jurisdiction, we cannot ensure that we
will obtain approval in any other jurisdictions. If we are unable to obtain approval for our product candidates in multiple jurisdictions, our business, financial
condition, results of operations, and our growth prospects could be negatively affected.

Even if we receive regulatory approval to market any of our product candidates, whether for the treatment of neurodegenerative diseases or other
diseases, we cannot assure you that any such product candidate will be successfully commercialized, widely accepted in the marketplace or more effective
than other commercially available alternatives.

Investment in biopharmaceutical product development involves significant risk that any product candidate will fail to demonstrate adequate efficacy

or an acceptable safety profile, gain regulatory approval, and become commercially viable. We cannot provide any assurance that we will be able to
successfully advance any of our product candidates through the development process or, if approved, successfully commercialize any of our product
candidates.

We may not be successful in our efforts to continue to create a pipeline of product candidates from our Discovery Platform or to develop commercially
successful products. If we fail to successfully identify and develop additional product candidates from our Discover Platform, our commercial opportunity
may be limited.

One of our strategies is to identify and pursue clinical development of additional product candidates. Our Discovery Platform has helped us identify

over forty immune system targets. In the last five years, we have progressed over ten programs into early preclinical development. By the end of 2019, we
expect to advance four product candidates into clinical trials. Identifying, developing, obtaining regulatory approval, and commercializing additional product
candidates for the treatment of neurodegenerative diseases will require substantial additional funding and is prone to the risks of failure inherent in drug
development. We cannot provide you any assurance that we will be able to successfully identify or acquire additional product candidates, advance any of
these additional product candidates through the development process, successfully commercialize any such additional product candidates, if approved, or
assemble sufficient resources to identify, acquire, develop, or, if approved,

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commercialize additional product candidates. If we are unable to successfully identify, acquire, develop, and commercialize additional product candidates, our
commercial opportunity may be limited.

We may not be successful in our efforts to expand indications for approved product candidates.

Our drug development strategy is to clinically test and seek regulatory approval for our product candidates in indications in which we believe there is
the most evidence that we will be able to quickly generate proof-of-concept data. We then intend to expand to clinical testing and seek regulatory approvals in
other neurodegenerative indications based on genetic and mechanistic overlap with the primary indication. Conducting clinical trials for additional indications
for our product candidates requires substantial technical, financial, and human resources and is prone to the risks of failure inherent in drug development. We
cannot provide you any assurance that we will be successful in our effort to obtain regulatory approval for our product candidates for additional indications
even if we obtain approval for an initial indication.

For example, our product candidate AL001 is initially targeting FTD-GRN. Following proof-of-concept data in FTD-GRN patients, we plan to

expand AL001 to other indications associated with decreased levels of PGRN. If we are unable to successfully identify, develop, obtain regulatory approval
for, and commercialize AL001 for other indications, our commercial opportunity for AL001 may be limited.

We have concentrated a substantial portion of our research and development efforts on the treatment of neurodegenerative diseases, a field that has seen
limited success in drug development. Further, our product candidates are based on new approaches and novel technology, which makes it difficult to
predict the time and cost of product candidate development and subsequently obtaining regulatory approval.

We have focused a substantial portion of our research and development efforts on addressing neurodegenerative diseases. Collectively, efforts by

biopharmaceutical companies in the field of neurodegenerative diseases have seen limited success in drug development. There are few effective therapeutic
options available for patients with FTD, Alzheimer’s disease, Parkinson’s disease, and other neurodegenerative diseases. Our future success is highly
dependent on the successful development of our product candidates for treating neurodegenerative diseases. Developing and, if approved, commercializing
our product candidates for treatment of neurodegenerative diseases subjects us to a number of challenges, including obtaining disease modifying activity and
efficacious dose in target tissue and obtaining regulatory approval from the FDA and other regulatory authorities who have only a limited set of precedents to
rely on.

Our approach to the treatment of neurodegenerative diseases aims to identify and select targets enriched in microglia and other myeloid immune cells

which are genetically associated with neurodegenerative diseases, identify and develop product candidates that cross the blood brain barrier in sufficient
quantity and potency to enable efficacious dosing in the brain and engage the intended target, identify and develop biomarkers that are signs of a disease or
condition, to select the right patient population, and to demonstrate target engagement, pathway engagement, and impact on disease progression of our
product candidates. This strategy may not prove to be successful. We cannot be sure that our approach will yield satisfactory therapeutic products that are safe
and effective, scalable, or profitable.

We may encounter substantial delays in our clinical trials, or may not be able to conduct or complete our clinical trials on the timelines we expect, if at
all.

Clinical testing is expensive, time consuming, and subject to uncertainty. We cannot guarantee that any clinical trials will be conducted as planned or

completed on schedule, if at all. We cannot be sure that submission of an IND or a clinical trial application (CTA) will result in the FDA or EMA as
applicable, allowing clinical trials to begin in a timely manner, if at all. Moreover, even if these trials begin, issues may arise that could suspend or terminate
such clinical trials. A failure of one or more clinical trials can occur at any stage of testing, and our future clinical trials may not be successful. Events that
may prevent successful or timely initiation or completion of clinical trials include:

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delays in confirming target engagement, patient selection, or other relevant biomarkers to be utilized in preclinical and clinical product
candidate development;

delays in reaching a consensus with regulatory agencies on study design;
delays in reaching agreement on acceptable terms with prospective contract research organizations (CROs) and clinical trial sites, the terms
of which can be subject to extensive negotiation and may vary significantly among different CROs and clinical trial sites;

delays in identifying, recruiting, and training suitable clinical investigators;

delays in obtaining required IRB approval at each clinical trial site;

imposition of a temporary or permanent clinical hold by regulatory agencies for a number of reasons, including:

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after review of an IND or amendment, CTA or amendment, or equivalent application or amendment;

as a result of a new safety finding that presents unreasonable risk to clinical trial participants;

a negative finding from an inspection of our clinical trial operations or study sites; or

the finding that the investigational protocol or plan is clearly deficient to meet its stated objectives;

delays in identifying, recruiting, and enrolling suitable patients to participate in our clinical trials, and delays caused by patients withdrawing
from clinical trials, or failing to return for post-treatment follow-up;

difficulty collaborating with patient groups and investigators;

failure by our CROs, other third parties, or us to adhere to clinical trial requirements;

failure to perform in accordance with the FDA’s or any other regulatory authority’s current good clinical practices (cGCPs) requirements, or
applicable EMA or other regulatory guidelines in other countries;

occurrence of adverse events associated with the product candidate that are viewed to outweigh its potential benefits;

changes in regulatory requirements and guidance that require amending or submitting new clinical protocols;

changes in the standard of care on which a clinical development plan was based, which may require new or additional trials;

the cost of clinical trials of our product candidates being greater than we anticipate;

clinical trials of our product candidates producing negative or inconclusive results, which may result in our deciding, or regulators requiring
us, to conduct additional clinical trials or abandon product development programs; and

delays in manufacturing, testing, releasing, validating, or importing/exporting sufficient stable quantities of our product candidates for use in
clinical trials or the inability to do any of the foregoing.

Any inability to successfully initiate or complete clinical trials could result in additional costs to us or impair our ability to generate revenue. In
addition, if we make manufacturing or formulation changes to our product candidates, we may be required to or we may elect to conduct additional studies to
bridge our modified product candidates to earlier versions. Clinical trial delays could also shorten any periods during which our products have patent
protection and may allow our competitors to bring products to market before we do, which could impair our ability to successfully commercialize our product
candidates and may harm our business and results of operations.

We could also encounter delays if a clinical trial is suspended or terminated by us, by the data safety monitoring board for such trial or by the FDA,

EMA, or any other regulatory authority, or if the IRBs of the institutions in which such trials are being conducted suspend or terminate the participation of
their clinical

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investigators and sites subject to their review. Such authorities may suspend or terminate a clinical trial due to a number of factors, including failure to
conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the
FDA, EMA, or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to
demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions, or lack of adequate funding to continue
the clinical trial.

We may in the future advance product candidates into clinical trials and terminate such trials prior to their completion, which could adversely affect

our business.

Delays in the completion of any clinical trial of our product candidates will increase our costs, slow down our product candidate development and

approval process and delay, or potentially jeopardize our ability to commence product sales and generate revenue. In addition, many of the factors that cause,
or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product
candidates.

We may encounter difficulties enrolling patients in our clinical trials, and our clinical development activities could thereby be delayed or otherwise
adversely affected.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of

patients who remain in the trial until its conclusion. We may experience difficulties in patient enrollment in our clinical trials for a variety of reasons,
including:

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the size and nature of the patient population;

the patient eligibility criteria defined in the protocol, including biomarker-driven identification and/or certain highly-specific criteria related
to stage of disease progression, which may limit the patient populations eligible for our clinical trials to a greater extent than competing
clinical trials for the same indication that do not have biomarker-driven patient eligibility criteria;

the size of the study population required for analysis of the trial’s primary endpoints;

the proximity of patients to a trial site;

the design of the trial;

our ability to recruit clinical trial investigators with the appropriate competencies and experience;

competing clinical trials for similar therapies or targeting patient populations meeting our patient eligibility criteria;

clinicians’ and patients’ perceptions as to the potential advantages and side effects of the product candidate being studied in relation to other
available therapies and product candidates;

our ability to obtain and maintain patient consents; and

the risk that patients enrolled in clinical trials will not complete such trials, for any reason.

Our clinical trials may reveal significant adverse events, toxicities, or other side effects and may fail to demonstrate substantial evidence of the safety and
efficacy of our product candidates, which would prevent, delay, or limit the scope of regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of any of our product candidates, we must demonstrate through lengthy, complex, and

expensive preclinical studies and clinical trials that our product candidates are both safe and effective for use in each target indication. For those product
candidates that are subject to regulation as biological drug products, we will need to demonstrate that they are safe, pure, and potent for use in their target
indications. Each product candidate must demonstrate an adequate risk versus benefit profile in its intended patient population and for its intended use.

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Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure can occur at any time during the

clinical trial process. The results of preclinical studies of our product candidates may not be predictive of the results of early-stage or later-stage clinical trials,
and results of early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. The results of clinical trials in one
set of patients or disease indications may not be predictive of those obtained in another. In some instances, there can be significant variability in safety or
efficacy results between different clinical trials of the same product candidate due to numerous factors, including changes in trial procedures set forth in
protocols, differences in the size and type of the patient populations, changes in and adherence to the dosing regimen, and other clinical trial protocols and the
rate of dropout among clinical trial participants. Open-label extension studies may also extend the timing and cost of a clinical test substantially. Product
candidates in later stages of clinical trials may fail to show the desired safety and efficacy profile despite having progressed through preclinical studies and
initial clinical trials. A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of
efficacy or unacceptable safety issues, notwithstanding promising results in earlier trials. This is particularly true in neurodegenerative diseases, where failure
rates historically have been higher than in many other disease areas. Most product candidates that begin clinical trials are never approved by regulatory
authorities for commercialization.

We have limited experience in designing clinical trials and may be unable to design and execute a clinical trial to support marketing approval. We

cannot be certain that our current clinical trials or any other future clinical trials will be successful. Additionally, any safety concerns observed in any one of
our clinical trials in our targeted indications could limit the prospects for regulatory approval of our product candidates in those and other indications, which
could have a material adverse effect on our business, financial condition, and results of operations. For instance, two subjects in our Phase 1 clinical trial of
AL001 experienced a severe adverse event of rhabdomyolysis, a muscle injury, which was deemed not drug related.

In addition, even if such clinical trials are successfully completed, we cannot guarantee that the FDA or foreign regulatory authorities will interpret

the results as we do, and more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not
satisfactory to the FDA or foreign regulatory authorities for support of a marketing application, we may be required to expend significant resources, which
may not be available to us, to conduct additional trials in support of potential approval of our product candidates. Even if regulatory approval is secured for
any of our product candidates, the terms of such approval may limit the scope and use of our product candidates, which may also limit its commercial
potential.

We face significant competition in an environment of rapid technological and scientific change, and there is a possibility that our competitors may
achieve regulatory approval before us or develop therapies that are safer, more advanced, or more effective than ours, which may negatively impact our
ability to successfully market or commercialize any product candidates we may develop and ultimately harm our financial condition.

The development and commercialization of new drug products is highly competitive. Moreover, the neurodegenerative field is characterized by
strong and increasing competition, and a strong emphasis on intellectual property. We may face competition with respect to any of our product candidates that
we seek to develop or commercialize in the future from major pharmaceutical companies, specialty pharmaceutical companies, and biotechnology companies
worldwide. Potential competitors also include academic institutions, government agencies, and other public and private research organizations that conduct
research, seek patent protection, and establish collaborative arrangements for research, development, manufacturing, and commercialization.

There are a number of large pharmaceutical and biotechnology companies that are currently pursuing the development of products for the treatment

of neurodegenerative diseases, including FTD and Alzheimer’s disease. Many of these current or potential competitors, either alone or with their strategic
partners, have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical
trials, obtaining regulatory approvals, and marketing approved products than we do. Mergers and acquisitions in the pharmaceutical and biotechnology
industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller or early-stage companies may also
prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These competitors also compete
with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial sites and patient registration for clinical trials,
as well as in acquiring technologies

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complementary to, or necessary for, our programs. Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize
products that are safer, more effective, have fewer or less severe side effects, are more convenient, or are less expensive than any products that we may
develop. Furthermore, currently approved products could be discovered to have application for treatment of neurodegenerative disease indications, which
could give such products significant regulatory and market timing advantages over any of our product candidates. Our competitors also may obtain FDA,
EMA, or other regulatory approval for their products more rapidly than we may obtain approval for ours and may obtain orphan drug exclusivity from the
FDA for indications our product candidates are targeting, which could result in our competitors establishing a strong market position before we are able to
enter the market. Additionally, products or technologies developed by our competitors may render our potential product candidates uneconomical or obsolete,
and we may not be successful in marketing any product candidates we may develop against competitors.

In addition, we could face litigation or other proceedings with respect to the scope, ownership, validity, and/or enforceability of our patents relating to

our competitors’ products and our competitors may allege that our products infringe, misappropriate, or otherwise violate their intellectual property. The
availability of our competitors’ products could limit the demand, and the price we are able to charge, for any products that we may develop and
commercialize.

The manufacture of our product candidates is complex, and we may encounter difficulties in production. If we or any of our third-party manufacturers
encounter such difficulties, or fail to meet rigorously enforced regulatory standards, our ability to provide supply of our product candidates for clinical
trials or our products for patients, if approved, could be delayed or stopped, or we may be unable to maintain a commercially viable cost structure.

The processes involved in manufacturing our drug and biological product candidates are complex, expensive, highly-regulated, and subject to
multiple risks. Further, as product candidates are developed through preclinical studies to late-stage clinical trials towards approval and commercialization, it
is common that various aspects of the development program, such as manufacturing methods, are altered along the way in an effort to optimize processes and
results. Such changes carry the risk that they will not achieve these intended objectives, and any of these changes could cause our product candidates to
perform differently and affect the results of planned clinical trials or other future clinical trials.

In order to conduct clinical trials of our product candidates, or supply commercial products, if approved, we will need to manufacture them in large

quantities. Our CDMOs may be unable to successfully increase the manufacturing capacity for any of our product candidates in a timely or cost-effective
manner, or at all. In addition, quality issues may arise during scale-up activities. If our CDMOs are unable to successfully scale up the manufacture of our
product candidates in sufficient quality and quantity, the development, testing, and clinical trials of that product candidate may be delayed or become
infeasible, and regulatory approval or commercial launch of any resulting product may be delayed or not obtained, which could significantly harm our
business. The same risk would apply to our internal manufacturing facilities, should we in the future decide to build internal manufacturing capacity. In
addition, building internal manufacturing capacity would carry significant risks in terms of being able to plan, design, and execute on a complex project to
build manufacturing facilities in a timely and cost-efficient manner.

In addition, the manufacturing process for any products that we may develop is subject to FDA, EMA, and foreign regulatory authority approval

processes, and continuous oversight, and we will need to contract with manufacturers who can meet all applicable FDA, EMA, and foreign regulatory
authority requirements, including complying with current good manufacturing practices (cGMPs) on an ongoing basis. If we or our third-party manufacturers
are unable to reliably produce products to specifications acceptable to the FDA, EMA, or other regulatory authorities, we may not obtain or maintain the
approvals we need to commercialize such products. Even if we obtain regulatory approval for any of our product candidates, there is no assurance that either
we or our CDMOs will be able to manufacture the approved product to specifications acceptable to the FDA, EMA, or other regulatory authorities, to produce
it in sufficient quantities to meet the requirements for the potential launch of the product, or to meet potential future demand. Any of these challenges could
delay completion of clinical trials, require bridging clinical trials or the repetition of one or more clinical trials, increase clinical trial costs, delay approval of
our product candidate, impair commercialization efforts, increase our cost of goods, and have an adverse effect on our business, financial condition, results of
operations, and growth prospects.

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If, in the future, we are unable to establish sales and marketing capabilities or enter into agreements with third parties to sell and market any product
candidates we may develop, we may not be successful in commercializing those product candidates if and when they are approved.

We do not have a sales or marketing infrastructure and have no experience in the sale, marketing, or distribution of pharmaceutical products. To

achieve commercial success for any approved product for which we retain sales and marketing responsibilities, we must either develop a sales and marketing
organization or outsource these functions to third parties. In the future, we may choose to build a focused sales, marketing, and commercial support
infrastructure to sell, or participate in sales activities with our collaborators for, some of our product candidates if and when they are approved.

There are risks involved with both establishing our own commercial capabilities and entering into arrangements with third parties to perform these

services. For example, recruiting and training a sales force or reimbursement specialists is expensive and time consuming and could delay any product launch.
If the commercial launch of a product candidate for which we recruit a sales force and establish marketing and other commercialization capabilities is delayed
or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses. This may be costly, and our
investment would be lost if we cannot retain or reposition our commercialization personnel.

Factors that may inhibit our efforts to commercialize any approved product on our own include:

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our inability to recruit and retain adequate numbers of effective sales, marketing, reimbursement, customer service, medical affairs, and other
support personnel;

the inability of sales personnel to obtain access to physicians or persuade adequate numbers of physicians to prescribe any future approved
products;

the inability of reimbursement professionals to negotiate arrangements for formulary access, reimbursement, and other acceptance by payors;

the inability to price our products at a sufficient price point to ensure an adequate and attractive level of profitability;

restricted or closed distribution channels that make it difficult to distribute our products to segments of the patient population;

the lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies
with more extensive product lines; and

unforeseen costs and expenses associated with creating an independent commercialization organization.

If we enter into arrangements with third parties to perform sales, marketing, commercial support, and distribution services, our product revenue or the

profitability of product revenue may be lower than if we were to market and sell any products we may develop ourselves. In addition, we may not be
successful in entering into arrangements with third parties to commercialize our product candidates or may be unable to do so on terms that are favorable to
us. We may have little control over such third parties, and any of them may fail to devote the necessary resources and attention to sell and market our products
effectively. If we do not establish commercialization capabilities successfully, either on our own or in collaboration with third parties, we will not be
successful in commercializing our product candidates if approved.

Even if any product candidates we develop receive marketing approval, they may fail to achieve the degree of market acceptance by physicians, patients,
healthcare payors, and others in the medical community necessary for commercial success.

The commercial success of any of our product candidates will depend upon its degree of market acceptance by physicians, patients, third-party

payors, and others in the medical community. Even if any product candidates we may develop receive marketing approval, they may nonetheless fail to gain
sufficient market acceptance by physicians, patients, healthcare payors, and others in the medical community. The degree of market acceptance of

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any product candidates we may develop, if approved for commercial sale, will depend on a number of factors, including:

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the efficacy and safety of such product candidates as demonstrated in clinical trials and published in peer-reviewed journals;

the potential and perceived advantages compared to alternative treatments;

the ability to offer our products for sale at competitive prices;

sufficient third-party coverage or reimbursement;

the ability to offer appropriate patient access programs, such as co-pay assistance;

the extent to which physicians recommend our products to their patients;

convenience and ease of dosing and administration compared to alternative treatments;

the clinical indications for which the product candidate is approved by FDA, EMA, or other regulatory agencies;

product labeling or product insert requirements of the FDA, EMA, or other comparable foreign regulatory authorities, including any
limitations, contraindications, or warnings contained in a product’s approved labeling;

restrictions on how the product is distributed;

the timing of market introduction of competitive products;

publicity concerning our products or competing products and treatments;

the strength of marketing and distribution support; and

the prevalence and severity of any side effects.

If any product candidates we develop do not achieve an adequate level of acceptance, we may not generate significant product revenue, and we may

not become profitable.

Any products we commercialize may become subject to unfavorable pricing regulations, third-party reimbursement practices, or healthcare reform
initiatives, which would harm our business.

The regulations that govern marketing approvals, pricing, and reimbursement for new drugs vary widely from country to country. In the United

States, recently enacted legislation may significantly change the approval requirements in ways that could involve additional costs and cause delays in
obtaining approvals. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period
begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing
governmental control even after initial approval is granted. As a result, we might obtain marketing approval for a product in a particular country, but then be
subject to price regulations that delay our commercial launch of the product, possibly for lengthy time periods, and negatively impact the revenue we are able
to generate from the sale of the product in that country. Adverse pricing limitations may hinder our ability to recoup our investment in one or more product
candidates, even if any product candidates we may develop obtain marketing approval.

Our ability to successfully commercialize any products that we may develop also will depend in part on the extent to which reimbursement for these

products and related treatments will be available from government health administration authorities, private health insurers, and other organizations.
Government authorities and third-party payors, such as private health insurers and health maintenance organizations, decide which medications they will pay
for and establish reimbursement levels. A primary trend in the U.S. healthcare industry and elsewhere is cost containment. Government authorities and third-
party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications. Government authorities
currently impose mandatory discounts for certain patient groups, such as Medicare, Medicaid and Veterans Affairs hospitals, and may seek to increase such
discounts at any time. Future regulation may negatively impact the price of our products, if approved.

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Increasingly, third-party payors are requiring that drug companies provide them with predetermined discounts from list prices and are challenging the prices
charged for medical products. We cannot be sure that reimbursement will be available for any product candidate that we commercialize and, if reimbursement
is available, the level of reimbursement. Reimbursement may impact the demand for, or the price of, any product candidate for which we obtain marketing
approval. In order to get reimbursement, physicians may need to show that patients have superior treatment outcomes with our products compared to standard
of care drugs, including lower-priced generic versions of standard of care drugs. If reimbursement is not available or is available only to limited levels, we
may not be able to successfully commercialize any product candidate for which we obtain marketing approval. In the United States, no uniform policy of
coverage and reimbursement for products exists among third-party payors and coverage and reimbursement levels for products can differ significantly from
payor to payor. As a result, the coverage determination process is often a time consuming and costly process that may require us to provide scientific and
clinical support for the use of our products to each payor separately, with no assurance that coverage and adequate reimbursement will be applied consistently
or obtained in the first instance.

There may be significant delays in obtaining reimbursement for newly approved drugs, and coverage may be more limited than the purposes for
which the medicine is approved by the FDA, EMA, or other comparable foreign regulatory authorities. Moreover, eligibility for reimbursement does not
imply that any drug will be paid for in all cases or at a rate that covers our costs, including research, development, manufacture, sale, and distribution. Interim
reimbursement levels for new drugs, if applicable, may also not be sufficient to cover our costs and may not be made permanent. Reimbursement rates may
vary according to the use of the drug and the clinical setting in which it is used, may be based on reimbursement levels already set for lower cost drugs and
may be incorporated into existing payments for other services. Net prices for drugs may be reduced by mandatory discounts or rebates required by
government healthcare programs or private payors and by any future relaxation of laws that presently restrict imports of drugs from countries where they may
be sold at lower prices than in the United States. Third-party payors often rely upon Medicare coverage policy and payment limitations in setting their own
reimbursement policies. Our inability to promptly obtain coverage and profitable payment rates from both government-funded and private payors for any
approved products we may develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize product
candidates, and our overall financial condition.

Our product candidates for which we intend to seek approval may face competition sooner than anticipated.

Even if we are successful in achieving regulatory approval to commercialize a product candidate ahead of our competitors, our product candidates

may face competition from biosimilar products. In the United States, our product candidates are regulated by the FDA as biologic products and we intend to
seek approval for these product candidates pursuant to the BLA pathway. The Biologics Price Competition and Innovation Act of 2009 (BPCIA) created an
abbreviated pathway for the approval of biosimilar and interchangeable biologic products. The abbreviated regulatory pathway establishes legal authority for
the FDA to review and approve biosimilar biologics, including the possible designation of a biosimilar as “interchangeable” based on its similarity to an
existing brand product. Under the BPCIA, an application for a biosimilar product cannot be approved by the FDA until 12 years after the original branded
product was approved under a BLA. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact,
implementation, and meaning are subject to uncertainty. While it is uncertain when such processes intended to implement BPCIA may be fully adopted by the
FDA, any such processes could have a material adverse effect on the future commercial prospects for our product candidates.

We believe that any of our product candidates approved as a biologic product under a BLA should qualify for the 12-year period of exclusivity.
However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, or that the FDA will not consider our product
candidates to be reference products for competing products, potentially creating the opportunity for generic competition sooner than anticipated. Moreover,
the extent to which a biosimilar product, once approved, will be substituted for any one of our reference products in a way that is similar to traditional generic
substitution for non-biologic products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing. In addition,
a competitor could decide to forego the biosimilar approval path and submit a full BLA after completing its own preclinical studies and clinical trials. In such
cases, any exclusivity to which we may be eligible under the BPCIA would not prevent the competitor from marketing its product as soon as it is approved.

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In Europe, the European Commission has granted marketing authorizations for several biosimilar products pursuant to a set of general and product

class-specific guidelines for biosimilar approvals issued over the past few years. In Europe, a competitor may reference data supporting approval of an
innovative biological product, but will not be able to get it on the market until 10 years after the time of approval of the innovative product. This 10-year
marketing exclusivity period will be extended to 11 years if, during the first eight of those 10 years, the marketing authorization holder obtains an approval
for one or more new therapeutic indications that bring significant clinical benefits compared with existing therapies. In addition, companies may be
developing biosimilar products in other countries that could compete with our products, if approved.

If competitors are able to obtain marketing approval for biosimilars referencing our product candidates, if approved, such products may become

subject to competition from such biosimilars, with the attendant competitive pressure and potential adverse consequences. Such competitive products may be
able to immediately compete with us in each indication for which our product candidates may have received approval.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product
candidates.

We face an inherent risk of product liability as a result of the clinical testing of our product candidates and will face an even greater risk when and if
we commercialize any products. For example, we may be sued if our product candidates cause or are perceived to cause injury or are found to be otherwise
unsuitable during clinical testing, manufacturing, marketing, or sale. Any such product liability claims may include allegations of defects in manufacturing,
defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability, or a breach of warranties. Claims could also be asserted
under state consumer protection acts. If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be
required to limit testing and commercialization of our product candidates. Even successful defense would require significant financial and management
resources. Regardless of the merits or eventual outcome, liability claims may result in:

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decreased or interrupted demand for our products;

injury to our reputation;

withdrawal of clinical trial participants and inability to continue clinical trials;

initiation of investigations by regulators;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

product recalls, withdrawals or labeling, marketing, or promotional restrictions;

loss of revenue;

exhaustion of any available insurance and our capital resources; and

the inability to commercialize any product candidate.

Our inability to obtain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or

inhibit the commercialization of products we develop, alone or with collaborators. Our insurance policies may have various exclusions, and we may be
subject to a product liability claim for which we have no coverage. We may have to pay any amounts awarded by a court or negotiated in a settlement that
exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts.
Even if our agreements with any future corporate collaborators entitle us to indemnification against losses, such indemnification may not be available or
adequate should any claim arise.

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Risks Related to Regulatory Approval and Other Legal Compliance Matters

The regulatory approval processes of the FDA, EMA, and comparable foreign regulatory authorities are lengthy, time consuming, and inherently
unpredictable. If we are ultimately unable to obtain regulatory approval for our product candidates, we will be unable to generate product revenue and
our business will be substantially harmed.

The time required to obtain approval by the FDA, EMA, and comparable foreign regulatory authorities is unpredictable, typically takes many years

following the commencement of clinical trials, and depends upon numerous factors, including the type, complexity, and novelty of the product candidates
involved. In addition, approval policies, regulations, or the type and amount of clinical data necessary to gain approval may change during the course of a
product candidate’s clinical development and may vary among jurisdictions, which may cause delays in the approval or the decision not to approve an
application. Regulatory authorities have substantial discretion in the approval process and may refuse to accept any application or may decide that our data
are insufficient for approval and require additional preclinical, clinical, or other studies. We have not submitted for, or obtained regulatory approval for any
product candidate, and it is possible that none of our existing product candidates or any product candidates we may seek to develop in the future will ever
obtain regulatory approval.

Further, development of our product candidates and/or regulatory approval may be delayed for reasons beyond our control. For example, a U.S.

federal government shutdown or budget sequestration, such as ones that occurred during 2013, 2018, and 2019, may result in significant reductions to the
FDA’s budget, employees, and operations, which may lead to slower response times and longer review periods, potentially affecting our ability to progress
development of our product candidates or obtain regulatory approval for our product candidates.

Applications for our product candidates could fail to receive regulatory approval in an initial or subsequent indication for many reasons, including but

not limited to the following:

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the FDA, EMA, or comparable foreign regulatory authorities may disagree with the design, implementation, or results of our clinical trials;

the FDA, EMA, or comparable foreign regulatory authorities may determine that our product candidates are not safe and effective, only
moderately effective or have undesirable or unintended side effects, toxicities, or other characteristics that preclude our obtaining marketing
approval or prevent or limit commercial use;

the population studied in the clinical program may not be sufficiently broad or representative to assure efficacy and safety in the full
population for which we seek approval;

we may be unable to demonstrate to the FDA or comparable foreign regulatory authorities that a product candidate’s risk-benefit ratio when
compared to the standard of care is acceptable;

the FDA, EMA, or comparable foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical
trials;

the data collected from clinical trials of our product candidates may not be sufficient to support the submission of a NDA, BLA, or other
submission or to obtain regulatory approval in the United States or elsewhere;

we may be unable to demonstrate to the FDA, EMA, or comparable foreign regulatory authorities that a product candidate’s risk-benefit ratio
for a proposed indication is acceptable;

the FDA, EMA, or comparable foreign regulatory authorities may fail to approve the manufacturing processes, test procedures, and
specifications, or facilities of third-party manufacturers with which we contract for clinical and commercial supplies; and

the approval policies or regulations of the FDA, EMA, or comparable foreign regulatory authorities may significantly change in a manner
rendering our clinical data insufficient for approval.

This lengthy approval process, as well as the unpredictability of the results of clinical trials, may result in our failing to obtain regulatory approval to

market any of our product candidates, which would significantly harm our business, results of operations, and prospects.

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Our product candidates may cause undesirable side effects or have other properties that could halt their clinical development, prevent their regulatory
approval, limit their commercial potential, or result in significant negative consequences.

Adverse events or other undesirable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay, or halt

clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA, EMA, or other comparable foreign
regulatory authorities.

Drug-related side effects could affect patient recruitment, the ability of enrolled patients to complete the study, and/or result in potential product

liability claims. We are required to maintain product liability insurance pursuant to certain of our development and commercialization agreements. We may
not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability. A successful product
liability claim or series of claims brought against us could adversely affect our results of operations, business, and reputation. In addition, regardless of merit
or eventual outcome, product liability claims may result in impairment of our business reputation, withdrawal of clinical trial participants, costs due to related
litigation, distraction of management’s attention from our primary business, initiation of investigations by regulators, substantial monetary awards to patients
or other claimants, the inability to commercialize our product candidates, and decreased demand for our product candidates, if approved for commercial sale.

Additionally, if one or more of our product candidates receives marketing approval, and we or others later identify undesirable side effects or adverse

events caused by such products, a number of potentially significant negative consequences could result, including but not limited to:

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regulatory authorities may withdraw approvals of such product and cause us to recall our products;

regulatory authorities may require additional warnings on the label;

we may be required to change the way the product is administered or conduct additional clinical trials or post-approval studies;

we may be required to create a Risk Evaluation and Mitigation Strategy plan, which could include a medication guide outlining the risks of
such side effects for distribution to patients, a communication plan for healthcare providers, and/or other elements, such as boxed warning on
the packaging, to assure safe use;

we could be sued and held liable for harm caused to patients; and

our reputation may suffer.

Any of these events could prevent us from achieving or maintaining market acceptance of the particular product candidate, if approved, and could

significantly harm our business, financial condition, results of operations, and growth prospects.

We may in the future conduct clinical trials for our product candidates outside the United States, and the FDA, EMA, and applicable foreign regulatory
authorities may not accept data from such trials.

We may in the future choose to conduct one or more of our clinical trials outside the United States, including in Europe or Australia. The acceptance
of study data from clinical trials conducted outside the United States or another jurisdiction by the FDA, EMA, or applicable foreign regulatory authority may
be subject to certain conditions. In cases where data from foreign clinical trials are intended to serve as the basis for marketing approval in the United States,
the FDA will generally not approve the application on the basis of foreign data alone unless (i) the data are applicable to the United States population and
United States medical practice; and (ii) the trials were performed by clinical investigators of recognized competence and pursuant to cGCP regulations.
Additionally, the FDA’s clinical trial requirements, including sufficient size of patient populations and statistical powering, must be met. Many foreign
regulatory bodies have similar approval requirements. In addition, such foreign trials would be subject to the applicable local laws of the foreign jurisdictions
where the trials are conducted. There can be no assurance that the FDA, EMA, or any applicable foreign regulatory authority will accept data from trials
conducted outside of the United States or the applicable jurisdiction. If the FDA, EMA, or any applicable foreign regulatory authority does not accept such
data, it would result in the need for additional trials, which would be costly and time-

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consuming and delay aspects of our business plan, and which may result in our product candidates not receiving approval or clearance for commercialization
in the applicable jurisdiction.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not mean that we will be successful in obtaining
regulatory approval of our product candidates in other jurisdictions.

Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not guarantee that we will be able to obtain or
maintain regulatory approval in any other jurisdiction, but a failure or delay in obtaining regulatory approval in one jurisdiction may have a negative effect on
the regulatory approval process in others. For example, even if the FDA or EMA grants marketing approval of a product candidate, comparable regulatory
authorities in foreign jurisdictions must also approve the manufacturing, marketing, and promotion of the product candidate in those countries. Approval
procedures vary among jurisdictions and can involve requirements and administrative review periods different from those in the United States, including
additional preclinical studies or clinical trials as clinical trials conducted in one jurisdiction may not be accepted by regulatory authorities in other
jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in
that jurisdiction. In some cases, the price that we intend to charge for our products is also subject to approval.

Obtaining foreign regulatory approvals and compliance with foreign regulatory requirements could result in significant delays, difficulties, and costs

for us and could delay or prevent the introduction of our products in certain countries. If we or any partner we work with fail to comply with the regulatory
requirements in international markets or fail to receive applicable marketing approvals, our target market will be reduced, and our ability to realize the full
market potential of our product candidates will be harmed.

Even if we obtain regulatory approval for a product candidate, our products will remain subject to extensive regulatory scrutiny.

If any of our product candidates are approved, they will be subject to ongoing regulatory requirements for manufacturing, labeling, packaging,
storage, advertising, promotion, sampling, record-keeping, conduct of post-marketing studies, and submission of safety, efficacy, and other post-market
information, including both federal and state requirements in the United States and requirements of comparable foreign regulatory authorities.

Manufacturers and manufacturers’ facilities are required to comply with extensive requirements imposed by the FDA, EMA, and comparable foreign

regulatory authorities, including ensuring that quality control and manufacturing procedures conform to cGMP regulations. As such, we and our contract
manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any NDA, BLA,
or marketing authorization application (MAA). Accordingly, we and others with whom we work must continue to expend time, money, and effort in all areas
of regulatory compliance, including manufacturing, production, and quality control.

Any regulatory approvals that we receive for our product candidates will be subject to limitations on the approved indicated uses for which the
product may be marketed and promoted or to the conditions of approval (including the requirement to implement a Risk Evaluation and Mitigation Strategy),
or contain requirements for potentially costly post-marketing testing. We will be required to report certain adverse reactions and production problems, if any,
to the FDA, EMA, and comparable foreign regulatory authorities. Any new legislation addressing drug safety issues could result in delays in product
development or commercialization, or increased costs to assure compliance. The FDA and other agencies, including the Department of Justice, closely
regulate and monitor the post-approval marketing and promotion of products to ensure that they are manufactured, marketed, and distributed only for the
approved indications and in accordance with the provisions of the approved labeling. We will have to comply with requirements concerning advertising and
promotion for our products. Promotional communications with respect to prescription drugs are subject to a variety of legal and regulatory restrictions and
must be consistent with the information in the product’s approved label. As such, we may not promote our products for indications or uses for which they do
not have approval. The holder of an approved NDA, BLA, or MAA must submit new or supplemental applications and obtain approval for certain changes to
the approved product, product labeling, or manufacturing process. We could also be asked to conduct post-marketing clinical trials to verify the safety and

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efficacy of our products in general or in specific patient subsets. If original marketing approval was obtained via the accelerated approval pathway, we could
be required to conduct a successful post-marketing clinical trial to confirm clinical benefit for our products. An unsuccessful post-marketing study or failure
to complete such a study could result in the withdrawal of marketing approval.

If a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or

problems with the facility where the product is manufactured, or disagrees with the promotion, marketing or labeling of a product, such regulatory agency
may impose restrictions on that product or us, including requiring withdrawal of the product from the market. If we fail to comply with applicable regulatory
requirements, a regulatory agency or enforcement authority may, among other things:

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issue warning letters that would result in adverse publicity;

impose civil or criminal penalties;

suspend or withdraw regulatory approvals;

suspend any of our ongoing clinical trials;

refuse to approve pending applications or supplements to approved applications submitted by us;

impose restrictions on our operations, including closing our contract manufacturers’ facilities;

seize or detain products; or

require a product recall.

Any government investigation of alleged violations of law could require us to expend significant time and resources in response, and could generate

negative publicity. Any failure to comply with ongoing regulatory requirements may significantly and adversely affect our ability to commercialize and
generate revenue from our products. If regulatory sanctions are applied or if regulatory approval is withdrawn, the value of our company and our operating
results will be adversely affected.

We have received orphan drug designation from the FDA for AL001 for treatment of FTD and plan to seek orphan drug designation for some of our
other product candidates, but we may be unable to obtain such designations or to maintain the benefits associated with orphan drug status, including
market exclusivity, which may cause our revenue, if any, to be reduced.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a
disease or condition with a patient population of fewer than 200,000 in the United States, or a patient population greater than 200,000 in the United States
when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the United States will be recovered from
sales in the United States for that drug or biologic. Orphan drug designation must be requested before submitting an NDA or BLA. In the United States,
orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages, and user-fee
waivers. After the FDA grants orphan drug designation, the generic identity of the drug and its potential orphan use are disclosed publicly by the FDA.
Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process. While we have obtained
orphan drug designation from the FDA for AL001 for treatment of FTD, we may be unable to reap the benefits associated with orphan drug status. In
addition, we plan to seek orphan drug designations for some of our other product candidates in the future but may be unable to obtain an orphan drug
designation for any additional product candidates.

If a product that has orphan drug designation subsequently receives the first FDA approval for a particular active ingredient for the disease for which
it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other NDA or BLA applications
to market the same drug or biologic for the same indication for seven years, except in limited circumstances such as a showing of clinical superiority to the
product with orphan exclusivity or if FDA finds that the holder of the orphan exclusivity has not shown that it can assure the availability of sufficient
quantities of the orphan product to meet the needs of patients with the disease or condition for which the drug was designated. As a result, even though the
FDA has

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approved orphan drug status for AL001 for treatment of FTD, the FDA can still approve other drugs that have a different active ingredient for use in treating
the same indication or disease. Furthermore, the FDA can waive orphan exclusivity if we are unable to manufacture sufficient supply of our product.

Healthcare legislative measures aimed at reducing healthcare costs may have a material adverse effect on our business and results of operations.

Third-party payors, whether domestic or foreign, or governmental or commercial, are developing increasingly sophisticated methods of controlling
healthcare costs. In both the United States and certain foreign jurisdictions, there have been a number of legislative and regulatory changes to the healthcare
system that could impact our ability to sell our products profitably. In particular, in 2010, the ACA was enacted, which, among other things, subjected
biologic products to potential competition by lower-cost biosimilars, addressed a new methodology by which rebates owed by manufacturers under the
Medicaid Drug Rebate Program are calculated for drugs that are inhaled, infused, instilled, implanted, or injected, increased the minimum Medicaid rebates
owed by most manufacturers under the Medicaid Drug Rebate Program, extended the Medicaid Drug Rebate Program to utilization of prescriptions of
individuals enrolled in Medicaid managed care organizations, subjected manufacturers to new annual fees and taxes for certain branded prescription drugs,
and provided incentives to programs that increase the federal government’s comparative effectiveness research. Recent changes in the U.S. administration
could lead to repeal of or changes in some or all of the ACA, and complying with any new legislation or reversing changes implemented under the ACA
could be time-intensive and expensive, resulting in a material adverse effect on our business. Until the ACA is fully implemented or there is more certainty
concerning the future of the ACA, it will be difficult to predict its full impact and influence on our business.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal, and state levels directed at containing or

lowering the cost of healthcare. We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance
companies, managed care organizations, and other payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may
adversely affect:

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the demand for our product candidates, if we obtain regulatory approval;

our ability to receive or set a price that we believe is fair for our products;

our ability to generate revenue and achieve or maintain profitability;

the level of taxes that we are required to pay; and

the availability of capital.

We expect that the ACA, as well as other healthcare reform measures that may be adopted in the future, may result in additional reductions in
Medicare and other healthcare funding, more rigorous coverage criteria, lower reimbursement, and new payment methodologies. This could lower the price
that we receive for any approved product. Any denial in coverage or reduction in reimbursement from Medicare or other government-funded programs may
result in a similar denial or reduction in payments from private payors, which may prevent us from being able to generate sufficient revenue, attain
profitability, or commercialize our product candidates, if approved.

Our employees, independent contractors, consultants, commercial partners, and vendors may engage in misconduct or other improper activities,
including noncompliance with regulatory standards and requirements.

We are exposed to the risk of fraud, misconduct, or other illegal activity by our employees, independent contractors, consultants, commercial

partners, and vendors. Misconduct by these parties could include intentional, reckless, and negligent conduct that fails to:

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comply with the laws of the FDA, EMA, and other comparable foreign regulatory authorities;

provide true, complete, and accurate information to the FDA, EMA, and other comparable foreign regulatory authorities;

comply with manufacturing standards we have established;

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comply with healthcare fraud and abuse laws in the United States and similar foreign fraudulent misconduct laws; or

report financial information or data accurately or to disclose unauthorized activities to us.

If we obtain FDA approval of any of our product candidates and begin commercializing those products in the United States, our potential exposure
under such laws will increase significantly, and our costs associated with compliance with such laws are also likely to increase. In particular, research, sales,
marketing, education, and other business arrangements in the healthcare industry are subject to extensive laws designed to prevent fraud, kickbacks, self-
dealing, and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, educating, marketing and
promotion, sales and commission, certain customer incentive programs, and other business arrangements generally. Activities subject to these laws also
involve the improper use of information obtained in the course of patient recruitment for clinical trials, which could result in regulatory sanctions and cause
serious harm to our reputation. We have adopted a code of business conduct and ethics, but it is not always possible to identify and deter misconduct by
employees and third parties, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks
or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws. If any
such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on
our business, including the imposition of significant fines or other sanctions.

If we fail to comply with healthcare laws, we could face substantial penalties and our business, operations, and financial conditions could be adversely
affected.

If we obtain FDA approval for any of our product candidates and begin commercializing those products in the United States, our operations will be

subject to various federal and state fraud and abuse laws. The laws that may impact our operations include the following:

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The federal Anti-Kickback Statute, prohibits, among other things, persons from knowingly and willfully soliciting, receiving, offering, or
paying any remuneration (including any kickback, bribe, or rebate), directly or indirectly, overtly or covertly, in cash or in kind, to induce, or
in return for, either the referral of an individual, or the purchase, lease, order, or recommendation of any good, facility, item or service for
which payment may be made, in whole or in part, under a federal healthcare program, such as the Medicare and Medicaid programs. A
person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation. In
addition, the government may assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute
constitutes a false or fraudulent claim for purposes of the False Claims Act.

Federal civil and criminal false claims laws and civil monetary penalty laws, including the False Claims Act, impose criminal and civil
penalties, including through civil “qui tam” or “whistleblower” actions, against individuals or entities from knowingly presenting, or causing
to be presented, claims for payment or approval from Medicare, Medicaid, or other third-party payors that are false or fraudulent or
knowingly making a false statement to improperly avoid, decrease, or conceal an obligation to pay money to the federal government. Similar
to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of these statutes or specific intent to violate
them in order to have committed a violation.

The federal Health Insurance Portability and Accountability Act of 1996 (HIPAA) created new federal criminal statutes that prohibit
knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program or obtain, by means of false
or fraudulent pretenses, representations, or promises, any of the money or property owned by, or under the custody or control of, any
healthcare benefit program, regardless of the payor (e.g., public or private) and knowingly and willfully falsifying, concealing, or covering up
by any trick or device a material fact or making any materially false statements in connection with the delivery of, or payment for, healthcare
benefits, items or services relating to healthcare matters.

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 (HITECH) and their respective
implementing regulations, impose requirements on certain covered

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healthcare providers, health plans, and healthcare clearinghouses as well as their respective business associates that perform services for them
that involve the use, or disclosure of, individually identifiable health information, relating to the privacy, security, and transmission of
individually identifiable health information without appropriate authorization.

The federal Physician Payment Sunshine Act, created under the ACA, and its implementing regulations, require manufacturers of drugs,
devices, biologicals, and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance
Program to report annually to the U.S. Department of Health and Human Services under the Open Payments Program, information related to
payments or other transfers of value made to physicians and teaching hospitals, as well as ownership and investment interests held by
physicians and their immediate family members.

Federal consumer protection and unfair competition laws broadly regulate marketplace activities and activities that potentially harm
consumers.

Analogous state and foreign laws and regulations, such as state and foreign anti-kickback, false claims, consumer protection, and unfair
competition laws may apply to pharmaceutical business practices, including but not limited to, research, distribution, sales and marketing
arrangements, as well as submitting claims involving healthcare items or services reimbursed by any third-party payer, including commercial
insurers.

State laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines, and the relevant
compliance guidance promulgated by the federal government that otherwise restricts payments that may be made to healthcare providers and
other potential referral sources.

State laws also require drug manufacturers to file reports with states regarding pricing and marketing information, such as the tracking and
reporting of gifts, compensations and other remuneration, and items of value provided to healthcare professionals and entities.

State and foreign laws also govern the privacy and security of health information in certain circumstances, many of which differ from each
other in significant ways and may not have the same effect, thus complicating compliance efforts.

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Because of the breadth of these laws and the narrowness of the statutory exceptions and safe harbors available, it is possible that some of our business

activities could, despite our efforts to comply, be subject to challenge under one or more of such laws. Efforts to ensure that our business arrangements will
comply with applicable healthcare laws may involve substantial costs. It is possible that governmental and enforcement authorities will conclude that our
business practices may not comply with current or future statutes, regulations or case law interpreting applicable fraud and abuse or other healthcare laws and
regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a
significant impact on our business, including the imposition of civil, criminal, and administrative penalties, damages, disgorgement, monetary fines, possible
exclusion from participation in Medicare, Medicaid, and other federal healthcare programs, contractual damages, reputational harm, diminished profits and
future earnings, and curtailment of our operations, any of which could adversely affect our ability to operate our business and our results of operations. In
addition, the approval and commercialization of any of our product candidates outside the United States will also likely subject us to foreign equivalents of
the healthcare laws mentioned above, among other foreign laws.

If we or any contract manufacturers and suppliers we engage fail to comply with environmental, health, and safety laws and regulations, we could
become subject to fines or penalties or incur costs that could have a material adverse effect on our business.

We and any contract manufacturers and suppliers we engage are subject to numerous federal, state, and local environmental, health, and safety laws,
regulations, and permitting requirements, including those governing laboratory procedures; the generation, handling, use, storage, treatment, and disposal of
hazardous and regulated materials and wastes; the emission and discharge of hazardous materials into the ground, air, and water; and employee health and
safety. Our operations involve the use of hazardous and flammable materials, including chemicals and biological and radioactive materials. Our operations
also produce hazardous waste. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of

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contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable
for any resulting damages, and any liability could exceed our resources. Under certain environmental laws, we could be held responsible for costs relating to
any contamination at our current or past facilities and at third-party facilities. We also could incur significant costs associated with civil or criminal fines and
penalties.

Compliance with applicable environmental laws and regulations may be expensive, and current or future environmental laws and regulations may

impair our research, product development, and manufacturing efforts. In addition, we cannot entirely eliminate the risk of accidental injury or contamination
from these materials or wastes. Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to
our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not carry
specific biological or hazardous waste insurance coverage, and our property, casualty, and general liability insurance policies specifically exclude coverage
for damages and fines arising from biological or hazardous waste exposure or contamination. Accordingly, in the event of contamination or injury, we could
be held liable for damages or be penalized with fines in an amount exceeding our resources, and our clinical trials or regulatory approvals could be suspended,
which could have a material adverse effect on our business, financial condition, results of operations, and prospects.
Inadequate funding for the FDA and other government agencies could hinder our ability to hire and retain key leadership and other personnel, prevent
new products and services from being developed or commercialized in a timely manner or otherwise prevent those agencies from performing normal
business functions on which the operation of our business may rely, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels,
ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the agency
have fluctuated in recent years as a result. In addition, government funding of other government agencies on which our operations may rely, including those
that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary government

agencies, which would adversely affect our business. For example, over the last several years, including in December 2018 and January 2019, the U.S.
government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical FDA and other government
employees and stop critical activities. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA to timely review and
process our regulatory submissions, which could have a material adverse effect on our business. Further, in our operations as a public company, future
government shutdowns could impact our ability to access the public markets and obtain necessary capital in order to properly capitalize and continue our
operations.

Our business activities may be subject to the Foreign Corrupt Practices Act (FCPA) and similar anti-bribery and anti-corruption laws.

Our business activities may be subject to the FCPA and similar anti-bribery or anti-corruption laws, regulations or rules of other countries in which

we operate, including the U.K. Bribery Act. The FCPA generally prohibits offering, promising, giving, or authorizing others to give anything of value, either
directly or indirectly, to a non-U.S. government official in order to influence official action, or otherwise obtain or retain business. The FCPA also requires
public companies to make and keep books and records that accurately and fairly reflect the transactions of the corporation and to devise and maintain an
adequate system of internal accounting controls. Our business is heavily regulated and therefore involves significant interaction with public officials,
including officials of non-U.S. governments. Additionally, in many other countries, the healthcare providers who prescribe pharmaceuticals are employed by
their government, and the purchasers of pharmaceuticals are government entities; therefore, our dealings with these prescribers and purchasers are subject to
regulation under the FCPA. Recently the SEC and Department of Justice have increased their FCPA enforcement activities with respect to biotechnology and
pharmaceutical companies. There is no certainty that all of our employees, agents, contractors, or collaborators, or

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those of our affiliates, will comply with all applicable laws and regulations, particularly given the high level of complexity of these laws. Violations of these
laws and regulations could result in fines, criminal sanctions against us, our officers, or our employees, the closing down of our facilities, requirements to
obtain export licenses, cessation of business activities in sanctioned countries, implementation of compliance programs, and prohibitions on the conduct of
our business. Any such violations could include prohibitions on our ability to offer our products in one or more countries and could materially damage our
reputation, our brand, our international expansion efforts, our ability to attract and retain employees, and our business, prospects, operating results, and
financial condition.

Risks Related to Our Reliance on Third Parties

We expect to depend on collaborations with third parties for the research, development, and commercialization of certain of the product candidates we
may develop. If any such collaborations are not successful, we may not be able to realize the market potential of those product candidates.

We currently use and expect to continue to use third-party collaborators for the research, development, and commercialization of certain of the

product candidates we may develop. For example, we have entered into the AbbVie Agreement for the global development and potential commercialization
of AL002 and AL003. We also collaborate with Adimab and others to further our development of product candidates and to enhance our research efforts
directed to better understanding neurodegenerative diseases. For additional information on our relationships with AbbVie and Adimab, see the sections titled
“Business—Strategic Alliance with AbbVie” and “Business—Adimab Collaboration Agreement.” Our likely collaborators for any other collaboration
arrangements include large and mid-size pharmaceutical companies, regional and national pharmaceutical companies, biotechnology companies, and
academic institutions. Such arrangements with any third parties, generally provide us with shared or limited control over the amount and timing of resources
that our collaborators dedicate to the development or potential commercialization of any product candidates we may seek to develop with them. Our ability to
generate revenue from these arrangements with commercial entities will depend on our collaborators’ abilities to successfully perform the functions assigned
to them in these arrangements. We cannot predict the success of any collaboration that we enter into.

Collaborations involving our research programs, or any product candidates we may develop, pose the following risks to us:

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collaborators generally have significant discretion in determining the efforts and resources that they will apply to these collaborations;

collaborators may not properly obtain, maintain, enforce, or defend intellectual property or proprietary rights relating to our product
candidates or research programs or may use our proprietary information in such a way as to expose us to potential litigation or other
intellectual property related proceedings, including proceedings challenging the scope, ownership, validity, and enforceability of our
intellectual property;

collaborators may own or co-own intellectual property covering our product candidates or research and development programs that results
from our collaboration with them, and in such cases, we may not have the exclusive right to commercialize such intellectual property or such
product candidates or research programs;

we may need the cooperation of our collaborators to enforce or defend any intellectual property we contribute to or that arises out of our
collaborations, which may not be provided to us;

collaborators may control certain interactions with regulatory authorities, which may impact our ability to obtain and maintain regulatory
approval of our product candidates;

disputes may arise between the collaborators and us that result in the delay or termination of the research, development, or commercialization
of our product candidates or research programs or that result in costly litigation or arbitration that diverts management attention and
resources;

collaborators may decide to not pursue development and commercialization of any product candidates we develop or may elect not to
continue or renew development or commercialization programs based on clinical trial results, changes in the collaborator’s strategic focus or
available funding or external factors

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such as an acquisition that diverts resources or creates competing priorities or collaborators may elect to fund or commercialize a competing
product;

collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product
candidate, repeat or conduct new clinical trials, or require a new formulation of a product candidate for clinical testing;

collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our product
candidates or research programs if the collaborators believe that competitive products are more likely to be successfully developed or can be
commercialized under terms that are more economically attractive than ours;

collaborators may restrict us from researching, developing, or commercializing certain products or technologies without their involvement;

collaborators with marketing and distribution rights to one or more product candidates may not commit sufficient resources to the marketing
and distribution of such product candidates;

we may lose certain valuable rights under circumstances identified in our collaborations, including if we undergo a change of control;

collaborators may grant sublicenses to our technology or product candidates or undergo a change of control, and the sublicensees or new
owners may decide to take the collaboration in a direction which is not in our best interest;  
collaborators may become bankrupt, which may significantly delay our research or development programs, or may cause us to lose access to
valuable technology, know-how, or intellectual property of the collaborator relating to our products, product candidates, or research
programs;

key personnel at our collaborators may leave, which could negatively impact our ability to productively work with our collaborators;

collaborations may require us to incur short and long-term expenditures, issue securities that dilute our stockholders, or disrupt our
management and business;

if our collaborators do not satisfy their obligations under our agreements with them, or if they terminate our collaborations with them, we
may not be able to develop or commercialize product candidates as planned;

collaborations may require us to share in development and commercialization costs pursuant to budgets that we do not fully control, and our
failure to share in such costs could have a detrimental impact on the collaboration or our ability to share in revenue generated under the
collaboration;

collaborations may be terminated in their entirety or with respect to certain product candidates or technologies and, if so terminated, may
result in a need for additional capital to pursue further development or commercialization of the applicable product candidates or
technologies; and

collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all. If a
present or future collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis on our development
or commercialization program under such collaboration could be delayed, diminished, or terminated.

We may face significant competition in seeking appropriate collaborations. Recent business combinations among biotechnology and pharmaceutical
companies have resulted in a reduced number of potential collaborators. In addition, the negotiation process is time-consuming and complex, and we may not
be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we are unable to do so, we may have to curtail the development of the
product candidate for which we are seeking to collaborate, reduce or delay its development program or one or more of our other development programs, delay
its potential commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or
commercialization activities at our own expense. If we elect to increase our expenditures to fund development or commercialization activities on our own, we
may need to obtain additional capital, which may not be available to us on acceptable terms or at all. If we do not have sufficient funds, we may not be able to
further develop product candidates or bring them to market and generate product revenue.

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We may not realize the benefit of collaborations if we or our collaborator elects not to exercise the rights granted under the agreement or if we or our

collaborator are unable to successfully integrate a product candidate into existing operations and company culture. In addition, if our agreement with any of
our collaborators terminates, our access to technology and intellectual property licensed to us by that collaborator may be restricted or terminate entirely,
which may delay our continued development of our product candidates utilizing the collaborator’s technology or intellectual property or require us to stop
development of those product candidates completely. We may also find it more difficult to find a suitable replacement collaborator or attract new
collaborators, and our development programs may be delayed or the perception of us in the business and financial communities could be adversely affected.
Many of the risks relating to product development, regulatory approval, and commercialization described in this “Risk Factors” section also apply to the
activities of our collaborators and any negative impact on our collaborators may adversely affect us.

We expect to rely on third parties to conduct our clinical trials and some aspects of our research and preclinical testing, and those third parties may not
perform satisfactorily, including failing to meet deadlines for the completion of such trials, research, or testing.

We currently rely and expect to continue to rely on third parties, such as CROs, clinical data management organizations, medical institutions, and
clinical investigators, to conduct some aspects of our research and preclinical testing and our clinical trials. Any of these third parties may terminate their
engagements with us or be unable to fulfill their contractual obligations. If we need to enter into alternative arrangements, it would delay our product
development activities.

Our reliance on these third parties for research and development activities reduces our control over these activities but does not relieve us of our

responsibilities. For example, we remain responsible for ensuring that each of our clinical trials is conducted in accordance with the general investigational
plan and protocols for the trial. Moreover, the FDA requires us to comply with cGCPs for conducting, recording, and reporting the results of clinical trials to
assure that data and reported results are credible, reproducible, and accurate and that the rights, integrity, and confidentiality of trial participants are protected.
We also are required to register ongoing clinical trials and post the results of completed clinical trials on a government-sponsored database within certain
timeframes. Failure to do so can result in fines, adverse publicity, and civil and criminal sanctions.

If these third parties do not successfully carry out their contractual duties, meet expected deadlines, or conduct our clinical trials in accordance with

regulatory requirements or our stated protocols, we will not be able to obtain, or may be delayed in obtaining, marketing approvals for any product candidates
we may develop and will not be able to, or may be delayed in our efforts to, successfully commercialize our medicines.

We also expect to rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our
distributors, including with the shipment of any drug supplies, could delay clinical development or marketing approval of any product candidates we may
develop or commercialization of our medicines, producing additional losses and depriving us of potential product revenue.

We contract with third parties for the manufacture of materials for our research programs, preclinical studies, clinical trials, and for commercialization
of any product candidates that we may develop. This reliance on third parties carries and may increase the risk that we will not have sufficient quantities
of such materials, product candidates, or any medicines that we may develop and commercialize, or that such supply will not be available to us at an
acceptable cost, which could delay, prevent, or impair our development or commercialization efforts.

We do not have any manufacturing facilities. We currently rely on CDMOs for the manufacture of our materials for preclinical studies and clinical
trials and expect to continue to do so for preclinical studies, clinical trials, and for commercial supply of any product candidates that we may develop. We
currently have established relationships with several CDMOs for the manufacturing of our product candidates, including Lonza Biologics for the
manufacturing of AL001 and AL002, Celonic AG for the manufacturing of AL003, and EMD Millipore Corporation for the manufacturing of AL101.

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We may be unable to establish any further agreements with CDMOs or to do so on acceptable terms. Even if we are able to establish agreements with

third-party manufacturers, reliance on CDMOs entails additional risks, including:

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the possible breach of the manufacturing agreement by the third party;

the possible termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us;

reliance on the third party for regulatory compliance, quality assurance, safety, and pharmacovigilance and related reporting; and

the inability to produce required volume in a timely manner and to quality standards.

Third-party manufacturers may not be able to comply with cGMP regulations or similar regulatory requirements outside the United States. Our

failure, or the failure of our CDMOs, to comply with applicable regulations could result in clinical holds on our trials, sanctions being imposed on us,
including fines, injunctions, civil penalties, delays, suspension or withdrawal of approvals, license revocations, seizures, or recalls of product candidates or
medicines, operating restrictions, and criminal prosecutions, any of which could significantly and adversely affect supplies of our medicines and harm our
business, financial condition, results of operations, and prospects.

Any medicines that we may develop may compete with other product candidates and products for access to manufacturing facilities. There are a

limited number of manufacturers that operate under cGMP regulations and that might be capable of manufacturing for us.

Any performance failure on the part of our existing or future third-party manufacturers could delay clinical development or marketing approval. If

any one of our current contract manufacturers cannot perform as agreed, we may be required to replace that manufacturer and may incur added costs and
delays in identifying and qualifying any such replacement. Furthermore, securing and reserving production capacity with contract manufacturers may result in
significant costs.

Our current and anticipated future dependence upon others for the manufacture of any product candidates we may develop or medicines may
adversely affect our future profit margins and our ability to commercialize any medicines that receive marketing approval on a timely and competitive basis.

We depend on third-party suppliers for key raw materials used in our manufacturing processes, and the loss of these third-party suppliers or their
inability to supply us with adequate raw materials could harm our business.

We rely on third-party suppliers for the supply of the raw materials required for the production of our product candidates, and we expect to continue
to rely on third-party manufacturers for the commercial supply of any of our product candidates for which we obtain marketing approval. Our dependence on
these third-party suppliers and the challenges we may face in obtaining adequate supplies of raw materials involve several risks, including limited control
over pricing, availability, quality, and delivery schedules. As a small company, our negotiation leverage is limited, and we are likely to get lower priority than
our competitors who are larger than we are. We do not have long-term supply agreements, and we purchase our required drug product on a development
manufacturing services agreement or purchase order basis. We cannot be certain that our suppliers will continue to provide us with the quantities of these raw
materials that we require or satisfy our anticipated specifications and quality requirements. Any supply interruption in limited or sole sourced raw materials
could materially harm our ability to manufacture our product candidates until a new source of supply, if any, could be identified and qualified. We may be
unable to find a sufficient alternative supply channel in a reasonable time or on commercially reasonable terms. Any performance failure on the part of our
suppliers could delay the development and potential commercialization of our product candidates, including limiting supplies necessary for clinical trials and
regulatory approvals, which would have a material adverse effect on our business.

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Risks Related to Our Intellectual Property

If we are unable to obtain and maintain patent protection for any product candidates we develop, our competitors could develop and commercialize
products similar or identical to ours, and our ability to successfully commercialize any product candidates we may develop may be adversely affected.

Our success depends in large part on our ability to obtain and maintain patent protection in the United States and other countries with respect to our

proprietary product candidates and other technologies we may develop. We seek to protect our proprietary position by filing patent applications in the United
States and abroad relating to our core programs and product candidates, as well as other technologies that are important to our business. Given that the
development of our product candidates is at an early stage, our intellectual property portfolio with respect to certain aspects of our product candidates is also
at an early stage. For example, we have filed or intend to file patent applications on aspects of our technology and core product candidates; however, there can
be no assurance that any such patent applications will issue as granted patents. Furthermore, in some cases, we have only filed provisional patent applications
on certain aspects of our technology and product candidates and each of these provisional patent applications is not eligible to become an issued patent until,
among other things, we file a non-provisional patent application within 12 months of the filing date of the applicable provisional patent application. Any
failure to file a non-provisional patent application within this timeline could cause us to lose the ability to obtain patent protection for the inventions disclosed
in the associated provisional patent applications. Furthermore, in some cases, we may not be able to obtain issued claims covering compositions relating to
our core programs and product candidates, as well as other technologies that are important to our business, and instead may need to rely on filing patent
applications with claims covering a method of use and/or method of manufacture for protection of such core programs, product candidates, and other
technologies. There can be no assurance that any such patent applications will issue as granted patents, and even if they do issue, such patent claims may be
insufficient to prevent third parties, such as our competitors, from utilizing our technology. Any failure to obtain or maintain patent protection with respect to
our core programs and product candidates could have a material adverse effect on our business, financial condition, results of operations, and prospects.

If any of our patent applications, or those of our collaborators, do not issue as patents in any jurisdiction, we may not be able to compete effectively.

Changes in either the patent laws or their interpretation in the United States and other countries may diminish our ability to protect our inventions,

obtain, maintain, and enforce our intellectual property rights and, more generally, could affect the value of our intellectual property or narrow the scope of our
patents or those of our collaborators with respect to our product candidates. With respect to both our intellectual property and that of our collaborators related
to our product candidates, we cannot predict whether the patent applications we and our collaborators are currently pursuing will issue as patents in any
particular jurisdiction or whether the claims of any issued patents will provide sufficient protection from competitors or other third parties.

The patent prosecution process is expensive, time-consuming, and complex, and we or our collaborators may not be able to file, prosecute, maintain,

enforce, or license all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify
patentable aspects of our research and development output in time to obtain patent protection. Although we enter into nondisclosure and confidentiality
agreements with parties who have access to confidential or patentable aspects of our research and development output, such as our employees, corporate
collaborators, outside scientific collaborators, CROs, CDMOs, consultants, advisors, and other third parties, any of these parties may breach the agreements
and disclose such output before a patent application is filed, thereby jeopardizing our ability to seek patent protection. In addition, our ability to obtain and
maintain valid and enforceable patents depends on whether the differences between our inventions and the prior art allow our inventions to be patentable over
the prior art. Furthermore, publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the United
States and other jurisdictions are typically not published until 18 months after filing, or in some cases not at all. Therefore, we cannot be certain that we or our
collaborators were the first to make the inventions claimed in any of our or our collaborators’ patents or pending patent applications, or that we or our
collaborators were the first to file for patent protection of such inventions.

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If the scope of any patent protection we obtain is not sufficiently broad, or if we lose any of our patent protection, our ability to prevent our competitors
from commercializing similar or identical technology and product candidates would be adversely affected.

The patent position of biotechnology and pharmaceutical companies generally is highly uncertain, involves complex legal and factual questions, and
has been the subject of much litigation in recent years. As a result, the issuance, scope, validity, enforceability, and commercial value of our patent rights are
highly uncertain. Our or our collaborators’ pending and future patent applications may not result in patents being issued which protect our product candidates
or other technologies or which effectively prevent others from commercializing competitive technologies and product candidates.

Moreover, the coverage claimed in a patent application can be significantly reduced before the patent is issued, and its scope can be reinterpreted after

issuance. Even if patent applications we or our collaborators license or own currently or in the future issue as patents, they may not issue in a form that will
provide us with any meaningful protection, prevent competitors or other third parties from competing with us, or otherwise provide us with any competitive
advantage. Any patents to which we or our collaborators have rights may be challenged, narrowed, circumvented, or invalidated by third parties.
Consequently, we do not know whether product candidates or other technologies will be protectable or remain protected by valid and enforceable patents. Our
competitors or other third parties may be able to circumvent our patents by developing similar or alternative technologies or products in a non-infringing
manner which could materially adversely affect our business, financial condition, results of operations and prospects.

The issuance of a patent is not conclusive as to its inventorship, scope, validity, or enforceability, and our patents may be challenged in the courts or

patent offices in the United States and abroad. We or our collaborators may be subject to a third-party preissuance submission of prior art to the USPTO or
become involved in opposition, derivation, revocation, reexamination, post-grant and inter partes review, or interference proceedings or other similar
proceedings challenging our or our collaborators’ patent rights. An adverse determination in any such submission, proceeding, or litigation could reduce the
scope of, or invalidate or render unenforceable, such patent rights, allow third parties to commercialize our product candidates or other technologies and
compete directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third-party patent
rights. Moreover, we, or one of our collaborators, may have to participate in interference proceedings declared by the USPTO to determine priority of
invention or in post-grant challenge proceedings, such as oppositions in a foreign patent office, that challenge our or our collaborators’ priority of invention or
other features of patentability with respect to our or our collaborators’ patents and patent applications. Such challenges may result in loss of patent rights, loss
of exclusivity, or in patent claims being narrowed, invalidated, or held unenforceable, which could limit our ability to stop others from using or
commercializing similar or identical technology and products, or limit the duration of the patent protection of our product candidates and other technologies.
Such proceedings also may result in substantial cost and require significant time from our scientists and management, even if the eventual outcome is
favorable to us. If we or our collaborators are unsuccessful in any such proceeding or other priority or inventorship dispute, we may be required to obtain and
maintain licenses from third parties, including parties involved in any such interference proceedings or other priority or inventorship disputes. Such licenses
may not be available on commercially reasonable terms or at all, or may be non-exclusive. If we are unable to obtain and maintain such licenses, we may
need to cease the development, manufacture, and commercialization of one or more of the product candidates we may develop. The loss of exclusivity or the
narrowing of our owned and licensed patent claims could limit our ability to stop others from using or commercializing similar or identical technology and
products.

In addition, given the amount of time required for the development, testing, and regulatory review of new product candidates, patents protecting such
product candidates might expire before or shortly after such product candidates are commercialized. As a result, our intellectual property may not provide us
with sufficient rights to exclude others from commercializing products similar or identical to ours.

Some of our patents and patent applications may in the future be co-owned with third parties. In addition, collaborators or future licensors may co-
own their patents and patent applications with other third parties with whom we do not have a direct relationship. Our rights to certain of these patents and
patent applications may be dependent, in part, on inter-institutional or other operating agreements between the joint owners of such patents and patent

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applications, who are not parties to our license agreements. If our collaborators or future licensors do not have exclusive control of the grant of licenses under
any such third-party co-owners’ interest in such patents or patent applications or we are otherwise unable to secure such exclusive rights, such co-owners may
be able to license their rights to other third parties, including our competitors, and our competitors could market competing products and technology to the
extent such products and technology are not also covered by our intellectual property. In addition, we may need the cooperation of any such co-owners of our
patents in order to enforce such patents against third parties, and such cooperation may not be provided to us. Any of the foregoing could have a material
adverse effect on our competitive position, business, financial conditions, results of operations, and prospects.

Our rights to develop and commercialize our product candidates are subject, in part, to the terms and conditions of agreements with others.

We are heavily reliant upon option rights to certain patent rights and proprietary technology from third parties that are important or necessary to the

development of our product candidates and are subject to the terms and conditions of certain collaboration agreements with third parties. For example, in
2013 we entered into the Adimab Collaboration Agreement with Adimab. Under the Adimab Collaboration Agreement, we are developing antibodies
discovered by Adimab in our AL001 and AL101 product candidates, and we are developing antibodies optimized by Adimab in our AL002 and AL003
product candidates. Additionally, in October 2017, we entered into the AbbVie Agreement to co-develop and commercialize medicines with AbbVie to treat
Alzheimer’s disease and other neurodegenerative diseases. For additional information on the Adimab Collaboration Agreement and the AbbVie Agreement,
see the sections titled “Business—Adimab Collaboration Agreement” and “Business—Strategic Alliance with AbbVie.”

Our agreements with Adimab and AbbVie and other agreements we enter into in the future may not provide exclusive rights to use certain intellectual

property and technology retained by the collaborator in all relevant fields of use and in all territories in which we may wish to develop or commercialize our
technology and products in the future. As a result, we may not be able to prevent competitors or other third parties from developing and commercializing
competitive products that utilizes technology retained by such collaborators to the extent such products are not also covered by our intellectual property.

In addition, subject to the terms of any such agreements, we do not have the right to control the preparation, filing, prosecution, and maintenance, and

we may not have the right to control the enforcement and defense of certain patents and patent applications retained by the collaborator and provided to us
under a limited license. For example, under the Adimab Collaboration Agreement, patent rights relating to improvements to Adimab’s background platform
technology that are invented in the course of the research under the Adimab Collaboration Agreement are assigned to Adimab. We also have an exclusive
option under the Adimab Collaboration Agreement to obtain with respect to a specified number of antibodies directed against such target and discovered or
optimized by Adimab, ownership of certain patent rights relating to such antibodies, including certain patent rights. Until we exercise such option, we and
Adimab each grant each other a non-exclusive license to the relevant intellectual property. We cannot be certain that patents and patent applications that are
controlled by our collaborators will be prepared, filed, prosecuted, maintained, enforced, and defended in a manner consistent with the best interests of our
business. If our collaborators fail to prosecute, maintain, enforce, and defend such patents, or lose rights to those patents or patent applications, the limited
rights we have licensed may be reduced or eliminated, our right to develop and commercialize any of our product candidates that are subject of such licensed
rights could be adversely affected, and we may have a reduced ability to prevent competitors from making, using, and selling competing products. In addition,
even where we have the right to control patent prosecution of patents and patent applications we have licensed to and from collaborators, we may still be
adversely affected or prejudiced by actions or inactions of our collaborators that took place prior to the date upon which we assumed control over patent
prosecution.

Furthermore, our or our collaborators’ patents may be subject to a reservation of rights by one or more third parties. For example, we received an

award from the National Institute of Health in support of our research into the production and characterization of novel therapeutic antibodies against SORT1.
As a result, the U.S. government may have certain rights to resulting intellectual property. When new technologies are developed with U.S. government
funding, the U.S. government generally obtains certain rights in any resulting patents, including a non-exclusive license authorizing the U.S. government to
use the invention or to have others use the invention on its behalf. The U.S. government’s rights may also permit it to disclose the funded inventions and
technology to third

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parties and to exercise march-in rights to use or allow third parties to use the technology developed using U.S. government funding. The U.S. government
may exercise its march-in rights if it determines that action is necessary because we fail to achieve the practical application of the government funded
technology, or because action is necessary to alleviate health or safety needs, to meet requirements of federal regulations, or to give preference to U.S.
industry. In addition, our rights in such inventions may be subject to certain requirements to manufacture products embodying such inventions in facilities in
the United States in certain circumstances and if this requirement is not waived. Any exercise by the U.S. government of such rights or by any third party of
its reserved rights could have a material adverse effect on our competitive position, business, financial condition, results of operations, and prospects.

If we fail to comply with our obligations in the agreements under which we option or license intellectual property rights from our collaborators or future
licensors or otherwise experience disruptions to our business relationships with our collaborators or future licensors, we could lose intellectual property
rights that are important to our business.

We have entered into agreements with our collaborators to option or license certain intellectual property and may need to obtain additional
intellectual property rights from others to advance our research or allow commercialization of product candidates we may develop. It is possible that we may
be unable to obtain additional intellectual property rights at a reasonable cost or on reasonable terms, if at all. In that event, we may be required to expend
significant time and resources to redesign our technology, product candidates, or the methods for manufacturing them or to develop or license replacement
technology, all of which may not be feasible on a technical or commercial basis. If we are unable to do so, we may be unable to develop or commercialize the
affected product candidates, which could harm our business, financial condition, results of operations, and prospects significantly. We cannot provide any
assurances that third-party patents do not exist which might be enforced against our current technology, manufacturing methods, product candidates, or future
methods or products resulting in either an injunction prohibiting our manufacture or future sales, or, with respect to our future sales, an obligation on our part
to pay royalties and/or other forms of compensation to third parties, which could be significant.

In addition, each of our agreements with collaborators do, and we expect our future agreements will, impose various economic, development,
diligence, commercialization, and other obligations on us. Certain of our collaboration agreements also require us to meet development timelines, or to
exercise commercially reasonable efforts to develop and commercialize licensed products. In spite of our efforts, our collaborators might conclude that we
have materially breached our obligations under such agreements and might therefore terminate or seek damages under the agreements, thereby removing or
limiting our ability to develop and commercialize products and technology covered by these agreements. If termination of these agreements causes us to lose
the rights to certain patents or other intellectual property, or if the underlying patents fail to provide the intended exclusivity, competitors or other third parties
may have the freedom to seek regulatory approval of, and to market, products similar to or identical to ours and we may be required to cease our development
and commercialization of certain of our product candidates. Any of the foregoing could have a material adverse effect on our competitive position, business,
financial conditions, results of operations, and growth prospects.

Moreover, disputes may arise regarding intellectual property subject to a collaboration agreement, including:

•

•

•

•

•

•

the scope of the option or license rights granted under the agreement and other interpretation-related issues;

the extent to which our technology and processes infringe on intellectual property of the collaborator that is not subject to the option or
license rights granted under the agreement;

the sublicensing of patent and other rights under our collaborative development relationships;

our diligence obligations under the agreement and what activities satisfy those diligence obligations;

the inventorship and ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our
collaborators and us and our other partners; and

the priority of invention of patented technology.

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In addition, the agreements under which we currently have rights to option or license intellectual property or technology from third parties are
complex, and certain provisions in such agreements may be susceptible to multiple interpretations. The resolution of any contract interpretation disagreement
that may arise could narrow what we believe to be the scope of our rights to the relevant intellectual property or technology, or increase what we believe to be
our financial or other obligations under the relevant agreement, either of which could have a material adverse effect on our business, financial condition,
results of operations, and growth prospects. Moreover, if disputes over intellectual property that we have optioned or licensed prevent or impair our ability to
maintain our current arrangements on commercially acceptable terms, we may be unable to successfully develop and commercialize the affected product
candidates, which could have a material adverse effect on our business, financial conditions, results of operations, and growth prospects.

We may not be able to protect our intellectual property and proprietary rights throughout the world.

Filing, prosecuting, and defending patents on our product candidates and other technologies in all countries throughout the world would be

prohibitively expensive, and the laws of foreign countries may not protect our rights to the same extent as the laws of the United States.

Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or

importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions
where we have not obtained patent protection to develop their own products, and, further, may export otherwise infringing products to territories where we
have patent protection but enforcement is not as strong as that in the United States. These products may compete with our products, and our patents or other
intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal

systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets, and other intellectual property
protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of our patents or marketing of
competing products in violation of our intellectual property and proprietary rights generally. Proceedings to enforce our intellectual property and proprietary
rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at
risk of being invalidated or interpreted narrowly, could put our patent applications at risk of not issuing, and could provoke third parties to assert claims
against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful.
Accordingly, our efforts to enforce our intellectual property and proprietary rights around the world may be inadequate to obtain a significant commercial
advantage from the intellectual property that we develop or license.

Many countries have compulsory licensing laws under which a patent owner may be compelled to grant licenses to third parties. In addition, many
countries limit the enforceability of patents against government agencies or government contractors. In these countries, the patent owner may have limited
remedies, which could materially diminish the value of such patent. If we, our collaborators or any of our future licensors is forced to grant a license to third
parties with respect to any patents relevant to our business, our competitive position may be impaired, and our business, financial condition, results of
operations, and prospects may be adversely affected.

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment, and other
requirements imposed by government patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these
requirements.

Periodic maintenance fees, renewal fees, annuity fees, and various other government fees on patents and applications will be due to be paid to the
USPTO and various government patent agencies outside of the United States over the lifetime of our owned or licensed patents and applications. In certain
circumstances, we rely on our collaborators or licensing partners to pay these fees due to U.S. and non-U.S. patent agencies. The USPTO and various non-
U.S. government agencies require compliance with several procedural, documentary, fee payment, and other similar provisions during the patent application
process. We also are dependent on our collaborators or licensors to take the necessary action to comply with these requirements with respect to our licensed
intellectual

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property. In some cases, an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules. There are
situations, however, in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in a partial or complete loss of
patent rights in the relevant jurisdiction. In such an event, potential competitors might be able to enter the market with similar or identical products or
technology, which could have a material adverse effect on our business, financial condition, results of operations, and growth prospects.

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our products.

Changes in either the patent laws or interpretation of the patent laws in the United States could increase the uncertainties and costs surrounding the

prosecution of patent applications and the enforcement or defense of issued patents. Assuming that other requirements for patentability are met, prior to
March 2013, in the United States, the first to invent the claimed invention was entitled to the patent, while outside the United States, the first to file a patent
application was entitled to the patent. After March 2013, under the Leahy-Smith America Invents Act (the America Invents Act) enacted in September 2011,
the United States transitioned to a first inventor to file system in which, assuming that other requirements for patentability are met, the first inventor to file a
patent application will be entitled to the patent on an invention regardless of whether a third party was the first to invent the claimed invention. A third party
that files a patent application in the USPTO after March 2013, but before us could therefore be awarded a patent covering an invention of ours even if we had
made the invention before it was made by such third party. This will require us to be cognizant going forward of the time from invention to filing of a patent
application. Since patent applications in the United States and most other countries are confidential for a period of time after filing or until issuance, we
cannot be certain that we were the first to either (i) file any patent application related to our product candidates or other technologies or (ii) invent any of the
inventions claimed in our patents or patent applications.

The America Invents Act also includes a number of significant changes that affect the way patent applications will be prosecuted and also may affect

patent litigation. These include allowing third party submission of prior art to the USPTO during patent prosecution and additional procedures to attack the
validity of a patent by USPTO administered post-grant proceedings, including post-grant review, inter partes review, and derivation proceedings. Because of
a lower evidentiary standard in USPTO proceedings compared to the evidentiary standard in United States federal courts necessary to invalidate a patent
claim, a third party could potentially provide evidence in a USPTO proceeding sufficient for the USPTO to hold a claim invalid even though the same
evidence would be insufficient to invalidate the claim if first presented in a district court action. Accordingly, a third party may attempt to use the USPTO
procedures to invalidate our patent claims that would not have been invalidated if first challenged by the third party as a defendant in a district court action.
Therefore, the America Invents Act and its implementation could increase the uncertainties and costs surrounding the prosecution of our patent applications
and the enforcement or defense of our issued patents, all of which could have a material adverse effect on our business, financial condition, results of
operations, and prospects.

In addition, the patent positions of companies in the development and commercialization of pharmaceuticals are particularly uncertain. Recent U.S.
Supreme Court rulings have narrowed the scope of patent protection available in certain circumstances and weakened the rights of patent owners in certain
situations. This combination of events has created uncertainty with respect to the validity and enforceability of patents, once obtained. Depending on future
actions by the U.S. Congress, the federal courts, and the USPTO, the laws and regulations governing patents could change in unpredictable ways that could
have a material adverse effect on our existing patent portfolio and our ability to protect and enforce our intellectual property in the future.  

Issued patents covering our product candidates and other technologies could be found invalid or unenforceable if challenged in court or before
administrative bodies in the United States or abroad.

If we initiated legal proceedings against a third party to enforce a patent covering our product candidates or other technologies, the defendant could

counterclaim that such patent is invalid or unenforceable. In patent litigation in the United States, defendant counterclaims alleging invalidity or
unenforceability are commonplace. Grounds for a validity challenge could be an alleged failure to meet any of several statutory requirements, including lack
of novelty, obviousness, or non-enablement. Grounds for an unenforceability assertion could be an allegation that

75

 
someone connected with prosecution of the patent withheld relevant information from the USPTO, or made a misleading statement, during prosecution. Third
parties may raise claims challenging the validity or enforceability of our patents before administrative bodies in the United States or abroad, even outside the
context of litigation. Such mechanisms include re-examination, post-grant review, inter partes review, interference proceedings, derivation proceedings, and
equivalent proceedings in foreign jurisdictions (e.g., opposition proceedings). Such proceedings could result in the revocation of, cancellation of, or
amendment to our patents in such a way that they no longer cover our product candidates or other technologies. The outcome following legal assertions of
invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art,
of which we or our licensing partners and the patent examiner were unaware during prosecution. If a third party were to prevail on a legal assertion of
invalidity or unenforceability, we would lose at least part, and perhaps all, of the patent protection on our product candidates or other technologies. Such a
loss of patent protection would have a material adverse impact on our business, financial condition, results of operations, and growth prospects.

If we do not obtain patent term extension and data exclusivity for any product candidates we may develop, our business may be materially harmed.

Depending upon the timing, duration, and specifics of any FDA marketing approval of any product candidates we may develop, one or more of our

U.S. patents may be eligible for limited patent term extension under the Hatch-Waxman Act. The Hatch-Waxman Act permits a patent term extension of up to
five years as compensation for patent term lost during the FDA regulatory review process. A patent term extension cannot extend the remaining term of a
patent beyond a total of 14 years from the date of product approval, only one patent may be extended and only those claims covering the approved drug, a
method for using it, or a method for manufacturing it may be extended. Similar extensions as compensation for patent term lost during regulatory review
processes are also available in certain foreign countries and territories, such as in Europe under a Supplementary Patent Certificate. However, we may not be
granted an extension in the United States and/or foreign countries and territories because of, for example, failing to exercise due diligence during the testing
phase or regulatory review process, failing to apply within applicable deadlines, failing to apply prior to expiration of relevant patents, or otherwise failing to
satisfy applicable requirements. Moreover, the applicable time period or the scope of patent protection afforded could be less than we request. If we are
unable to obtain patent term extension or the term of any such extension is shorter than what we request, our competitors may obtain approval of competing
products following our patent expiration, and our business, financial condition, results of operations, and growth prospects could be materially harmed.

We may be subject to claims challenging the inventorship of our patents and other intellectual property.

We may be subject to claims that former employees, collaborators or other third parties have an interest in our patents, trade secrets, or other
intellectual property as an inventor or co-inventor. For example, we may have inventorship disputes arise from conflicting obligations of employees,
consultants, or others who are involved in developing our product candidates or other technologies. Litigation may be necessary to defend against these and
other claims challenging inventorship or ownership of our patents, trade secrets, or other intellectual property. If the defense of any such claims fails, in
addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, intellectual property
that is important to our product candidates and other technologies. Even if we are successful in defending against such claims, litigation could result in
substantial costs and be a distraction to management and other employees. Any of the foregoing could have a material adverse effect on our business,
financial condition, results of operations, and growth prospects.

If we are unable to protect the confidentiality of our trade secrets, our business and competitive position would be harmed.

In addition to seeking patents for our product candidates and other technologies, we also rely on trade secrets and confidentiality agreements to

protect our unpatented know-how, technology, and other proprietary information and to maintain our competitive position. We consider trade secrets and
know-how to be one of our primary sources of intellectual property. Trade secrets and know-how can be difficult to protect. We expect our trade secrets and
know-how to over time be disseminated within the industry through independent development, the publication of

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journal articles describing the methodology, and the movement of personnel from academic to industry scientific positions.

We seek to protect these trade secrets and other proprietary technology, in part, by entering into non-disclosure and confidentiality agreements with
parties who have access to them, such as our employees, corporate collaborators, outside scientific collaborators, CROs, CDMOs, consultants, advisors, and
other third parties. We also enter into confidentiality and invention or patent assignment agreements with our employees and consultants as well as train our
employees not to bring or use proprietary information or technology from former employers to us or in their work, and remind former employees when they
leave their employment of their confidentiality obligations. We cannot guarantee that we have entered into such agreements with each party that may have or
have had access to our trade secrets or proprietary technology and processes. Despite our efforts, any of these parties may breach the agreements and disclose
our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Enforcing a claim that a party
illegally disclosed or misappropriated a trade secret is difficult, expensive, and time-consuming, and the outcome is unpredictable. In addition, some courts
inside and outside the United States are less willing or unwilling to protect trade secrets. If any of our trade secrets were to be lawfully obtained or
independently developed by a competitor or other third party, we would have no right to prevent them from using that technology or information to compete
with us. If any of our trade secrets were to be disclosed to or independently developed by a competitor or other third party, our competitive position would be
materially and adversely harmed.

We may not be successful in obtaining, through acquisitions or otherwise, necessary rights to our product candidates or other technologies.

Many pharmaceutical companies, biotechnology companies, and academic institutions are competing with us in the field of neurodegeneration

therapy may have patents and have filed and are likely filing patent applications potentially relevant to our business. In order to avoid infringing these third-
party patents, we may find it necessary or prudent to obtain licenses to such patents from such third-party intellectual property holders. We may also require
licenses from third parties for certain technologies for use with future product candidates. In addition, with respect to any patents we co-own with third
parties, we may wish to obtain licenses to such co-owners’ interest to such patents. However, we may be unable to secure such licenses or otherwise acquire
any compositions, methods of use, processes, or other intellectual property rights from third parties that we identify as necessary for our future product
candidates. The licensing or acquisition of third-party intellectual property rights is a competitive area, and several more established companies may pursue
strategies to license or acquire third-party intellectual property rights that we may consider attractive or necessary. These established companies may have a
competitive advantage over us due to their size, capital resources, and greater clinical development and commercialization capabilities. In addition, companies
that perceive us to be a competitor may be unwilling to assign or license rights to us. We also may be unable to license or acquire third-party intellectual
property rights on terms that would allow us to make an appropriate return on our investment or at all. If we are unable to successfully obtain rights to
required third-party intellectual property rights or maintain the existing intellectual property rights we have, we may have to abandon development of the
relevant program or product candidate, which could have a material adverse effect on our business, financial condition, results of operations, and growth
prospects.

We may be subject to claims that our employees, consultants, or advisors have wrongfully used or disclosed alleged trade secrets of their current or former
employers or claims asserting ownership of what we regard as our own intellectual property.

Many of our employees, consultants, and advisors are currently or were previously employed at universities or other biotechnology or pharmaceutical

companies, including our competitors and potential competitors. Although we try to ensure that our employees, consultants, and advisors do not use the
proprietary information or know-how of others in their work for us, we may be subject to claims that we or these individuals have used or disclosed
intellectual property, including trade secrets or other proprietary information, of any such individual’s current or former employer. Litigation may be
necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual
property rights or personnel. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to
management.

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In addition, while it is our policy to require our employees and contractors who may be involved in the conception or development of intellectual
property to execute agreements assigning such intellectual property to us, we may be unsuccessful in executing such an agreement with each party who, in
fact, conceives or develops intellectual property that we regard as our own. The assignment of intellectual property rights may not be self-executing, or the
assignment agreements may be breached, and we may be forced to bring claims against third parties, or defend claims that they may bring against us, to
determine the ownership of what we regard as our intellectual property. Such claims could have a material adverse effect on our business, financial condition,
results of operations, and growth prospects.

Third-party claims of intellectual property infringement, misappropriation, or other violation against us or our collaborators may prevent or delay the
development and commercialization of our product candidates and other technologies.

The field of discovering treatments for neurodegenerative diseases is highly competitive and dynamic. Due to the focused research and development

that is taking place by several companies, including us and our competitors, in this field, the intellectual property landscape is in flux, and it may remain
uncertain in the future. Additionally, the technology used in our product candidates is still in its infancy and no products utilizing similar technology have yet
reached the market. As such, there may be significant intellectual property related litigation and proceedings relating to our, and other third party, intellectual
property and proprietary rights in the future.

Our commercial success depends in part on our and our collaborators’ ability to develop, manufacture, market, and sell any product candidates that
we develop and to use our proprietary technologies without infringing, misappropriating, and otherwise violating the patents and other intellectual property
rights of third parties. There is a substantial amount of complex litigation involving patents and other intellectual property rights in the biotechnology and
pharmaceutical industries, as well as administrative proceedings for challenging patents, including interference, derivation, and reexamination proceedings
before the USPTO or oppositions and other comparable proceedings in foreign jurisdictions. We may become party to, or threatened with, such actions in the
future, regardless of their merit. As discussed above, recently, due to changes in U.S. law referred to as patent reform, new procedures including inter partes
review and post-grant review have been implemented. As stated above, this reform adds uncertainty to the possibility of challenge to our patents in the future.

Numerous U.S. and foreign issued patents and pending patent applications owned by third parties exist in the fields in which we are developing our

product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our product candidates and
other technologies may give rise to claims of infringement of the patent rights of others. Although we believe that we do not infringe a valid claim of any
third party’s patents or other intellectual property, we cannot assure you that our product candidates and other technologies that we have developed, are
developing or may develop in the future will not infringe existing or future patents owned by third parties. We may not be aware of patents that have already
been issued and that a third party, for example, a competitor in the fields in which we are developing product candidates, and other technologies might assert
are infringed by our current or future product candidates or other technologies, including claims to compositions, formulations, methods of manufacture or
methods of use or treatment that cover our product candidates or other technologies. It is also possible that patents owned by third parties of which we are
aware, but which we do not believe are relevant to our product candidates or other technologies, could be found to be infringed by our product candidates or
other technologies. In addition, because patent applications can take many years to issue, there may be currently pending patent applications that may later
result in issued patents that our product candidates or other technologies may infringe.

Third parties may have patents or obtain patents in the future and claim that the manufacture, use or sale of our product candidates or other

technologies infringes upon these patents. In the event that any third-party claims that we infringe their patents or that we are otherwise employing their
proprietary technology without authorization and initiates litigation against us, even if we believe such claims are without merit, a court of competent
jurisdiction could hold that such patents are valid, enforceable and infringed by our product candidates or other technologies. In this case, the holders of such
patents may be able to block our ability to commercialize the applicable product candidate or technology unless we obtain a license under the applicable
patents, or until such patents expire or are finally determined to be held invalid or unenforceable. Such a license may not be available on commercially
reasonable terms or at all. Even if we are able to obtain a license, the license would likely obligate us to pay license

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fees or royalties or both, and the rights granted to us might be nonexclusive, which could result in our competitors gaining access to the same intellectual
property. If we are unable to obtain a necessary license to a third-party patent on commercially reasonable terms, we may be unable to commercialize our
product candidates or other technologies, or such commercialization efforts may be significantly delayed, which could in turn significantly harm our business.

Defense of infringement claims, regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of

management and other employee resources from our business, and may impact our reputation. In the event of a successful claim of infringement against us,
we may be enjoined from further developing or commercializing our infringing product candidates or other technologies. In addition, we may have to pay
substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay royalties,
and/or redesign our infringing product candidates or technologies, which may be impossible or require substantial time and monetary expenditure. In that
event, we would be unable to further develop and commercialize our product candidates or other technologies, which could harm our business significantly.

Engaging in litigation to defend against third parties alleging that we have infringed, misappropriated, or otherwise violated their patents or other

intellectual property rights is very expensive, particularly for a company of our size, and time-consuming. Some of our competitors may be able to sustain the
costs of litigation or administrative proceedings more effectively than we can because of greater financial resources. Patent litigation and other proceedings
may also absorb significant management time. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings against us
could impair our ability to compete in the marketplace. The occurrence of any of the foregoing could have a material adverse effect on our business, financial
condition, results of operations, and growth prospects.

We may become involved in lawsuits to protect or enforce our patents and other intellectual property rights, which could be expensive, time consuming,
and unsuccessful.

Competitors may infringe our patents or the patents of our licensing partners, or we may be required to defend against claims of infringement. In
addition, our patents or the patents of our licensing partners also may become involved in inventorship, priority, or validity disputes. To counter or defend
against such claims can be expensive and time consuming. In an infringement proceeding, a court may decide that a patent in which we have an interest is
invalid or unenforceable, the other party’s use of our patented technology falls under the safe harbor to patent infringement under 35 U.S.C. §271(e)(1), or
may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. An adverse
result in any litigation proceeding could put one or more of our patents at risk of being invalidated or interpreted narrowly. Furthermore, because of the
substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be
compromised by disclosure during this type of litigation.

Even if resolved in our favor, litigation or other legal proceedings relating to intellectual property claims may cause us to incur significant expenses
and could distract our personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions, or
other interim proceedings or developments, and if securities analysts or investors perceive these results to be negative, it could have a substantial adverse
effect on the price of our common stock. Such litigation or proceedings could substantially increase our operating losses and reduce the resources available
for development activities or any future sales, marketing, or distribution activities. We may not have sufficient financial or other resources to conduct such
litigation or proceedings adequately. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can
because of their greater financial resources and more mature and developed intellectual property portfolios. Uncertainties resulting from the initiation and
continuation of patent litigation or other proceedings could have a material adverse effect on our ability to compete in the marketplace.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our
business may be adversely affected.

Our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented, or declared generic or determined to be

infringing on other marks. We may not be able to protect our rights to these

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trademarks and trade names, which we need to build name recognition among potential partners or customers in our markets of interest. At times, competitors
or other third parties may adopt trade names or trademarks similar to ours, thereby impeding our ability to build brand identity and possibly leading to market
confusion. In addition, there could be potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks
that incorporate variations of our registered or unregistered trademarks or trade names. Over the long term, if we are unable to establish name recognition
based on our trademarks and trade names, then we may not be able to compete effectively and our business may be adversely affected. Our efforts to enforce
or protect our proprietary rights related to trademarks, trade secrets, domain names, copyrights or other intellectual property may be ineffective and could
result in substantial costs and diversion of resources and could adversely affect our business, financial condition, results of operations, and growth prospects.

Intellectual property rights do not necessarily address all potential threats.

The degree of future protection afforded by our intellectual property rights is uncertain because intellectual property rights have limitations and may

not adequately protect our business or permit us to maintain our competitive advantage. For example:

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others may be able to make products that are similar to our product candidates or utilize similar technology but that are not covered by the
claims of the patents that we license or may own;

we, or our current or future licensors or collaborators, might not have been the first to make the inventions covered by the issued patent or
pending patent application that we license or own now or in the future;

we, or our current or future licensors or collaborators, might not have been the first to file patent applications covering certain of our or their
inventions;

others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our owned or
licensed intellectual property rights;

it is possible that our current or future pending owned or licensed patent applications will not lead to issued patents;

issued patents that we hold rights to may be held invalid or unenforceable, including as a result of legal challenges by our competitors or
other third parties;

our competitors or other third parties might conduct research and development activities in countries where we do not have patent rights and
then use the information learned from such activities to develop competitive products for sale in our major commercial markets;

we may not develop additional proprietary technologies that are patentable;

the patents of others may harm our business; and

we may choose not to file a patent in order to maintain certain trade secrets or know-how, and a third party may subsequently file a patent
covering such intellectual property.

Should any of these events occur, they could have a material adverse effect on our business, financial condition, results of operations, and growth

prospects.

Risks Related to Our Operations

We are highly dependent on our key personnel, and if we are not successful in attracting, motivating, and retaining highly qualified personnel, we may
not be able to successfully implement our business strategy.

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract, motivate, and retain

highly qualified managerial, scientific, and medical personnel. We are highly dependent on our management, particularly our Chief Executive Officer,
Dr. Arnon Rosenthal, and our scientific and medical personnel. The loss of the services provided by any of our executive officers, other key employees, and
other scientific and medical advisors, and our inability to find suitable replacements, could result in delays in the development of our product candidates and
harm our business.

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We conduct our operations at our facility in South San Francisco, California, in a region that is headquarters to many other biopharmaceutical
companies and many academic and research institutions. Competition for skilled personnel is intense and the turnover rate can be high, which may limit our
ability to hire and retain highly qualified personnel on acceptable terms or at all. We expect that we may need to recruit talent from outside of our region, and
doing so may be costly and difficult.

To induce valuable employees to remain at our company, in addition to salary and cash incentives, we have provided restricted stock and stock option

grants that vest over time. The value to employees of these equity grants that vest over time may be significantly affected by movements in our stock price
that are beyond our control, and may at any time be insufficient to counteract more lucrative offers from other companies. Although we have employment
agreements with our key employees, these employment agreements provide for at-will employment, which means that any of our employees could leave our
employment at any time, with or without notice. If we are unable to attract and incentivize quality personnel on acceptable terms, or at all, it may cause our
business and operating results to suffer.

We will need to grow the size and capabilities of our organization, and we may experience difficulties in managing this growth.

As of December 31, 2018, we had 78 full-time employees. As our development plans and strategies develop, and as we transition into operating as a

public company, we must add a significant number of additional managerial, operational, financial, and other personnel. Future growth will impose significant
added responsibilities on members of management, including:

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identifying, recruiting, integrating, retaining, and motivating additional employees;

managing our internal development efforts effectively, including the clinical and FDA review process for our current and future product
candidates, while complying with our contractual obligations to contractors and other third parties;

expanding our operational, financial and management controls, reporting systems, and procedures; and

managing increasing operational and managerial complexity.

Our future financial performance and our ability to continue to develop and, if approved, commercialize our product candidates will depend, in part,

on our ability to effectively manage any future growth. Our management may also have to divert a disproportionate amount of its attention away from day-to-
day activities in order to manage these growth activities.

We currently rely, and for the foreseeable future will continue to rely, in substantial part on certain independent organizations, advisors, and
consultants to provide certain services. There can be no assurance that the services of these independent organizations, advisors, and consultants will continue
to be available to us on a timely basis when needed, or that we can find qualified replacements. In addition, if we are unable to effectively manage our
outsourced activities or if the quality or accuracy of the services provided by consultants is compromised for any reason, our clinical trials may be extended,
delayed, or terminated, and we may not be able to obtain regulatory approval of our product candidates or otherwise advance our business. There can be no
assurance that we will be able to manage our existing consultants or find other competent outside contractors and consultants on economically reasonable
terms, if at all.

If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, we may

not be able to successfully implement the tasks necessary to further develop our product candidates and, accordingly, may not achieve our research,
development, and commercialization goals.

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We have engaged in strategic collaborations and may in the future engage in acquisitions, collaborations, or strategic partnerships, which may increase
our capital requirements, dilute our stockholders, cause us to incur debt or assume contingent liabilities, and subject us to other risks.

We have engaged in strategic collaborations in the past, such as our strategic collaboration with AbbVie, and we may engage in various acquisitions,
collaborations, and strategic partnerships in the future, including licensing or acquiring complementary products, intellectual property rights, technologies, or
businesses. Any acquisition, collaboration, or strategic partnership may entail numerous risks, including:

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increased operating expenses and cash requirements;

volatility with respect to the financial reporting related to such arrangements, such as our expected variability in the recognition of revenue
each quarter from the AbbVie Agreement based on the percentage-of-completion basis under the applicable accounting rules;

assumption of indebtedness or contingent liabilities;

issuance of our equity securities which would result in dilution to our stockholders;

assimilation of operations, intellectual property, products, and product candidates of an acquired company, including difficulties associated
with integrating new personnel;

diversion of our management’s attention from our existing product programs and initiatives in pursuing such an acquisition or strategic
partnership;

retention of key employees, the loss of key personnel, and uncertainties in our ability to maintain key business relationships;

risks and uncertainties associated with the other party to such a transaction, including the prospects of that party and their existing products or
product candidates and regulatory approvals; and

our inability to generate revenue from acquired intellectual property, technology, and/or products sufficient to meet our objectives or even to
offset the associated transaction and maintenance costs.

In addition, if we undertake such a transaction, we may issue dilutive securities, assume or incur debt obligations, incur large one-time expenses, and

acquire intangible assets that could result in significant future amortization expense.

Our internal computer systems, or those used by our third-party research institution collaborators, CROs or other contractors or consultants, may fail or
suffer other breakdowns, cyberattacks, or information security breaches that could compromise the confidentiality, integrity, and availability of such
systems and data, result in material disruptions of our development programs and business operations, risk disclosure of confidential, financial, or
proprietary information, and affect our reputation.

Despite the implementation of security measures, our internal computer systems and those of our future CROs and other contractors and consultants
may be vulnerable to damage from computer viruses and unauthorized access. As the cyber-threat landscape evolves, these attacks are growing in frequency,
sophistication, and intensity, and are becoming increasingly difficult to detect. Such attacks could include the use of key loggers or other harmful and virulent
malware, including ransomware or other denials of service, and can be deployed through malicious websites, the use of social engineering, and/or other
means. If a breakdown, cyberattack, or other information security breach were to occur and cause interruptions in our operations, it could result in a
misappropriation of confidential information, including our intellectual property or financial information, and a material disruption of our development
programs and our business operations. For example, the loss of clinical trial data from completed, ongoing, or future clinical trials could result in delays in our
regulatory approval efforts and significantly increase our costs to recover or reproduce the data. Likewise, we rely on our third-party research institution
collaborators for research and development of our product candidates and other third parties for the manufacture of our product candidates and to conduct
clinical trials, and similar events relating to their computer systems could also have a material adverse effect on our business. To the extent that any disruption
or security breach were to result in a loss of, or damage to, our data or systems, or inappropriate disclosure of confidential, financial, or proprietary
information, including data related to our personnel, we could incur liability or risk disclosure of confidential, financial, or proprietary information, and the
further development and commercialization of our product candidates

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could be delayed. There can be no assurance that we and our business counterparties will be successful in efforts to detect, prevent, or fully recover systems
or data from all breakdowns, service interruptions, attacks, or breaches of systems that could adversely affect our business and operations and/or result in the
loss of critical or sensitive data, which could result in financial, legal, business, or reputational harm to us.

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations, and those of our third-party research institution collaborators, CROs, CDMOs, suppliers, and other contractors and consultants, could

be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, typhoons, fires, extreme weather conditions,
medical epidemics, and other natural or man-made disasters or business interruptions, for which we are partly uninsured. In addition, we rely on our third-
party research institution collaborators for conducting research and development of our product candidates, and they may be affected by government
shutdowns or withdrawn funding. The occurrence of any of these business disruptions could seriously harm our operations and financial condition and
increase our costs and expenses. We rely on third-party manufacturers to produce and process our product candidates. Our ability to obtain clinical supplies of
our product candidates could be disrupted if the operations of these suppliers are affected by a man-made or natural disaster or other business interruption.

The majority of our operations including our corporate headquarters are located in a facility in South San Francisco, California. Damage or extended

periods of interruption to our corporate, development, or research facilities due to fire, natural disaster, power loss, communications failure, unauthorized
entry, or other events could cause us to cease or delay development of some or all of our product candidates. Although we maintain property damage and
business interruption insurance coverage on these facilities, our insurance might not cover all losses under such circumstances and our business may be
seriously harmed by such delays and interruption.

Our business is subject to economic, political, regulatory, and other risks associated with international operations.

Our business is subject to risks associated with conducting business internationally. Some of our CDMOs are located outside the United States.

Accordingly, our future results could be harmed by a variety of factors, including:

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economic weakness, including inflation, or political instability in particular non-U.S. economies and markets;

differing and changing regulatory requirements in non-U.S. countries;

challenges enforcing our contractual and intellectual property rights, especially in those foreign countries that do not respect and protect
intellectual property rights to the same extent as the United States;

difficulties in compliance with non-U.S. laws and regulations;

changes in non-U.S. regulations and customs, tariffs, and trade barriers;

changes in non-U.S. currency exchange rates and currency controls;

changes in a specific country’s or region’s political or economic environment;

shipping of biologics/drugs;

trade protection measures, import or export licensing requirements, or other restrictive actions by U.S. or non-U.S. governments;

negative consequences from changes in tax laws;

compliance with tax, employment, immigration, and labor laws for employees living or traveling abroad;

workforce uncertainty in countries where labor unrest is more common than in the United States;

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difficulties associated with staffing and managing international operations, including differing labor relations;

potential liability under the FCPA, UK Bribery Act, or comparable foreign laws; and

business interruptions resulting from geo-political actions, including war and terrorism, or natural disasters including earthquakes, typhoons,
floods, and fires.

These and other risks associated with our planned international operations may materially adversely affect our ability to attain profitable operations.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

As of December 31, 2018, we had federal and state net operating loss carryforwards of approximately $17.5 million and $17.1 million, respectively,

which will begin to expire in 2037, if not utilized. Due to tax reform, the Company also has federal NOL carryforwards of $42.9 million generated after
December 31, 2017, which do not expire. Under Sections 382 and 383 of the United States Internal Revenue Code of 1986, as amended, or the Code, if a
corporation undergoes an “ownership change” (generally defined as a greater than 50-percentage-point cumulative change (by value) in the equity ownership
of certain stockholders over a rolling three-year period), the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change
tax attributes to offset its post-change taxable income or taxes may be limited. As a result of our initial public offering in February 2019, and recent private
placements and other transactions that have occurred since our incorporation, we may have experienced such an ownership change. We may also experience
ownership changes in the future as a result of subsequent shifts in our stock ownership, some of which are outside our control. As a result, our ability to use
our pre-change net operating loss carryforwards and other pre-change tax attributes to offset post-change taxable income or taxes may be subject to limitation.

Risks Related to Ownership of Our Common Stock

We do not know whether a market will develop for our common stock or what the market price of our common stock will be, and, as a result, it may be
difficult for you to sell your shares of our common stock.

Prior to our initial public offering in February 2019, there was no public trading market for our common stock. If a market for our common stock

does not develop or is not sustained, it may be difficult for you to sell your shares of common stock at an attractive price or at all. We cannot predict the prices
at which our common stock will trade. It is possible that in one or more future periods our results of operations and progression of our product pipeline may
not meet the expectations of public market analysts and investors, and, as a result of these and other factors, the price of our common stock may fall.

The market price of our common stock may be volatile, which could result in substantial losses for investors.

The trading price of our common stock may be highly volatile and could be subject to wide fluctuations in response to various factors, some of which

are beyond our control. Some of the factors that may cause the market price of our common stock to fluctuate include:

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the success of existing or new competitive products or technologies;

the timing and results of clinical trials for our current product candidates and any future product candidates that we may develop;

commencement or termination of collaborations for our product development and research programs;

failure to achieve development, regulatory, or commercialization milestones under our collaborations;

failure or discontinuation of any of our product development and research programs;

results of preclinical studies, clinical trials, or regulatory approvals of product candidates of our competitors, or announcements about new
research programs or product candidates of our competitors;

regulatory or legal developments in the United States and other countries;

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developments or disputes concerning patent applications, issued patents, or other proprietary rights;

the recruitment or departure of key personnel;

the level of expenses related to any of our research programs, clinical development programs, or product candidates that we may develop;

the results of our efforts to develop additional product candidates or products;

actual or anticipated changes in estimates as to financial results, development timelines, or recommendations by securities analysts;

announcement or expectation of additional financing efforts;

sales of our common stock by us, our insiders, or other stockholders;

expiration of market standoff or lock-up agreements;

variations in our financial results or those of companies that are perceived to be similar to us;

changes in estimates or recommendations by securities analysts, if any, that cover our stock;

changes in the structure of healthcare payment systems;

market conditions in the pharmaceutical and biotechnology sectors;

general economic, industry, and market conditions; and

the other factors described in this “Risk Factors” section.

In recent years, the stock market in general, and the market for pharmaceutical and biotechnology companies in particular, has experienced significant

price and volume fluctuations that have often been unrelated or disproportionate to changes in the operating performance of the companies whose stock is
experiencing those price and volume fluctuations. Broad market and industry factors may seriously affect the market price of our common stock, regardless of
our actual operating performance. Following periods of such volatility in the market price of a company’s securities, securities class action litigation has often
been brought against that company. Because of the potential volatility of our stock price, we may become the target of securities litigation in the future.
Securities litigation could result in substantial costs and divert management’s attention and resources from our business.

If securities analysts do not publish research or reports about our business or if they publish negative evaluations of our stock, the price of our stock
could decline.

The trading market for our common stock will rely in part on the research and reports that industry or financial analysts publish about us or our

business. If few analysts commence coverage of us, the trading price of our stock could decrease. If one or more of the analysts covering our business
downgrade their evaluations of our stock or if we fail to meet their operating results estimates for us, the price of our stock could decline. If one or more of
these analysts cease to cover our stock, we could lose visibility in the market for our stock, which in turn could cause our stock price to decline.

A significant portion of our total outstanding shares is restricted from immediate resale but may be sold into the market in the near future, which could
cause the market price of our common stock to decline significantly, even if our business is doing well.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, upon the expiration of

existing market standoff and lock-up agreements, the early release of these agreements, or the perception in the market that the holders of a large number of
shares of common stock intend to sell shares, could reduce the market price of our common stock. Approximately 59,131,626 shares, or 85.9% of our
outstanding shares as of March 1, 2019, are currently prohibited or otherwise restricted under securities laws, market standoff agreements entered into by our
stockholders with us, or lock-up agreements entered into by our stockholders with the underwriters of our initial public offering; however, subject to
applicable securities law restrictions and excluding shares of restricted stock that will remain unvested, these shares will be able to be sold in the public
market beginning as early as August 6, 2019. The underwriters in our initial public offering may, in their

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sole discretion, release all or some portion of the shares subject to lock-up agreements at any time and for any reason. Approximately 1,718,000 shares of
unvested restricted stock were issued and outstanding as of March 1, 2019, will become available for sale immediately upon the vesting of such shares, as
applicable, and the expiration of any applicable market standoff or lock-up agreements.

On February 7, 2019 we filed a registration statement on Form S-8 registering shares of common stock issued or issuable under our equity
compensation plans. As a result, shares registered under this registration statement on Form S-8 can be freely sold in the public market upon issuance and
once vested, subject to volume limitations applicable to affiliates and the lock-up agreements described above. If any of these additional shares are sold, or if
it is perceived that they will be sold, in the public market, the market price of our common stock could decline.

In addition, holders of an aggregate of 59,809,220 shares of our common stock will have rights, subject to conditions, to require us to file registration
statements covering their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. Registration of these
shares under the Securities Act would result in the shares becoming freely tradeable in the public market, subject to the restrictions of Rule 144 in the case of
our affiliates.

Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our technologies or
product candidates.

We may seek additional capital through a combination of public and private equity offerings, debt financings, strategic partnerships and alliances, and

licensing arrangements. We, and indirectly, our stockholders, will bear the cost of issuing and servicing such securities. Because our decision to issue debt or
equity securities in any future offering will depend on market conditions and other factors beyond our control, we cannot predict or estimate the amount,
timing, or nature of any future offerings. To the extent that we raise additional capital through the sale of equity or debt securities, your ownership interest
will be diluted, and the terms may include liquidation or other preferences that adversely affect your rights as a stockholder. The incurrence of indebtedness
would result in increased fixed payment obligations and could involve restrictive covenants, such as limitations on our ability to incur additional debt,
limitations on our ability to acquire, sell, or license intellectual property rights and other operating restrictions that could adversely impact our ability to
conduct our business. Additionally, any future collaborations we enter into with third parties may provide capital in the near term but limit our potential cash
flow and revenue in the future. If we raise additional funds through strategic partnerships and alliances and licensing arrangements with third parties, we may
have to relinquish valuable rights to our technologies or product candidates, or grant licenses on terms unfavorable to us.

Our principal stockholders and management own a significant percentage of our stock and will be able to exercise significant influence over matters
subject to stockholder approval

As of March 1, 2019, our directors, executive offers, holders of more than 5% of our outstanding stock and their respective affiliates beneficially
owned shares representing approximately 34.4% of our outstanding common stock. As a result, these stockholders, if they act together, may significantly
influence all matters requiring stockholder approval, including the election of directors and approval of significant corporate transactions. This concentration
of ownership may have the effect of delaying or preventing a change in control of our company that our other stockholders may believe is in their best
interests. This in turn could have a material adverse effect on our stock price and may prevent attempts by our stockholders to replace or remove the board of
directors or management.

We are an “emerging growth company,” and the reduced disclosure requirements applicable to emerging growth companies may make our common stock
less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act. For so long as we remain an emerging growth company, we are permitted and

plan to rely on exemptions from certain disclosure requirements that are applicable to other public companies that are not emerging growth companies. These
exemptions include not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002 (SOX), not
being required to comply with any requirement that may be adopted by the Public Company Accounting

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Oversight Board regarding mandatory audit firm rotation or a supplement to the auditor’s report providing additional information about the audit and the
financial statements, reduced disclosure obligations regarding executive compensation, and exemptions from the requirements of holding a nonbinding
advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. As a result, the information
we provide stockholders will be different than the information that is available with respect to other public companies. We cannot predict whether investors
will find our common stock less attractive if we rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a
less active trading market for our common stock, and our stock price may be more volatile.

In addition, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or

revised accounting standards. This allows an emerging growth company to delay the adoption of certain accounting standards until those standards would
otherwise apply to private companies. We have irrevocably elected not to avail ourselves of this exemption from new or revised accounting standards, and,
therefore, we will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.

We will incur increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new
compliance initiatives and corporate governance practices.

As a public company, and particularly after we are no longer an emerging growth company, we will incur significant legal, accounting, and other

expenses that we did not incur as a private company. The SOX, the Dodd-Frank Wall Street Reform, and Consumer Protection Act, the listing requirements of
NASDAQ, and other applicable securities rules and regulations impose various requirements on public companies, including establishment and maintenance
of effective disclosure and financial controls and corporate governance practices. We expect that we will need to hire additional accounting, finance, and other
personnel in connection with our becoming, and our efforts to comply with the requirements of being, a public company, and our management and other
personnel will need to devote a substantial amount of time towards maintaining compliance with these requirements. These requirements will increase our
legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect that the rules and regulations
applicable to us as a public company may make it more difficult and more expensive for us to obtain director and officer liability insurance, which could
make it more difficult for us to attract and retain qualified members of our board of directors. We are currently evaluating these rules and regulations and
cannot predict or estimate the amount of additional costs we may incur or the timing of such costs. These rules and regulations are often subject to varying
interpretations, in many cases due to their lack of specificity, and, as a result, their application in practice may evolve over time as new guidance is provided
by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing
revisions to disclosure and governance practices.

Pursuant to SOX Section 404, we will be required to furnish a report by our management on our internal control over financial reporting beginning
with our second filing of an Annual Report on Form 10-K with the SEC after we become a public company. However, while we remain an emerging growth
company, we will not be required to include an attestation report on internal control over financial reporting issued by our independent registered public
accounting firm. To achieve compliance with SOX Section 404 within the prescribed period, we will be engaged in a process to document and evaluate our
internal control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal resources,
potentially engage outside consultants, adopt a detailed work plan to assess and document the adequacy of internal control over financial reporting, continue
steps to improve control processes as appropriate, validate through testing that controls are functioning as documented, and implement a continuous reporting
and improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to conclude, within the
prescribed timeframe or at all, that our internal control over financial reporting is effective as required by SOX Section 404. If we identify one or more
material weaknesses, it could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our financial statements.

87

 
If we are unable to maintain effective internal controls, our business, financial position, and results of operations could be adversely affected.

As a public company, we will be subject to reporting and other obligations under the Exchange Act, including the requirements of SOX Section 404,
which require annual management assessments of the effectiveness of our internal control over financial reporting. However, our auditors will not be required
to formally attest to the effectiveness of our internal control over financial reporting pursuant to SOX Section 404 until we are no longer an emerging growth
company if we continue to take advantage of the exemptions available to us through the JOBS Act.

The rules governing the standards that must be met for management to assess our internal control over financial reporting are complex and require
significant documentation, testing and possible remediation to meet the detailed standards under the rules. During the course of its testing, our management
may identify material weaknesses or deficiencies which may not be remedied in time to meet the deadline imposed by the Sarbanes-Oxley Act of 2002. These
reporting and other obligations place significant demands on our management and administrative and operational resources, including accounting resources.

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control over financial

reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with accounting principles generally accepted in the United States. Any failure to maintain effective internal controls could
have an adverse effect on our business, financial position, and results of operations.

We do not expect to pay any dividends for the foreseeable future. Investors may never obtain a return on their investment.

You should not rely on an investment in our common stock to provide dividend income. We do not anticipate that we will pay any dividends to
holders of our common stock in the foreseeable future. Instead, we plan to retain any earnings to maintain and expand our existing operations. In addition, any
future credit facility may contain terms prohibiting or limiting the amount of dividends that may be declared or paid on our common stock. Accordingly,
investors must rely on sales of their common stock after price appreciation, which may never occur, as the only way to realize any return on their investment.
As a result, investors seeking cash dividends should not purchase our common stock.

Delaware law and provisions in our amended and restated certificate of incorporation and bylaws might discourage, delay, or prevent a change in control
of our company or changes in our management and, therefore, depress the trading price of our common stock.

Provisions in our amended and restated certificate of incorporation and bylaws may discourage, delay, or prevent a merger, acquisition, or other

change in control that stockholders may consider favorable, including transactions in which you might otherwise receive a premium for your shares of our
common stock. These provisions may also prevent or frustrate attempts by our stockholders to replace or remove our management. Therefore, these
provisions could adversely affect the price of our common stock. Among other things, our charter documents:

•

•

•

•

•

establish that our board of directors is divided into three classes, Class I, Class II, and Class III, with each class serving staggered three-year
terms;

provide that vacancies on our board of directors may be filled only by a majority of directors then in office, even though less than a quorum;

provide that our directors may only be removed for cause;

eliminate cumulative voting in the election of directors;

authorize our board of directors to issues shares of preferred stock and determine the price and other terms of those shares, including
preferences and voting rights, without stockholder approval;

88

 
 
 
 
 
 
 
•

•

•

•

•

•

provide our board of directors with the exclusive right to elect a director to fill a vacancy or newly created directorship;

permit stockholders to only take actions at a duly called annual or special meeting and not by written consent;

prohibit stockholders from calling a special meeting of stockholders;

require that stockholders give advance notice to nominate directors or submit proposals for consideration at stockholder meetings;

authorize our board of directors, by a majority vote, to amend the bylaws; and

require the affirmative vote of at least 66 2/3% or more of the outstanding shares of common stock to amend many of the provisions
described above.

In addition, Section 203 of the General Corporation Law of the State of Delaware (DGCL), prohibits a publicly-held Delaware corporation from

engaging in a business combination with an interested stockholder, generally a person which together with its affiliates owns, or within the last three years has
owned, 15% of our voting stock, for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the
business combination is approved in a prescribed manner.

Any provision of our amended and restated certificate of incorporation, amended and restated bylaws, or Delaware law that has the effect of delaying

or preventing a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our capital stock and could also
affect the price that some investors are willing to pay for our common stock.

Our amended and restated bylaws provide that the Court of Chancery of the State of Delaware is the exclusive forum for substantially all disputes
between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors,
officers, or employees.

Our amended and restated bylaws provide that, unless we consent to the selection of an alternative forum, the Court of Chancery of the State of

Delaware is the exclusive forum for (i) any derivative action or proceeding brought on behalf of us, (ii) any action asserting a claim of breach of a fiduciary
duty owed by any of our directors, officers, or other employees to us or our stockholders, (iii) any action arising pursuant to any provision of the DGCL or our
certificate of incorporation or bylaws (as either may be amended from time to time), or (iv) any action asserting a claim governed by the internal affairs
doctrine, except, in each case, (A) any claim as to which such court determines that there is an indispensable party not subject to the jurisdiction of such court
(and the indispensable party does not consent to the personal jurisdiction of such court within 10 days following such determination), (B) which is vested in
the exclusive jurisdiction of a court or forum other than such court, or (C) for which such court does not have subject matter jurisdiction.

These exclusive-forum provisions may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or
our directors, employees, control persons, underwriters, or agents, which may discourage lawsuits against us and our directors, employees, control persons,
underwriters, or agents. Additionally, a court could determine that the exclusive forum provision is unenforceable, and our stockholders will not be deemed to
have waived our compliance with the federal securities laws and the rules and regulations thereunder. If a court were to find these provisions of our amended
and restated bylaws inapplicable to, or unenforceable in respect of, one or more of the specified types of actions or proceedings, we may incur additional costs
associated with resolving such matters in other jurisdictions, which could adversely affect our business, financial condition, or results of operations.

Item 1B. Unresolved Staff Comments.

None.

89

 
 
 
 
 
 
 
 
Item 2. Properties.

Our corporate headquarters are currently located in South San Francisco, California, where we lease 15,748 square feet of office, research and
development, engineering, and laboratory space pursuant to a lease agreement that expires in April 2019. We lease 8,763 square feet of additional office and
laboratory space in Milpitas, California. In order to accommodate our anticipated growth in connection with our future development and commercialization
efforts, we recently entered into a lease agreement for new corporate headquarters. Our new corporate headquarters will provide for approximately 105,000
square feet of office and laboratory space in South San Francisco, California. The term of the lease agreement expires 10 years from the later date of when the
premises are ready for occupancy and May 1, 2019, with an option to extend the term of the lease for an additional 10 years. The new lease agreement also
provides us a right of first offer to expand into available office space in the building. We currently anticipate that we will begin occupying this new space
beginning in May 2019. We believe that these facilities will be adequate for our near-term needs. If required, we believe that suitable additional or alternative
space would be available in the future on commercially reasonable terms.

Item 3. Legal Proceedings.

From time to time, we may become involved in litigation or other legal proceedings. We are not currently a party to any litigation or legal

proceedings that, in the opinion of our management, are likely to have a material adverse effect on our business. Regardless of outcome, litigation can have an
adverse impact on us because of defense and settlement costs, diversion of management resources, and other factors.

Item 4. Mine Safety Disclosures.

Not applicable.

90

 
 
PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market Information for Common Stock

Our common stock has been publicly traded on the NASDAQ Global Select Market under the symbol "ALEC" since February 7, 2019. Prior to that

time, there was no public market for our common stock. As a result, we have not set forth quarterly information with respect to the high and low prices for
our common stock for the two most recent fiscal years.

On March 15, 2019, the closing price for our common stock as reported on the NASDAQ Global Select Market was $18.05 per share.

Holders of Record

As of March 15, 2019, there were approximately 104 stockholders of record. The actual number of stockholders is greater than this number of record

holders and includes stockholders who are beneficial owners but whose shares are held in street name by brokers and other nominees.

Dividend Policy

We have not declared or paid any cash dividends on our capital stock since our inception. We intend to retain future earnings, if any, to finance the
operation and expansion of our business and do not anticipate paying any cash dividends in the foreseeable future. Payment of future cash dividends, if any,
will be at the discretion of our board of directors after taking into account various factors, including our financial condition, operating results, current and
anticipated cash needs, the requirements and contractual restrictions of then-existing debt instruments, and other factors that our board of directors deems
relevant.

Stock Performance Graph

The stock performance graph required by Section 201(e) of Regulation S-K has been omitted as our common stock was not publicly traded during

any portion of the period described in Section 201(e).

Use of Proceeds

The Registration Statement on Form S-1 (File No. 333-229152) was declared effective by the SEC for our initial public offering of common stock on

February 6, 2019. We started trading on the NASDAQ Global Select Market on February 7, 2019. In connection with our initial public offering, we sold an
aggregate of 9,739,541 shares of common stock at a public offering price of $19.00 per share, including 489,541 shares sold pursuant to the underwriters’
partial exercise of their option to purchase additional shares. The aggregate offering price for shares sold in the offering was $185.1 million. The underwriters
for our initial public offering were Morgan Stanley & Co. LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, and Cowen and Company, LLC. The
aggregate net proceeds received by the Company from the offering, net of underwriting discounts and commissions and estimated offering expenses, were
$168.2 million. No offering expenses were paid or are payable, directly or indirectly, to our directors or officers, to persons owning 10% or more of any class
of our equity securities or to any of our affiliates.

There has been no material change in the planned use of proceeds from our initial public offering as described in our final prospectus filed with the

SEC on February 7, 2019, pursuant to Rule 424(b)(4). We invested the funds received in short-term, interest-bearing, investment-grade securities and
government securities.

91

 
Recent Sales of Unregistered Securities

The following list sets forth information regarding all unregistered securities sold by us since October 13, 2017. No underwriters were involved in the

sales and the certificates representing the securities sold and issued contain legends restricting transfer of the securities without registration under the
Securities Act or an applicable exemption from registration.

(1) In April 2018, July 2018, and October 2018, we issued 9,373,633 shares of our Series E preferred stock at $14.2154 per share, for aggregate

proceeds of $133.2 million to a total of 32 accredited investors. All Series E convertible preferred stock automatically converted into shares of common stock
immediately prior our IPO in February 2019.

(2) From October 13, 2017 to March 15, 2019, we granted stock options to purchase an aggregate of 5,508,084 shares of common stock upon the

exercise of options under our 2017 Plan and 2019 Plan at exercise prices per share ranging from $6.95 to $21.00, for an aggregate exercise price of
approximately $53.7 million.

(3) On October 13, 2017, we completed a reorganization whereby we converted from a Delaware limited liability company, under the name Alector

LLC, to a Delaware corporation under the name Alector, Inc. (the “Conversion”). In conjunction with the Conversion, (i) all of our outstanding common units
converted on a 1-for-1 basis into 9,421,460 shares of common stock; (ii) all of our outstanding preferred units converted on a 1-for-1 basis into 36,001,203
shares of convertible preferred stock; and (iii) our unvested restricted units converted on a 1-for-1 basis into 202,924 shares of unvested restricted common
stock. Prior to the Conversion, we had issued profit interest units to employees. Our vested profit interest units converted on a net issuance basis into
1,035,653 shares of common stock and our unvested profit interest units converted on a net issuance basis into 3,165,350 shares of restricted common stock.

The offers, sales, and issuances of the securities described in Items 15(1) were exempt from registration under the Securities Act under Section 4(a)
(2) of the Securities Act or Regulation D promulgated thereunder as transactions by an issuer not involving a public offering. The recipients of securities in
each of these transactions acquired the securities for investment only and not with a view to or for sale in connection with any distribution thereof and
appropriate legends were affixed to the securities issued in these transactions. Each of the recipients of securities in these transactions was an accredited
person and had adequate access, through employment, business, or other relationships, to information about the registrant.

The offers, sales, and issuances of the securities described in Items 15(2) and 15(3) were exempt from registration under the Securities Act under
either (1) Rule 701 in that the transactions were under compensatory benefit plans and contracts relating to compensation as provided under Rule 701 or
(2) Section 4(a)(2) of the Securities Act as transactions by an issuer not involving any public offering. The recipients of such securities were the registrant’s
employees, consultants, or directors and received the securities under the registrant’s 2017 Plan. The recipients of securities in each of these transactions
represented their intention to acquire the securities for investment only and not with view to or for sale in connection with any distribution thereof and
appropriate legends were affixed to the securities issued in these transactions.

92

 
 
Item 6. Selected Financial Data.

The following tables summarize our selected consolidated financial data for the periods and as of the dates indicated. We derived our consolidated

statement of operations data for the years ended December 31, 2018, 2017, and 2016, and the consolidated balance sheet data as of December 31, 2018, 2017,
and 2016, from our audited consolidated financial statements and related notes included elsewhere in this report. Our historical results are not necessarily
indicative of the results that may be expected in the future. You should read the following selected consolidated financial data in conjunction with our
consolidated financial statements and the related notes appearing elsewhere in this report and the information in the section titled and “Management’s
Discussion and Analysis of Financial Condition and Results of Operations.”

Consolidated Statement of Operations Data:
Revenue:

Collaboration revenue
Grant revenue

Total revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income, net
Net loss

Net loss per share, basic and diluted

Shares used in computing net loss per common
   share, basic and diluted

Consolidated Balance Sheet Data:
Cash, cash equivalents, and marketable securities
Working capital
Total assets
Deferred revenue
Total liabilities
Convertible preferred stock(1)
Accumulated deficit
Total stockholders’ deficit

  $

  $

  $

  $

2018

Years Ended December 31,
2017
(In thousands, except share
and per share data)

2016

27,508    $
169   
27,677   

73,031   
11,934   
84,965   
(57,288)  
5,040   
(52,248)   $

2,872    $
863   
3,735   

29,911   
6,503   
36,414   
(32,679)  
199   
(32,480)   $

(4.62)   $

(3.55)   $

— 
416 
416 

13,674 
1,874 
15,548 
(15,132)
22 
(15,110)

(2.11)

11,302,788   

9,142,688   

7,173,411

2018

As of December 31,
2017
(in thousands)

2016

290,408    $
245,228   
308,359   
174,620   
195,237   
210,520   
(114,435)  
(97,398)  

32,451    $

205,571   
236,060   
202,128   
210,608   
77,485   
(62,187)  
(52,033)  

50,838 
49,681 
54,111 
— 
1,533 
77,485 
(29,707)
(24,907)

(1) Upon the closing of our IPO in February 2019, all of the outstanding shares of our convertible preferred stock converted into 45,374,836 shares of common
stock.

93

 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with the section entitled “Selected

Consolidated Financial Data” and our consolidated financial statements and related notes included elsewhere in this Annual Report on Form 10-K. This
discussion contains forward-looking statements that involve risks and uncertainties, including those described in the section titled “Special Note Regarding
Forward Looking Statements.” Our actual results and the timing of selected events could differ materially from those discussed below. Factors that could
cause or contribute to such differences include, but are not limited to, those identified below and those set forth under the section titled “Risk Factors”
included elsewhere in this report.

Overview

We are a clinical stage biopharmaceutical company pioneering immuno-neurology, a novel therapeutic approach for the treatment of

neurodegeneration. Immuno-neurology targets immune dysfunction as a root cause of multiple pathologies that are drivers of degenerative brain disorders.
We are developing therapies designed to simultaneously counteract these pathologies by restoring healthy immune function to the brain. Supporting our
scientific approach, our Discovery Platform enables us to advance a broad portfolio of product candidates, validated by human genetics, which we believe
will improve the probability of technical success over shorter development timelines. As a result, in the last five years, we have identified over forty immune
system targets, progressed over ten programs into preclinical research, and advanced three product candidates, AL001 and AL002, into clinical development.
In the first quarter of 2019, the dosing of the single ascending dose Phase 1a in healthy subjects was completed for AL001, initially aimed at treating FTD-
GRN patients. There were no drug-related serious adverse events or dose limiting adverse events reported in the study, achieving the primary endpoint.
Moreover, statistically significant increases in plasma and CSF PGRN levels relative to baseline were also observed, successfully demonstrating proof-of-
mechanism for AL001 in the central nervous systems of healthy subjects. We plan to advance AL001 into a Phase 1b study with proof-of-mechanism data in
FTD-GRN patients expected in the first half of 2019 and into a Phase 2 study with proof-of-concept data in FTD-GRN patients expected in the first half of
2020. In the second half of 2018, we initiated dosing of healthy subjects in the ascending dose Phase 1a study for AL002, a product candidate for Alzheimer’s
disease. In addition, in the first half of 2019, we plan to initiate clinical trials with AL003, a product candidate for Alzheimer’s disease, in an ascending dose
Phase 1a study in healthy subjects. In the second half of 2019, we expect to initiate a Phase 1 study with AL101, a product candidate for multiple
neurodegenerative disorders.

We were originally formed in May 2013 as a Delaware limited liability company under the name Alector LLC. In October 2017, we completed a

reorganization whereby we converted from a Delaware limited liability company to a Delaware corporation under the name Alector, Inc. (the Conversion). In
conjunction with the Conversion, (i) all of our outstanding common units converted on a 1-for-1 basis into shares of common stock, par value $0.0001 per
share; (ii) all of our outstanding preferred units converted on a 1-for-1 basis into shares of convertible preferred stock, par value $0.0001 per share; and
(iii) our 202,924 unvested restricted units converted on a 1-for-1 basis into shares of unvested restricted common stock. Prior to the Conversion, we had
issued profit interest units to employees. Our vested profit interest units converted on a net issuance basis into shares of common stock and our unvested
profit interest units converted on a net issuance basis into restricted common stock. Fractional shares related to the conversion of profit interest grants were
settled in cash. All vesting provisions remained the same following the Conversion.

To date, we have not had any products approved for sale and have not generated any revenue from product sales nor been profitable. Further, we do

not expect to generate revenue from product sales until such time, if ever, that we are able to successfully complete the development and obtain marketing
approval for one of our product candidates. We will continue to require additional capital to develop our product candidates and fund operations for the
foreseeable future. We have incurred net losses in each year since inception and expect to continue to incur net losses for the foreseeable future. Our ability to
generate product revenue will depend on the successful development and eventual commercialization of one or more of our product candidates. Our net losses
were $52.2 million, $32.5 million, and $15.1 million for the years ended December 31, 2018, 2017, and 2016, respectively. As of December 31, 2018, we had
an accumulated deficit of $114.4 million. Substantially all of our net losses have resulted from costs incurred in connection with our research and
development programs and from general and

94

 
administrative costs associated with our operations. We expect our expenses will increase substantially in connection with our ongoing activities, as we:

•

•

•

•

•

•

•

advance product candidates through preclinical studies and clinical trials;

pursue regulatory approval of product candidates;

hire additional personnel;

operate as a public company;

acquire, discover, validate, and develop additional product candidates;

require the manufacture of supplies for our preclinical studies and clinical trials; and

obtain, maintain, expand, and protect our intellectual property portfolio.

Our operations have been financed primarily through the issuance and sale of our convertible preferred stock and through our collaboration with

AbbVie. The issuance and sale of our convertible preferred stock provided net proceeds of $210.5 million through December 31, 2018. In February 2019, we
received $168.2 million net proceeds from the issuance of common stock upon the completion of our IPO, net of underwriting discounts and commissions
and estimated offering expenses.

Components of Results of Operations

Revenue

We have not generated any revenue from product sales and do not expect to do so in the near future. Our revenue to date has been primarily related

the AbbVie Agreement to co-develop product candidates in two programs in clinical development with AbbVie. We recognize revenue related to our research
and development grant as the related research services are performed. We recognize revenue from the upfront payments under the AbbVie Agreement over
time as the services are provided. Revenues are recognized as the program costs are incurred by measuring actual costs incurred to date compared to the
overall total expected costs to satisfy the performance obligation. In addition to receiving the upfront payments, we may also be entitled to development and
regulatory milestone payments, opt-in payments for continued development after proof-of-concept for AL002 and AL003, and other future payments from
profit sharing or royalties after commercialization of product candidates from such programs. For additional details regarding the AbbVie Agreement, see the
section titled “Business— Strategic Alliance with AbbVie.” We also recognized revenue related to our research and development grant from the U.S.
government which ended in Q1 2018.

We expect that our revenue for the next several years will be derived primarily from the AbbVie Agreement. We recorded deferred revenue of
$174.6 million as of December 31, 2018. The deferred revenue is expected to be recognized over the research and development period of the programs
through the completion of proof-of-concept for AL002 and AL003.

Research and Development Expenses

Research and development expenses account for a significant portion of our operating expenses. We record research and development expenses as

incurred. Research and development expenses consist primarily of costs incurred for the discovery and development of our product candidates, which include:

•

•

•

•

•

expenses incurred under agreements with third-party contract organizations, preclinical testing organizations, and consultants;

costs related to production of clinical materials, including fees paid to contract manufacturers;

laboratory and vendor expenses related to the execution of preclinical studies and clinical trials;

personnel-related expenses, including salaries, benefits, and stock-based compensation for personnel engaged in research and development
functions;

costs related to the preparation of regulatory submissions;

95

 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

third-party license fees; and

facilities and other expenses, which include expenses for rent and maintenance of facilities, depreciation and amortization expense, and other
supplies.

We expense all research and development costs in the periods in which they are incurred. Costs for certain development activities are recognized

based on an evaluation of the progress to completion of specific tasks using information and data provided to us by our vendors, collaborators, and third-party
service providers. Nonrefundable advance payments for goods or services to be received in future periods for use in research and development activities are
deferred and capitalized. The capitalized amounts are then expensed as the related goods are delivered and as services are performed.

Specific program expenses include expenses associated with the development of our most advanced product candidates, AL001 and AL002, which
are in Phase 1 clinical trials. We also have expenses related to the discovery and development of future product candidates and separately tracked expenses
related to programs that we expect to move out of preclinical studies and into Phase 1 clinical trials. We do not track personnel or other operating expenses
incurred for our research and development programs on a program-specific basis. These expenses primarily relate to salaries and benefits, stock-based
compensation, facility expenses, including depreciation, and lab consumables.

At this time, we cannot reasonably estimate or know the nature, timing, and estimated costs of the efforts that will be necessary to complete the

development of, and obtain regulatory approval for, any of our product candidates. We expect our research and development expenses to increase
substantially for the foreseeable future as we continue to invest in research and development activities related to developing our product candidates, as our
product candidates advance into later stages of development, as we begin to conduct larger clinical trials, as we seek regulatory approvals for any product
candidates that successfully complete clinical trials, and incur expenses associated with hiring additional personnel to support our research and development
efforts. The process of conducting the necessary clinical research to obtain regulatory approval is costly and time-consuming, and the successful development
of our product candidates is highly uncertain.

General and Administrative Expenses

General and administrative expenses consist primarily of personnel-related costs, including stock-based compensation, for our personnel in executive,

legal, finance and accounting, human resources, and other administrative functions. General and administrative expenses also include legal fees relating to
intellectual property and corporate matters, professional fees paid for accounting, auditing, consulting, and tax services, insurance costs, and facility costs not
otherwise included in research and development expenses.

We anticipate that our general and administrative expenses will increase in the future as we increase our headcount to support our continued research
activities and development of our programs. We also anticipate that we will incur increased expenses as a result of operating as a public company, including
expenses related to compliance with the rules and regulations of the SEC and those of the NASDAQ Stock Market on which our securities are traded, legal,
auditing, additional insurance expenses, investor relations activities, and other administrative and professional services.

Other Income, Net

Other income, net consists of interest earned on our cash equivalents and marketable securities and foreign currency transaction gains and losses

incurred during the period.

96

 
 
 
Results of Operations

Comparison of the Years Ended December 31, 2018 and 2017

Revenue:

Collaboration revenue
Grant revenue

Total revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income, net
Net loss

Year Ended
December 31,

2018

2017
(In thousands)

Dollar
Change

  $

  $

27,508    $
169   
27,677   

73,031   
11,934   
84,965   
(57,288)  
5,040   
(52,248)   $

2,872    $
863   
3,735   

29,911   
6,503   
36,414   
(32,679)  
199   
(32,480)   $

24,636 
(694)
23,942 

43,120 
5,431 
48,551 
(24,609)
4,841 
(19,768)

Revenue

Total revenue was $27.7 million for the year ended December 31, 2018, compared to $3.7 million for the year ended December 31, 2017. The
increase of $23.9 million was primarily due to collaboration revenue recognized from the upfront payments under the AbbVie Agreement, which was entered
into in the fourth quarter of 2017, offset by a $0.7 million reduction related to grant revenue from the U.S. government.

Research and Development Expenses

Research and development expenses were $73.0 million for the year ended December 31, 2018, compared to $29.9 million for the year ended
December 31, 2017. The increase of $43.1 million was driven by an increase in expenses for four product candidates that we are preparing for or have entered
into Phase 1 clinical trials and related increase in activities for the manufacturing of clinical materials, including $10.6 million for AL001, $3.2 million for
AL101, $12.4 million for AL002, and $9.2 million for AL003. In addition, we had an increase in research and development expenses of $3.3 million related
to other preclinical programs currently in development. Personnel-related expenses, including stock-based compensation, increased by $3.4 million due to an
increase in headcount, partially offset by a large number of restricted stock awards held by non-employee founders that fully vested in the 2017, which had no
related expense in 2018.

Direct research and development expenses

AL001
AL101
AL002
AL003
Other early stage programs

Indirect research and development expenses
Personnel related (including stock-based
   compensation)
Facilities and other unallocated research and
   development expenses

Total research and development expenses

Year Ended
December 31,

2018

2017
(In thousands)

Dollar
Change

  $

14,531    $
3,159   
15,500   
12,174   
10,980   

3,942    $
—   
3,098   
2,934   
7,729   

10,589 
3,159 
12,402 
9,240 
3,251 

13,066   

9,691   

3,375 

3,621   
73,031    $

2,517   
29,911    $

1,104 
43,120

  $

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General and Administrative Expenses

General and administrative expenses were $11.9 million for the year ended December 31, 2018, compared to $6.5 million for the year ended

December 31, 2017. The increase of $5.4 million was primarily due to a $3.9 million increase in personnel-related expenses, including stock-based
compensation, as a result of an increase in headcount and issuance of option grants to employees in July and November 2018. The increase is also due to a
$1.0 million increase in consulting expense to support the growth of the business related to information technology, human resources, and other
administrative functions.

Other Income, Net

Other income, net was $5.0 million for the year ended December 31, 2018, compared to $0.2 million for the year ended December 31, 2017. The

increase of $4.8 million was due to interest income earned after we invested the majority of the $205.0 million upfront payments from the AbbVie Agreement
and the proceeds from our issuance and sale in April, July, and October 2018 of 9,373,633 shares of our Series E convertible preferred stock into short-term
marketable securities.

Comparison of the Years Ended December 31, 2017 and 2016

Revenue:

Collaboration revenue
Grant revenue

Total revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income, net
Net loss

Year Ended
December 31,

2017

2016
(In thousands)

Dollar
Change

  $

  $

2,872    $
863   
3,735   

29,911   
6,503   
36,414   
(32,679)  
199   
(32,480)   $

—    $
416   
416   

13,674   
1,874   
15,548   
(15,132)  
22   

(15,110)   $

2,872 
447 
3,319 

16,237 
4,629 
20,866 
(17,547)
177 
(17,370)

Revenue

Total revenue was $3.7 million for the year ended December 31, 2017, compared to $0.4 million for the year ended December 31, 2016. The increase
of $3.3 million was primarily due to collaboration revenue recognized from the upfront payment under the AbbVie Agreement. In addition, we received grant
revenue from the U.S. government starting in the second quarter of 2016 compared to a full year of grant revenue in 2017.

Research and Development Expenses

Research and development expenses were $29.9 million for the year ended December 31, 2017, compared to $13.7 million for the year ended
December 31, 2016. The increase of $16.2 million was driven by an increase in expenses for four product candidates that we are preparing for or have entered
into Phase 1 clinical trials and related increase in activities for the manufacturing of clinical materials, including $2.6 million for AL001, $0.8 million for
AL002, and $0.6 million for AL003. Prior to 2017, the costs for AL002 and AL003 were tracked as a single program. In addition, we had an increase in
research and development expenses of $5.2 million related to other preclinical programs. Personnel-related expenses, including stock-based compensation,
increased by $5.6 million due to an increase in headcount. Facilities and other unallocated research and development expenses increased by

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$1.5 million due to our move into new office headquarters at the end of 2016 and depreciation expense related to the purchase of additional property and
equipment for use in our new office headquarters.

Direct research and development expenses

AL001
AL002
AL003
Other early stage programs

Indirect research and development expenses
Personnel related (including stock-based
   compensation)
Facilities and other unallocated research and
   development expenses

Total research and development expenses

Year Ended
December 31,

2017

2016
(In thousands)

Dollar
Change

  $

3,942    $
3,098   
2,934   
7,729   

1,358    $
2,347   
2,347   
2,524   

2,584 
751 
587 
5,205 

9,691   

4,128   

5,563 

2,517   
29,911    $

970   
13,674    $

1,547 
16,237

  $

General and Administrative Expenses

General and administrative expenses were $6.5 million for the year ended December 31, 2017, compared to $1.9 million for the year ended
December 31, 2016. The increase of $4.6 million was primarily due to a $2.4 million increase in legal and accounting professional service fees related to the
Conversion, AbbVie Agreement, and the growth in our operations, a $1.8 million increase in personnel-related expenses, including stock-based
compensation, due to the increase in headcount, and a $0.3 million increase in consulting expense to support our information technology, human resources,
and other administrative functions.

Other Income, Net

Other income, net was $0.2 million for the year ended December 31, 2017, compared to $22,000 for the year ended December 31, 2016. The increase
of $0.2 million was due to interest income earned on investments made from the proceeds of our Series D convertible preferred stock financing, in the fourth
quarter of 2016.

Liquidity and Capital Resources

Since our inception through December 31, 2018, our operations have been financed primarily by net proceeds of $210.5 million from sales of our

preferred units and convertible preferred stock and through the $205.0 million in upfront payments from the AbbVie Agreement. As of December 31, 2018,
we had $290.4 million of cash, cash equivalents, and marketable securities. As of December 31, 2018, we had an accumulated deficit of $114.4 million.

On February 7, 2019, we completed our IPO through issuing and selling 9,739,541 shares of common stock at a public offering price of $19.00 per

share, including 489,541 shares sold pursuant to the underwriters’ partial exercise of their option to purchase additional shares. We received aggregate net
proceeds from the offering, net of underwriting discounts and commissions and estimated offering expenses, of $168.2 million.

Future Funding Requirements

Our primary uses of cash are to fund our operations, which consist primarily of research and development expenditures related to our programs, and

to a lesser extent, general and administrative expenditures. We expect our expenses to continue to increase in connection with our ongoing activities, in
particular as we continue to advance our product candidates and our discovery programs. In addition, we expect to incur additional costs associated with
operating as a public company.

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Based on our current operating plan, we believe that our existing cash, cash equivalents, and marketable securities will enable us to fund our

operating expenses and capital expenditure requirements through at least the next 12 months from the filing date of this Annual Report on Form 10-K. We
have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. We
may also choose to seek additional financing opportunistically. We expect to need to obtain substantial additional funding in the future for our research and
development activities and continuing operations. If we were unable to raise capital when needed or on favorable terms, we would be forced to delay, reduce,
or eliminate our research and development programs or future commercialization efforts.

Our future capital requirements will depend on many factors, including:

•

•

•

•

•

•

•

•

•

•

•

•

the timing and progress of preclinical and clinical development activities;

the number and scope of preclinical and clinical programs we decide to pursue;

successful enrollment in and completion of clinical trials;

our ability to establish agreements with third-party manufacturers for clinical supply for our clinical trials and, if our product candidates are
approved, commercial manufacturing;

our ability to maintain our current research and development programs and establish new research and development programs;

addition and retention of key research and development personnel;

our efforts to enhance operational, financial, and information management systems, and hire additional personnel, including personnel to
support development of our product candidates;

negotiating favorable terms in any collaboration, licensing, or other arrangements into which we may enter and performing our obligations in
such collaborations;

the timing and amount of milestone and other payments we may receive under our collaboration arrangements;

our eventual commercialization plans for our product candidates;

the costs involved in prosecuting, defending, and enforcing patent claims and other intellectual property claims; and

the costs and timing of regulatory approvals.

A change in the outcome of any of these or other variables with respect to the development of any of our product candidates could significantly

change the costs and timing associated with the development of that product candidate. Furthermore, our operating plans may change in the future, and we
may need additional funds to meet operational needs and capital requirements associated with such operating plans.

Cash Flows

The following table summarizes our cash flows for the periods indicated (in thousands):

Cash provided by (used in) operating activities
Cash used in investing activities
Cash provided by (used in) financing activities

Operating Activities

  $

2018

Year Ended December 31,
2017

2016

127,464    $
(224,119)  
131,146   

(17,771)   $
(801)  
(15)  

(12,993)
(2,250)
(77)

For the year ended December 31, 2018, cash provided by operating activities was $127.5 million. The net cash inflow from operations primarily

resulted from the receipt of a $200.0 million upfront payment from AbbVie in January 2018, that was reflected as a net increase in deferred revenue of $172.5
million during the period. This was

100

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
mainly offset by net loss of $52.2 million. In addition, the company had a non-cash charge of $6.9 million for stock-based compensation. 

For the year ended December 31, 2017, cash used in operating activities was $17.8 million. The net cash outflow from operations primarily resulted
from our net loss of $32.5 million offset by a non-cash charge of $6.0 million and an increase in net operating assets and liabilities of $8.7 million. The non-
cash charge consisted primarily of $5.4 million for stock-based compensation. The increase in net operating assets and liabilities of $8.7 million was primarily
due to the $6.7 million increase in accrued liabilities and accrued clinical supply costs from growth of our business and commencement of manufacturing
activities in 2017 and $2.1 million increase in deferred revenue from receiving an upfront payment of $5.0 million in October 2017 from our collaboration
with AbbVie offset by the revenue recognized.

For the year ended December 31, 2016, cash used in operating activities was $13.0 million. The net cash outflow from operations primarily resulted

from our net loss of $15.1 million offset by a non-cash charge of $2.0 million for stock-based compensation. Net operating assets and liabilities did not
change significantly during the period due to offsetting small increases and decreases in the operating accounts.

Investing Activities

For the year ended December 31, 2018, cash used in investing activities of $224.1 million was primarily related to the purchase of short-term

marketable securities of $472.2 million offset by the proceeds from maturities of marketable securities of $250.0 million. In addition, we used cash for the
purchase of $1.9 million of property and equipment.

For the years ended December 31, 2017 and 2016, cash used in investing activities of $0.8 million and $2.3 million, respectively, was related to the

purchase of property and equipment.

Financing Activities

For the year ended December 31, 2018, cash provided by financing activities of $131.1 million was from net proceeds of the issuance of 9,373,633
shares of our Series E convertible preferred stock in April 2018, July, and October 2018, offset by payment of $1.9 million of deferred offering costs for our
IPO.

For the year ended December 31, 2017, cash used in financing activities was less than $0.1 million for payments of issuance costs for our Series E

convertible preferred stock.

For the year ended December 31, 2016, cash used in financing activities was $0.1 million for payments of issuance costs for our Series D convertible

preferred units, which subsequently converted into convertible preferred stock.

Contractual Obligations and Other Commitments

The following table summarizes our commitments and contractual obligations as of December 31, 2018 (in thousands):

Contractual Obligations:
Operating lease obligations

Less Than
1 Year

1 to 3
Years

Payments Due by Period
3 to 5
Years

More Than
5 Years

Total

  $

3,231    $

14,004    $

14,522    $

43,146    $

74,903

In June 2018, we signed a lease agreement to lease approximately 105,000 square feet in a new office in South San Francisco at a cost of

$73.9 million over a ten-year term. This will serve as the location of our new headquarters when the lease for our current headquarters location ends in April
2019.

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Pursuant to our license agreement with Adimab, we have obligations to make future milestone and royalty payments. We will owe up to $3.5 million
in milestone payments per program to Adimab for our product candidates. We will also owe low- to mid- single-digit royalty payments for commercial sales
of such product candidates. Due to the contingent nature of the milestone and royalty payments, they are not included in the table above.

We have also entered into development and manufacturing services agreements with multiple contract manufacturers for the development and

manufacture of biologic products, the amount and timing of which may vary based on the timing of services.

Off-Balance Sheet Arrangements

We have not entered into any off-balance sheet arrangements and do not have any holdings in variable interest entities.

Critical Accounting Polices and Estimates

Management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which
have been prepared in accordance with generally accepted accounting principles in the United States (GAAP). The preparation of these financial statements
requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at
the date of the financial statements, as well as the reported revenue generated and expenses incurred during the reporting periods. Our estimates are based on
our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making
judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates
under different assumptions or conditions and any such differences may be material. We believe that the accounting policies discussed below are critical to
understanding our historical and future performance, as these policies relate to the more significant areas involving management’s judgments and estimates.

Revenue Recognition

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606). We

have early adopted the new standard using the full retrospective method effective January 1, 2017, which retrospectively applied the standard to all prior
periods presented. Under ASC 606, an entity recognizes revenue when control of promised goods or services are transferred to customers in an amount that
reflects the consideration that is expected to be received for those goods or services. In determining the appropriate amount of revenue to be recognized as we
fulfill our obligations under arrangements, we perform the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance
obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and
(v) recognize revenue when (or as) the entity satisfies the performance obligation.

Collaboration Revenue

We signed the AbbVie Agreement to co-develop antibodies to two program targets in preclinical development. Under the terms of the AbbVie

Agreement, AbbVie made $205.0 million in upfront payments, of which $5.0 million and $200.0 million was received by us in October 2017 and January
2018, respectively. We will perform research and development services for the antibodies in the two programs through the end of Phase 2 clinical trials.
AbbVie will then have the exclusive right to exercise an option to enter into a license and collaboration agreement with us for one or both programs. If
AbbVie exercises its option for a program, AbbVie will take over the development of the product candidates for such program and costs will be split between
the parties. We will also share in profits and losses upon commercialization of any products from such program. However, following AbbVie’s exercise of its
option for a program, we may opt out of sharing in development costs and profits or losses for that program and instead receive a tiered royalty. Additionally,
under the terms of the AbbVie Agreement, if AbbVie exercises both of its options, and both programs meet all milestones, we are eligible to earn up to an
additional $985.6 million in milestone payments and option-exercise fees. We assessed the AbbVie Agreement in accordance with ASC 606 and concluded
that AbbVie is a customer.

102

 
We have determined that there are two research and development performance obligations as part of the agreement with AbbVie, one research and

development performance obligation for each of the two programs. The non-refundable upfront cash payment of $5.0 million and $200.0 million received in
October 2017 and January 2018, respectively, was included in the transaction price. None of the remaining development and regulatory milestone and
program opt-in payment amounts have been included in the transaction price, as all these amounts were fully constrained as of December 31, 2018. As part of
our evaluation of the constraint, we considered numerous factors, including that receipt of the milestone amounts is outside of our control and contingent
upon success in future clinical trials. Any consideration related to royalties on net product sales will be recognized when the related sales occur and therefore
have also been excluded from the transaction price. We will re-evaluate the transaction price in each reporting period and as uncertain events are resolved or
other changes in circumstances occur.

We recognize collaboration revenue by measuring the progress toward complete satisfaction of the performance obligation using an input measure. In
order to recognize revenue over the research and development period, we measure actual costs incurred to date compared to the overall total expected costs to
satisfy the performance obligation. Revenues are recognized as the program costs are incurred. We will re-evaluate the estimate of expected costs to satisfy
the performance obligation each reporting period and make adjustments for any significant changes. We recorded deferred revenue of $174.6 million as of
December 31, 2018. The deferred revenue is expected to be recognized over the research and development period of the programs through the completion of
Phase 2 clinical trials.

Accrued Research and Development Expenses

We record accrued expenses for estimated preclinical study and clinical trial expenses. Estimates are based on the services performed pursuant to

contracts with research institutions, contract research organizations in connection with clinical studies, investigative sites in connection with clinical studies,
vendors in connection with preclinical development activities, and contract manufacturing organizations in connection with the production of materials for
clinical trials. Further, we accrue expenses related to clinical trials based on the level of patient enrollment and activity according to the related agreement. We
monitor patient enrollment levels and related activity to the extent reasonably possible and make judgments and estimates in determining the accrued balance
in each reporting period. If we underestimate or overestimate the level of services performed or the costs of these services, our actual expenses could differ
from our estimates. To date, we have not experienced significant changes in our estimates of preclinical studies and clinical trial accruals.

Stock-based Compensation

Stock-based compensation is measured at the date of grant, based on the estimated fair value of the award and recognized as an expense over the

employee’s requisite service period (usually the vesting period) on a straight-line basis. We estimate the grant date fair value, and the resulting stock-based
compensation, using the Black-Scholes option-pricing model.

After the adoption of ASU No. 2018-07, beginning July 1, 2018, we account for stock-based compensation arrangements with non-employees in a
similar manner as employees and no longer need to remeasure the awards each period. We can choose to use the expected life or the contractual term on an
award-by-award basis. The fair value of these options is measured using the Black-Scholes option-pricing model reflecting the same assumptions as applied
to employee options in each of the reported periods. We adjust for actual forfeitures as they occur for both employees and nonemployees.

We recorded stock-based compensation of $6.9 million, $5.4 million, and $2.0 million for the years ended December 31, 2018, 2017, and 2016,

respectively. As of December 31, 2018, we had $8.5 million of unrecognized stock-based compensation related to unvested restricted common stock, which
we expect to recognize over a weighted-average period of 2.4 years, and $28.9 million of unrecognized stock-based compensation related to unvested stock
options, which we expect to recognize over a remaining weighted-average period of 3.6 years.

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The Black-Scholes option-pricing model requires the use of highly subjective assumptions which determine the fair value of stock-based awards.

These assumptions include:

Expected Term—The expected term represents the period that stock-based awards are expected to be outstanding. Our profit interest units did not
have a contractual term. However, we estimated a constructive maturity of the profit interest units based on the expected exit or liquidity scenarios for
Alector. Our historical share option exercise is limited due to a lack of sufficient data points and did not provide a reasonable basis upon which to
estimate an expected term. The expected term for stock options was derived by using the simplified method which uses the midpoint between the
average vesting term and the contractual expiration period of the stock-based award.

Expected Volatility—We have limited information on the volatility of our stock as shares of our common stock were not actively traded on any public
markets prior to February 7, 2019. The expected volatility was derived from the historical stock volatilities of comparable peer public companies
within our industry.

Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the measurement date with maturities
approximately equal to the expected term.

Expected Dividend—The expected dividend rate is zero because we have not historically paid and do not expect for the foreseeable future to pay a
dividend on our common stock.

Prior to the Conversion of Alector LLC into Alector, Inc., Alector LLC had issued profit interest units to employees. The profit interest units had a

“strike price” and are economically similar to a stock option with an exercise price. In the event of a distribution by Alector LLC, the proceeds distributed to
the holder would be reduced by the strike price. The strike price was established pursuant to the terms of the Alector LLC operating agreement. For
accounting purposes, we measured the fair value of the profit units based on valuations of our common stock prepared by an unrelated third-party valuation
firm in accordance with the guidance provided by the American Institute of Certified Public Accountants Practice Guide, Valuation of Privately-Held-
Company Equity Securities Issued as Compensation, and the application of the Black-Scholes option-pricing model.

Our vested profit interest units converted on a net issuance basis into shares of common stock and the unvested profit interest units converted on a net

issuance basis into restricted common stock. All vesting provisions remained the same following the Conversion. We continue to record stock-based
compensation for the restricted stock over the vesting period based on the grant-date fair value.

After the conversion, the fair values of the shares of common stock underlying our stock-based awards were estimated on each grant date by our

board of directors. In order to determine the fair value of our common stock, our board of directors considered, among other things, contemporaneous
valuations of our common stock prepared by an unrelated third-party valuation firm in accordance with the guidance provided by the American Institute of
Certified Public Accountants Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation.

For our valuations performed prior to December 31, 2017, we used the OPM backsolve method. In an option pricing method (OPM) framework, the

backsolve method for inferring the equity value implied by a recent financing transaction involves making assumptions for the expected time to liquidity,
volatility, and risk-free rate and then solving for the value of equity such that value for the most recent financing equals the amount paid. This method was
selected as management concluded that the contemporaneous financing transaction was an arm’s-length transaction. We performed a valuation
contemporaneously with the issuance of our Series D preferred units in December 2015. We also performed a valuation contemporaneously with our
Conversion in October 2017 based on term sheets for an anticipated Series E preferred stock financing. As of these valuation dates, we were at an early stage
of development and future liquidity events were difficult to forecast.

For our valuations performed starting April 2018, equity value was allocated using the OPM and the Probability Weighted Expected Return Method

(PWERM) or the hybrid method. The hybrid method applied the PWERM utilizing the probability of going public and the OPM was utilized in the remaining
private scenario. The hybrid method was used commencing April 2018, because of a near-term potential IPO scenario that also factored in the inherent
uncertainty associated with being able to complete an IPO. We performed valuations

104

 
contemporaneously with the April 2018 and July 2018 issuances of our Series E preferred stock. We also performed a valuation as of September 30, 2018.

For valuations after the completion of the IPO, our board of directors determines the fair value of each share of underlying common stock based on

the closing price of our common stock as reported on the NASDAQ Global Select Market on the date of grant.

JOBS Act

We are an emerging growth company, as defined in the JOBS Act. Under the JOBS Act, emerging growth companies may delay adopting new or
revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. We have
irrevocably elected not to avail ourselves of this exemption from new or revised accounting standards and, therefore, will be subject to the same new or
revised accounting standards as other public companies that are not emerging growth companies.

We will remain an emerging growth company until the earliest of (i) the last day of our first fiscal year in which we have total annual gross revenues

of $1.07 billion or more, (ii) the date on which we are deemed to be a “large accelerated filer” under the rules of the SEC with at least $700.0 million of
outstanding equity securities held by non-affiliates, (iii) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the
previous three years, or (iv) the last day of our fiscal year following the fifth anniversary of the date of the completion of our IPO.

Recent Accounting Pronouncements

In February 2016, the FASB issued Accounting Standards Update (ASU) No. 2016-02, Leases (ASU 2016-02). The new standard requires lessees to

apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed
purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis
over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months
regardless of their classification. We will make an accounting policy election to account for leases with a term of 12 months or less similar to existing
guidance for operating leases. We will adopt the new standard effective January 1, 2019 on a modified retrospective basis and will not restate comparative
periods. Management estimates that the adoption of this standard will result in recognition of approximately $27 – $33 million as a right-of-use asset for
leased facilities and recognition of approximately $44 – $50 million as a corresponding liability for the lease payments remaining on the lease less tenant
improvement incentives on the consolidated balance sheets as of March 31, 2019. Management does not expect a material change to the consolidated
statement of operations and comprehensive loss or cash flows.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

We are exposed to market risks in the ordinary course of our business. These risks primarily include interest rate sensitivities. The primary objective

of our investment activities is to preserve capital to fund our operations. We also seek to maximize income from our investments without assuming significant
risk. To achieve our objectives, we maintain a portfolio of investments in a variety of securities of high credit quality and short-term duration, invested in
compliance with our policy.  

We had cash, cash equivalents, and marketable securities of $290.4 million as of December 31, 2018, which consisted primarily of bank deposits,

money market funds, and short-term government marketable securities. Such interest-earning instruments carry a degree of interest rate risk; however,
historical fluctuations in interest income have not been significant for us. Due to the short-term maturities of our cash equivalents and marketable securities,
and the low risk profile of our marketable securities, an immediate 100 basis point change in interest rates would not have a material effect on the fair market
value of our cash equivalents and marketable securities.

105

 
Foreign Currency Risk

Our expenses are generally denominated in U.S. dollars. However, we have entered into a limited number of contracts with vendors for research and
development services with payments denominated in foreign currencies, including the Euro. We are subject to foreign currency transaction gains or losses on
our contracts denominated in foreign currencies. To date, foreign currency transaction gains and losses have not been material to our financial statements, and
we have not had a formal hedging program with respect to foreign currency. A 10% increase or decrease in current exchange rates would not have a material
effect on our financial results.

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Item 8. Financial Statements and Supplementary Data.

ALECTOR, INC.
INDEX TO FINANCIAL STATEMENTS

Audited Consolidated Financial Statements
Report of Independent Registered Public Accounting Firm
Consolidated Balance Sheets
Consolidated Statements of Operations and Comprehensive Loss
Consolidated Statement of Convertible Preferred Stock and Stockholders’ Deficit
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

107

  Page

108
109
110
111
112
113

 
 
 
 
 
 
 
 
 
 
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Alector, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Alector, Inc. (the “Company”) as of December 31, 2018 and 2017, the related consolidated
statements of operations and comprehensive loss, stockholders’ deficit and cash flows for the each of the three years in the period ended December 31, 2018,
and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly,
in all material respects, the financial position of the Company at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of
the three years in the period ended December 31, 2018, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial
statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States)
(“PCAOB”) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and
regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor
were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of
internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial
reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and
performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the
financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating
the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP
We have served as the Company’s auditor since 2017.

San Jose, California
March 26, 2019

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ALECTOR, INC.

Consolidated Balance Sheets
(In thousands, except share and per share data)

ASSETS
CURRENT ASSETS:

Cash and cash equivalents
Marketable securities
Receivable from collaboration partner
Accounts receivable
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Restricted cash
Other assets
TOTAL ASSETS

LIABILITIES, CONVERTIBLE PREFERRED STOCK, AND
   STOCKHOLDERS’ DEFICIT
CURRENT LIABILITIES:

Accounts payable
Accrued clinical supply costs
Accrued liabilities
Deferred revenue, current portion
Deferred rent, current portion
Total current liabilities
Deferred revenue, long-term portion
Deferred rent, long-term portion
Other long-term liabilities
TOTAL LIABILITIES
Commitments and Contingencies (Note 5)
Convertible preferred stock; $0.0001 par value; 45,849,677 and 36,001,203
   shares authorized as of December 31, 2018 and 2017, respectively;
   45,374,836 and 36,001,203 shares issued and outstanding as of
   December 31, 2018 and 2017, respectively; liquidation preference of
   $211,054 as of December 31, 2018
STOCKHOLDERS’ DEFICIT:
Common stock, $0.0001 par value; 65,000,000 and 52,000,000 shares
   authorized as of December 31, 2018 and 2017, respectively; 13,764,829
   and 13,776,153 shares issued and outstanding as of December 31, 2018
   and 2017, respectively
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
TOTAL STOCKHOLDERS’ DEFICIT
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK, AND
   STOCKHOLDERS’ DEFICIT

  $

  $

  $

December 31,

2018

2017

65,470    $

224,938   
—   
—   
2,768   
293,176   
10,937   
1,472   
2,774   
308,359    $

126    $

4,463   
8,439   
34,905   
15   
47,948   
139,715   
7,478   
96   
195,237   

32,451 
— 
200,000 
238 
285 
232,974 
2,834 
— 
252 
236,060 

1,140 
3,820 
3,455 
18,978 
10 
27,403 
183,150 
41 
14 
210,608 

210,520   

77,485 

1   
17,078   
(42)  
(114,435)  
(97,398)  

1 
10,153 
— 
(62,187)
(52,033)

  $

308,359    $

236,060

The accompanying notes are an integral part of these consolidated financial statements.

109

 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ALECTOR, INC.

Consolidated Statements of Operations and Comprehensive Loss
(In thousands, except share and per share data)

Revenue:

Collaboration revenue
Grant revenue

Total revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income, net
Net loss
Unrealized loss on marketable securities
Comprehensive loss

Net loss per share, basic and diluted

2018

Year Ended December 31,
2017

2016

  $

  $

  $

27,508    $
169   
27,677   

73,031   
11,934   
84,965   
(57,288)  
5,040   
(52,248)  
(42)  
(52,290)   $

(4.62)   $

2,872    $
863   
3,735   

29,911   
6,503   
36,414   
(32,679)  
199   
(32,480)  
—   
(32,480)   $

(3.55)   $

— 
416 
416 

13,674 
1,874 
15,548 
(15,132)
22 
(15,110)
— 
(15,110)

(2.11)

Shares used in computing net loss per share, basic and diluted

11,302,788   

9,142,688   

7,173,441

The accompanying notes are an integral part of these consolidated financial statements.

110

 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ALECTOR, INC.

Consolidated Statement of Convertible Preferred Stock and Stockholders’ Deficit
(In thousands, except member unit and share data)

Preferred Units
Units

    Amount    

Convertible
Preferred Stock

Shares

    Amount      

Common Units
Units

    Amount    

Additional
Paid-In
Capital

Accumulated
Other
Comprehensive
Loss

Accumulated
Deficit

Total
Stockholders’
Deficit

Common Stock

Shares

    Amount      

Balance —
December 31,
2015

    36,001,203    $ 77,485     

—    $

—        10,707,167    $ —     

—    $ —    $

2,837    $

—    $

(14,597)   $

(11,760)

—     

—     

—     

—       

1,136,500      —     

—      —     

—     

—     

—     

—     

—     

—     

—     

—     

—     

—       

(326,082)     —     

—      —     

—     

—       

—      —     

—      —     

1,963     

—     

—     

—     

—     

1,963 

—     

—     

—     

—       

—      —     

—      —     

—     

—     

(15,110)    

(15,110)

    36,001,203      77,485     

—        11,517,585      —     

—      —     

4,800     

—     

(29,707)    

(24,907)

—     

—     

—       

2,483,500      —     

—      —     

—     

—     

—     

—     

—     

—     

—     

—     

—       

(8,333)     —     

—      —     

—     

—     

—     

— 

— 

— 

— 

    (36,001,203)     (77,485)     36,001,203      77,485        (13,992,752)     —      13,825,387     

1     

(1)    

—     

—     

— 

—     

—     

—     

—     

—     

—     

—       

—       

—      —     

(49,234)     —     

—     

—      —     

—      —     

5,354     

—     

—     

—     

— 

—     

5,354 

—     

—     

—     

—       

—      —     

—      —     

—     

—     

(32,480)    

(32,480)

—     

—      36,001,203      77,485       

—      —      13,776,153     

1      10,153     

—     

(62,187)    

(52,033)

—     

—      9,373,633      133,035       

—      —     

—      —     

—     

—     

—     

— 

—     

—     

—     

—     

—     

—     

—       

—       

—      —     

(11,324)     —     

—     

—      —     

—      —     

6,925     

—     

—     

—     

— 

—     

6,925 

—     
—     

—     
—     

—     
—     

—       
—       

—      —     
—      —     

—      —     
—      —     

—     
—     

(42)    
—     

—     
(52,248)    

(42)
(52,248)

—    $

—      45,374,836    $ 210,520       

—    $ —      13,764,829    $

1    $ 17,078    $

(42)   $ (114,435)   $

(97,398)

The accompanying notes are an integral part of these consolidated financial statements.

111

Issuance of
common units    
Cancellation
of common
units
Stock-based
compensation    
Net loss and
comprehensive
loss
Balance —
December 31,
2016

Issuance of
common units    
Cancellation
of common
units
Conversion
from LLC to
corporation
   (Note 1)
Cancellation
of restricted
common
   stock post-
conversion
Stock-based
compensation    
Net loss and
comprehensive
loss
Balance —
December 31,
2017

Issuance of
Series E
convertible
   preferred
stock, net of
issuance
   costs of
$214
Cancellation
of restricted
common
   stock
Stock-based
compensation    
Accumulated
other
comprehensive
   loss
Net loss
Balance —
December 31,
2018

 
 
 
 
   
     
   
   
   
   
   
 
 
 
 
     
 
     
 
     
 
 
   
   
   
   
   
   
   
   
   
   
   
 
 
 
 
ALECTOR, INC.

Consolidated Statements of Cash Flows
(In thousands)

CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss
Adjustments to reconcile net loss to net cash used in operating
   activities:

Depreciation and amortization
Stock-based compensation
Accretion of discount on marketable securities
Loss from disposal of property and equipment, net
Changes in operating assets and liabilities:

Accounts receivable
Prepaid expenses and other current assets
Other assets
Accounts payable
Accrued liabilities and accrued clinical supply costs
Deferred revenue
Deferred rent
Other long-term liabilities

Net cash provided by (used in) operating activities

CASH FLOWS FROM INVESTING ACTIVITIES:

Purchase of property and equipment
Purchase of marketable securities
Maturities of marketable securities

Net cash used in investing activities
CASH FLOWS FROM FINANCING ACTIVITIES:

Proceeds from issuance of convertible preferred stock, net of
   issuance costs
Payment of deferred offering costs for initial public offering

Net cash provided by (used in) financing activities
Net increase (decrease) in cash, cash equivalents, and restricted cash
Cash, cash equivalents, and restricted cash at beginning of period
Cash, cash equivalents, and restricted cash at end of period

NON-CASH INVESTING AND FINANCING ACTIVITIES:

Property and equipment purchases included in accounts
   payable and accrued liabilities

Issuance costs for convertible preferred stock included in
   accounts payable

Deferred offering costs for initial public offering included in accrued liabilities

Tenant improvements paid by landlord

2018

Year Ended December 31,
2017

2016

  $

(52,248)   $

(32,480)   $

(15,110)

1,019   
6,925   
(2,745)  
151   

238   
(2,483)  
106   
(809)  
4,743   
172,492   
(7)  
82   
127,464   

(1,884)  
(472,235)  
250,000   
(224,119)  

680   
5,354   
—   
—   

(20)  
(150)  
—   
(41)  
6,716   
2,128   
28   
14   
(17,771)  

(801)  
—   
—   
(801)  

133,050   
(1,904)  
131,146   
34,491   
32,451   
66,942    $

(15)  
—   
(15)  
(18,587)  
51,038   
32,451    $

293    $

353    $

—    $

792    $

7,449    $

53    $

—    $

—    $

  $

  $

  $

  $

  $

201 
1,963 
— 
— 

(218)
(22)
(184)
708 
(354)
— 
23 
— 
(12,993)

(2,250)
— 
— 
(2,250)

(77)
— 
(77)
(15,320)
66,358 
51,038 

176 

— 

— 

—

The accompanying notes are an integral part of these consolidated financial statements.

112

 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
1.

The Company and Liquidity

Alector, Inc. (“Alector” or the “Company”) is a Delaware corporation headquartered in South San Francisco, California. Alector is a biotechnology
company focused on harnessing the immune system to cure neurodegenerative diseases.

Conversion

Alector was originally formed in May 2013 as a Delaware limited liability company under the name Alector LLC. In October 2017, the Company
completed a reorganization whereby the Company converted from a Delaware limited liability company named Alector LLC to a Delaware
corporation named under the name Alector, Inc. (the “Conversion”). In conjunction with the Conversion, (i) all of the Company’s outstanding
common units converted on a 1-for-1 basis into shares of common stock, par value $0.0001; (ii) all of the Company’s outstanding preferred units
converted on a 1-for-1 basis into shares of convertible preferred stock, par value $0.0001; and (iii) the Company’s 202,924 unvested restricted units
converted on a 1-for-1 basis into shares of unvested restricted common stock. Prior to the Conversion, the Company had issued profit interest units to
employees. The Company’s vested profit interest units converted on a net issuance basis into shares of common stock and the Company’s unvested
profit interest units converted on a net issuance basis into restricted common stock. Fractional shares related to the conversion of profit interest grants
were settled in cash. All vesting provisions remained the same following the Conversion.

Initial Public Offering

On February 7, 2019, the Company completed an initial public offering (“IPO”) through issuing and selling 9,739,541 shares of common stock at a
public offering price of $19.00 per share, including 489,541 shares sold pursuant to the underwriters’ partial exercise of their option to purchase
additional shares. The aggregate net proceeds received by the Company from the offering, net of underwriting discounts and commissions and
estimated offering expenses, were $168.2 million. Upon the closing of the IPO, all of the outstanding shares of convertible preferred stock
automatically converted into shares of common stock. Subsequent to the closing of the IPO, there were no shares of convertible preferred stock
outstanding.

2.

Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the United States (“GAAP”)
as defined by the Financial Accounting Standards Board (“FASB”). The consolidated financial statements include the accounts of Alector, Inc. and its
wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect
the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and
the reported amounts of revenue and expense during the reporting period. The Company evaluates its estimates, including those related to revenue
recognition, manufacturing accruals, clinical accruals, fair value of assets and liabilities, income taxes uncertainties, stock-based compensation, and
related assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and
circumstances dictate. Actual results could materially differ from those estimates.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, and
short-term marketable securities. Cash and cash equivalents are

113

 
deposited in checking and sweep accounts at a financial institution. Such deposits may, at times, exceed federally insured limits.

Cash, Cash Equivalents, and Restricted Cash

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash and cash
equivalents. Cash equivalents, which consist of amounts invested in money market funds, are stated at fair value. There are no unrealized gains or
losses on the money market funds for the periods presented.

Restricted cash as of December 31, 2018 relates to a letter of credit established for a lease entered into in June 2018.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to
the total of the same amounts shown in the consolidated statements of cash flows:

Cash and cash equivalents
Restricted cash

Total cash, cash equivalents, and restricted cash

Marketable Securities

2018

Year Ended December 31,
2017
(In thousands)

2016

  $

  $

65,470    $
1,472   
66,942    $

32,451    $
—   
32,451    $

50,838 
200 
51,038

All marketable securities have been classified as “available-for-sale” and are carried at fair value, based upon quoted market prices. The Company
considers its available-for-sale portfolio as available for use in current operations. Accordingly, the Company may classify certain investments as
short-term marketable securities, even though the stated maturity date may be one year or more beyond the current balance sheet date. Unrealized
gains and losses, net of any related tax effects, are excluded from earnings and are included in other comprehensive income and reported as a separate
component of stockholders’ deficit until realized. Interest income, realized gains and losses, and declines in value judged to be other than temporary,
if any, on available-for-sale securities are included in other income, net. The cost of securities sold is based on the specific-identification method. The
amortized cost of securities is adjusted for amortization of premiums and accretion of discounts to maturity. In accordance with our investment
policy, management only invests in money market funds and U.S. treasury securities. The Company has not experienced any losses on its deposits of
cash, cash equivalents, and marketable securities.

The Company periodically evaluates whether declines in the fair value of our investments below their cost are other than temporary. This evaluation
consists of qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as our ability and intent to hold the
marketable securities until a forecasted recovery occurs. If it is determined that the decline in fair value of an investment is below its accounting basis
and this decline is other than temporary, the Company would reduce the carrying value of the security and record a loss for the amount of such
decline. The Company has not recorded any realized losses or declines in value judged to be other than temporary on any investments.

Fair Value of Financial Instruments

The Company’s financial instruments include cash and cash equivalents, receivables, accounts payable, and accrued liabilities. The Company’s
financial instruments approximate fair value due to their relatively short maturities.

The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent
possible. The Company determines the fair value of its financial instruments based on assumptions that market participants would use in pricing an
asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value

114

 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the
following levels:

Level 1 – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date;

Level 2 – Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for
identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable
market data for substantially the full term of the related assets or liabilities; and

Level 3 – Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little or
no market data.

Property and Equipment

Property and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization is computed using the
straight-line method over the estimated useful lives of the respective assets, generally three to five years. Leasehold improvements are amortized over
the lesser of their useful lives or the remaining life of the lease. When assets are retired or otherwise disposed of, the cost and related accumulated
depreciation and amortization are removed from the consolidated balance sheet and the resulting gain or loss is reflected in the consolidated
statements of operations in the period realized. Maintenance and repairs are charged to the consolidated statements of operations as incurred.

Impairment of Long-Lived Assets

The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset
may not be recoverable. Recoverability is measured by comparing the carrying amount to the future net undiscounted cash flows which the assets are
expected to generate. If the total of the undiscounted future cash flows is less than the carrying amount of the assets, an impairment loss is recognized
for the amount by which the carrying amount of the assets exceeds is fair value. The Company has not identified any such impairment losses to date.

Revenue Recognition

The Company early adopted the new revenue accounting standard (“ASC 606”) using the full retrospective method effective January 1, 2017, which
retrospectively applied the standard to all prior periods presented. Under ASC 606, an entity recognizes revenue when control of promised goods or
services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. In
determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under arrangements, the Company performs
the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction
price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the entity satisfies the
performance obligation.  

Collaboration Revenue

The Company signed an agreement in October 2017 with AbbVie to co-develop antibodies to two program targets in preclinical development. Under
the terms of the agreement, AbbVie made $205.0 million in upfront payments, of which $5.0 million and $200.0 million was received by the
Company in October 2017 and January 2018, respectively. The Company will perform research and development services for the antibodies to the
two programs through the end of Phase 2 clinical trials which the Company expects to conduct through 2023. AbbVie will then have the exclusive
right to exercise an option to enter into a license and collaboration agreement with the Company for one or both of the programs for $250.0 million
each. If AbbVie exercises its option for the programs, AbbVie will take over the development of the product candidates for such program and costs
will be split between the parties. The Company will also share in profits and losses upon commercialization of any products from such program.
However, following AbbVie’s exercise of its option

115

 
for a program, the Company may opt out of sharing in development costs and profits or losses for that program and instead receive tiered royalties.
Additionally, under the terms of the agreement, the Company will be eligible to earn up to an additional $242.8 million in milestone payments per
program related to the initiation of certain clinical studies and regulatory approval for up to three indications per program. The Company assessed its
collaboration agreement with AbbVie in the context of the delivery of the research and development services.

The Company has determined that there are two research and development performance obligations as part of the agreement with AbbVie, one
research and development performance obligation for each of the two research and development programs. The non-refundable upfront cash
payments of $5.0 million and $200.0 million received in October 2017 and January 2018, respectively, were included in the transaction price. None
of the remaining development and regulatory milestone and program opt-in payment amounts have been included in the transaction price, as all these
amounts were fully constrained as of December 31, 2018. As part of the Company’s evaluation of the constraint, the Company considered numerous
factors, including that receipt of the milestone amounts is outside the control of the Company and contingent upon success in future clinical trials.
Any consideration related to royalties on net product sales will be recognized when the related sales occur and therefore have also been excluded
from the transaction price. The Company will re-evaluate the transaction price in each reporting period and as uncertain events are resolved or other
changes in circumstances occur.

The Company recognizes collaboration revenue by measuring the progress toward complete satisfaction of the performance obligation using an input
measure. In order to recognize revenue over the research and development period, the Company measures actual costs incurred to date compared to
the overall total expected costs to satisfy the performance obligation. Revenues are recognized as the program costs are incurred. The Company will
re-evaluate the estimate of expected costs to satisfy the performance obligation each reporting period and make adjustments for any significant
changes. Collaboration revenue under the Company’s collaboration agreement with AbbVie during 2018 and 2017 was $27.5 million and
$2.9 million, respectively. All revenue recognized during the year ended December 31, 2018, was included in deferred revenue at the beginning of the
period. The Company recorded deferred revenue of $174.6 million as of December 31, 2018. The deferred revenue is expected to be recognized over
the research and development period of the programs through the completion of Phase 2 clinical trials.

Grant Revenue

The Company has grant revenue from the U.S. government. In March 2016, the National Institute on Aging, a division of the National Institute of
Health of the U.S. government, awarded the Company a Small Business Innovation Research grant. The Company recognized $0.2 million,
$0.9 million, and $0.4 million for the years ended December 31, 2018, 2017, and 2016, respectively, related to research performed under the grant.
The Company recognizes grant revenue as the related research services are performed.

Research and Development Costs

Research and development costs are expensed as incurred and consist primarily of new product development. Research and development costs
include salaries and benefits, consultants’ fees, process development costs, stock-based compensation, and laboratory supplies, as well as fees paid to
third parties that conduct certain research and development activities on the Company’s behalf. In addition, research and development costs include
the reimbursable costs incurred for the grant agreements, which includes payroll costs for time incurred on projects, laboratory supplies, and third-
party research and development activities.

A substantial portion of the Company’s ongoing research and development activities are conducted by third-party service providers. The Company
records accrued expenses for estimated preclinical study and clinical trial expenses. Estimates are based on the services performed pursuant to
contracts with research institutions, contract research organizations in connection with clinical studies, investigative sites in connection with clinical
studies, vendors in connection with preclinical development activities, and contract manufacturing organizations in connection with the production of
materials for clinical trials. Further, the Company accrues expenses related to clinical trials based on the level of patient enrollment and activity
according to the related agreement. The Company monitors patient enrollment levels and related activity to the extent reasonably

116

 
possible and make judgments and estimates in determining the accrued balance in each reporting period. If the Company underestimates or
overestimates the level of services performed or the costs of these services, actual expenses could differ from estimates. To date, the Company has not
experienced significant changes in its estimates of preclinical studies and clinical trial accruals.

Stock-based Compensation

Stock-based compensation for employee awards is measured on the grant date based on the fair value of the award and recognized on a straight-line
basis over the requisite service period. The fair value of options to purchase common stock are measured using the Black-Scholes option-pricing
model. The Company accounts for forfeitures as they occur.

The Company adopted ASU No. 2018-07, Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”) in June 2018. The
new standard simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to
employees. The Company early adopted ASU 2018-07 effective July 1, 2018. The early adoption of this new standard did not have a material impact
on the Company’s consolidated financial statements.

Comprehensive Loss

Comprehensive loss includes net loss and certain changes in stockholders’ equity that are the result of transactions and economic events other than
those with stockholders. The Company’s only element of other comprehensive loss was net unrealized losses on marketable securities.

Income Taxes

The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for
the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and
liabilities are determined on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax
rates in effect for the year in which the differences are expected to recover or settle. The effect of a change in tax rates on deferred tax assets and
liabilities is recognized in income in the period that includes the enactment date.

The deferred tax assets are recognized to the extent the Company believes that these assets are more likely than not to be realized. A valuation
allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. Due to the Company’s
historical operating performance and the recorded cumulative net losses in prior fiscal periods, the net deferred tax assets have been fully offset by a
valuation allowance.

The Company records uncertain tax positions using a two-step process. First, the Company determines whether it is more likely than not that the tax
positions will be sustained on the basis of the technical merits of the position. Second, for those tax positions that meet the more-likely-than-not
recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50% likely to be realized upon ultimate settlement
with the related tax authority.

The Company recognizes interest and penalties related to unrecognized tax benefits on the interest expense line and other expense line, respectively,
in the accompanying statements of operations. Accrued interest and penalties are included on the related liability lines in the balance sheet.

Employee 401(k) Plan

The Company has a qualified contributory savings plan under Section 401(k) of the Internal Revenue Code (the “Code”) covering substantially all
U.S. employees of Alector. The 401(k) plan is designed to provide tax-deferred retirement benefits in accordance with the provisions of
Section 401(k) of the Code. Eligible employees may defer up to 100% of their eligible compensation up to the annual maximum as determined by

117

 
the Internal Revenue Service. The Company’s contributions to the plan are discretionary. For the years ended December 31, 2018 and 2017, the
Company did not make any contributions to the plan.

Segments

The Company has one operating segment. The Company’s chief decision maker, its Chief Executive Officer, manages the Company’s operations on a
consolidated basis for purposes of allocating resources.

Deferred Offering Costs

Offering costs, consisting of legal, accounting, printer, and filing fees related to the IPO were deferred and offset against proceeds from the IPO upon
the effectiveness of the offering. As of December 31, 2018, $2.7 million of deferred offering costs were recorded as other assets in the accompanying
consolidated balance sheets. There were no deferred offering costs for the IPO as of December 31, 2017.

Recent Accounting Pronouncements

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). The new standard requires lessees to apply a dual approach,
classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the
lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the
term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months
regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases. The
Company will make an accounting policy election to account for leases with a term of 12 months or less similar to existing guidance for operating
leases. The Company will adopt the new standard effective January 1, 2019 on a modified retrospective basis and will not restate comparative
periods. Management estimates that the adoption of this standard will result in recognition of approximately $27 – $32 million as a right-of-use asset
for leased facilities and recognition of approximately $44 – $50 million as a corresponding liability for the lease payments remaining on the lease less
tenant improvement incentives on the consolidated balance sheets as of March 31, 2019. Management does not expect a material change to the
consolidated statement of operations and comprehensive loss or cash flows.

3.

Fair Value Measurements

The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy:

Money market funds
U.S. government treasury securities

Total cash equivalents and marketable
   securities

Money market funds

Total cash equivalents and marketable
   securities

Fair
Value
Hierarchy

Level 1
Level 1

December 31, 2018

Amortized
Cost

Unrealized
Gains
(In thousands)

Unrealized
Losses

Fair
Market
Value

  $

65,222    $
224,980     

—    $
3     

—    $
(45)    

65,222 
224,938 

   $

290,202    $

3    $

(45)   $

290,160

Fair
Value
Hierarchy

Amortized
Cost

December 31, 2017

Unrealized
Gains
(In thousands)

Unrealized
Losses

Fair
Market
Value

Level 1

  $

27,201    $

—    $

—    $

27,201 

   $

27,201    $

—    $

—    $

27,201

118

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2018, the remaining maturities of all investments were less than one year.

4.

Balance Sheet Components

Property and Equipment, Net

Property and equipment, net consists of the following:

Lab equipment
Computer equipment
Leasehold improvements
Office equipment
Construction-in-progress

Property and equipment, gross

Less accumulated depreciation and amortization

Total property and equipment, net

Accrued Liabilities

Accrued liabilities consist of the following:

Accrued research and development costs
Accrued employee compensation
Deferred offering costs
Accrued professional services
Accrued property and equipment
Other

Total accrued liabilities

5.

Commitments and Contingencies

Operating Lease

December 31,

2018

2017

(In thousands)
4,599    $
449   
210   
131   
7,449   
12,838   
(1,901)  
10,937    $

3,527 
157 
113 
17 
— 
3,814 
(980)
2,834

December 31,

2018

2017

(In thousands)
3,821    $
2,766   
792   
588   
293   
179   
8,439    $

1,471 
1,294 
— 
387 
201 
102 
3,455

  $

  $

  $

  $

The Company leases its headquarters with its main offices and laboratory facilities in South San Francisco under a sublease agreement that ends in
April 2019. The Company also has laboratory facilities in Milpitas under an agreement that ends in January 2022. In June 2018, the Company signed
a lease agreement to lease approximately 105,000 square feet in new office and laboratory space in South San Francisco that will be the new
headquarters when the current lease ends in April 2019. In connection with the lease, the Company entered into a letter of credit arrangement in the
amount of $1.5 million as collateral for the lease, which is classified as restricted cash on the consolidated balance sheets. The lease is over a ten-year
term with an option to renew for a period of ten years. Rent increases, including the impact of a rent holiday, were recognized as deferred rent, which
is included in other liabilities in the accompanying consolidated balance sheets. Rent expense is recognized on a straight-line basis over the term of
the original lease.

119

 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The following are minimum future rental payments owed under the Company’s operating leases as of December 31, 2018:

2019
2020
2021
2022
2023 and thereafter

Total

(In thousands)

  $

  $

3,231 
6,882 
7,122 
7,146 
50,522 
74,903

Rent expense for the years ended December 31, 2018, 2017, and 2016, was $1.1 million, $1.1 million, and $0.6 million, respectively.

6.

Convertible Preferred Stock

The Company issued 9,373,633 shares of Series E convertible preferred stock in April 2018, July 2018, and October 2018 at an issuance price of
$14.2154 per share. The 24,621 shares issued in October 2018 were to a board member, a related party.

The following tables summarizes the authorized, issued, and outstanding convertible preferred stock of the Company:

Shares
Authorized

Shares
Issued and
Outstanding  

December 31, 2018
Issuance
Net
Price per
Proceeds
Share
(In thousands, except share and per share data)

Aggregate
Liquidation
Preference

Convertible Preferred Stock:
Series A-1
Series A-2
Series B
Series C
Series D
Series E

Total convertible preferred stock

Convertible Preferred Stock:
Series A-1
Series A-2
Series B
Series C
Series D

Total convertible preferred stock

1,000,000     

5,000,000     

1,000,000    $
    10,549,450      10,549,450     
5,000,000     
    12,088,016      12,088,016     
7,363,737     
9,373,633     
    45,849,677      45,374,836     

7,363,737     
9,848,474     

0.40    $
0.91     
1.20     
2.67     
4.01     
14.22     
     $

354    $
9,554     
5,968     
32,158     
29,451     
133,035     
210,520    $

400 
9,600 
6,000 
32,275 
29,529 
133,250 
211,054

Shares
Authorized

Shares
Issued and
Outstanding  

December 31, 2017
Issuance
Net
Price per
Proceeds
Share
(In thousands, except share and per share data)

Aggregate
Liquidation
Preference

5,000,000     

1,000,000     

1,000,000    $
    10,549,450      10,549,450     
5,000,000     
    12,088,016      12,088,016     
7,363,737     
    36,001,203      36,001,203     

7,363,737     

0.40    $
0.91     
1.20     
2.67     
4.01     
     $

354    $
9,554     
5,968     
32,158     
29,451     
77,485    $

400 
9,600 
6,000 
32,275 
29,529 
77,804

The Company recorded its convertible preferred stock at the issuance price on the dates of issuance, net of issuance costs. As of December 31, 2018
and 2017, the Company classifies the convertible preferred stock as temporary equity because the shares are contingently redeemable outside the
control of the Company. Upon

120

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
   
   
 
 
the effectiveness of the IPO, all shares of convertible preferred stock automatically converted on a 1-to-1 basis into shares of common stock.

7.

Stock-based Compensation

The Company recognized stock-based compensation as follows:

Research and development
General and administrative

Total stock-based compensation

Determination of Fair Value

2018

Year Ended December 31,
2017
(In thousands)

2016

  $

  $

4,195    $
2,730   
6,925    $

4,392    $
962   
5,354    $

1,727 
236 
1,963

The estimated grant-date fair value of all the Company’s profit interest units and options to purchase common stock was calculated using the Black-
Scholes option pricing model, based on the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Dividend yield

2018
5.1 – 6.1
73% – 81%
2.5% – 3.1%    

0%

Year Ended December 31,
2017
6.0 – 10.0
75%
1.9 – 2.4%
0%

2016
6.1 – 10.0
77%
1.2 – 2.5%
0%

The fair value of each profit interest unit and stock option was determined by the Company using the methods and assumptions discussed below.
Each of these inputs is subjective and generally requires significant judgment and estimation by management.

Expected Term—The expected term represents the period that stock-based awards are expected to be outstanding. The Company’s profit
interest units did not have a contractual term. However, there is a constructive maturity of the profit interest units based on the expected exit
or liquidity scenarios for the Company. The Company’s historical share option exercise is limited due to a lack of sufficient data points and
did not provide a reasonable basis upon which to estimate an expected term. The expected term was derived by using the simplified method
which uses the midpoint between the average vesting term and the contractual expiration period of the stock-based award.

Expected Volatility—The Company has limited information on the volatility of profit interest units and stock options as the shares were not
actively traded on any public markets prior to February 7, 2019. The expected volatility was derived from the historical stock volatilities of
comparable peer public companies within its industry. These companies are considered to be comparable to the Company’s business over a
period equivalent to the expected term of the stock-based awards.

Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant for zero-coupon
U.S. Treasury notes with maturities approximately equal to the profit interest units’ and stock options’ expected term.

Expected Dividend Rate—The expected dividend is zero as the Company has not paid nor does it anticipate paying any dividends on its
common stock underlying its stock options in the foreseeable future.

Profit Interest Units

The profit interest units have a “strike price” and are economically similar to a stock option with an exercise price. In the event of a distribution by
the Company, the proceeds distributed to the holder would be reduced

121

 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
   
   
 
 
   
   
 
 
   
 
 
   
   
 
 
by the strike price. Profit interest units generally vest 25% after one-year with the remainder vesting quarterly over the following three-year period.

Activity for the profit interest units is shown below:

Unvested as of December 31, 2016

Granted
Vested
Cancelled/forfeited
Exchange of unvested profit interest units for
   restricted common stock upon the Conversion

Unvested as of December 31, 2017

Weighted
Average
Grant
Date Fair
Value per
Unit

1.72 
4.76 
1.89 
1.17 

3.98 
—

Number
of Units
1,205,563   
2,483,500   
(363,387)  
(8,338)  

(3,317,338)  
—   

As discussed in Note 1, on October 12, 2017, the profit interest units were all converted to common stock upon the Conversion.

Restricted Units and Restricted Common Stock

The restricted units have no strike price and generally vest 25% upfront with the remainder vesting quarterly over a four-year period. The restricted
units converted into restricted common stock upon the Conversion in October 2017.

Activity for the restricted units is shown below:

Unvested restricted units as of December 31, 2016

Vested prior to conversion from LLC to
   corporation
Exchange of unvested restricted units for
   restricted common stock upon the Conversion
Unvested restricted units as of December 31, 2017

122

Weighted
Average
Grant
Date Fair
Value per
Unit

0.26 

0.09 

1.33 
—

Number
of Units
1,480,199   

(1,277,275)  

(202,924)  
—   

 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Activity for the restricted common stock is shown below:

Unvested restricted common stock as of
   December 31, 2016

Exchange of unvested profit interest units for
   restricted common stock upon the Conversion
Exchange of unvested restricted units for
   restricted common stock upon the Conversion
Vested
Cancelled/forfeited

Unvested restricted common stock as of
   December 31, 2017

Vested
Cancelled/forfeited

Unvested restricted common stock as of
   December 31, 2018

Weighted
Average
Grant
Date Fair
Value per
Share

— 

6.95 

6.95 
6.95 
6.95 

6.95 
6.95 
6.95 

6.95

Number of
Shares

—    $

3,165,350   

202,924   
(170,227)  
(49,234)  

3,148,813   
(1,219,641)  
(11,324)  

1,917,848   

In the Conversion, the profit interest units and restricted units were cancelled and replaced with replacement awards. The profit interest units were
replaced on a net issuance basis and the restricted units were replaced on a 1-for-1 basis. Unvested units were replaced with restricted common stock
and vested units were replaced with common stock. The grant date fair value of the replacement awards was determined to be the fair value of the
common stock on the date of the Conversion. The Company’s outstanding common stock, as presented, includes shares which are subject to
repurchase.

The fair value of shares vested during the year ended December 31, 2018, 2017, and 2016, was $10.5 million, $9.1 million, and $4.1 million,
respectively. As of December 31, 2018, total unrecognized stock-based compensation related to unvested restricted common stock issued to
employees was $8.5 million, which the Company expects to recognize over a remaining weighted-average period of 2.4 years.

2017 Stock Option and Grant Plan

On October 13, 2017, the Company adopted the 2017 Stock Option and Grant Plan (“2017 Plan”) under which the Board may issue stock options,
restricted stock awards, unrestricted stock awards, and restricted stock units to employees, directors, and consultants. The board of directors has the
authority to determine to whom options or stock will be granted, the number of shares, the term, and the exercise price. If an individual owns stock
representing 10% or more of the outstanding shares, the price of each share shall be at least 110% of the fair market value. Options granted under the
2017 Plan have a term of up to ten years and generally vest over a four-year period with straight-line vesting and a 25% one-year cliff. As of
December 31, 2018, the Company had reserved 8,899,858 shares of common stock for issuance under the 2017 Plan, of which 121,062 shares were
available for issuance.

123

 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Activity for the options to purchase common stock shown below (in thousands, except share and per share amounts):

Outstanding as of December 31, 2016

Granted

Outstanding as of December 31, 2017

Granted
Cancelled/forfeited

Outstanding as of December 31, 2018

Exercisable as of December 31, 2018

Vested and expected to vest as of December 31,
   2018

Weighted
Average
Exercise
Price Per
Share

Weighted
Average
Remaining
Contractual
Term
(In years)

Aggregate
Intrinsic
Value

—     
6.95     
6.95     
8.94     
8.01     
8.94     

8.09     

9.6    $

9.4    $

6,067 

561 

Number of
Options

—    $
22,500     
22,500     
5,063,584     
(22,396)    
5,063,688     

273,561     

5,063,688     

8.94     

9.6    $

6,067

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock options and the fair value of the
Company’s common stock for stock options that were in-the-money. As of December 31, 2018, Alector was still not a public company and the latest
board-approved stock price of $10.14 was used to estimate the intrinsic value. The fair value of shares vested during the year ended December 31,
2018, was $2.5 million. As of December 31, 2018, total unrecognized stock-based compensation related to unvested stock options was $28.9 million,
which the Company expects to recognize over a remaining weighted-average period of 3.6 years.

8.

Income Taxes

The Company was classified as a partnership for U.S. income tax purposes through the Conversion on October 12, 2017. The Company incurred net
losses for the years ended December 31, 2018 and 2017. The Company has not reflected any benefit of such net operating loss carryforwards in the
accompanying financial statements and has established a full valuation allowance against its deferred tax assets due to the uncertainty surrounding
realization of such assets.

A reconciliation of the federal statutory rate to the Company’s effective tax rate is as follows for the years ended December 31, 2018 and 2017:

Tax benefit at federal statutory rate
Pre-conversion passthrough loss
Tax credits
Federal uncertain tax positions
Stock-based compensation
Impact of federal rate change
Nondeductible expense
Change of valuation allowance
Others

Income tax provision

Year Ended December 31,

2018

2017

  $

(10,972)   $

—   
(2,387)  
708   
1,251   
—   
58   
11,346   
(4)  
—    $

  $

124

(11,038)
7,331 
(351)
102 
470 
2,329 
126 
782 
249 
—

 
 
 
 
   
   
   
 
 
 
 
 
   
 
 
   
   
 
 
 
   
      
  
   
      
  
   
      
  
   
      
  
   
      
  
   
   
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The tax effects of temporary differences that give rise to significant components of the Company’s deferred tax assets consist of (in thousands):

Deferred tax assets:

Net operating loss
Accrued bonus
Tax credits
Stock-based compensation
Deferred rent
Others

Gross deferred tax assets

Less valuation allowance

Total deferred tax assets

Deferred tax liabilities:

Depreciation and amortization

Gross deferred tax liabilities
Deferred tax assets, net

December 31,

2018

2017

  $

  $

  $

  $

13,867    $
487   
3,098   
213   
1,647   
98   
19,410   
(17,286)  

2,124    $

(2,124)   $
(2,124)  

—    $

4,363 
230 
574 
— 
— 
73 
5,240 
(5,026)
214 

(214)
(214)
—

In assessing the realization of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred
assets will be realized. The ultimate realization of the deferred tax assets is dependent upon the generation of future taxable income during the periods
in which those temporary differences become deductible. Evaluating the need for a valuation allowance for deferred tax assets often requires
judgment and analysis of all the positive and negative evidence available, including cumulative losses in recent years and projected future taxable
income, to determine whether all or some portion of the deferred tax assets will not be realized. As of December 31, 2018, the Company has utilized
a full valuation allowance to offset the net deferred tax assets as the Company believes it is not more likely than not that the net deferred tax assets
will be fully realizable. The valuation allowance increased on a net basis by $12.3 million during the year ended December 31, 2018.

As of December 31, 2018, the Company had federal and state net operating loss (“NOL”) carryforwards of approximately $17.5 million and
$17.1 million, respectively. Federal and state NOL carryforwards will begin to expire in 2037, if not utilized. Due to tax reform, the Company also
has federal NOL carryforwards of $42.9 million generated after December 31, 2017, which do not expire. As of December 31, 2018, the Company
also had federal and California tax credit carryforward of approximately $3.3 million and $1.1 million, respectively. The federal tax credits will begin
to expire in 2036 while the California tax credits have no expiration date.

Generally, utilization of the NOL carryforwards and credits may be subject to an annual limitation due to the ownership change limitations provided
by Section 382, which provides for limitations on NOL carryforwards and certain built-in losses following ownership changes, and Section 383,
which provides for special limitations on certain excess credits, etc., of the Code, and similar state provisions. Accordingly, the Company’s ability to
utilize NOL carryforwards may be limited as the result of such an “ownership change.” The carryforwards could be subject to an annual limitation,
resulting in a reduction in the gross deferred tax assets before considering the valuation allowance. Further, a portion of the carryforwards may expire
before being applied to reduce future earnings. The Company is not aware of any changes in ownership that would result in material limitations under
Section 382 at this time.

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax
Act”). The Tax Act reduces the federal corporate income tax rate from 35% to 21% effective January 1, 2018, which the Company expects will
positively impact the Company’s future effective tax rate and after-tax earnings in the United States. The Company has recorded a decrease related to
deferred tax assets and deferred tax liabilities, with an offset by the valuation allowance. As a result, the tax provision impact related to the federal tax
rate change is zero. On December 22, 2017, Staff Account Bulletin No. 118 was issued to allow companies to record provisional amounts for those
impacts, with the

125

 
 
 
 
 
 
 
   
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
requirement that the accounting be completed in a period not to exceed one year from the date of enactment. As a result, as of December 31, 2017,
the Company performed a provisional estimate of the effect of the Tax Act in the financial statements. The primary impact of the Tax Act resulted
from the re-measurement of deferred tax assets and liabilities due to the change in the corporate tax rate, reducing our deferred tax assets by $2.3
million with a corresponding reduction in the valuation allowance. This had no effect on the Company’s effective tax rate. In the fourth quarter of
2018, we completed our analysis as of December 31, 2018, with no material changes from our provisional estimate.

The following table summarizes the activity related to the Company’s unrecognized tax benefits for the years ended December 31, 2018 and 2017 (in
thousands):

Balance as of December 31, 2016

Increases related to tax positions taken during the
   prior year
Increases related to tax positions taken during the
   current year

Balance as of December 31, 2017

Increases related to tax positions taken during the
   current year

Balance as of December 31, 2018

  $

  $

— 

227 

403 
630 

877 
1,507

If the unrecognized tax benefits for uncertain tax positions as of December 31, 2018, is recognized, there will be no impact to the effective tax rate as
the tax benefit would increase the deferred tax assets, which is currently offset with a full valuation allowance. The Company’s policy is to include
interest and penalties related to unrecognized tax benefits, if any, within the provision for taxes in the consolidated statements of operations. The
Company did not accrue any interest or penalties and does not have any tax positions for interest or penalties for the year ended December 31, 2018.
The Company does not have any tax positions for which it is reasonably possible that the total amount of gross unrecognized tax benefits will
significantly change within 12 months of December 31, 2018.

The Company’s income tax returns generally remain subject to examination by federal and most state tax authorities. The Company is currently not
subject to any income tax audits by federal or state taxing authorities. The statute of limitations for tax liabilities for all years remains open.

9.

Related Party Transactions

In 2014, the Company entered into a collaboration agreement with Adimab, LLC (“Adimab”), which (as amended, and together with certain
applicable option exercise letters the Company sent to Adimab, the “Adimab Collaboration Agreement”). The Company works with Adimab to
discover and optimize antibodies directed against certain targets selected by the Company. Under the Adimab Collaboration Agreement, the
Company is required to fund, and the Company and Adimab are required to use commercially reasonable efforts to conduct certain research to
discover and optimize antibodies directed against targets selected by the Company. The Company is developing antibodies discovered by Adimab in
its AL001 and AL101 product candidates, and the Company is developing antibodies optimized by Adimab in its AL002 and AL003 product
candidates. The Chief Executive Officer of Adimab is a Co-Founder and Chairperson of the board of directors of Alector. For the years ended
December 31, 2018, 2017, and 2016, Alector incurred expenses of $2.3 million, $0.4 million, and $0.6 million for services provided by Adimab,
respectively. The year ended December 31, 2018, included expenses of $2.3 million related to milestones. The Company will owe up to $3.5 million
in milestone payments per program to Adimab for its product candidates. The Company will also owe low- to mid- single-digit royalty payments for
commercial sales of such product candidates.

126

 
 
 
 
 
 
 
 
 
 
 
 
10.

Net Loss Per Share

The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share for the periods presented
due to their anti-dilutive effect:

Convertible preferred stock
Restricted stock subject to future vesting
Options to purchase common stock
Profit interest units

Total

2018

Year Ended December 31,
2017

45,374,836   
1,917,848   
5,063,688   
—   
52,356,372   

36,001,203   
3,148,813   
22,500   
—   
39,172,516   

2016

36,001,203 
1,480,199 
— 
1,893,201 
39,374,603

11.

Selected Quarterly Financial Data (Unaudited)

The following table provides the selected quarterly financial data for 2018 and 2017. The Company believes that the following information reflects
all normal recurring adjustments necessary for a fair statement of the information for the periods presented.

Revenue
Loss from operations
Net loss
Net loss per share, basic and diluted

Revenue
Loss from operations
Net loss
Net loss per share, basic and diluted

12.

Subsequent Events

December 31,
2018

September 30,
2018

June 30,
2018

March 31,
2018

Three months ended

(in thousands, except per share data)

9,145    $
(19,017)   $
(17,373)   $
(1.48)   $

6,503    $
(16,815)   $
(15,317)   $
(1.34)   $

7,109    $
(12,231)   $
(11,121)   $
(1.00)   $

4,920 
(9,225)
(8,437)
(0.78)

December 31,
2017

September 30,
2017

June 30,
2017

March 31,
2017

Three months ended

(in thousands, except per share data)

3,059    $
(9,807)   $
(9,778)   $
(0.94)   $

153    $
(10,091)   $
(10,033)   $
(1.10)   $

280    $
(7,286)   $
(7,226)   $
(0.83)   $

243 
(5,495)
(5,443)
(0.66)

  $
  $
  $
  $

  $
  $
  $
  $

On February 7, 2019, the Company completed an IPO through issuing and selling 9,739,541 shares of common stock at a public offering price of
$19.00 per share, including 489,541 shares sold pursuant to the underwriters’ partial exercise of their option to purchase additional shares. The
aggregate net proceeds received by the Company from the offering, net of underwriting discounts and commissions and estimated offering expenses,
were $168.2 million. Upon the closing of our IPO, all of the outstanding shares of convertible preferred stock automatically converted into shares of
common stock. Subsequent to the closing of our IPO, there were no shares of convertible preferred stock outstanding.

The Company’s board of directors adopted, and the Company’s stockholders approved, the 2019 Equity Incentive Plan (the “2019 Plan”), effective
February 6, 2019. The 2019 Plan provides for the grant of incentive stock options, nonstatutory stock options, restricted stock, restricted stock units,
stock appreciation rights, performance units, and performance shares to the Company’s employees, directors, and consultants. The Company has
reserved for issuance 7,688,156 shares of common stock pursuant to the 2019 Plan.

The Company’s board of directors adopted, and the Company’s stockholders approved, the 2019 Employee Stock Option Plan (“2019 ESPP”),
effective on February 6, 2019. The 2019 ESPP will enable eligible employees of the Company to purchase shares of common stock at a discount. The
Company has reserved for issuance 1,478,492 shares of common stock pursuant to the 2019 ESPP.

127

 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
 
 
 
 
 
 
 
 
 
   
   
   
 
 
 
 
 
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Conclusions Regarding the Effectiveness of Disclosure Controls and Procedures

As of December 31, 2018, management, with the participation of our Principal Executive Officer and Principal Financial and Accounting Officer,
performed an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-
15(e) of the Exchange Act. Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file or
submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms, and that
such information is accumulated and communicated to our management, including the Principal Executive Officer and the Principal Financial and
Accounting Officer, to allow timely decisions regarding required disclosures. Any controls and procedures, no matter how well designed and operated, can
provide only reasonable assurance of achieving the desired control objective and management necessarily applies its judgment in evaluating the cost-benefit
relationship of possible controls and procedures. Based on this evaluation, our Principal Executive Officer and Principal Financial and Accounting Officer
concluded that, as of December 31, 2018, the design and operation of our disclosure controls and procedures were effective at a reasonable assurance level.

Management’s Report on Internal Control over Financial Reporting

This Annual Report on Form 10-K does not include a report of management’s assessment regarding internal control over financial reporting or an

attestation report of our independent registered public accounting firm due to a transition period established by the rules of the SEC for newly public
companies.

Item 9B. Other Information.

None

128

 
PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Information required by this item will be contained in our definitive proxy statement to be filed with the SEC on Schedule 14A in connection with the

Proxy Statement to be filed within 120 days after December 31, 2018, and is incorporated herein by reference.

Item 11. Executive Compensation.

Information required by this item will be contained in the Proxy Statement to be filed within 120 days of December 31, 2018, and is incorporated

herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information required by this item will be contained in the Proxy Statement to be filed within 120 days of December 31, 2018, and is incorporated

herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Information required by this item will be contained in the Proxy Statement to be filed within 120 days of December 31, 2018, and is incorporated

herein by reference.

Item 14. Principal Accounting Fees and Services.

Information required by this item will be contained in the Proxy Statement to be filed within 120 days of December 31, 2018, and is incorporated

herein by reference.

129

 
 
PART IV

Item 15. Exhibits, Financial Statement Schedules.

(a)

The following documents are filed as part of this report:

(1)

Financial Statements

The consolidated financial statements of Alector, Inc. are filed as part of this report on Form 10-K under Item 8. Financial Statements and
Supplementary Data.  

(2)

Financial Statement Schedules

All other schedules have been omitted because they are not required, not inapplicable, or the required information is included in the
consolidated financial statements or notes thereto.

(3)

Exhibits

The documents listed in the Exhibit Index are incorporated by reference or are filed with this report, in each case as indicated herein
(numbered in accordance with Item 601 of Regulation S-K).

Item 16. Form 10-K Summary

None.

130

 
 
 
 
 
 
 
Exhibit Index

Number

Exhibit Title

Amended and Restated Certificate of Incorporation of the
Registrant.
Amended and Restated Bylaws of the Registrant.
Amended and Restated Registration Rights Agreement among
the Registrant and certain of its stockholders, dated April 26,
2018.

Incorporated by Reference

File No.

Exhibit

Filing

Date

Filed

Herewith

001-38792

001-38792

3.1

3.2

2/11/2019

2/11/2019

Form

8-K

8-K

S-1

333-229152

4.1

1/7/2019

Specimen common stock certificate of the Registrant.

S-1

333-229152

4.2

1/7/2019

Form of Indemnification Agreement between the Registrant
and each of its directors and executive officers.

S-1

333-229152

10.1

1/7/2019

2017 Stock Option and Grant Plan, as amended, and forms of
agreement thereunder.

S-1

333-229152

10.2

1/7/2019

2019 Equity Incentive Plan and forms of agreements
thereunder.

S-1

333-229152

10.3

1/7/2019

2019 Employee Stock Purchase Plan

S-1

333-229152

10.4

1/7/2019

Confirmatory Offer Letter between the Registrant and Arnon
Rosenthal, Ph.D.

S-1/A 333-229152

10.5

1/29/2019

Confirmatory Offer Letter between the Registrant and Robert
Paul, M.D., Ph.D.

S-1/A 333-229152

10.6

1/29/2019

Confirmatory Offer Letter between the Registrant and Robert
King, Ph.D.

S-1/A 333-229152

10.7

1/29/2019

Confirmatory Offer Letter between the Registrant and Sabah
Oney, Ph.D.

S-1/A 333-229152

10.8

1/29/2019

Confirmatory Offer Letter between the Registrant and Calvin
Yu.

S-1/A 333-229152

10.9

1/29/2019

Executive Incentive Compensation Plan.

Outside Director Compensation Policy.

Form of Change in Control and Severance Agreement
between the Registrant and certain of its executive officers.

S-1

S-1

333-229152

10.10

1/7/2019

333-229152

10.11

1/7/2019

S-1

333-229152

10.12

1/7/2019

Sublease between the Registrant and CytomX Therapeutics,
Inc., dated April 25, 2016.

S-1

333-229152

10.13

1/7/2019

Lease between the Registrant and HCP Oyster Point III, LLC,
dated June 27, 2018.

S-1

333-229152

10.14

1/7/2019

Third Amended and Restated Collaboration Agreement
between the Registrant and Adimab, dated September 19,
2016, as amended.

Co-Development and Option Agreement between the
Registrant and AbbVie Biotechnology, Ltd., dated October 16,
2017.

List of subsidiaries of Registrant.

Consent of Independent Registered Public Accounting Firm.

Power of Attorney (included on the signature page to this
Annual Report on Form 10-K).

S-1

333-229152

10.15

1/7/2019

S-1

333-229152

10.16

1/7/2019

X

X

X

3.1

3.2

4.1

4.2

10.1+

10.2+

10.3+

10.4+

10.5+

10.6+

10.7+

10.8+

10.9+

10.10+

10.11+

10.12+

10.13

10.14

10.15#

10.16#

21.1

23.1

24.1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
131

31.1

31.2

32.1*

32.2*

Certification of Principal Executive Officer Pursuant to Rules
13a-14(a) and 15d-14(a) under the Securities Exchange Act of
1934, as Adopted Pursuant to Section 302 of the Sarbanes-
Oxley Act of 2002.

Certification of Principal Financial Officer Pursuant to Rules
13a-14(a) and 15d-14(a) under the Securities Exchange Act of
1934, as Adopted Pursuant to Section 302 of the Sarbanes-
Oxley Act of 2002.

Certification of Principal Executive Officer Pursuant to 18
U.S.C. Section 1350, as Adopted Pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002.

Certification of Principal Financial Officer Pursuant to 18
U.S.C. Section 1350, as Adopted Pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002.

X

X

X

X

+

#

*

Indicated management contract or compensatory plan.

Portions of this exhibit (indicated by asterisks) have been omitted pursuant to a request for confidential treatment and this exhibit has been filed
separately with the SEC.

The certifications attached as Exhibits 32.1 and 32.2 that accompany this Annual Report on Form 10-K are not deemed filed with the Securities and
Exchange Commission and are not to be incorporated by reference into any filing of the Registrant under the Securities Act of 1933, as amended, or
the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Annual Report on Form 10-K, irrespective of any
general incorporation language contained in such filing.

132

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Report to

be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 26, 2019

ALECTOR, INC.

By: /s/ Arnon Rosenthal

Arnon Rosenthal, Ph.D.
Co-Founder and Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Arnon Rosenthal, Ph.D.,

Sabah Oney, Ph.D., and Calvin Yu as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and substitution, for him or her
and in his or her name, place, and stead, in any and all capacities (including his capacity as a director and/or officer of Alector, Inc. ) to sign any or all
amendments (including post-effective amendments) to this registration statement and any and all additional registration statements pursuant to Rule 462(b) of
the Securities Act of 1933, as amended, and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as they, he or she might or could do in person, hereby
ratifying and confirming all that said attorney-in-fact and agents or any of them, or their, his, or her substitute or substitutes, may lawfully do or cause to be
done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Report has been signed below by the following persons on

behalf of the Registrant in the capacities and on the dates indicated.

Signature 

/s/ Arnon Rosenthal

Arnon Rosenthal, Ph.D.

/s/ Calvin Yu

Calvin Yu

/s/ Tillman Gerngross

Tillman Gerngross, Ph.D.

/s/ Carl Gordon

Carl Gordon, Ph.D., CFA

/s/ Louis J. Lavigne, Jr.

Louis J. Lavigne, Jr.

/s/ Terry McGuire

Terry McGuire

Title 

Co-Founder, Chief Executive Officer, and
Director
(Principal Executive Officer)

Date 

March 26, 2019

Vice President, Finance
(Principal Financial and Accounting Officer)

March 26, 2019

Chairperson of the Board

March 26, 2019

Director

Director

Director

March 26, 2019

March 26, 2019

March 26, 2019

133

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Signature 

Title 

/s/ Richard Scheller

Richard Scheller, Ph.D.

/s/ David Wehner

David Wehner

Director

Director

Date 

March 26, 2019

March 26, 2019

134

 
 
 
 
 
 
 
 
 
 
Alector LLC

SUBSIDIARIES OF REGISTRANT

Exhibit 21.1

 
Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-229548) pertaining to the 2019 Equity Incentive
Plan, the 2019 Employee Stock Purchase Plan, and the 2017 Stock Option and Grant Plan of Alector, Inc. of our report dated March 26, 2019,
with respect to the consolidated financial statements of Alector, Inc. included in this Annual Report (Form 10-K) for the year ended December
31, 2018.

Exhibit 23.1

/s/ Ernst & Young LLP

San Jose, California
March 26, 2019

 
 
Exhibit 31.1

I, Arnon Rosenthal, certify that:

CERTIFICATION PURSUANT TO SECTION 302
OF THE SARBANES-OXLEY ACT OF 2002

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Alector, Inc;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)

(b)

(c)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent
fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control
over financial reporting.

Date: March 26, 2019

/s/ Arnon Rosenthal
Arnon Rosenthal, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 31.2

I, Calvin Yu, certify that:

CERTIFICATION PURSUANT TO SECTION 302
OF THE SARBANES-OXLEY ACT OF 2002

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Alector, Inc;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)

(b)

(c)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent
fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control
over financial reporting.

Date: March 26, 2019

/s/ Calvin Yu
Calvin Yu
Vice President, Finance
(Principal Finance and Accounting Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the Annual Report on Form 10-K of Alector, Inc. (the “Company”) for the period ending December 31, 2018, as filed with the
Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officer of the Company certifies, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 26, 2019

/s/ Arnon Rosenthal
Arnon Rosenthal, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.2

In connection with the Annual Report on Form 10-K of Alector, Inc. (the “Company”) for the period ending December 31, 2018, as filed
with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officer of the Company certifies, pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 26, 2019

/s/ Calvin Yu
Calvin Yu
Vice President, Finance
(Principal Finance and Accounting Officer)