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Nektar Therapeutics

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FY2006 Annual Report · Nektar Therapeutics
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Nektar Therapeutics
201 Industrial Road
San Carlos, California 94070
USA
+1 650 631-3100 Global Headquarters
+1 650 631-3150 Main FAX
www.nektar.com
NASDAQ: NKTR

2006 ANNUAL REPORT

Nektar Therapeutics is a leader in translating 
advanced PEGylation and pulmonary delivery 
technologies into therapies that transform patient 
care and outcomes. We are the science and 
development expertise behind blockbuster 
products that make a positive difference in the 
lives of patients. We are a public company with a 
deep commitment to creating value for our 
shareholders and making them proud of the 
scientific and medical advances that their support 
enables.

To meet our commitments to patients, physicians 
and shareholders, we are moving our company in a 
new direction. Starting from a position of strength 
made possible by our previous achievements, we 
are moving toward greater efficiency, productivity 
and value creation by reorganizing into specific 
business units and focusing on advancing our 
proprietary pipeline. Never before have we believed 
so strongly in our ability to succeed. Come see 
what the excitement at Nektar is all about.

Table of Contents

	 1 

	 2 

	 4 

	 6 

	 8 

	 9 

	10 

	11 

	23 

 Platforms, People, Products

 Letter to the Shareholders

 PEGylation Technology

 Pulmonary Technology

 Partnered & Proprietary Products

 2006 Financial Review

 Selected Financial Information

 Management’s Discussion and Analysis  
of Financial Condition and Results of Operations

 Report of Independent Registered  
Public Accounting Firm

	25 

26	 

27	 

28	 

30	 

 Management’s Report on Internal Control  
Over Financial Reporting

 Nektar Therapeutics Consolidated Balance Sheets

 Nektar Therapeutics Consolidated Statements  
Of Operations

 Nektar Therapeutics Consolidated  
Statements Of Stockholders’ Equity

 Nektar Therapeutics Consolidated  
Statements Of Cash Flows

31	  Notes To Consolidated Financial Statements

52	  Nektar Corporate Information

53	  Nektar Management Team & Board of Directors

Nektar Management Team

Howard W. Robin
President and  
Chief Executive Officer,  
Director

Louis Drapeau
Senior Vice President,  
Finance and 
Chief Financial Officer

Nevan Elam
Senior Vice President, 
Head of the Pulmonary  
Business Unit

Elizabeth Frisby
Vice President,  
Human Resources

Hoyoung Huh, M.D., Ph.D.
Senior Vice President,  
Business Development 
and Marketing

David Johnston, Ph.D.
Senior Vice President,  
Research and Development

Gil Labrucherie
Senior Vice President,  
General Counsel and Secretary 

Truc Le
Senior Vice President,  
Operations and Corporate Quality

John S. Patton, Ph.D.
Chief Scientific Officer, 
Director and Founder

Christopher J. Searcy, Pharm.D.
Senior Vice President,  
Corporate Development 

David Tolley
Senior Vice President,  
Operations and Site Manager, 
Nektar Alabama

Tim Warner
Senior Vice President,  
Investor Relations  
and Corporate Affairs

Nektar Board of Directors

Susan Wang
Former Executive  
Vice President,  
Corporate Development  
and Chief Financial Officer 
Solectron

Roy A. Whitfield
Former Chairman and  
Chief Executive Officer 
Incyte

Robert B. Chess
Chairman of the Board 
Nektar Therapeutics

Michael A. Brown
Chairman, Line 6 
Director, Former Chairman  
and Chief Executive Officer 
Quantum Corp

Joseph J. Krivulka
Founder and President 
Triax Pharmaceuticals

Christopher A. Kuebler
Former Chairman and  
Chief Executive Officer 
Covance

Irwin Lerner
Former Chairman and  
Chief Executive Officer 
F. Hoffmann-LaRoche

John S. Patton, Ph.D.
Co-Founder and  
Chief Scientific Officer 
Nektar Therapeutics

Howard W. Robin
President and  
Chief Executive Officer 
Nektar Therapeutics

The preceding discussion contains forward-looking statements that involve risks and uncertainties. Nektar’s actual results could differ 
materially from those discussed here. Factors that could cause or contribute to such differences include, but are not limited to, those 
discussed in Part 1 of the Form 10-K filed with the Securities Exchange Commission for the fiscal year ended December 31, 2006 under 
the heading “Risk Factors.”

All Nektar brand and product names are trademarks or registered trademarks of Nektar Therapeutics in the United States and other 
countries. The following, which appear in this Annual Report, are registered or other trademarks owned by the following companies:  
Exubera (Pfizer Inc.); PEGASYS (Hoffmann-La Roche, Ltd.); Neulasta (Amgen Inc.); Cimzia (UCB Group); Definity (Bristol-Myers Squibb 
Medical Imaging, Inc.); Somavert (Pfizer Inc.); PEG-INTRON (Schering-Plough Corporation); SprayGel (Confluent Surgical Inc.); Macugen 
(OSI Pharmaceuticals, Inc.); MARINOL (Solvay Pharmaceuticals, Inc.).

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D

 
 
 
 
 
| PLATFORMS, PEOPLE, PRODUCTS

WE MAKE MEDICINES better for patients

Nektar’s  
Platform Technologies

ADVANCED PEGYLATION When attached to a drug, polyethylene glycol (PEG) polymer chains can sustain 
bioavailability by protecting the drug molecules from immune responses and other clearance mechanisms.  
In the body, the chain-like PEG attracts water molecules that act like a shield, protecting the active drug molecule 
from degradation by antibodies or enzymes.  The water molecules also significantly increase the PEG’s 
original size, thereby slowing the drug clearance from the kidneys, which allows the drug to stay in the body 
longer.  The end result: medicine with prolonged and enhanced therapeutic benefits.  Most importantly, Nektar 
scientists are demonstrating through the use of various structures that “PEGylation” technology can be applied to 
small molecules.

ADVANCED PULMONARY DELIVERY Pulmonary delivery offers opportunities for improved and innovative 
drug delivery and greater patient compliance.  In addition, pulmonary delivery offers rapid onset of action and 
more efficient and targeted treatment of lung disorders.  Nektar Advanced Pulmonary Delivery combines 
innovations in dry powder and liquid pulmonary technology with state-of-the-art devices that deliver both large 
and small molecules to the lung for systemic and local drug administration.

11 Marketed or Filed ProdUCtS

PRODUCT

PARTNER

STATUS

Exubera®
for diabetes

Neulasta®
for neutropenia

Pfizer

Marketed

Amgen

Marketed

Macugen® 
for macular degeneration

OSI  
Pharmaceuticals

Marketed

Somavert®
for acromegaly

PEGASYS®
for hepatitis C  

PEG-INTRON® 
for hepatitis C  

Definity®
for cardiac imaging

SprayGel™
for post-surgical adhesions

DuraSeal™
for cranial dural sealant

Cimzia™
for Crohn’s disease

Mircera™
for renal anemia

Pfizer

Marketed

Roche

Marketed

Schering

Marketed

Bristol-Myers 
Squibb

Marketed

Confluent

Marketed

Confluent

Marketed

UCB Pharma

Filed

Roche

Filed

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01

 
 
 
 
 
 
 
 
| LETTER

ANTICIPATED 2007 VALUE DRIVERS

Proprietary Programs

revenue and Product approvals

• NKTR-061 (inhaled amikacin) Phase 2a data by year-end 

• Revenue from full launch of Exubera 

• NKTR-102 (PEG-irinotecan) Commence Phase 2 by year-end

• Roche’s Mircera approval in US (renal anemia) 

• NKTR-118 (oral PEG-naloxol) Commence Phase 2 by year-end

• UCB’s Cimzia™ approval in US and EU (Crohn’s disease) 

Partnering

Focus the Business

• One pulmonary and one PEG product deal with significant 
  economics

• Improve productivity and efficiency

• Significantly reduce cash burn

The anticipated value drivers and certain other statements in this letter are forward-looking statements and actual results could differ materially based on a 
number of risks and uncertainties including those contained under the heading “Risk Factors” in Nektar’s most recent annual report on Form 10-K and 
quarterly report on Form 10-Q filed with the SEC.

02

 
TO OUR SHAREHOLDERS

Nektar Therapeutics is widely regarded in the biopharmaceutical  
industry as a technology and commercial pioneer in the 
pulmonary delivery and PEGylation of medicines. We have 
leveraged this expertise to transform approved products— 
many of which serve large and lucrative commercial markets—
into significantly safer, more effective, and more convenient 
therapeutics for patients. The most recent example of our 
pioneering efforts to improve therapeutics is Exubera®, which 
has been approved in the U.S. and Europe, the world’s two 
most important pharmaceutical markets.

One of the programs we are accelerating is NKTR-102 (PEG-
irinotecan). Irinotecan is a top-selling chemotherapy for colon 
cancer and other solid tumors which is a tremendously 
important product for oncologists. However, irinotecan has 
severe limitations: the drug causes diarrhea and neutropenia. 
These are dose-limiting side effects that can seriously 
complicate treatment. Our preclinical data indicate that 
PEGylation of irinotecan has the potential to significantly 
mediate these two side effects and, therefore, greatly improve 
the quality of care for cancer patients taking this drug. 

Exubera matters
Exubera is the world’s first inhaled insulin product to be 
approved for the treatment of adults with type 1 and type 2 
diabetes. This drug has the potential to revolutionize the way 
diabetes—one of this generation’s greatest health problems— 
is treated. The sales and marketing of Exubera, which under 
our collaboration agreement is the responsibility of Pfizer, has 
been the focus of great concern to investors and analysts.  

We believe that Exubera’s regrettably slow start is a poor 
indication of its true potential in a multibillion-dollar market  
that has gone underserved for more than a generation. We  
are, therefore, working closely with the new management team 
at Pfizer, and the new Exubera marketing team, in particular,  
to ensure that this breakthrough product reaches its potential. 
Pfizer is equally committed to Exubera’s success and it is 
putting in place a sales and marketing program that is 
designed to succeed where the previous program  
came up short.

Advancing our proprietary pipeline
Make no mistake, Exubera prescriptions matter. However, there 
are a number of proprietary products in development at Nektar 
with enormous therapeutic and commercial potential that have 
unfortunately been overlooked and overshadowed in recent 
years by Exubera and our other pulmonary-based programs. 

When the market and medical community gain more clarity 
about our proprietary pipeline, particularly our PEGylated small 
molecule programs, they will understand why we are so excited 
about these prospects. 

The vast majority of medicines on the market today are small 
molecules. PEGylating these molecules is far from simple, but 
we are the PEGylation experts. All of the PEGylated 
therapeutics approved over the past 10 years have been 
enabled by Nektar.  We are producing data and filing patents to 
prove that with the right chemistry, the hurdles to PEGylating 
small molecules are not insurmountable.

We are also accelerating the development of NKTR-118 (oral 
PEG-naloxol) for opioid-induced constipation. In preclinical 
studies, NKTR-118 alleviated constipation without diminishing 
the analgesic impact of the opioid; it did not enter the central 
nervous system as a result of our proprietary PEGylation 
chemistry. 

In addition to NKTR-102 and NKTR-118, Nektar is developing 
a number of other proprietary programs including PEG-Factor 
IX for hemophilia, NKTR-203 (basal insulin for diabetes), 
NKTR-024 (inhaled amphotericin B) for the prevention of 
invasive pulmonary fungal infections and NKTR-061 (inhaled 
amikacin) for pneumonia.

What it takes
Elevating the importance of our proprietary pipeline is just one 
of many sweeping changes underway at Nektar to better 
leverage our pulmonary and PEGylated drug development 
platforms. We will continue to partner our products when the 
economics add significantly to shareholder value, however, in 
general we will focus more upon proprietary drug development. 

Nektar has two remarkable platform technologies which can be 
broadly applied to make medicines more therapeutically and 
commercially valuable, and to develop novel therapeutics. We 
have only begun to prove what we are capable of producing for 
shareholders and patients alike.

Sincerely,

Howard W. Robin 
President and Chief Executive Officer

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03

 
 
 
 
 
 
 
 
| PEGYLATION TECHNOLOGY

OPPORTUNITIES THROUGH INNOVATION

All of the PEGylated medicines approved over the past 10 years were enabled by Nektar. Our 
scientific ingenuity is the engine behind our expanding portfolio of robust PEGylated product 
opportunities.

04

Our PEGylation technologies improve the performance and 
tolerability of drugs used to treat chronic ailments and 
 life-threatening illnesses.

Nektar’s PEGylation franchise is based on complex technology, 
but its impact on therapeutics–and its value to the 
biopharmaceutical industry–are quite simple to grasp. All of the 
PEGylated therapeutics approved over the past 10 years were 
enabled by Nektar. Many of these therapeutics have become 
mainstays in cancer care, infectious diseases and other serious 
medical conditions.

approaches and structures that allow us to attach a PEG to a 
small molecule. This novel approach improves the therapeutic 
profile of the small molecule and avoids blood-brain-barrier and 
first-pass metabolism effects. The end result is a small 
molecule that stays in the body longer, prolonging the drug’s 
therapeutic effects, and can avoid central nervous system 
uptake.

A Robust Technology
The process of PEGylation adds polymers of polyethylene 
glycol (PEG) to a drug. Binding of water molecules to the 
chain-like PEG molecules leads to the effective expansion  
and motion of the polymer, which reduces the interaction 
between the PEGylated drug and other molecules within the 
body. By reducing interactions between the drug and the 
immune system and clearance mechanisms, the addition of 
PEG can reduce a drug’s immunogenicity and may substantially 
improve a drug’s half-life. Compared to unmodified drugs, 
PEGylated molecules often result in improved clinical benefits 
such as: efficacy, safety and less frequent administration.

In the past, Nektar’s R&D efforts have been focused on 
PEGylating large molecules for partners. With an eye on the 
future, and far larger market opportunities, we are pioneering 
efforts to PEGylate small molecules. Small molecule medicines 
represent the vast majority of prescription drugs on the market 
and in development today. Traditional PEGylation technology is 
not conducive to small molecules, so we invented new 

Nektar’s Most Advanced 
Proprietary PEGylation Programs

NKTR-102 (PEG-irinotecan) is a PEGylated formulation of 
irinotecan, a drug with demonstrated efficacy in the treatment 
of colorectal cancer and other solid tumors. Irinotecan is a 
remarkable drug, but it causes neutropenia and severe 
diarrhea, which exacerbates the misery experienced by cancer 
patients undergoing irinotecan chemotherapy. Preclinical 
studies suggest that NKTR-102 may significantly reduce the 
neutropenia and severe diarrhea associated with irinotecan. 

NKTR-118 (oral PEG-naloxol) is an oral PEGylated formulation  
of an analog of naloxone. This drug is designed to relieve the 
constipation that chronic and acute pain sufferers experience 
when taking opioids for pain relief. Phase 1 data suggest that 
NKTR-118 has the potential to significantly improve the quality 
of life for these patients by alleviating their constipation. NKTR-
118 does not enter the central nervous system where it could 
interfere with the opioid analgesia. 

Preclinical data suggest that NKTR-102 (PEG-irinotecan) 
can potentially produce dramatically better results than irinotecan

Total episodes in 8 dogs given 4 weekly doses,
25mg/kg equivalent irinotecan doses

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Dosing

Control

Irinotecan

NKTR-102

Diarrhea
episodes

n = 10 per treatment group
Dose = 90mg/kg

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Observation Days

Early diarrhea 

 Late diarrhea

Less than 24 hours after dosing

More than 24 hours after dosing

Irinotecan
NKTR-102

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05

 
 
 
 
 
 
 
 
  
| PULMONARY DELIVERY TECHNOLOGY

APPLYING PROVEN SCIENCE

Nektar’s advanced pulmonary delivery technologies are improving the lives of patients with  
diabetes, infectious diseases and other life-threatening conditions by improving the therapeutic 
performance of their medicines.

A Breakthrough  
In Treatment 

Nektar developed and licensed to Pfizer the world’s first inhaled insulin 
product—and this breakthrough product is bringing new hope for diabetics.  
as Pfizer notes, “the fear of injections has prevented or delayed far, far 
too many patients from accepting this appropriate treatment to control 
their blood sugar levels. exubera® (insulin human [rdNa origin]) inhalation 
Powder is a major advance in insulin delivery to help patients accept 
insulin early for better glycemic control … ‘taking exubera is a welcome 
alternative. the device is small enough to fit into my coat pocket, and  
i can carry it with me everywhere i go. Using exubera helps me to control 
my diabetes,’ said a 62-year-old exubera user with type 2 diabetes. … 
Pfizer is moving forward to effectively establish exubera and serve the 
million of diabetics still uncontrolled on current therapy.”

01

06

Nektar is turning the challenges of pulmonary 
delivery into opportunities for success in the 
clinic and in the marketplace.

For patients with lung disorders, pulmonary delivery offers 
rapid, efficient and targeted treatment of disease that is 
superior to what can be achieved with oral or systemic 
administration. We are building a diverse pipeline of inhaled 
anti-infective agents to treat a variety of life-threatening  
pulmonary infections.

Transforming Disease 
Management
Our pulmonary delivery technology is transforming the 
treatment of diseases that are managed today with injected 
therapies. Exubera,® approved for the treatment of type 1 and 
type 2 diabetes, is the first example of this approach in action. 
Exubera is an effective new approach to managing diabetes, 
one of the biggest problems in public health today.

Nektar’s Most Advanced 
Pulmonary Delivery Program
NKTR-061 (inhaled amikacin). Patients with hospital-acquired 
pneumonia who need mechanical ventilation, as well as 
patients on ventilators who contract ventilator-associated 
pneumonia have high morbidity and mortality rates, in spite of 
available broad spectrum intravenous antibiotics.

It is estimated that 3.5 million patients in U.S. hospitals are 
diagnosed with pneumonia each year. Of these cases, up to 
250,000 are on mechanical ventilators.

Our Inhaled antibiotics program is designed to treat 
pneumonias in this ventilated patient population. Our easy-to-
use micropump technology ensures that NKTR-061 (inhaled 
amikacin) has the potential to deliver a target lung 
concentration sufficient to treat resistant bacteria without 
producing the systemic toxicity commonly found with high 
doses of intravenous antibiotics. 

NKTR-061 (inhaled amikacin) has the potential to 
effectively target the lung without systemic toxicity

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3500

3000

2500

2000

1500

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275

250

225

200

175

150

125

100

75

50

25

Target lung concentration to
treat resistant bacteria

Blood

Lung

Toxic blood level of amikacin

IV Amikacin, 
Dose = 500mg BID

NKTR-061, 
Dose = 400mg BID

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07

 
 
 
 
 
 
 
 
| PARTNERED & PROPRIETARY PRODUCTS

A PIPELINE WITH BLOCKBUSTER POTENTIAL

Nektar is committed to developing a portfolio of products that will improve patient care and 
create value for our investors.

11 ProdUCt CaNdidateS iN the CliNiC

PRODUCT

PARTNER

STATUS

Tobramycin Inhalation 
Powder (TIP™)  
for lung infection

PEG-Anti-GFR 
antibody fragment  
for cancer (CDP 791)

Inhaled-Dronabinol  
for migraine

PEG-human growth 
hormone for growth 
deficiency (hGH)

PEG-Hematide™  
for anemia

Ciprofloxacin Inhalation 
Powder (CIP)  
for lung infection

Ostabolin-C™ Inhalation  
Powder (OCIP)  
for osteoporosis

Novartis

Phase 3

UCB Pharma

Phase 2

Solvay

Phase 2

Pfizer

Phase 2

Affymax

Phase 2

Bayer

Phase 1

Zelos 
Therapeutics

Phase 1

NKTR-061 (inhaled amikacin)
for pneumonia

Phase 2

NKTR-024 (inhaled amphotericin B) for 
prevention of invasive pulmonary fungal infections

Phase 1

NKTR-102 (PEG-irinotecan) 
for solid tumors

NKTR-118 (oral PEG-naloxol)
for opioid-induced constipation

Phase 1

Phase 1

08

4 PRECLINICAL DEVELOPMENT PROGRAMS

PRODUCT

PARTNER

STATUS

Baxter

Pfizer

PEG-Factor VIII 
for hemophilia

EG-Factor IX 

P
for hemophilia

Next Generation 
Inhaled Insulin 
for diabetes

NKTR-203
Basal Insulin for diabetes

Pre-
clinical

Pre-
clinical

Pre-
clinical

Pre-
clinical

Nektar proprietary products

2006 Financial Review

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Selected Financial information

The selected consolidated financial data set forth below should be read together with the consolidated financial statements and  
related notes, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and the other information 
contained herein. 

(In thousands, except per share information) 
Years ended December 31, 

StatementS of operationS Data: 
Revenue: 
  Product sales and royalties 1 
  Contract research 
  Exubera commercialization readiness 

Total revenue 
Total operating costs and expenses 2 

Loss from operations 2 
Gain (loss) on debt extinguishment 
Interest and other income (expense), net 
(Provision) Benefit for income taxes 

Net loss 

Basic and diluted net loss per share 3 
Shares used in computing basic and  
  diluted net loss per share 3 

2006 

2005  

2004 

2003 

2002 

$ 

$ 

$ 

153,556 
56,303 
7,859 

217,718 
376,948 

(159,230) 
—   

5,297 
(828) 

$ 

2,366 
81,602 
15,311 

$  25,085 
8,185 

$ 

27,25 
78,62 

—   

—   

$  18,465
76,380 
—

126,27 
308,12 

114,270 
  188,212 

106,257 
171,012 

4,845 
  13,658

(182,633) 
(303) 
(2,312) 
137 

(73,42) 
(,258) 
(18,84) 
163 

(64,755) 
12,018 
(12,84) 
(16) 

(8,813)
—
(8,655)
—

(154,761)  $  (185,111)  $  (101,886)  $ 

(65,80)  $  (107,468)

(1.72)  $ 

(2.15)  $ 

(1.30)  $ 

(1.18)  $ 

(1.4)

89,789 

85,15 

78,461 

55,821 

55,282 

Years ended December 31, 

2006 

2005 

2004 

2003  

2002 

Balance Sheet Data: 
Cash, cash equivalents and investments 
Working capital 
Total assets 
Convertible subordinated notes 4 
Other long term liabilities 
Accumulated deficit 
Total stockholders’ equity 

466,977 
369,725 
768,177 
417,653 
29,457 

$ 
$  23,6 
$  418,740 
$ 
$  136,424 
$  223,880 
$ 
$  606,638
$  744,21 
$ 
$  2,14 
$  173,4 
$ 
37,553 
$ 
$  36,250 
$  (1,056,993)  $  (02,232)  $  (717,121)  $  (615,235)  $  (54,345)
$ 
$  206,770
$  467,342 

$  566,423 
$  450,248 
$  858,554 
$  417,653 
27,58 
$ 

$  28,40 
$  223,71 
$  616,788 
$  35,88 
46,742 
$ 

$  326,811 

$  164,11 

227,060 

1  2006 Product sales and royalties include commercial manufacturing revenue from Exubera Inhalation Powder and Exubera Inhalers. 

2   We changed our method of accounting for stock based compensation on January 1, 2006 in connection with the adoption of SFAS No. 123R,  

Accounting for Share-Based Payment. 

3  Basic and diluted net loss per share is based upon the weighted average number of common shares outstanding. 

4  We repaid $36.0 million of the 5% Convertible Subordinated Notes on February 7, 2007.

10

 
 
 
 
  
  
  
  
    
    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations

The following discussion contains forward-looking statements  
that involve risks and uncertainties. Our actual results could differ 
materially from those discussed here. Factors that could cause or 
contribute to such differences include, but are not limited to, those 
discussed in this section as well as in Item 1A of Part I of the  
Annual Report on Form 10-K filed with the Securities and Exchange 
Commission under the heading “Risk Factors.”

Overview 
We are a biopharmaceutical company with a mission to develop 
breakthrough products that make a difference in patients’ lives.  
We create differentiated, innovative products by applying our 
platform technologies to established or novel medicines. Our two 
leading technology platforms are Pulmonary Technology and 
PEGylation Technology. Nine products using these technology 
platforms have received regulatory approval in the U.S. or the  
EU. Our two technology platforms are the basis of nearly all of  
the partnered and proprietary programs currently in pre clinical  
and clinical development or being commercialized. 

We create or enable potential products in two ways. First, we 
develop products in collaboration with pharmaceutical and 
biotechnology companies that seek to improve and differentiate 
their products. Second, we apply our technologies to already 
approved drugs to create and develop our own differentiated, 
proprietary programs. Our proprietary programs are designed to 
target serious diseases in novel ways. We believe our proprietary 
products and development programs have the potential to raise  
the standards of current patient care by improving one or more 
performance parameters including efficacy, safety and ease-of-use. 

Our technology platforms enable improved performance of a variety 
of new and existing molecules. Our Pulmonary Technology makes 
drugs inhaleable to deliver them to and through the lungs for both 
systemic and local lung applications. Our PEGylation Technology  
is a chemical process designed to enhance the performance of 
most drug classes with the potential to improve solubility and 
stability, increase drug half-life, reduce immune responses to an 
active drug, and improve the efficacy or safety of a molecule in 
certain instances. 

The commercial success of Exubera will be a critical factor in  
us achieving our profitability objective and for us to be able to  
fund the key elements of our business strategy. We expect our 
future revenues to come increasingly from the manufacture and 
sale of Exubera Inhalation Powder and Inhalers and royalties  
from sales of Exubera by Pfizer. Like any product in the early  
stages of commercial launch, there are substantial risks and 
uncertainties with respect to the commercial success of  
Exubera, including the timing and success of the commercialization 
of Exubera by Pfizer in various markets, physician and patient 
education and experiences, third party payor reimbursement, 
country specific pricing approvals, manufacturing and supply 
execution, and other risks and uncertainties identified in this  
report. In addition, under our collaboration agreement with  
Pfizer, we do not participate in the marketing and sales  
activity for Exubera. 

Our manufacturing revenues received from Pfizer for Exubera 
Inhalation Powder and Inhalers are calculated on a cost-plus basis. 
Exubera royalty revenue levels will depend on the level of Exubera 
product sales to end users and Pfizer’s cost of goods sold for 

Exubera. Pfizer is taking a phased approach to the Exubera 
commercial launch. In the second half of 2006, the early phase  
of the Exubera launch focused on manufacturing scale-up activities 
and the education of diabetes specialists. In 2007, Pfizer initiated 
the next phase of the launch expanding the education, marketing 
and sales efforts more broadly to primary care physicians. Because 
the Exubera commercial roll-out is in its early phases, we cannot 
predict the level of Exubera end user product sales or expected 
royalty revenues for this or subsequent years. 

Currently, we are the exclusive manufacturer of the Exubera 
Inhalation Powder. Under our collaboration agreement, Pfizer  
can manufacture up to one-half of the Exubera Inhalation Powder 
and also has responsibility for the automated filling of all insulin 
blister packs for the Exubera Inhaler and packaging of the Exubera 
product. Pfizer has an Exubera Inhalation Powder manufacturing 
facility and will likely manufacture a portion of the Exubera 
Inhalation Powder in the future. In the second half of 2006, Pfizer 
experienced scale-up challenges with highly automated, specially 
engineered Pfizer equipment, although Pfizer has said they made 
significant progress in addressing these challenges. Any failure, 
delay or inability to address these challenges and scale-up Pfizer’s 
portion of the manufacturing, filling, and packaging processes  
could impede Exubera sales and would significantly and adversely 
impact our revenues, results of operations, and financial condition. 
Although we have been successful at meeting our Exubera 
Inhalation Powder and Inhaler manufacturing objectives to  
date, it is critical that we continue to meet our manufacturing 
commitments in 2007 to support Pfizer’s requirements.  
Commercial scale manufacturing execution by both Nektar  
and Pfizer remains an important factor in meeting anticipated 
Exubera market demand and meeting our financial objectives. 

We continue to make significant investments in our proprietary 
development programs which comprise a substantial portion of  
our research and development spending. Our current strategy is  
to develop a portfolio of proprietary programs that is intended to 
address critical unmet medical needs by exploiting our know-how 
and technology in combination with established medicines. We 
intend to continue our strategy of partnering these development 
programs with pharmaceutical and biotechnology companies in 
various stages of their development in an effort to help fund the 
investment of our proprietary development programs. Our decision 
as to when to seek partners for our proprietary development 
programs will be made on an individual program basis and such 
decisions will have an important impact on our future revenues, 
research and development spending, and financial position. In this 
regard, we are currently seeking collaboration partners for two of 
our proprietary development programs and the success and timing 
of these partnering efforts will affect our research and development 
expense levels and revenues in 2007 and beyond. 

We will continue to seek collaborative arrangements with 
pharmaceutical and biotechnology companies. We believe our 
partnering strategy enables us to develop a large and diversified 
pipeline of products and development programs using our 
technologies. To date the revenues we have received from the sales 
of our partner products have been insufficient to meet our operating 
and other expenses. Other than revenues we expect to generate 
from Exubera, we do not anticipate receiving sufficient amounts of 
revenue from other partner product sales or royalties in the near 
future to meet our operating expenses. 

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11
11

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

To fund the expense related to our research and development 
activities, we have raised significant amounts of capital through  
the sale of our equity and convertible debt securities. As of 
December 31, 2006, we had approximately $447. million in  
long-term debt. Our ability to meet the repayment obligations of  
this debt is dependent upon our and our partners’ ability to develop, 
obtain regulatory approvals, and successfully commercialize 
products. Even if we are successful in this regard, we may  
require additional capital to repay our debt obligations. 

research and develOpment activities 
Our product pipeline includes both partnered and proprietary 
development programs. We have ongoing collaborations or  
licensing arrangements with more than 30 biotechnology  
and pharmaceutical companies to provide our technologies.  
Our technologies are currently being used in nine approved 
products, in two partner programs that have been filed for with  
the FDA and twelve development programs in human clinical trials. 

The length of time that a development program is in a given phase 
varies substantially according to factors relating to the development 
program, such as the type and intended use of the potential 
product, the clinical trial design, and the ability to enroll suitable 
patients. Generally, for partnered programs, advancement from  
one phase to the next and the related costs to do so is dependent 
upon factors that are primarily controlled by our partners. 

Our portfolio of development programs is focused on our  
Pulmonary Technology and PEGylation Technology platforms.  
Within each major category, we have both partnered and proprietary 
development programs. The estimated completion dates and  
costs for our programs are not reasonably certain. See Risk Factors 
for discussion of the risks associated with our partnered and 
proprietary research and development programs. 

In connection with our research and development for partner 
products and development programs, we earned $56.3 million, 
$81.6 million and $8.2 million in contract research revenue for the 
years ending December 31, 2006, 2005 and 2004, respectively. 

The costs incurred in connection with these programs, including allocations of facilities, cGMP quality programs and other shared costs,  
is as follows (in millions):

molecule 

StatuS1 

pulmonary 
partnered products and Development programs 
  Exubera® (insulin human [rDNA origin]) Inhalation Powder 

  Tobramycin inhalation powder (TIP) 
  Other partner programs 
proprietary Development programs 
  Next generation Exubera inhaler program 
  Amphotericin B inhalation powder 

Inhaled Antibiotics (Aerosolized amikacin) 

  Other proprietary products 
  Technology platform 

total pulmonary 

peGylation
Partnered products and development programs 
Proprietary development programs 
  PEG product (Oncology-related) 
  PEG product (Pain-related) 
  Other 

total peGylation 

other 

total research and Development expense 

Approved in U.S., EU,
Brazil, and Mexico 
Phase 3 
Various 

Pre-Clinical 
Phase 1 (pre-pivotal) 
Phase 2 
Various 
Various 

Various 

Pre-clinical 
Pre-clinical 
Various 

Various 

1 Status definitions are included in the Form 10-K, December 31, 2006, Item 1: Business section 

Years ended December 31, 

2006 

2005 

2004     

$  22.1 
12.8 
14.3 

$  51.4 
11.3 
.5 

$  68.4
7.4
7.7

17.4 
24.3 
13.6 
9.1 
12.2 

6.5 
16.7 
.1 
8.4 
16. 

2.7
8.3
2.5
11.0
11.1 

$  125.8 

$  12.8 

$  11.1

$ 

1.8 

$ 

0.7 

$ 

1.5

5.5 
2.7 
10.6 

5.3 
2.4 
4.7 

2.7
—
4.0

$  20.6 

$  13.1 

$  8.2

3.0 

8.8 

6.2

$ 149.4 

$  151.7  $ 133.5 

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13

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
  
  
 
stOck-Based cOmpensatiOn 
Effective January 1, 2006, we adopted the fair value method  
of accounting for stock-based compensation arrangements in 
accordance with SFAS No. 123R Share-Based Payment, using  
the modified prospective method of adoption. Our results of 
operations include $2.1 million of stock-based compensation 
expense for the year ended December 31, 2006. 

Prior to January 1, 2006, we accounted for stock-based 
compensation using the intrinsic value method of accounting  
in accordance with Accounting Principles Board Opinion No. 25 
“Accounting for Stock Issued to Employees” (“APB 25”). Under the 

modified prospective method of transition under SFAS No. 123R, 
we were not required to restate prior period financial statements  
to reflect expensing of stock-based compensation. Therefore, the 
results of operations for the years ended December 31, 2005  
and 2004 are not directly comparable to December 31, 2006.  
In the discussions of cost of goods sold, research and development 
expenses and general and administrative expenses included within 
Results of Operations below, we have included the amount of stock-
based compensation expense recognized during the year ended 
December 31, 2006 in order to explain the variations from 
December 31, 2005 and 2004. 

Results of Operations 
Years ended December 31, 2006, 2005 and 2004

Revenue (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Product Sales and Royalties 
Contract Research 
Exubera Commercialization Readiness 

$  153,556 
56,303 
7,859 

$  2,366  $  25,085 
8,185 

81,602 
15,311 

$  124,10 
(25,2) 
(7,452) 

$  4,281 
(7,583) 
  15,311 

100% 
(31%) 
(4%) 

—   

Total Revenue 

$  217,718 

$  126,27  $  114,270 

$  1,43 

$  12,00 

72% 

17%
(%)
N/A

11%

The increase in total revenue for the year ended December 31, 
2006 as compared to the year ended December 31, 2005  
was primarily due to an increase in Exubera product sales  
to Pfizer, partially offset by a decrease in contract research  
revenue from Pfizer. The increase in total revenue for the year 
ended December 31, 2005 as compared to the year ended  
December 31, 2004 was primarily due to Pfizer reimbursement  
of commercialization readiness costs. 

Pfizer represented 64%, 64% and 61% of our revenue for the 
years ended December 31, 2006, 2005 and 2004, respectively.  
No other single customer represented 10% or more of our total 
revenues for any of the three years ended December 31, 2006, 
2005 or 2004. 

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13

12

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

Product Sales and Royalties 
The increase in product sales and royalties for the year  
ended December 31, 2006 as compared to the year ended 
December 31, 2005 was primarily due to an increase in  
Exubera product sales to Pfizer after the approval of Exubera  
in January 2006. Also contributing to the increase was 
approximately $18.0 million from our PEGylation products. 

The increase in product sales and royalty revenue for the year 
ended December 31, 2005 as compared to the year ended 
December 31, 2004, was due primarily to $5.0 million of royalty 
revenue received from OSI Pharmaceuticals (formerly Eyetech 
Pharmaceuticals) product sales of Macugen, $1.5 million of 
Exubera product sales, and $1.4 million of product sales for 
Aerogen products received in the year ended December 31, 2005. 
These product sales and royalty revenue increases were partially 
offset by decreases of $3.6 million of product sales from our 
PEGylation Technology customers. 

We have not experienced any significant returns from our customers. 

Royalty revenues were $.0 million, $5.4 million and $0.5 million for 
the years ended December 31, 2006, 2005 and 2004, respectively. 

Contract Research 
Contract research revenue includes reimbursed research and 
development expenses as well as the amortization of deferred  
up-front signing and milestone payments received from our 
collaborative partners. Contract research revenue is expected to 
fluctuate from year to year, and future contract research revenue 
cannot be predicted accurately. The level of contract research 
revenues depends in part upon the continuation of existing 
collaborations, signing of new collaborations, and achievement  
of milestones under current and future agreements. 

Cost of goods sold (in thousands except percentages) 

The decrease in contract research revenue in 2006 compared  
to 2005 was primarily due to a $34.8 million decrease in Pfizer 
contract research revenue after the FDA and EMEA approval of 
Exubera in January 2006, and the transition from contract research 
revenue and commercialization readiness revenue from Pfizer for 
the Exubera development program to Exubera product sales. The 
decrease in contract research revenue from Pfizer was partially 
offset by a $3.7 million increase in contract research revenues  
from Novartis Pharma AG (formerly Chiron Corporation) under our 
collaboration agreement to develop a dry powder inhaled formation 
of tobramycin using our Pulmonary Technology and a $3.4 million 
increase in contract research revenue from Baxter Healthcare, 
under our agreement to develop a product to extend the half-life  
of Hemophilia A proteins using our PEGylation Technology. 

The decrease in contract research revenue for 2005 compared to 
2004 was primarily due to approximately $7.4 million decrease in 
revenue from Pfizer related to the transition of the Exubera program 
from contract research and development to commercialization 
readiness. In addition, during the year ended December 31, 2004, 
we recognized $2.0 million in revenue from a one-time payment 
related to Aventis’ termination of a collaborative program with us. 
Other decreases were primarily due to the expected fluctuations in 
contract research revenue and the timing of milestone payments. 

The estimated completion dates and costs for our programs are  
not reasonably certain. See Risk Factors in Form 10-K for the  
fiscal year-ended December 31, 2006 for discussion of the risks 
associated with our partnered and proprietary research and 
development programs.

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Cost of Goods Sold 
Product gross margin 

$  113,921 
39,635 

$  23,728 
5,638 

$  1,78 
5,287 

$  0,13 
  33,7 

$  3,30 
351 

>100% 
>100% 

20%
7%

Product gross margin % 

26% 

1% 

21%

14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The increase in cost of goods sold during the year ended  
December 31, 2006 as compared to the year ended  
December 31, 2005 is due to increased Exubera product  
sales. This resulted in an increase in gross margin percentage 
because the Exubera Inhalation Powder and Inhalers have a 
relatively higher margin than our other products. We expect  
the gross margin percentage to decline in future periods due  
to product mix and our cost-plus manufacturing arrangement.  

Cost of sales for the years ended December 31, 2006, 2005  
and 2004 includes $1.6 million, nil and nil, respectively, of  
stock-based compensation. 

The decrease in product gross margin percentage for the year 
ended December 31, 2005, as compared to the year ended 
December 31, 2004, was primarily due to $1.5 million of  
Exubera product sales at zero margin. 

Exubera commercialization readiness revenue and costs (in thousands except percentages)  

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Exubera Commercialization  
Readiness revenue 
Exubera commercialization  

$ 

7,859 

$  15,311 

readiness costs 

$ 

4,168 

$  12,268 

$ 

$ 

 —   

$  (7,452) 

$  15,311 

(4%) 

—   

$  (8,100) 

$ 12,268 

(66%) 

N/A

N/A

Exubera commercialization readiness revenue represents 
reimbursement by Pfizer of certain agreed upon operating costs, 
plus a mark-up, relating to preparation for commercial production  
in our Exubera Inhalation Powder manufacturing facilities and  
our Exubera Inhaler third party contract manufacturing locations. 
The decrease in Exubera commercialization readiness revenue  
was primarily due to the transition from readiness preparation to 
commercial production in late 2005 and early 2006. 

Exubera commercialization readiness costs are start up 
manufacturing costs we have incurred in our Exubera Inhalation 
Powder manufacturing facility and our Exubera Inhaler device third 
party contract manufacturing locations preparing for commercial 
scale manufacturing. We do not anticipate incurring any additional 
costs related to commercialization readiness. We expect that 
remaining commercialization readiness costs previously incurred  
will be amortized through October 2007. 

Research and development (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Research and development 
Purchased in-process 

$  149,381 

$  151,65 

$ 133,523 

$  (2,278) 

$ 18,136 

(2%) 

research and development 

$ 

— 

$ 

7,85 

$ 

—   

$  (7,85) 

$  7,85 

N/A 

14%

N/A 

The decrease in the research and development expense  
from the year ended December 31, 2006 compared to the  
year ended December 31, 2005, related to decreased spending  
in our inhaled insulin programs of $18.4 million and other  
programs of $1.1 million. These decreases were partially offset  
by $.7 million of non-cash stock-based compensation expense 
attributable to the adoption of SFAS 123R and $7.5 million  
related to our PEGylation programs. 

The increase in research and development expense for the  
year ended December 31, 2005 compared to the year ended 
December 31, 2004, was primarily attributable to an increase of 
$10.7 million for pulmonary programs, $4. million for PEGylation 
programs and $2.5 million in other programs. 

During the year ended December 31, 2005, we recorded a charge 
of $7. million for purchased in-process research and development 
costs in connection with our acquisition of Aerogen. The purchased 
in-process research and development costs were expensed on  
the acquisition date because the acquired technology had not yet 
reached technological feasibility and had no future alternative use 
outside of these development programs. The in-process research 
and development primarily represents two programs in clinical 
development, Amikacin and Surfactant. Amikacin is used in our 
inhaled antibiotic program in an aerosolized form. We have 
completed one Phase 2 trial and are currently planning Phase 2 
studies to examine the pharmacokinetics of the program. 

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Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

General and administrative (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

General and Administrative 

$  78,319 

$  43,852 

$  30,67 

$  34,467 

$  12,885 

7% 

42%

General and administrative expenses are associated with 
administrative staffing, business development and marketing. 

The increase in general and administrative expenses for the year 
ended December 31, 2006 as compared to the year ended 
December 31, 2005 was primarily due to the following: 

 •   Increased salary and employee-benefit costs of $26.4 million, 

including $17.8 million of stock-based compensation expense,  
of which $10. million is related to executive severance;  
$6. million of cash compensation, of which $3.7 million is  
due to executive severance; and $1.7 million of employee  
health and welfare benefits. 

•   Increased professional fees of $4. million primarily due to  
legal services related to litigation support, audit and related 
services, and other consulting services. 

•   Increased lease termination costs of $1.0 million associated with 
the winding down of operations of Bradford UK. The increase 
from lease termination costs was partially offset by lack of 
general and administrative costs due to the wind down of our 
Bradford operations. 

Litigation settlement 

The increase in general and administrative expenses for the year 
ended December 31, 2005, as compared to the year ended 
December 31, 2004 was primarily due to the following: 

•   Increased accounting fees and expenses of approximately  

$2.0 million, primarily due to Sarbanes Oxley  
compliance requirements.

•   Increased legal fees and expenses of approximately $3.0 million, 
primarily due to increased patent fees related to our proprietary 
development programs and derivative shareholder claims. 

•   Incremental head count and related expenses of $5.0 million to 
support our product planning and marketing efforts for our 
proprietary and partnered programs. 

•   Addition of approximately $1.0 million from Aerogen operations 

from the date of acquisition through December 31, 2005. 

We expect general and administrative spending to increase over the 
next few years to support increased commercial activities. 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Litigation Settlement 

$  17,710 

$ 

 — 

$ 

—   

$  17,710 

$ 

— 

>100% 

N/A 

On June 30, 2006, we, our subsidiary Nektar Therapeutics AL 
(Nektar AL), and a former officer, Milton Harris, entered into a 
Settlement Agreement and General Release (Settlement 
Agreement) with the University of Alabama Huntsville (UAH)  
related to an intellectual property dispute. Under the terms of the 
Settlement Agreement, the Company, Nektar AL, Mr. Harris and 
UAH agreed to full and complete satisfaction of all claims asserted 
in the litigation in exchange for $25 million in cash payments.  
We and Mr. Harris made an initial payment of $15.0 million on  

June 30, 2006, of which we paid $11.0 million and Mr. Harris  
paid $4.0 million. Beginning July 1, 2007, we will pay UAH 10 
annual installment payments of $1.0 million each, representing  
an accrued liability of $7.0 million at December 31 2006, or the 
present value of the future payments using an 8% annual discount 
rate. We recorded a litigation settlement charge of $17.7 million 
during the year ended December 31, 2006 which reflects the  
net present value of the settlement payments. 

16

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Amortization of other intangible assets (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Amortization of Other  
Intangible Assets 

$  4,039 

$  4,206 

$  3,24 

$ 

(167) 

$ 

282 

(4)% 

7%

Other intangible assets include proprietary technology, intellectual 
property, and supplier and customer relationships acquired from 
third parties or in business combinations. The majority of our other 
intangible assets were either impaired or fully amortized as of the 
year ending December 31, 2006. 

As of December 31, 2006, the net book value of our other 
intangible assets is $3.6 million representing the unamortized 
portion of our supplier and customer relationships intangible asset. 
This will be amortized on a straight-line basis of approximately  
$0. million per year through October 2010. Accordingly, we  
expect our amortization of other intangible assets to decrease  
to $0. million per year in the future, absent additional  
business combinations. 

Impairment of long-lived assets (in thousands except percentages)

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Impairment of  
  Long-Lived Assets 

$  9,410 

$  65,340 

$ 

— 

$  (55,30) 

$  65,340 

(86%) 

N/A 

For the year ending December 31, 2006, impairment of long-lived 
assets includes $5.5 million relating to the write-off of certain 
intangible assets relating to our Ireland operations. Additionally, as  
a result of a contract renegotiation with one of our collaboration 
partners, we determined that costs incurred relating to a 
construction-in-progress asset had no future value because the 
asset is no longer probable of being completed. Accordingly, we 
recorded an impairment charge of $2.7 million. Also, as a result of 
the winding down of our Bradford UK operations, we recorded an 
impairment charge of $1.2 million relating to the remaining 
laboratory and office equipment. 

We performed our annual impairment test for goodwill in  
October 2005 and determined at that time that the undiscounted 
cash flow from our long-range forecast for each respective 
business unit exceeded the carrying amount of the respective 
goodwill. In December 2005, we were apprised of unfavorable 

results of clinical data related to programs from our Super Critical 
Fluids Technology program in Bradford UK, which provided an 
indication that the fair value of the respective business unit’s 
goodwill was below the carrying value. Therefore, in connection  
with our year end close process, we re-performed the impairment 
analysis of goodwill and other long-lived assets for Bradford UK. 
We determined the fair value of the intangibles and other assets  
of Nektar UK based on a discounted cash flow model to be less 
than the carrying amount of goodwill and certain long-lived assets. 
Based on the above, we recorded an impairment charge to goodwill 
and long-lived assets in the year ended December 31, 2005 in the 
amount of $5.6 million and $5.7 million, respectively. 

This charge is reflected in the Impairment of long-lived assets  
line item in our Consolidated Statements of Operations. See  
Note 13 for more information regarding the winding-down of  
the Bradford facility. 

Interest Income (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Interest Income 

$  23,450 

$  13,022 

$  6,602 

$  10,428 

$  6,420 

80% 

7%

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17

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

The increase in interest income for the year ended December 31, 
2006 is primarily due to an increase in our balance of cash, cash 
equivalents, and investments in marketable securities resulting from 
our $315.0 million subordinated debt offering completed in late 
September 2005, and higher prevailing interest rates during 2006 
compared to 2005. 

The increase in interest income for the year ended December 31, 
2005, as compared to the year ended December 31, 2004, was 
primarily due to increases in average daily cash balances as a result 
of net proceeds of approximately $315.0 million in convertible 
subordinated notes in September 2005, and higher prevailing 
interest rates during 2005 compared to 2004. 

Interest expense (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Interest Expense 

$  20,256 

$  14,085 

$  25,747 

$  6,171 

$  (11,662) 

44% 

(45)%

The increase in interest expense for the year ended December  
31, 2006, as compared to the year ended December 31, 2005  
was primarily due to a higher average balance of convertible 
subordinated debt outstanding resulting from our $315.0 million 
subordinated debt offering completed in September 2005. 

For the year ended December 31, 2004, interest expense included 
a payment of approximately $12.7 million in interest made to certain 
holders of our outstanding 3.0% convertible subordinated notes 
due June 2010 which completed an exchange of $16.3 million in 

aggregate principal amount of the notes held by such holders for 
the issuance of approximately 14. million shares of our common 
stock. The net increase of $1.0 million was primarily due to the 
interest expense related to the issuance of $315.0 million of  
3.25% convertible subordinated notes in September 2005  
less the decrease in interest expense related to the retirement  
of $25.4 million and $45. million aggregate principal amount  
of our outstanding 5% and 3.5% convertible subordinated  
notes due February, 2007, and October, 2007, respectively, in 
September 2005.  

Other income (expense), net (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Other Income (Expense), net 

$  2,103 

$  (1,24) 

$ 

26 

$  3,352 

$ 

(1,545) 

>100% 

>(100)%

During the year ended December 31, 2006, we recognized a  
$2.2 million gain from the sale of an equity investment in Confluent 
Technologies. We do not expect to realize income from such 
transactions in the future. Other expense, net of the gain from the 
sale of our investment in Confluent Technologies is $0.1 million and 
is primarily related to net foreign exchange gains and losses. 

During the year ended December 31, 2004, we terminated our 
lease obligation related to 45,574 square feet of space located  
at our headquarters in San Carlos, California. We recorded other 
expense of approximately $1.1 million, representing the write-off  
of our capital lease asset partially offset by a reduction in the 
present value of our future rent liability. In addition, other income  
for the year ended December 31, 2004, included $0.7 million of 
income related to our real estate partnership which was dissolved  
in September 2004. 

Loss on debt extinguishment (in thousands except percentages) 

Years ended December 31

2006  

2005  

2004 

Increase/ 
(Decrease) 
2006 vs 2005 

Increase/ 
(Decrease) 
2005 vs 2004 

Percentage 
Increase/ 
(Decrease) 
2006 vs 2005 

Percentage 
Increase/ 
(Decrease) 
2005 vs 2004

Loss on Debt Extinguishment 

$ 

—   

$ 

303 

$  ,258 

$ 

(303) 

$ 

(8,55) 

N/A 

(7)%

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1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
During the year ended December 31, 2005, we recognized a loss 
on debt extinguishment of approximately $0.3 million in connection 
with the retirement of $25.4 million and $45. million aggregate 
principal amount of our outstanding 5% and 3.5% convertible 
subordinated notes due February 2007 and October 2007, 
respectively for total cash payments of $71.0 million, in privately 
negotiated transactions. As a result these transactions, we wrote  
off approximately $0.1 million and $0.5 million of capitalized debt 
issuance costs related to the 5% and 3.5% convertible 
subordinated notes, respectively. 

During the year ended December 31, 2004, we recognized a  
loss on debt extinguishment in connection with two privately 
negotiated transactions to convert our outstanding convertible 
subordinated notes into shares of our common stock. In  
January 2004, certain holders of our outstanding 3.5% convertible 
subordinated notes due October 2007 completed an exchange  
and cancellation of $.0 million in aggregate principal amount of 
the notes for the issuance of 0.6 million shares of our common 
stock. In February 2004, certain holders of our outstanding  
3% convertible subordinated notes due June 2010 converted 
approximately $36.0 million in aggregate principal amount of  
such notes for approximately 3.2 million shares of our common 
stock and a cash payment of approximately $3.1 million. As a result 
of these transactions, we recognized losses on debt extinguishment 
of approximately $7.8 million and $1.5 million, respectively. 

Liquidity and Capital Resources 
We had cash, cash equivalents and investments in marketable 
securities of $467.0 million and indebtedness of $447. million, 
including $417.7 million of convertible subordinated notes,  
$20.5 million in capital lease obligations and $.7 million in  
other long-term liabilities as of December 31, 2006. 

We have financed our operations primarily through revenue from 
product sales and research and development contracts, public and 
private placements of debt and equity securities and financing of 
equipment acquisitions and certain tenant leasehold improvements. 
We do not utilize off-balance sheet financing arrangements as a 
source of liquidity or financing. 

Cashflow Activities 
During the year ended December 31, 2006, we used approximately 
$2.7 million in operating cash flows. To date, revenue has not been 
sufficient to cover our expenses and we are not generating positive 
cash flow through our operations. Cash used in operating activities 
included an $11.0 million cash payment made in connection with 
the University of Alabama Huntsville litigation settlement. In 2006, 
we also purchased $22.5 million of property and equipment and 
repaid $10.5 million in debt obligations. These uses of cash were 
partially offset by $22.3 million in cash collected from employees 
for the purchase of common stock. 

During the year ended December 31, 2005, we used $78.0 million 
in operating cashflows. We purchased $18.0 million of property  
and equipment and spent $30.7 million for the purchase of 
Aerogen, Inc. Additionally, we repaid $2.5 million in debt obligations. 
These uses of cash were offset by $234.7 million in proceeds  
from the issuance, net of repurchases, of convertible subordinated 
notes, as well as proceeds from the issuance of common stock  
to employees and a secondary offering of $10. million and  
$31.6 million, respectively. 

We expect to use a substantial portion of our cash to fund  
our on-going operations over the next few years and to  
repay our $447. million of indebtedness outstanding as of  
December 31, 2006, including $102.7 million of convertible 
subordinated notes due in 2007. In February 2007, we repaid  
$36.0 million of our 5% convertible subordinated notes with cash.

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18

 
 
 
 
 
 
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

Contractual Obligations 

The following is a summary of our contractual obligations as of December 31, 2006 (in thousands) 

obligations 1 
Convertible subordinated notes, including interest 2 
Capital leases, including interest 
Operating leases 
Purchase commitments 3 
Litigation Settlement and other long-term liabilities,  

including interest 

Payments due by period 

Total 

<=1 yr 
2007 

2–3 yrs 
2008–200 

3–5yrs
2010–2011 

2012+ 

$  478,711 
41,834 
17,55 
44,457 

$  115,083 
3,2 
3,770 
44,457 

$  20,475 
8,200 
6,632 

$  20,475 
8,376 
5,741 

$  322,678
21,266
1,452

—   

—   

—   

12,12 

3,12 

2,000 

2,000 

5,000

$  54,726 

$  170,431 

$  37,307 

$  36,52 

$  350,36

1  The above table does not include certain commitments and contingencies which are discussed in Note 9 of Notes to Consolidated Financial Statements. 

2  We repaid $36.0 million of the 5% convertible subordinated notes on February 7, 2007. 

3   Substantially all of this amount had been ordered on open purchase orders as of December 31, 2006 under existing contracts with the Company. This amount does not 

represent minimum contract termination liability. 

Given our current cash requirements, we forecast that we will have 
sufficient cash to meet our net operating expense requirements and 
contractual obligations through 2007. We plan to continue to invest 
in our growth and our future cash requirements will depend upon 
the timing of these investments. Our capital needs will depend on 
many factors, including continued progress in our research and 
development programs, progress with preclinical and clinical trials  
of our proprietary and partnered product candidates, the time and 
costs involved in obtaining regulatory approvals, the costs of 
developing and scaling our clinical and commercial manufacturing 
operations, the costs involved in preparing, filing, prosecuting, 
maintaining and enforcing patent claims, the need to acquire 
licenses to new technologies and the status of competitive products. 

To date we have been primarily dependent upon equity and 
convertible debt financings for capital and have incurred substantial 
debt as a result of our issuances of subordinated notes that are 
convertible into our common stock. Our substantial debt, the market 
price of our securities, and the general economic climate, among 
other factors, could have material consequences for our financial 
position and could affect our sources of short-term and long-term 
funding. There can be no assurance that additional funds, if and 
when required, will be available to us on favorable terms, if at all. 

Critical Accounting Policies 
The preparation of financial statements in conformity with  
U.S. Generally Accepted Accounting Principles (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 
financial statements and the reported amounts of revenues and 
expenses during the reporting period. 

We base our estimates on historical experience and on various 
other assumptions that we believe to be reasonable under the 
circumstances, the results of which form our basis for making 
judgments about the carrying value of assets and liabilities that  
are not readily apparent from other sources, and evaluate our 
estimates on an ongoing basis. Actual results may differ from  
those estimates under different assumptions or conditions.  
We have determined that for the periods reported in this report,  
the following accounting policies and estimates are critical in 
understanding our financial condition and results of our operations. 

Revenue Recognition 
Product revenues from Exubera Inhalation Powder and Inhalers  
are primarily derived from the cost-plus manufacturing and supply 
agreement with Pfizer, are subject to quarterly manufacturing 
variance adjustments, and are recognized at the earlier of 
acceptance of products by Pfizer or 60 days from shipment.  
Under generally accepted accounting principles, revenue should  
be recognized when the related revenue is fixed and determinable. 
Under contracts such as the Pfizer contract, where the right of 
return exists, management must make a determination whether to 
estimate returns based on historical activity or to defer recognition 
of revenue until the contractual right of return period has lapsed. 

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21

 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Because commercial activities began in 2006, we did not have 
historical return data to use as a basis for product returns. To date, 
Pfizer has not returned any Exubera Inhalation Powder or Inhalers. 

Product revenues and the related cost of goods sold for products 
that were shipped to Pfizer but have not been recognized within  
60 days are recorded as deferred revenue, net of the deferred 
costs. As of December 31, 2006, we had net deferred margin 
relating to Exubera sales of $5.2 million, comprised of $23.1 million 
of deferred revenue and $17. million of deferred cost of sales. In 
the future, in lieu of deferring all revenue and related cost of sales, 
we expect to recognize revenue upon shipment of goods to Pfizer, 
net of a reserve for estimated product returns. We will make this 
change when we are able to reasonably estimate returns based on 
historical return experience and other factors. 

Contract research revenue includes amortization of up-front fees. 
Up-front fees should be recognized ratably over the expected 
benefit period under the arrangement. Given the uncertainties of 
research and development collaborations, significant judgment is 
required to determine the duration of the arrangement. We have 
$17.7 million of deferred up-front fees related to two research and 
collaboration agreements that are being amortized over an average 
of 10 years. We considered shorter and longer amortization periods. 
The shortest reasonable period is the end of the development 
period (estimated to be 4 to 6 years). Given the statistical 
probability of drug development success in the bio-pharma industry, 
development programs have only a 5%-10% probability of reaching 
commercial success. The longest period is either the contractual  
life of the agreement, which is generally 10 years from the first 
commercial sale, or the end of the patent life, which is frequently 
15–17 years. If we had determined a longer or shorter amortization 
period was appropriate, our annual up-front fee amortization could 
be as low as $1.0 million or as high as $4.4 million. 

Milestone payments received are deferred and recorded as  
revenue ratably over the next period of continued development. 
Management makes its best estimate of the period of time until  
the next milestone is reached. This estimate affects the recognition 
of revenue for completion of the previous milestone. The original 
estimate is periodically evaluated to determine if circumstances 
have caused the estimate to change and if so, amortization of 
revenue is adjusted prospectively. 

Stock-Based Compensation 
During 2006, we issued RSU awards totaling 1,088,300 shares  
of our common stock to certain employees and directors. The RSU 
awards are settled by delivery of shares of our common stock on  
or shortly after the date the awards vest. A significant portion of 
these awards vest base upon achieving three pre-determined 
performance milestones which were initially expected to occur  
over a period of 40 months. We are expensing the grant date fair 
value of the awards ratably over the expected performance period. 
During the period ended September 30, 2006 management 
determined that one of the milestones, representing 40% of the 
total awards, was no longer probable (as defined in SFAS No. 5: 
Accounting for Contingencies) of vesting. As a result, we reversed 
all previously recorded compensation expense related to this 
performance milestone, or approximately $0.8 million. If we had 

determined that this milestone was probable, we would have 
expensed an additional $1. million during the year ended 
December 31, 2006. The remaining 60% of the performance  
based RSUs are expected to vest over a 27 month period  
from the award date. We recorded compensation expense of  
$5.0 million in the year ended December 31, 2006 related to  
the remaining 60% of these performance-based RSU awards. 

Impairment of Goodwill and Other Long-Lived Assets 
In accordance with SFAS No. 142, Goodwill and Other Intangible 
Assets, goodwill is tested for impairment at least annually or on an 
interim basis if an event occurs or circumstances change that would 
Indicate the carrying value may not be fully recoverable. 

Goodwill is tested for impairment using a two-step approach.  
The first step is to compare our fair value to our net asset value, 
including goodwill. If the fair value of net assets is greater than our 
book value of net assets, goodwill is not considered impaired and 
the second step is not required. If the fair value is less than our net 
asset value, the second step of the impairment test measures the 
amount of the impairment loss, if any. The second step of the 
impairment test is to compare the implied fair value of goodwill to 
its carrying amount. If the carrying amount of goodwill exceeds its 
implied fair value, an impairment loss is recognized equal to that 
excess. The implied fair value of goodwill is calculated in the same 
manner that goodwill is calculated in a business combination, 
whereby the fair value is allocated to all of the assets and liabilities 
(including any unrecognized intangible assets) as if they had been 
acquired in a business combination and the fair value was the 
purchase price. The excess “purchase price” over the amounts 
assigned to assets and liabilities would be the implied fair value  
of goodwill. 

In accordance with SFAS No. 144, Accounting for the Impairment or 
Disposal of Long-Lived Assets, we perform a test for recoverability 
of our intangible and other long-lived assets whenever events or 
changes in circumstances indicate that the carrying value of the 
assets may not be recoverable. An impairment loss would be 
recognized only if the carrying amount of an intangible or long-lived 
asset exceeds the sum of the undiscounted cash flows expected to 
result from the use and eventual disposal of the asset. 

In December 2005, we were apprised of unfavorable results at  
our Bradford, UK facility and certain clinical data related to those 
activities. We re-performed our annual impairment test of the 
goodwill assigned to the Super Critical Fluids reporting unit.  
We determined the fair value of the Super Critical Fluids reporting 
unit, based on a discounted cash flow analysis, was less than the 
carrying amount of the reporting units assets, including assigned 
goodwill. Consequently, we recorded an impairment charge of  
$5.6 million in the year ended December 31, 2005. In connection 
with this impairment, we also impaired certain equipment used at 
the Bradford location resulting an additional charge of $5.7 million. 
These charges are reflected in the Impairment of long-lived assets 
line item in our Consolidated Statements of Operations. See Note 
13 in Notes to Consolidated Financial Statements for more 
information regarding the winding down of the Bradford facility. 

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20

 
 
 
 
 
 
 
Management’s Discussion and analysis of  
Financial condition and Results of Operations (continued)

During the second half of 2006, we began a process of evaluating 
business activities outside our focus areas of pulmonary technology 
and PEGylation technology. In late December 2006, we entered 
into a non-binding letter of intent to sell our nebulizer device 
business. We determined that the non-binding letter of intent to  
sell the nebulizer device business, coupled with our general efforts 
to focus on core technologies, were indicators that our intangible 
asset related to these products acquired from the 2005 Aerogen 
acquisition does not have future value. After reassessing the 
remaining useful life of this intangible asset and evaluating the 
historical net losses from the nebulizer device business, we 
determined the intangible asset was fully impaired and recorded  
a $5.5 million charge for the year ended December 31, 2006.  
This charge is reflected in the Impairment of long-lived assets line 
item in our Consolidated Statements of Operations.  

Recent Accounting Pronouncements 

SFAS No. 157 
In September 2006, the FASB issued SFAS No. 157, Fair Value 
Measurements, which defines fair value, establishes a framework for 
measuring fair value in GAAP, and expands disclosures about fair 
value measurements. SFAS No. 157 does not require any new fair 
value measurements, but provides guidance on how to measure fair 
value by providing a fair value hierarchy used to classify the source 
of the information. This statement is effective beginning in October 
2008. We are evaluating whether adoption of this statement will 
result in a change to its fair value measurements. 

SAB No. 108 
In September 2006, the SEC issued SAB No. 108,  
Considering the Effects of Prior Year Misstatements when 
Quantifying Misstatements in Current Year Financial Statements. 
SAB 108 requires analysis of misstatements using both an income 
statement (rollover approach) and a balance sheet (iron curtain) 
approach in assessing materiality and provides for a one-time 
cumulative effect transition adjustment. SAB 108 is effective  
for the Company’s fiscal year 2007 annual financial statements.  
We do not expect the adoption of the statement to have a material 
impact on its consolidated results of operations, financial position  
or cash flows. 

FIN 48 
In July 2006, the FASB issued Interpretation No. 48, Accounting for 
Uncertainty in Income Taxes. This interpretation, among other things, 
creates a two-step approach for evaluating uncertain tax positions. 
Recognition occurs when an enterprise concludes that a tax 
position, based on its technical merits, is more likely than not to be 
sustained upon examination. Measurement determines the amount 
of benefit that more likely than not will be realized. De-recognition 
of a tax position that was previously recognized would occur when  
a company subsequently determines that a tax position no longer 
meets the more-likely-than-not threshold of being sustained.  
FIN 48 specifically prohibits the use of a valuation allowance as a 
substitute for de-recognition of tax positions, and it has expanded 
disclosure requirements. FIN 48 is effective for fiscal years 
beginning after December 15, 2006, in which the impact of 
adoption should be accounted for as a cumulative-effect adjustment 
to the beginning balance of retained earnings. We believe adoption 
of this pronouncement will not impact our financial position, results 
of operation or cash flows due to our history of net losses and  
fully reserved deferred tax assets, however we are still evaluating  
FIN 48 and have not yet determined the impact the adoption will 
have on the our tax disclosures in the Notes to the Consolidated 
Financial Statements. 

Quantitative and Qualitative Disclosures about Market Risk 

interest rate risk 
The primary objective of our investment activities is to preserve 
principal while at the same time maximizing yields without 
significantly increasing risk. To achieve this objective, we invest in 
highly liquid and high quality debt securities. Our investments in 
debt securities are subject to interest rate risk. To minimize the 
exposure due to an adverse shift in interest rates, we invest in short 
term securities and maintain a weighted average maturity of one 
year or less. 

A hypothetical 50 basis point increase in interest rates would result 
in an approximate $0.7 million decrease, less than 0.5%, in the fair 
value of our available-for-sale securities at December 31, 2006. 
This potential change is based on sensitivity analyses performed  
on our investment securities at December 31, 2006. Actual results 

may differ materially. The same hypothetical 50 basis point increase 
in interest rates would have resulted in an approximate $1.1 million 
decrease, less than 1%, in the fair value of our available-for-sale 
securities at December 31, 2005. 

FOreign currency risk 
Our operations include research and development, manufacturing, 
sales and purchasing activities in the U.S. and Europe. As a result, 
our financial results could be affected by factors such as changes  
in foreign currency exchange rates or economic conditions in  
the foreign markets in which we have exposure. Our results of 
operations are exposed to changes in exchange rates between the 
U.S. dollar and various foreign currencies, most significantly the 
British pound and Euro. 

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23

 
 
 
 
 
 
 
Report of independent  
Registered Public accounting Firm

The Board of Directors and Shareholders of  
Nektar Therapeutics 

We have audited the accompanying consolidated balance sheets of Nektar Therapeutics as of December 31, 2006 and 2005, and  
the related consolidated statements of income, shareholders’ equity, and cash flows for each of the three years in the period ended 
December 31, 2006. Our audits also included the financial statement schedule listed in the index at 15(a). These financial statements  
and schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial  
statements and schedule based on our audits. 

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those 
standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of 
material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial 
statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as 
evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. 

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of  
Nektar Therapeutics at December 31, 2006 and 2005, and the consolidated results of its operations and its cash flows for each of the 
three years in the period ended December 31, 2006, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, 
the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, present fairly in  
all material respects the information set forth therein. 

As discussed in Notes 1 and 15 to the Notes to Consolidated Financial Statements, in fiscal 2006 Nektar Therapeutics changed its 
method of accounting for stock-based compensation in accordance with guidance provided in Statement of Financial Accounting 
Standards No. 123(R), Share-Based Payment.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 
effectiveness of Nektar Therapeutics’ internal control over financial reporting as of December 31, 2006, based on criteria established in 
Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report 
dated February 28, 2007 expressed an unqualified opinion thereon. 

/s/    ERNST & YOUNG LLP 

Palo Alto, California 

February 28, 2007 

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22

 
 
 
 
 
 
 
 
 
 
Report of independent  
Registered Public accounting Firm

The Board of Directors and Shareholders of  
Nektar Therapeutics 

We have audited management’s assessment, included in the accompanying “Management’s Report on Internal Control over Financial 
Reporting,” that Nektar Therapeutics maintained effective internal control over financial reporting as of December 31, 2006, based on 
criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission (the COSO criteria). Nektar Therapeutics’ management is responsible for maintaining effective internal control over financial 
reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion 
on management’s assessment and an opinion on the effectiveness of the company’s internal control over financial reporting based on  
our audit. 

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States).  
Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control  
over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over 
financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal  
control, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides  
a reasonable basis for our opinion. 

A company’s 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 generally accepted  
accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to  
the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the 
company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in 
accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in 
accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention 
or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the  
financial statements. 

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any 
evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, 
or that the degree of compliance with the policies or procedures may deteriorate. 

In our opinion, management’s assessment that Nektar Therapeutics maintained effective internal control over financial reporting as  
of December 31, 2006, is fairly stated, in all material respects, based on the COSO criteria. Also, in our opinion, Nektar Therapeutics 
maintained, in all material respects, effective internal control over financial reporting as of December 31, 2006, based on the COSO criteria. 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the 
consolidated balance sheets of Nektar Therapeutics as of December 31, 2006 and 2005, and the related consolidated statements  
of operations, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2006, of  
Nektar Therapeutics and our report dated February 28, 2007 expressed an unqualified opinion thereon. 

/s/    ERNST & YOUNG LLP 

Palo Alto, California 

February 28, 2007 

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25

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Management’s Report on  
internal control Over Financial Reporting

As Nektar’s Chief Executive Officer and Chief Financial Officer, we are responsible for establishing and maintaining adequate internal 
control over financial reporting (as defined in Rule 13a-l5(f) under the Securities Exchange Act of 134). Our internal control system is 
designed to provide reasonable assurance to management, users of our financial statements and our board of directors regarding the 
reliability of financial reporting and preparation of published financial statements in accordance with accounting principles generally 
accepted in the United States (“GAAP”). 

A control deficiency exists when the design or operation of a control does not allow management or employees, in the normal course of 
performing their assigned functions, to prevent or detect misstatements on a timely basis. A significant deficiency is a control deficiency,  
or combination of control deficiencies, that adversely affects the company’s ability to initiate, authorize, record, process, or report external 
financial data reliably in accordance with GAAP such that there is a more than a remote likelihood that a misstatement of the company’s 
annual or interim financial statements, which is more than inconsequential will not be prevented or detected. A material weakness is a 
control deficiency, or combination of control deficiencies, that results in more than a remote likelihood that a material misstatement of the 
annual or interim financial statements will not be prevented or detected. 

Our management has assessed our internal control over financial reporting using the criteria issued in the report Internal Control—
Integrated Framework by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, our 
management has concluded that our internal control over financial reporting was effective as of December 31, 2006. 

Our independent registered public accounting firm has issued an attestation report on management’s assessment of our internal control 
over financial reporting which is included elsewhere herein.

24

24

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25

 
 
 
 
 
 
 
 
 
 
 
 
 
 
nektar Therapeutics 
consolidated Balance Sheets
(In thousands, except per share information) 

December 31, 

aSSetS
Current assets: 
  Cash and cash equivalents 
  Short-term investments 

 Accounts receivable, net of allowance of $357 and $70 
  at December 31, 2006 and 2005, respectively. 
Inventory 

  Other current assets 

  Total current assets 

Long-term investments 
Property and equipment, net 
Goodwill 
Other intangible assets, net 
Other assets 

Total assets 

liaBilitieS anD StocKholDerS’ eQuity
Current liabilities: 
  Accounts payable 
  Accrued compensation 
  Accrued expenses 
Interest payable 

  Capital lease obligations, current portion 
  Deferred revenue, current portion 
  Convertible subordinated notes, current portion 
  Other current liabilities 

  Total current liabilities 

Convertible subordinated notes 
Capital lease obligations 
Deferred revenue 
Other long-term liabilities 

  Total liabilities 

Commitments and contingencies 
Stockholders’ equity: 
  Preferred stock 

 Common stock, $0.0001 par value; 300,000 authorized; 1,280 shares and  
  87,707 shares issued and outstanding at December 31, 2006 and 2005, respectively 

  Capital in excess of par value 
  Deferred compensation 
  Accumulated other comprehensive income (loss) 
  Accumulated deficit 

  Total stockholders’ equity 

Total liabilities and stockholders’ equity 

The accompanying notes are an integral part of these consolidated financial statements. 

26
26

2006 

2005 

$ 

63,760  $  261,273  

394,880 

214,28

47,148 
14,656 
14,595 

12,44
18,627  
12,521

$ 

535,039  $  51,843

8,337 
133,812 
78,431 
3,626 
8,932 

0,222
142,127 
78,431 
13,452 
14,47

$ 

768,177  $  858,554

$ 

8,160  $ 

12,994 
16,987 
3,814 
711 
16,409 
102,653 
3,586 

16,131  
10,385  
12,43  
3,71  
536  

15,487
—
10,826

$ 

165,314  $ 

6,55

315,000 
19,759 
23,697 
17,347 

417,653
20,470
8,374
15,651

$ 

541,117  $ 

531,743 

— 

—    

9 
1,283,982 
— 
62 


  1,233,60
          (2,4)
           (1,707)
(1,056,993)       (02,232)

227,060 

326,811

$ 

768,177  $  858,554 

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27

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
  
 
 
 
 
 
 
 
 
 
nektar Therapeutics  
consolidated Statements Of Operations 
(in thousands, except per share information) 

Revenue: 
  Product sales and royalties 
  Contract research 
  Exubera commercialization readiness 

Total revenue 
Operating costs and expenses:
  Cost of goods sold 
  Exubera commercialization readiness costs 
  Research and development 
  General and administrative 
  Litigation settlement 
  Amortization of intangible assets 
Impairment of long lived assets 

  Purchased in-process research and development 

Total operating costs and expenses 

Loss from operations 
Interest income 
Interest expense 
Other income (expense), net 
Loss on extinguishment of debt 

Loss before (provision) benefit for income taxes 
(Provision) benefit for income taxes 

Net loss 

Basic and diluted net loss per share 

Shares used in computing basic and diluted net loss per share 

The accompanying notes are an integral part of these consolidated financial statements. 

26

26

Years ended December 31, 

2006 

2005 

2004 

$  153,556  $  2,366  $ 

56,303 
7,859 

81,602 
15,311 

25,085
8,185 
—

$  217,718  $  126,27  $  114,270 

113,921 
4,168 
149,381 
78,319 
17,710 
4,039 
9,410 

— 

23,728 
12,268 
151,65 
43,852 
— 
4,206 
65,340 
7,85 

1,78 
—
  133,523 
30,67 
— 
3,24
—
—

$  376,948  $  308,12  $  188,212

(159,230)   
23,450 
(20,256)   
2,103 
— 

(182,633) 
13,022 
(14,085) 
(1,24) 
(303) 

(73,42)
6,602
(25,747)
26
(,258)

$  (153,933)  $  (185,248)  $  (102,04)
163

(828)   

137 

$  (154,761)  $  (185,111)  $  (101,886)

$ 

(1.72)  $ 

(2.15)  $ 

(1.30)

89,789 

85,15 

78,461

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nektar Therapeutics consolidated  
Statements Of Stockholders’ equity 
(in thousands) 

Preferred 
Shares 

Common 
Shares 

Amount 

Par 
Shares  Paid In  Shares  Value 

Accumulated 
Other 

Capital In 
Excess of 
Par Value  Compensation  Income/(Loss) 

Deferred 

Comprehensive  Accumulated  Stockholders’

Deficit 

Equity 

Total

40 

— 

56,17   

6 

778,500 

(38) 

58 

(615,235) 

  164,11

— 

— 

1,817    — 

13,665 

— 

— 

,500   

1 

16,411 

— 

(20) 

— 

— 

— 
— 
— 
— 

— 
— 
— 

— 

— 

— 

— 

— 
— 
— 
— 

— 
— 
— 

15,74   

1 

11,281 

880    — 

— 

—    — 

—    — 

—    — 
126    — 
66    — 
12    — 

—    — 
—    — 
—    — 

678 

247 

3,02 
1,285 
1,158 
— 

448 
— 
— 

— 

— 

— 

— 

— 

— 

(2,726) 
— 
— 
— 

— 

— 

—   

— 

— 

— 

— 
—  
— 
—  

— 

13,665

— 

  16,412

— 

  11,282

— 

— 

— 

— 
— 
— 
— 

—

678

247

1,176
1,285
1,158
—

— 
— 
— 

— 
(1,314) 
— 

— 
— 
(101,886) 

448
(1,314)
(101,886) 

(103,200)

20 

— 

84,572   

8 

1,187,575 

(2,764) 

(356) 

(717,121) 

467,342

Balance at December 31, 2003 
Common stock issued upon  
  exercise of stock options 
Common stock issued in  
  secondary offering net of  
issuance costs of $3,088 

Conversion of convertible  
  subordinated debentures net  
  of issuance costs of $2,315 
Preferred stock purchased  
  by Enzon, Inc. 
Compensation in connection  
  with stock options granted  

to consultants 

Compensation in connection  
  with severance 
Amortization of deferred  
  compensation 
Shares issued for ESPP 
Shares issued for retirement plans 
Exercise of warrants 
Tax benefit related to employee  
  stock option exercises 
Other comprehensive income (loss) 
Net loss 

Comprehensive loss 

Balance at December 31, 2004 
Common stock issued upon  
  exercise of stock options 
Common stock issued in secondary  
  offering net of issuance  
  costs of $427 
Compensation in connection  
  with stock options granted  

— 

— 

1,015    —  

,621 

— 

— 

1,81   

1 

31,563 

— 

— 

— 

— 

— 

— 

to consultants 

— 

— 

—    — 

208 

Amortization of deferred  
  compensation 
Shares issued for ESPP 
Shares issued for retirement plans 
Other comprehensive income (loss) 
Net loss 

Comprehensive loss 

— 
— 
— 
—   
— 

— 
— 
— 
—   
— 

34    — 
108    — 
87    — 
—     —  
—    — 

2,03 
1,23 
1,445 

—   
— 

(185) 
— 
— 
— 
— 

— 
— 
— 
(1,351) 
— 

— 

,621

— 

31,564

— 

208

— 
— 
— 
—    

(185,111) 

1,854
1,23
1,445
(1,351)
(185,111)

(186,462)

Balance at December 31, 2005 

20 

—   

87,707  $   

$  1,233,60 

$  (2,4) 

$  (1,707) 

$ 

(02,232)  $  326,811 

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2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
nektar Therapeutics consolidated  
Statements Of Stockholders’ equity (continued) 
(in thousands) 

Preferred 
Shares 

Common 
Shares 

Amount 

Par 
Shares  Paid In  Shares  Value 

Accumulated 
Other 

Capital In 
Excess of 
Par Value  Compensation  Income/(Loss) 

Deferred 

Comprehensive  Accumulated  Stockholders’

Total

Common stock issued upon  
  exercise of stock options 
Stock-based compensation 
Compensation in connection  
  with stock options granted  

to consultants 

Conversion of preferred Stock 
Exercise of warrants 
Transition adjustment upon  
  adoption of SFAS No 123R 
Shares issued for ESPP 
Shares issued for retirement plans 
Other comprehensive income (loss) 
Net loss 

Comprehensive loss  

— 
— 

— 
(20) 
—  

— 
— 
— 
— 
— 

— 
— 

— 
— 
— 

— 
— 
— 
— 
— 

2,326    — 
—    — 

20,642 
2,143 

—    — 
1,023    — 
12    — 

—   

10    — 
103    — 
—    — 
—    — 

31 
— 
— 

(2,4) 
1,617 
1,808 
— 
— 

— 
— 

— 
— 
— 

2,4 
— 
— 
— 
— 

— 
— 

— 
— 
— 

— 
— 
— 
1,76 
— 

Deficit 

Equity 

— 
— 

— 
— 
— 

— 
— 
— 
— 
(154,761) 

20,642
2,143

31
—
— 

— 
1,617
1,808
1,76
(154,761)

(152,2)

Balance at December 31, 2006 

— 

— 

91,280  $  9 

$  1,283,982 

$ 

— 

$ 

62 

$   (1,056,993)  $  227,060

The accompanying notes are an integral part of these consolidated financial statements. 

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nektar Therapeutics  
consolidated Statements Of cash Flows
(in thousands) 

cash flows used in operating activities: 
Net loss 
Adjustments to reconcile net loss to net cash used in operating activities: 
  Depreciation and amortization 
  Stock-based compensation 

Impairment of long-lived assets 

  Amortization of gain related to sale of building 
  Gain on disposal of investment 
  Loss on termination of capital lease 
  Loss (gain) on sale or disposal of assets 
  Loss on extinguishment of debt 

In process research and development 

  Tax benefit related to employee stock option exercises 
Changes in assets and liabilities: 
  Decrease (increase) in trade accounts receivable 
  Decrease (increase) in inventories 
  Decrease (increase) in other assets 

Increase (decrease) in accounts payable 
Increase (decrease) in accrued compensation 
Increase (decrease) in accrued expenses 
Increase (decrease) in interest payable 
Increase (decrease) in deferred revenue 
Increase (decrease) in other liabilities 

Net cash used in operating activities 

cash flows from investing activities:
  Purchases of investments 
  Sales of investments 
  Maturities of investments 
  Business acquisition, net of cash acquired 
  Purchases of property and equipment 
  Proceeds from sale of partnership interest 

Net cash provided by (used in) investing activities 

cash flows from financing activities:
  Proceeds from debt and capital lease financing 
  Payments of loan and capital lease obligations 
  Proceeds from convertible subordinated notes 
  Repurchase of convertible subordinated notes 

Issuance of common stock, net of issuance costs 

Net cash provided by financing activities 

Effect of exchange rates on cash and cash equivalents 

Net increase (decrease) in cash and cash equivalents 
Cash and cash equivalents at beginning of year 

Cash and cash equivalents at end of year 

Supplemental disclosure of cash flows information (in thousands): 
Cash paid for interest 
Cash paid for income taxes 
Supplemental schedule of non-cash investing and financing activities (in thousands): 
Conversion of debt into common stock 
Deferred compensation related to the issuance of stock options 

The accompanying notes are an integral part of these consolidated financial statements. 

30

Years ended December 31, 

2006 

2005 

2004 

$  (154,761)  $  (185,111)  $  (101,886)

33,509 
30,982 
9,410 

(874)   
(2,252)   
— 
123 
— 
— 
— 

(34,654)   
3,971 
1,095 
(7,971)   
3,581 
4,548 
23 
16,245 
4,310 

25,311 
3,507 
65,340 

(34)   
— 
1,136 
— 
303 
7,85 
— 

2,468 
(7,420)   
(3,542)   
,00 
1,756 
4,823 
1,781 
(7,174)   
2,80 

18,011
3,25
—
—
—
—
(462)
,258
—
448

(7,404)
(2,132)
(3,686)
(1,384)
(446)
(1,373)
(426)
11,341
(1,260)

$ 

(92,715)  $ 

(77,8)  $ 

(78,142)

(502,230)   
2,252 
405,622 
— 

(22,524)   

(234,1)   
88,50 
227,113 
(30,714)   
(17,55)   

— 

— 

(534,717)
177,547 
220,260 
—
(27,14)
22,450

$  (116,880)  $  32,403  $  (141,654)

— 

(10,488)   

261 
(2,517)   

— 
—  
22,259 

  305,645 

(70,64)   
42,424 

4,3
(7,71)
—
(376)
211,362

$ 

11,771  $  274,84  $  207,414

311 

(45)   

—

$  (197,513)  $  22,20  $ 

261,273 

32,064 

(12,382)
44,446

$ 

63,760  $  261,273  $ 

32,064

$ 
$ 

$ 
$ 

14,371  $  12,468  $ 
27  $ 

—  $ 

25,226
238

—  $ 
—  $ 

—  $  186,02
3,02

2,03  $ 

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notes To consolidated Financial Statements   
December 31, 2006

nOte 1—OrganizatiOn and summary  
OF signiFicant accOunting pOlicies 

OrganizatiOn and Basis OF presentatiOn 
We are a biopharmaceutical company headquartered in San Carlos, 
California and incorporated in Delaware. Our mission is to develop 
breakthrough products that make a difference in patients’ lives. We 
create differentiated, innovative products by applying our platform 
technologies to established or novel medicines. Our two leading 
technology platforms are Pulmonary Technology and PEGylation 
Technology. Nine products using these technology platforms have 
received regulatory approval in the U.S. or the European Union (EU). 
Our two technology platforms are the basis of substantially all of the 
partnered and proprietary programs. In June 2006, we terminated 
the research and development activity related to the Nektar Super 
Critical Fluids Technology, which was conducted at our Bradford, 
UK facility. 

principles OF cOnsOlidatiOn  
and use OF estimates 
Our consolidated financial statements include the financial position 
and results of operations and cash flows of our wholly-owned 
subsidiaries: Nektar Therapeutics AL, Corporation (“Nektar AL”); 
Nektar Therapeutics UK, Ltd. (“Bradford”), Nektar Therapeutics 
(India) Private Limited, and Aerogen Inc. All intercompany accounts 
and transactions have been eliminated in consolidation. 

Our consolidated financial statements are denominated in U.S. 
dollars. Accordingly, changes in exchange rates between the 
applicable foreign currency and the U.S. dollar will affect the 
translation of each foreign subsidiary’s financial results into U.S. 
dollars for purposes of reporting our consolidated financial results. 
Translation gains and losses are included in accumulated other 
comprehensive loss in the stockholders’ equity section of the 
balance sheet. To date, such cumulative translation adjustments 
have not been material to our consolidated financial position. 

The preparation of financial statements in conformity with U.S. 
Generally Accepted Accounting Principles (“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 financial 
statements and the reported amounts of revenues and  
expenses during the reporting period. Actual results could  
differ from those estimates. 

reclassiFicatiOns 
Certain items previously reported in specific financial statement 
captions have been reclassified to conform to the current period 
presentation. Such reclassifications have not impacted previously 
reported revenues, operating loss or net loss. 

Fair value OF Financial instruments 
The carrying amounts of certain of the Company’s financial 
instruments, including cash and cash equivalents, accounts 
receivable, accounts payable, accrued compensation and  
other accrued liabilities, approximate fair value because of  
their short-term maturities. 

signiFicant cOncentratiOns 
Our customers are primarily pharmaceutical and biotechnology 
companies that are located in the U.S. and EU. Our accounts 
receivable balance contains billed and unbilled trade receivables 
from product sales and royalties, collaborative research agreements, 
and commercialization readiness revenue. We provide for an 
allowance for doubtful accounts by reserving for specifically 
identified doubtful accounts. We have not experienced significant 
credit losses from our accounts receivable or collaborative  
research agreements and none are expected. We perform a  
regular review of our customers’ payment histories and associated 
credit risk. We generally do not require collateral from our 
customers. At December 31, 2006, three different customers 
represented 56%, 15% and 14%, respectively, of our accounts 
receivable. At December 31, 2005, two customers represented 
48% and 10%, respectively, of our accounts receivable. 

We are dependent on our partners, vendors and contract 
manufacturers to provide raw materials, drugs and devices of 
appropriate quality and reliability and to meet applicable regulatory 
requirements. Consequently, in the event that supplies are delayed 
or interrupted for any reason, our ability to develop and produce our 
products could be impaired, which could have a material adverse 
effect on our business, financial condition and results of operation. 

cash, cash equivalents and investments 
We consider all investments in marketable securities with an  
original maturity of three months or less to be cash equivalents. 
Investments are designated as available-for-sale and are carried  
at fair value, with unrealized gains and losses reported in 
stockholders’ equity as accumulated other comprehensive  
income (loss). The disclosed fair value related to our investments  
is based primarily on the reported fair values in our period-end 
brokerage statements. We independently validate these fair values 
using available market quotes and other information. Investments 
with maturities greater than one year from the balance sheet date 
are classified as long-term. 

Interest and dividends on securities classified as available-for-sale, 
as well as amortization of premiums and accretion of discounts  
to maturity, are included in interest income. Realized gains and 
losses and declines in value of available-for-sale securities judged 
to be other-than-temporary, if any, are included in other income 
(expense). The cost of securities sold is based on the specific 
identification method. 

inventOries 
Inventories are computed on a first-in, first-out basis and stated  
net of reserves at the lower of cost or market. 

prOperty and equipment 
Property and equipment are stated at cost. Major improvements  
are capitalized, while maintenance and repairs are expensed  
when incurred. Manufacturing, laboratory and other equipment  
are depreciated using the straight-line method generally over 
estimated useful lives of three to seven years. Leasehold 
improvements and buildings are depreciated using the  
straight-line method over the shorter of the estimated useful  
life or the remaining term of the lease. 

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30

 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   
December 31, 2006 (continued)  

In accordance with SFAS No. 144, Accounting for the Impairment or 
Disposal of Long-Lived Assets, we periodically review our property 
and equipment for recoverability whenever events or changes  
in circumstances indicate that the carrying value may not be 
recoverable. Generally, an impairment loss would be recognized  
if the carrying amount of an asset exceeds the sum of the 
discounted cash flows expected to result from the use and  
eventual disposal of the asset. 

gOOdwill 
Goodwill represents the excess of the price paid for another  
entity over the fair value of the assets acquired and liabilities 
assumed in a business combination. We account for our goodwill 
asset in accordance with SFAS No. 142, Goodwill and Other 
Intangible Assets, and test for impairment as of October 1 each 
year, as well as at other times when impairment indicators exists  
or when events occur or circumstances change that would indicate 
the carrying amount may not be fully recoverable. For purposes of 
our annual impairment test, we have identified and assigned 
goodwill to two reporting units (as defined in SFAS No. 142) 
Pulmonary Technology and Advanced PEGylation Technology. 
Goodwill is tested for impairment at the reporting unit level  
using a two-step approach. The first step is to compare the fair 
value of a reporting unit’s net assets, including assigned goodwill,  
to the book value of its net assets, including assigned goodwill.  
If the fair value of the reporting unit is greater than its net book 
value, the assigned goodwill is not considered impaired. If the fair 
value is less than the reporting unit’s net book value, we perform  
a second step to measure the amount of the impairment, if any.  
The second step would be to compare the book value of the 
reporting unit’s assigned goodwill to the implied fair value of  
the reporting unit’s goodwill. At December 31, 2006, there  
were no indications of impairment. 

Other intangiBle assets 
Other intangible assets include proprietary technology, intellectual 
property, and supplier and customer relationships acquired from 
third parties or in business combinations. Other intangible assets 
with a finite useful life are amortized ratably over their estimated 
useful lives, which we currently estimate to be a period of five  
years. Once an intangible asset is fully amortized, we remove  
the gross costs and accumulated amortization from our 
Consolidated Balance Sheets. 

In accordance with SFAS No. 144, Accounting for the Impairment  
or Disposal of Long-Lived Assets, we periodically review our 
intangible assets for recoverability whenever events or changes  
in circumstances indicate that the carrying value may not be 
recoverable. Generally, an impairment loss would be recognized  
if the carrying amount of an intangible asset exceeds the sum of 
the discounted cash flows expected to result from the use and 
eventual disposal of the assets. 

revenue recOgnitiOn 
We recognize revenue in accordance with Securities and  
Exchange Commission Staff Accounting Bulletin No. 104,  
“Revenue Recognition in Financial Statements” (“SAB 104”) and 
Emerging Issues Task Force, Issue No. 00-21 (“EITF 00-21”), 
“Revenue Arrangements with Multiple Deliverables.” 

Revenue is recognized when there is persuasive evidence that an 
arrangement exists, delivery has occurred, the price is fixed and 
determinable, and collection is reasonably assured. Allowances are 
established for estimated sales returns and uncollectible amounts. 

Product Sales and Royalty Revenue 
Product revenues from Exubera Inhalation Powder and Inhalers are 
primarily derived from the cost-plus manufacturing and supply 
agreement with Pfizer, are subject to quarterly manufacturing 
variance adjustments, and are recognized at the earlier of 
acceptance of products by Pfizer or 60 days from shipment. 
Product revenues and the related cost of goods sold for products 
that were shipped to Pfizer but have not been recognized within  
60 days are recorded as deferred revenue, net of the deferred 
costs. To date, Pfizer has not returned any Exubera Inhalation 
Powder or Inhalers. 

Product revenues from our PEGylation Technology platform  
are primarily derived from cost-plus manufacturing and supply 
agreements with customers in our industry, and are recognized  
in accordance with the terms of the related contract. We have  
not experienced any significant returns from our customers. 

Generally, we are entitled to royalties from our customers based  
on their net sales. We recognize royalty revenue when the cash is 
received or when the royalty amount to be received is estimable and 
collection is reasonably assured. Royalties from the sale of Exubera 
Inhalation Powder and Exubera Inhalers were insignificant during 
the year ended December 31, 2006. 

Contract Research Revenue 
We enter into collaborative research and development 
arrangements with pharmaceutical and biotechnology partners that 
may involve multiple deliverables. Our arrangements may contain 
the following elements: upfront fees, collaborative research, 
milestone payments, manufacturing and supply, royalties and license 
fees. The principles and guidance outlined in EITF No. 00-21 
provide a framework to (a) determine whether an arrangement 
involving multiple deliverables contains more than one unit of 
accounting, and (b) determine how the arrangement consideration 
should be measured and allocated to the separate units of 
accounting in the arrangement. Significant judgment is required 
when determining the separate units of accounting and the fair 
value of individual deliverables. For each separate unit of accounting 
we have objective and reliable evidence of fair value using available 
internal evidence for the undelivered item(s) and our arrangements 
generally do not contain a general right of return relative to the 
delivered item. We use the residual method to allocate the 
arrangement consideration when it does not have fair value of  
a delivered item(s). Under the residual method, the amount of 
consideration allocated to the delivered item equals the total 
arrangement consideration less the aggregate fair value of the 
undelivered items. 

Contract research revenue from collaborative research and 
development agreements is recorded when earned based on the 
performance requirements of the contract. Advance payments for 
research and development revenue received in excess of amounts 
earned are classified as deferred revenue until earned. Amounts 
received under these arrangements are generally non-refundable 
even if the research effort is unsuccessful. 

32

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33

 
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

32

Payments received for milestones achieved are deferred and 
recorded as revenue ratably over the next period of continued 
development. Management makes its best estimate of the period of 
time until the next milestone is reached. This estimate affects the 
recognition of revenue for completion of the previous milestone. 
The original estimate is periodically evaluated to determine if 
circumstances have caused the estimate to change and if so, 
amortization of revenue is adjusted prospectively. Final milestone 
payments are recorded and recognized upon achieving the 
respective milestone, provided that collection is reasonably assured. 

Exubera Commercialization Readiness Revenue 
Exubera commercialization readiness revenue represents 
reimbursements from Pfizer, of certain agreed upon operating costs 
relating to our Exubera Inhalation Powder manufacturing facilities 
and our device contract manufacturing locations in preparation for 
commercial production, plus a markup on such costs. Exubera 
commercialization readiness costs are start up manufacturing costs 
we have incurred in our Exubera Inhalation Powder manufacturing 
facility and our Exubera Inhaler device contract manufacturing 
locations in preparation for commercial production. We do not 
anticipate incurring any additional costs related to commercialization 
readiness in connection with the ongoing commercial launch of 
Exubera, but will continue to recognize revenue and amortize the 
remaining commercialization readiness costs previously incurred in 
accordance with our reimbursement arrangement with Pfizer 
through October, 2007. 

shipping and handling cOsts 
We record costs related to shipping and handling of product to 
customers in cost of goods sold. 

stOck-Based cOmpensatiOn 
Stock-based compensation arrangements covered by SFAS No. 
123R currently include stock option grants and restricted stock unit 
(“RSU”) awards under our option plans and purchases of common 
stock by our employees at a discount to the market price under our 
Employee Stock Purchase Plan (“ESPP”). Stock compensation 
expense is recorded ratably over the vesting period of stock option 
or performance period of the RSU. Stock-based compensation 
expense for purchases under the ESPP are recognized based on 
the estimated fair value of the common stock during each offering 
period and the percentage of the purchase discount. 

Prior to January 1, 2006, we accounted for stock-based employee 
compensation plans using the intrinsic value method of accounting 
in accordance with APB Opinion No. 25 (“APB No. 25”), Accounting 
for Stock Issued to Employees, and related interpretations. Under 
the provisions of APB No. 25, no compensation expense was 
recognized with respect to employee purchases of our common 
stock under the ESPP or when stock options were granted with 
exercise prices equal to or greater than market value on the date  
of grant. However, for stock-based awards issued below the market 
price of our common stock on the grant date, we were required to 
record deferred compensation for this intrinsic value and expense 
this value ratably over the underlying vesting period. 

Effective January 1, 2006, we adopted the fair value method of 
accounting for stock-based compensation arrangements in 
accordance with SFAS No. 123R: Accounting for Share-Based 
Payment (“SFAS No. 123R”) using the modified prospective method 

of transition. Under the modified prospective method of  
transition, we are not required to restate our prior period financial 
statements to reflect expensing of stock-based compensation 
under SFAS No. 123R. Therefore, the results for the year ended 
December 31, 2006 are not directly comparable to the years  
ended December 31, 2005 and 2004. 

We use the Black-Scholes option valuation model adjusted for  
the estimated historical forfeiture rate for the respective grant  
to determine the estimated fair value of our stock-based 
compensation arrangements on the date of grant (“grant date fair 
value”) and expense this value ratably over the estimated life of the 
option or performance period of the RSU award. We have separated 
the employee population into two groups for valuation purposes, 
including forfeiture rates: (1) executive management and board 
members (executives) and (2) all other employees (staff). Expense 
amounts are allocated among cost of revenue, research and 
development expenses for drug discovery, and general and 
administrative expenses based on the function of the applicable 
employee. The Black-Scholes option pricing model requires the 
input of highly subjective assumptions. Because our employee  
stock options have characteristics significantly different from  
those of traded options, and because changes in the subjective 
input assumptions can materially affect the fair value estimate,  
in management’s opinion, the existing models may not provide  
a reliable single measure of the fair value of our employee stock 
options or common stock purchased under the ESPP. In addition, 
management will continue to assess the assumptions and 
methodologies used to calculate estimated fair value of stock-based 
compensation. Circumstances may change and additional data may 
become available over time, which could result in changes to these 
assumptions and methodologies, and which could materially impact 
our fair value determination. 

In November of 2005, the FASB issued FASB Staff Position  
FAS 123(R)-3, “Transition Election Related to Accounting for  
the Tax Effects of Share Base Payment Awards,” which allowed a 
one-time election to adopt one of two acceptable methodologies  
for calculating the initial additional paid-in capital pool (“APIC pool”). 
We elected the “short-cut” method to establish our APIC pool 
required under FAS 123(R) for the year ended December 31, 2006. 
In subsequent periods, the APIC pool will be increased by tax 
benefits from stock-based compensation and decreased by tax 
deficiencies caused when the recorded stock-based compensation 
for book purposes exceeds the allowable tax deduction. 

research and develOpment expense 
Research and development costs are expensed as incurred  
and include salaries, benefits and other operating costs such  
as outside services, supplies and allocated overhead costs.  
We perform research and development for our proprietary  
products and technology development and for others pursuant  
to collaboration agreements. For our proprietary products and  
our internal technology development programs, we invest our  
own funds without reimbursement from a third party. Costs 
associated with treatment phase of clinical trials are accrued based 
on the total estimated cost of the clinical trials and are expensed 
ratably based on patient enrollment in the trials. Costs associated 
with the start-up and reporting phases of the clinical trials are 
expensed as incurred. 

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33

 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   
December 31, 2006 (continued)  

Collaboration agreements typically include the development and 
licensing of our technology. Under these agreements, we may be 
reimbursed for development costs, entitled to milestone payments 
when and if certain development or regulatory milestones are 
achieved, compensated for the manufacture and supply of clinical 
and commercial product and entitled to royalties on sales of 
commercial product. All of our collaboration agreements are 
generally cancelable by the partner without significant financial 
penalty. Certain collaboration agreements may involve feasibility 
research which is designed to evaluate the applicability of our 
technologies to a particular molecule. Due to the nature of this 
research, we are reimbursed for the cost of work performed and  
our commitment is generally completed in less than one year. 

From time to time we acquire in-process research and development 
programs as part of strategic business acquisitions. Generally,  
in-process research and development purchased in a business 
combination is expensed on the acquisition date primarily because 
the acquired technology has not yet reached technological 
feasibility and has no future alternative use. In the year ended 
December 31, 2005, we recorded a charge of $7. million for  
in-process research and development costs in connection with  
our acquisition of Aerogen. 

net lOss per share 
Basic net loss per share is calculated based on the weighted-
average number of common shares outstanding during the periods 
presented. For all years presented in the Consolidated Statements 
of Operations, the net loss available to common shareholders is 
equal to the reported net loss. Basic and diluted net loss per share 
are the same due to our historical net losses and the requirement  
to exclude potentially dilutive securities which would have an  
anti-dilutive effect on net loss per share. These potentially dilutive 
securities have been excluded from the diluted net loss per share 
calculation and are as follows (in thousands): 

Convertible subordinated notes 
Stock options and restricted  
  stock units 
Warrants 
Convertible preferred stock 

Total 

December 31,

2006  

2005  

2004 

16,896   

16,86   

3,831 

7,049   
16   
—   

6,481   
36   
1,023   

5,862 
36
875 

23,961   

24,436    10,604

incOme taxes 
We account for income taxes under the liability method. Under this 
method, deferred tax assets and liabilities are determined based on 
differences between financial reporting and tax reporting bases of 
assets and liabilities and are measured using enacted tax rates and 
laws that are expected to be in effect when the differences are 
expected to reverse. Realization of deferred tax assets is dependent 
upon future earnings, the timing and amount of which are uncertain. 
Because of our lack of earnings history, our net deferred tax assets 
have been fully reserved. 

recent accOunting prOnOuncements 

sFas no. 157 
In September 2006, the FASB issued SFAS No. 157, Fair Value 
Measurements, which defines fair value, establishes a framework  
for measuring fair value in GAAP, and expands disclosures about 
fair value measurements. SFAS No. 157 does not require any new 
fair value measurements, but provides guidance on how to measure 
fair value by providing a fair value hierarchy used to classify the 
source of the information. This statement is effective beginning in 
October 2008. The Company is evaluating whether adoption of this 
statement will result in a change to its fair value measurements. 

saB 108 
In September 2006, the SEC issued SAB 108, Considering  
the Effects of Prior Year Misstatements when Quantifying 
Misstatements in Current Year Financial Statements. SAB 108 
requires analysis of misstatements using both an income statement 
(rollover approach) and a balance sheet (iron curtain) approach in 
assessing materiality and provides for a one-time cumulative effect 
transition adjustment. SAB 108 is effective for the Company’s  
fiscal year 2007 annual financial statements. We do not expect  
the application of the guidance to have a material impact on its 
consolidated results of operations, financial position or cash flows. 

sFas no. 123r 
In the first quarter of fiscal 2006, the Company adopted SFAS  
No. 123R, Share-Based Payment, and recognized stock-based 
compensation expense in our financial statements. Adoption of  
this statement had a material effect on our consolidated results of 
operations. However, adoption did not have a material effect on our 
financial position or cash flows. See Note 15 for a discussion of the 
impact on operating results for the year ended December 31, 2006. 

Fin 48 
In July 2006, the FASB issued Interpretation No. 48, “Accounting 
for Uncertainty in Income Taxes.” This interpretation, among other 
things, creates a two-step approach for evaluating uncertain tax 
positions. Recognition occurs when an enterprise concludes that  
a tax position, based on its technical merits, is more-likely-than-not 
to be sustained upon examination. Measurement determines the 
amount of benefit that more-likely-than-not will be realized upon 
ultimate settlement. De-recognition of a tax position that was 
previously recognized would occur when a company subsequently 
determines that a tax position no longer meets the more-likely-
than-not threshold of being sustained. FIN 48 specifically prohibits 
the use of a valuation allowance as a substitute for de-recognition 
of tax positions, and it has expanded disclosure requirements. FIN 
48 is effective for fiscal years beginning after December 15, 2006, 
in which the impact of adoption should be accounted for as a 
cumulative-effect adjustment to the beginning balance of retained 
earnings. We believe adoption of this pronouncement will not impact 
our financial position, results of operation or cash flows due to our 
history of net losses and fully reserved deferred tax assets, however 
we are still evaluating FIN 48 and has not yet determined the 
impact the adoption will have on the our tax disclosures in the 
Notes to the Consolidated Financial Statements. 

34

 
 
  
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

nOte 2—cash and cash equivalents, 
shOrt-term investments, and investments 
in marketaBle securities
Cash, cash equivalents and investments in marketable securities are as 
follows (in thousands): 

Estimated Fair Value
at December 31, 

nOte 3—inventOry 
Inventory consists of the following (in thousands): 

Raw material 
Work-in-process 
Finished goods 

2006 

2005 

Total 

$ 

December 31, 

2006 

2005 

8, 609  $  8,050
4,736   
2,740
1,311   
7,837 

$ 

14,656  $  18,627

Cash and cash equivalents 
Short-term investments  

$  63,760  $  261,273

(less than one year to maturity) 

  394,880    214,28

Long-term investments  

(one to two years to maturity) 

8,337   

0,222

Total Cash and Available-for-Sale Securities  $  466,977  $  566,423

Our portfolio of cash and available for sale debt securities includes  
(in thousands): 

U.S. corporate commercial paper 
Obligations of U.S. corporations 
Obligations of U.S. government agencies 
Repurchase agreements 
Obligations of non U.S. corporations 
Cash and other debt securities 

Estimated Fair Value
at December 31, 

2006 

2005 

$  234,512  $  17,57
  151,288    17,128
27,372    123,048
33,948   
64,1
—   
2,75
19,857   
17,476

Total Cash and Available-for-Sale Securities  $  466,977  $  566,423

Raw materials primarily include materials used in the production of 
our PEGylation products. Exubera Inhalers are manufactured and 
supplied by two of our contract manufacturers, then drop shipped  
to our customer. No inventory of Exubera Inhalers is held at Nektar. 
Reserves are determined using specific identification plus an 
estimated reserve against finished goods for potential defective or 
excess inventory based on historical experience or projected usage. 
Inventories are reflected net of reserves of $4.7 million and  
$3.1 million as of December 31, 2006 and 2005 respectively. 

nOte 4—prOperty and equipment 
Property and equipment consist of the following (in thousands): 

December 31, 

2006 

2005 

Building and leasehold improvements 
Laboratory equipment 
Manufacturing equipment 
Assets at contract manufacturer locations .   
Furniture, fixtures and other equipment 
Construction-in-progress 

$  118,574  $ 114,02 
41,116 
23,2 
23,750
1,115
6,05 

43,066   
23,406   
25,886   
20,970   
8,508   

At December 31, 2006 and 2005, the average portfolio duration 
was approximately four months, and the contractual maturity of any 
single investment did not exceed 24 months. 

Property and equipment at cost 

$  240,410  $  228,871

Less: accumulated depreciation 

(106,598)  

(86,744)

Property and equipment, net 

$  133,812  $  142,127

Gross unrealized gains on the portfolio were nil as of both 
December 31, 2006 and 2005. Gross unrealized losses  
on the portfolio were $ 0.5 million and $ 2.0 million as of  
December 31, 2006 and 2005, respectively. We have a history  
of holding our investments to maturity. Additionally, we have  
the ability and intent to hold our debt securities to maturity when 
they will be redeemed at full par value. Accordingly, management 
considers these unrealized losses to be temporary and has not 
recorded a provision for impairment. 

At December 31, 2006 and 2005, we had letter of credit 
arrangements with certain financial institutions and vendors, 
including our landlord, totaling $2.6 million. These letters of  
credit are secured by investments in similar amounts. 

Building and leasehold improvements include our commercial 
manufacturing, clinical manufacturing, research and development 
and administrative facilities and the related improvements to  
these facilities. Laboratory and manufacturing equipment primarily 
includes assets that support both our manufacturing and research 
and development efforts. Assets at contract manufacturer locations 
are automated assembly line equipment used in the manufacture of 
the inhaler device for Exubera. 

Construction-in-progress includes assets being built to enhance our 
commercial manufacturing operations and with automated assembly 
line equipment located at our contract manufacturers’ sites. As a 
result of a contract renegotiation with one of our collaboration 
partners in the fourth quarter of 2006, we determined that one of 
our construction-in-progress assets would no longer be completed 
and we recorded an impairment loss for the costs incurred to date 
of $2.7 million. Additionally, as a result of our decision to wind down 
Bradford, UK operations, we determined that certain laboratory and 
office equipment had no remaining useful life. Consequently, we 
recorded impairment charges of $1.2 million and $5.7 million for 
the years ended December 31, 2006 and 2005, respectively.  

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35

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   
December 31, 2006 (continued)  

These charges are reflected in the Impairment of Long-lived  
Assets line item in our Consolidated Statements of Operations.  
See Note 13 for more information regarding the wind down  
of the Bradford operations. 

Depreciation expense for the years ended December 31, 2006, 
2005 and 2004 was $26.8 million, $1.2 million and  
$12.6 million, respectively. 

nOte 5—gOOdwill and Other  
intangiBle assets 

goodwill  
As of December 31, 2006 and 2005, carrying value of our goodwill 
was $78.4 million, which for purposes of our periodic impairment 
evaluations, $6.0 million is assigned to our PEGylation Technology 
reporting unit and $.4 million is assigned to our Pulmonary 
Technology reporting unit. 

In the fourth quarter of 2006, we performed our annual  
impairment test for goodwill and determined there was no  
indication of impairment. 

In December 2005, we were apprised of unfavorable results at  
our Bradford, UK facility and certain clinical data related to those 
activities. We re-performed our annual impairment test of the 
goodwill assigned to the super critical fluids reporting unit. We 
determined the fair value of the Super Critical Fluids reporting  
unit, based on a discounted cash flow analysis, was less than the 
carrying amount of the reporting units assets, including assigned 
goodwill. Consequently, we recorded an impairment charge of  
$5.6 million in the year ended December 31, 2005. This charge  
is reflected in the Impairment of Long-lived Assets line item in our 
Consolidated Statements of Operations. See Note 13 for more 
information regarding the winding down of the Bradford facility. 

Other intangible assets
Other intangible assets are comprised of the following (in thousands except useful lives): 

December 31, 2006  

December 31, 2005   

useful 

Gross 

life in years  carrying amount 

accumulated 
amortization 

Net 

Gross 
Carrying Amount 

Accumulated
Amortization   

Core technology 
Developed product technology 
Intellectual property 
Supplier and customer relations 

Total 

5 
5 
5–7 
5 

$ 

— 
— 
— 
  4,730 

$ 

— 
— 
— 
(1,104) 

$ 

—   $  15,270  $ 
— 
— 
  3,626 

2,00 
7,301 
,870 

(7,52) 
(2,610) 
(6,77) 
(4,71) 

$  4,730 

$  (1,104) 

$  3,626 

$  35,341  $  (21,88) 

$  13,452

Net 

$  7,741
20
522
4,8

Amortization expense related to other intangible assets totaled  
$4.3 million, $4. million and $4.5 million for the years ended 
December 31, 2006, 2005, and 2004, respectively. 

During the second half of 2006, we began a process of evaluating 
business activities outside our focus areas of Pulmonary Technology 
and PEGylation Technology. In late December 2006, we entered 
into a non-binding letter of intent to sell our nebulizer device 
business. We determined that the non-binding letter of intent to sell 
the nebulizer device business, coupled with our general efforts to 
focus on core technologies, were indicators that our intangible 
asset related to these products acquired from the 2005 Aerogen 

acquisition does not have future value. After reassessing the 
remaining useful life of this intangible asset and evaluating the 
historical net losses from the nebulizer device business, we 
determined the intangible asset was fully impaired and recorded  
a $5.5 million charge for the year ended December 31, 2006.  
This charge is reflected in the Impairment of Long-lived Assets  
line item in our Consolidated Statements of Operations. 

Future amortization expense of our existing supplier and customer 
relations intangible asset is approximately $0. million per year until 
October 2010, when it will be fully amortized. 

36

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

nOte 6—cOnvertiBle suBOrdinated nOtes 
The outstanding balance of our convertible subordinated notes is as follows (in thousands): 

5% Notes due February 2007 

3.5% Notes due October 2007 

3.25% Notes due September 2012 

Total outstanding convertible subordinated notes 

Less: current portion 

Convertible subordinated notes 

Our convertible subordinated notes are unsecured and 
subordinated in right of payment to our future senior debt.  
The carrying value approximates fair value for both periods 
presented. Costs related to the issuance of these convertible  
notes are recorded in Other Assets in our Consolidated Balance 
Sheets and are amortized to interest expense on a straight-line 
basis over the contractual life of the notes. The unamortized 
deferred financing costs were $7.3 million and $.7 million for  
the years ended December 31, 2006 and 2005, respectively. 

conversion 
The notes are convertible at the option of the holder at any time  
on or prior to maturity into shares of our common stock. The  
3.25% Notes have a conversion rate of 46.4727 shares per  
$1,000 principal amount, which is equal to a conversion price of 
approximately $21.52. Additionally, at any time prior to maturity,  
if a fundamental change as defined in the 3.25% subordinated  
debt indenture occurs, we may be required to pay a make-whole 
premium on notes converted in connection therewith by increasing 
the conversion rate applicable to the notes. The amount of the 
make-whole premium will be determined in accordance with a  
table showing the make-whole premium that would apply at various 
common stock prices and fundamental change effective dates. 

The 3.5% Notes have a conversion rate of 1.8177, which is equal 
to a conversion price of $ 50.46 per share. 

The 5% Notes were repaid in full on February 7, 2007 and are, 
therefore, no longer subject to conversion or redemption. 

Semi-Annual 
Interest  
Payment Dates 

August 8,  
February 8 

April 17,  
October 17 

March 28, 
September 28 

December 31,

2006 

2005

$ 

36,026 

$  36,026

66,627 

66,627

315,000 

315,000

$ 

417,653 

$  417,653

(102,653) 

—

$ 

315,000 

$  417,653

redemption 
Beginning on September 28, 2008, we may redeem the 3.25% 
Notes in whole or in part for cash at a redemption price equal to 
100% of the principal amount of the 3.25% Notes plus any accrued 
but unpaid interest if the closing price of the common stock has 
exceeded 150% of the conversion price of the 3.25% notes for at 
least 20 days in any consecutive 30 day trading period. 

The 3.5% Notes are also redeemable in whole or in part at any  
time, at certain redemption prices dependent upon the date of 
redemption if the closing price of our Common Stock has exceeded 
120% of the conversion price then in effect for at least 20 trading 
days within a period of 30 consecutive trading days. 

loss on early extinguishment  
of convertible subordinated notes 
In September 2005, we retired $25.4 million and $45. million 
aggregate principal amount of our outstanding 5% Notes  
and 3.5% Notes, respectively, in cash, in privately negotiated 
transactions. As a result of the transactions, we recognized losses 
related to the early extinguishment of approximately $0.3 million.

In January 2004, certain holders of our outstanding 3.5%  
Notes completed an exchange and cancellation of $.0 million  
in aggregate principal amount of the notes for the issuance of  
0.6 million shares of our common stock in a privately negotiated 
transaction. In February 2004, certain holders of our outstanding 
3% Notes, in privately negotiated transactions, converted 
approximately $36.0 million in aggregate principal amount of such 
notes for approximately $3.2 million shares of our common stock 
and a cash payment of approximately $3.1 million. As a result of 
these transactions, we recognized losses on debt extinguishment  
of approximately $7.8 million and $1.5 million, respectively.

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37

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   
December 31, 2006 (continued)  

nOte 7—capital leases 
We lease one of the buildings in our San Carlos facility under a 
capital lease arrangement that resulted from a sale-leaseback 
transaction completed in 2004. In accordance with SFAS No. 13, 
Accounting for Leases, we evaluated the lease at inception and 
accounted for it as a capital lease by recording a capital lease  
asset and capital lease obligation equal to the fair market value  
of approximately $25.5 million. It has a current gross carrying  
value of $21.2 million. Accumulated amortization of the building 
under the lease was approximately $4.1 million and $2.3 million  
as of December 31, 2006 and 2005, respectively. The outstanding 
capital lease obligation was $20.3 million and $20.8 million as  
of December 31, 2006 and 2005, respectively, which represents 
the present value of future minimum payments on the lease.  
Under the terms of the lease, the rent will escalate 2% in October 
of each year until the lease expires in September 2016. 

Additionally, we lease certain office equipment under another  
capital lease. 

Future minimum payments for the two capital leases at  
December 31, 2006 are as follows (in thousands): 

Years ending December 31,

  2007 
  2008 
  200 
  2010 
  2011 
  2012 and thereafter 

Total minimum payments required 
Less: amount representing interest 

Present value of future payments 
Less: current portion 

Non-current portion 

$  3,2
4,071
4,12
4,146
4,230
  21,266

$  41,834
  21,364

$  20,470
711

$  1,75

The 2004 sale-leaseback transaction qualified for sales treatment 
under SFAS No. 8, Accounting for Leases and we recorded a 
deferred gain of $12.7 million which is reflected in Other Liabilities. 
This amount is being amortized over the term of the lease as a 
reduction of depreciation expense. During the years ended 
December 31, 2006, 2005 and 2004, we amortized a gain of  
$0. million, $0. million and $0.5 million, respectively. 

nOte 8—litigatiOn settlement 
On June 30, 2006, we, our subsidiary Nektar AL, and a former 
officer, Milton Harris, entered into a Settlement Agreement and 
General Release with the University of Alabama Huntsville (UAH) 
related to an intellectual property dispute. Under the terms of the 
Settlement Agreement, the Company, Nektar AL, Mr. Harris and 
UAH agreed to full and complete satisfaction of all claims asserted 
in the litigation in exchange for $25 million in cash payments.  
We and Mr. Harris made an initial payment of $15.0 million on  
June 30, 2006, of which we paid $11.0 million and Mr. Harris paid 
$4.0 million. Beginning July 1, 2007, we will pay UAH 10 annual 
installment payments of $1.0 million each, representing an accrued 
liability of $7.0 million at December 31, 2006, or the present value 
of the future payments using an 8% annual discount rate. We 
recorded a litigation settlement charge of $17.7 million during the 
year ended December 31, 2006 which reflects the net present 
value of the settlement payments. 

nOte 9—cOmmitments and cOntingencies 

Operating leases 
We lease certain facilities under arrangements expiring through 
June 2012. Rent expense for operating leases was approximately 
$4.1 million, $3.1 million, and $3.0 million for the years ended 
December 31, 2006, 2005 and 2004, respectively. 

Future minimum lease payments under non-cancelable operating 
leases as of December 31, 2006, are as follows (in thousands):  

Years ending December 31,

  2007 
  2008 
  200 
  2010 
  2011 
  2012 and thereafter 

Total minimum payments required 

$  3,770
  3,704
  2,28
  2,836
  2,05
  1,452

$  17,55

We have several leases for our facilities in multiple locations.  
In the event that we do not exercise our option to extend the  
term of the lease of our San Carlos manufacturing facility, we are 
required to restore the property to certain conditions in place at the 
time of lease. We believe these costs would not be material to our 
operations. As a result of terminating our research and development 
efforts in the UK, we recorded a $1.0 million expense in the year 
ended December 31, 2006, related to the lease restoration of our 
Bradford facilities. 

38

 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

legal matters 
On August 1, 2006, Novo Nordisk filed a lawsuit against Pfizer  
in federal court claiming that Pfizer willfully infringes on Novo’s 
patents covering inhaled insulin with Exubera. The case is currently 
proceeding with discovery and other pre-trial activities. Although  
we are not currently a named party in this litigation, we have 
incurred litigation costs as a result of such litigation and may  
incur substantial future costs and potential indemnity claims from  
Pfizer associated with the litigation. These and other disputes may 
have a material impact on our business, results of operation and 
financial condition. 

From time to time, we may be involved in lawsuits, claims, 
investigations and proceedings, consisting of intellectual property, 
commercial, employment and other matters, which arise in the 
ordinary course of business. In accordance with the SFAS No. 5, 
Accounting for Contingencies, we make a provision for a liability 
when it is both probable that a liability has been incurred and the 
amount of the loss can be reasonably estimated. These provisions 
are reviewed at least quarterly and adjusted to reflect the impact of 
negotiations, settlements, ruling, advice of legal counsel, and other 
information and events pertaining to a particular case. Litigation is 
inherently unpredictable. If any unfavorable ruling were to occur in 
any specific period, there exists the possibility of a material adverse 
impact on the results of operations of that period or on our cash 
flows and liquidity. 

workers’ compensation 
Pursuant to the terms of our workers’ compensation insurance 
policy, we were subject to self-fund all claims up to $250,000  
per occurrence subject to a maximum of $50,000 for the  
term of the insurance policy, through October 31, 2006. As of 
November 1, 2006, we began a fully funded workers compensation 
insurance policy. Historically, we have not been obligated to make 
significant payments for these obligations, and no significant 
liabilities have been recorded for these obligations on our balance 
sheet as of December 31, 2006 or 2005. 

royalties 
We have certain royalty commitments associated with the shipment 
and licensing of certain products. Royalty expense, which is 
reflected in Cost of Goods Sold in our Consolidated Statements  
of Operations, was approximately $5.5 million, $3.5 million, and 
$2.0 million for the years ended December 31, 2006, 2005, and 
2004, respectively. The overall maximum amount of the obligations 
is based upon sales of the applicable product and cannot be 
reasonably estimated. 

security agreement with pfizer inc. 
In connection with the Collaboration, Development and License 
Agreement (“CDLA”) dated January 18, 15, that we entered  
into with Pfizer Inc. for the development of the Exubera product,  
we entered into a Security Agreement pursuant to which our 
obligations under the CDLA and certain Manufacturing and Supply 
Agreements related to the manufacture and supply of powdered 
insulin and pulmonary inhaler devices for the delivery of powdered 
insulin, are secured. Our default under any of these agreements 
triggers Pfizer rights with respect to property relating solely to,  
or used or which will be used solely in connection with, the 
development, manufacture, use and sale of Exubera including 
proceeds from the sale or other disposition of the property.  
Because the obligated amount of this agreement is not explicitly 
stated, the overall maximum amount of the obligations cannot be 
reasonably estimated. Historically, we have not been obligated to 
make significant payments for these obligations, and no liabilities 
have been recorded for these obligations on our balance sheet as 
of December 31, 2006, 2005 or 2004. 

collaboration agreements for pulmonary products 
As part of our collaboration agreements with our partners for the 
development, manufacture and supply of products based on our 
Pulmonary Technology, we generally agree to defend, indemnify  
and hold harmless our partners from and against third party 
liabilities arising out of the agreement, including product liability  
and infringement of intellectual property. The term of these 
indemnification obligations is generally perpetual any time after 
execution of the agreement. There is no limitation on the potential 
amount of future payments we could be required to make under 
these indemnification obligations. 

To date we have not incurred costs to defend lawsuits or settle 
claims related to these indemnification obligations. If any of our 
indemnification obligations is triggered, we may incur substantial 
liabilities. Because the obligated amount under these agreements  
is not explicitly stated, the overall maximum amount of the 
obligations cannot be reasonably estimated. No liabilities have  
been recorded for these obligations on our balance sheet as of 
December 31, 2006 or 2005. 

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3

 
 
 
 
 
 
 
notes To consolidated Financial Statements   
December 31, 2006 (continued)  

license, manufacturing and supply agreements 
for products Based on our pegylation technology 
As part of our license, manufacturing and supply agreements with 
our partners for the development or manufacture and supply of 
PEG reagents based on our PEGylation Technology, we generally 
agree to defend, indemnify and hold harmless our partners from  
and against third party liabilities arising out of the agreement, 
including product liability and infringement of intellectual property. 
The term of these indemnification obligations is generally perpetual 
any time after execution of the agreement. There is no limitation  
on the potential amount of future payments we could be required  
to make under these indemnification obligations. We have never 
incurred costs to defend lawsuits or settle claims related to these 
indemnification obligations. If any of our indemnification obligations 
is triggered, we may incur substantial liabilities. Because the 
obligated amount of this agreement is not explicitly stated, the 
overall maximum amount of the obligations cannot be reasonably 
estimated. Historically, we have not been obligated to make 
significant payments for these obligations, and no liabilities have 
been recorded for these obligations in our Consolidated Balance 
Sheets as of December 31, 2006, 2005 or 2004.

indemnification of Our contract manufacturers 
We have a Manufacturing and Supply Agreement with our contract 
manufacturers to provide for the manufacturing of Exubera Inhalers. 
We have agreed to defend, indemnify, and hold harmless the 
contract manufacturers from and against third party liability arising 
out of the agreement, including product liability and infringement  
of intellectual property. There is no limitation on the potential 
amount of future payments we could be required to make under 
these indemnification obligations. We have never incurred costs  
to defend lawsuits or settle claims related to these indemnification 
obligations. If any of our indemnification obligations is triggered, we 
may incur substantial liabilities. Because the obligated amount of 
this agreement is not explicitly stated, the overall maximum amount 
of the obligations cannot be reasonably estimated. 

indemnification of underwriters and  
initial purchasers of Our securities 
In connection with our sale of equity and convertible debt securities 
from, we have agreed to defend, indemnify and hold harmless our 
underwriters or initial purchasers, as applicable, as well as certain 
related parties from and against certain liabilities, including liabilities 
under the Securities Act of 133, as amended. The term of these 
indemnification obligations is generally perpetual. There is no 
limitation on the potential amount of future payments we could be 
required to make under these indemnification obligations. We have 
never incurred costs to defend lawsuits or settle claims related to 
these indemnification obligations. If any of our indemnification 
obligations are triggered, however, we may incur substantial 
liabilities. Because the obligated amount of this agreement is not 
explicitly stated, the overall maximum amount of the obligations 
cannot be reasonably estimated. Historically, we have not been 
obligated to make significant payments for these obligations, and 
no liabilities have been recorded for these obligations in our 
Consolidated Balance Sheets as of December 31, 2006,  
2005 or 2004. 

director and Officer indemnifications 
As permitted under Delaware law, and as set forth in our  
Certificate of Incorporation and our Bylaws, we indemnify our 
directors, executive officers, other officers, employees, and other 
agents for certain events or occurrences that arose while in such 
capacity. The maximum potential amount of future payments we 
could be required to make under this indemnification is unlimited; 
however, we have insurance policies that may limit our exposure 
and may enable us to recover a portion of any future amounts  
paid. Assuming the applicability of coverage, the willingness of the 
insurer to assume coverage, and subject to certain retention, loss 
limits and other policy provisions, we believe any obligations under 
this indemnification are not material, other than an initial $500,000 
per incident retention deductible per our insurance policy. However, 
no assurances can be given that the covering insurers will not 
attempt to dispute the validity, applicability, or amount of coverage 
without expensive litigation against these insurers, in which case we 
may incur substantial liabilities as a result of these indemnification 
obligations. Because the obligated amount of this agreement is  
not explicitly stated, the overall maximum amount of the obligations 
cannot be reasonably estimated. Historically, we have not been 
obligated to make significant payments for these obligations,  
and no liabilities have been recorded for these obligations in  
our Consolidated Balance Sheets as of December 31, 2006,  
2005 or 2004. 

nOte 10—stOckhOlders’ equity 

preferred stock 
We have authorized 10,000,000 shares of Preferred Stock, each 
share having a par value of $0.0001. Three million one hundred 
thousand (3,100,000) shares of Preferred Stock are designated 
Series A Junior Participating Preferred Stock (the “Series A 
Preferred Stock”). We had designated 40,000 shares of  
Preferred Stock as Series B Convertible Preferred Stock,  
however, on January 7, 2006, the remaining outstanding shares 
automatically converted to common stock. We have no preferred 
shares issued and outstanding as of December 31, 2006. 

series a preferred stock 
On June 1, 2001, the Board of Directors approved the adoption  
of a Share Purchase Rights Plan. Terms of the Rights Plan provide 
for a dividend distribution of one preferred share purchase right  
for each outstanding share of our Common Stock. The Rights have 
certain anti-takeover effects and will cause substantial dilution to a 
person or group that attempts to acquire us on terms not approved 
by our Board of Directors. The dividend distribution was payable  
on June 22, 2001, to the stockholders of record on that date.  
Each Right entitles the registered holder to purchase from us one 
one-hundredth of a share of Series A Preferred Stock at a price of 
$225.00 per one one-hundredth of a share of Series A Preferred 
Stock, subject to adjustment. Each one one-hundredth of a share of 
Series A Preferred Stock has designations and powers, preferences 
and rights, and the qualifications, limitations and restrictions which 
make its value approximately equal to the value of a share of 
Common Share. 

40

notes To consolidated Financial Statements   

December 31, 2006 (continued)  

The Rights are not exercisable until the Distribution Date (as 
defined in the Certificate of Designation for the Series A Preferred 
Stock). The Rights will expire on June 1, 2011, unless the Rights 
are earlier redeemed or exchanged by us. Each share of Series A 
Preferred Stock will be entitled to a minimum preferential quarterly 
dividend payment of $1.00 but will be entitled to an aggregate 
dividend of 100 times the dividend declared per share of Common 
Stock. In the event of liquidation, the holders of the Series A 
Preferred Stock would be entitled to a minimum preferential 
liquidation payment of $100 per share, but would be entitled to 
receive an aggregate payment equal to 100 times the payment 
made per Common Share. Each share of Series A Preferred Stock 
will have 100 votes, voting together with the Common Stock. Finally, 
in the event of any merger, consolidation or other transaction in 
which our Common Stock is exchanged, each share of Series A 
Preferred Stock will be entitled to receive 100 times the amount  
of consideration received per share of Common Stock. Because of 
the nature of the Series A Preferred Stock dividend and liquidation 
rights, the value of one one-hundredth of a share of Series A 
Preferred Stock should approximate the value of one share of 
Common Stock. The Series A Preferred Stock would rank junior to 
any other future series of preferred stock. Until a Right is exercised, 
the holder thereof, as such, will have no rights as a stockholder, 
including, without limitation, the right to vote or to receive dividends. 

series B convertible preferred stock 
In connection with a strategic alliance with Enzon Pharmaceuticals, 
Inc., we entered into a Preferred Stock Purchase Agreement 
pursuant to which Enzon purchased 40,000 shares of non-voting 
Series B Preferred Stock at a purchase price of one thousand 
dollars ($1,000) per share for an aggregate purchase price of 
$40.0 million. The Series B Preferred Stock was convertible into  
a number of Common Shares equal to the quotient of $1,000  
per share divided by the conversion price which was initially  
$22.7 per share. In 2004, Enzon converted 20,000 Series B 
Preferred Stock into 880,000 Common Shares and on  
January 7, 2006, the remaining 20,000 automatically  
converted into 1,023,000 Common Shares. 

issuance of common stock 
On August 15, 2005, we entered into a Common Stock Purchase 
Agreement with Mainfield Enterprises Inc. pursuant to which we 
sold approximately 1. million shares of our common stock at an 
average price of $16.3 per common share for proceeds of 
approximately $31.6 million, net of issuance costs. 

In March 2004, we entered into an underwriting agreement with 
Lehman Brothers Inc. pursuant to which we sold .5 million shares 
of our common stock at a price of $20.71 per common share for 
proceeds of approximately $16.4 million, net of issuance costs. 

During the first half of 2004, certain outstanding convertible 
subordinated notes with an aggregate principal amount of 
approximately $186.0 million were converted into 16.0 million 
shares of common stock. These conversions resulted in a  
$11.3 million increase to additional paid in capital. 

employee stock purchase plan 
In February 14, our Board of Directors adopted the ESPP, 
pursuant to section 423(b) of the Internal Revenue Code of 186. 
Under the ESPP, 800,000 shares of common stock have been 
authorized for issuance. The terms of the ESPP provide eligible 
employees with the opportunity to acquire an ownership interest  
in Nektar through participation in a program of periodic payroll 
deductions for the purchase of our common stock. Employees must 
make an election to enroll or re-enroll in the plan on a semi-annual 
basis. Stock is purchased at 85% of the lower of the closing price 
on the first day of the enrollment period or the last day of the 
enrollment period. 

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notes To consolidated Financial Statements   
December 31, 2006 (continued)  

stock Option plans 
The following table summarizes information with respect to shares of our common stock that may be issued under our existing equity 
compensation plans as of December 31, 2006 (share number in thousands): 

Plan Category 

Equity compensation plans approved  
  by security holders 2 
Equity compensation plans not approved 
  by security holders 

Total 

Number of securities to be 
issued upon exercise of 
outstanding options  
(a)1 

Weighted-average 
exercise price of 
outstanding options 
(b) 

Number of securities remaining
available for issuance under
equity compensation plans
[excluding securities reflected 
In column (a)]
(c) 

3,821 

7,765 

11,586 

$  1.53 

$  18.6 

$  18.7 

7,1

1,337

,256

1   Does not include options to purchase 3,200 shares assumed in connection with the acquisition of Bradford Particle Design Ltd (with a weighted-average exercise price of 
$7.00 per share) and options to purchase 73,000 shares we assumed in connection with the acquisition of Shearwater Corporation (with a weighted-average exercise 
price of $0.03 per share). 

2  Includes 316,639 shares of common stock available for future issuance under our ESPP as of December 31, 2006. 

2000 equity incentive plan 
Our 14 Equity Incentive Plan was adopted by the Board of 
Directors on February 10, 14, and was amended and restated  
in its entirety and renamed the “2000 Equity Incentive Plan” on  
April 1, 2000. The purpose of the 2000 Equity Incentive Plan  
is to attract and retain qualified personnel, to provide additional 
incentives to our employees, officers, consultants and employee 
directors and to promote the success of our business. Pursuant to 
the 2000 Equity Incentive Plan, we may grant or issue incentive 
stock options to employees and officers and non-qualified stock 
options, rights to acquire restricted stock, restricted stock units,  
and stock bonuses to consultants, employees, officers and  
non-employee directors. 

The maximum term of a stock option under the 2000 Equity 
Incentive Plan is 10 years, but if the optionee at the time of grant 
has voting power of more than 10% of our outstanding capital 
stock, the maximum term of an incentive stock option is five years. 
The exercise price of incentive stock options granted under the 
2000 Equity Incentive Plan must be at least equal to 100% (or 
110% with respect to holders of more than 10% of the voting 
power of our outstanding capital stock) of the fair market value  
of the stock subject to the option on the date of the grant. The 
exercise price of non-qualified stock options and the purchase  
price of rights to acquire restricted stock and restricted stock units 
granted under the 2000 Equity Incentive Plan are determined by 
the Board of Directors. 

The Board may amend the 2000 Equity Incentive Plan at any time, 
although certain amendments would require stockholder approval. 
The 2000 Equity Incentive Plan will terminate on February , 2010, 
unless earlier terminated by the Board. On June 1, 2006, our 
stockholders approved an amendment to the 2000 Equity Incentive 

Plan to (i) provide that we will not effect a “repricing” of a  
stock award under the 2000 Equity Incentive Plan without prior 
stockholder approval (subject to certain exceptions) and (ii) increase 
the number of shares of Common Stock authorized for issuance 
under the Purchase Plan to a total of 18,250,000 shares. 

2000 non-Officer equity incentive plan 
Our 18 Non-Officer Equity Incentive Plan was adopted by the 
Board of Directors on August 18, 18, and was amended and 
restated in its entirety and renamed the “2000 Non-officer Equity 
Incentive Plan” on June 6, 2000 (the “2000 Plan”). The purpose of 
the 2000 Plan is to attract and retain qualified personnel, to provide 
additional incentives to employees and consultants and to promote 
the success of our business. Pursuant to the 2000 plan, we may 
grant or issue non-qualified stock options, rights to acquire 
restricted stock and stock bonuses to employees and consultants 
who are neither Officers nor Directors of Nektar. The maximum 
term of a stock option under the 2000 Plan is 10 years.  
The exercise price of stock options and the purchase price of  
restricted stock granted under the 2000 Plan are determined  
by the Board of Directors. 

non-employee directors’ stock Option plan 
On February 10, 14, our Board of Directors adopted the  
Non-Employee Directors’ Stock Option Plan under which options to 
purchase up to 400,000 shares of our Common Stock at the then 
fair market value may be granted to our non-employee directors. 
There are no remaining options available for grant under this plan 
as of December 31, 2006. 

42

    
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

restricted stock units 
During the years ended December 31, 2006, 2005 and 2004,  
we issued RSUs to certain officers, non-employees, directors, 
employees and consultants. RSUs are similar to restricted stock  
in that they are issued for no consideration; however, the holder 
generally is not entitled to the underlying shares of common stock 
until the RSU vests. Also, because the RSUs are issued for $0.01, 
the grant-date fair value of the award is equal to its intrinsic value 
on the date of grant. The RSUs were issued under both the 2000 
Equity Incentive Plan and the 2000 Non-Officer Equity Incentive 
Plan and are settled by delivery of shares of our common stock on 
or shortly after the date the awards vest. A significant portion of the 
2006 RSUs vest upon the achievement of certain performance-
based milestones, however, the RSUs issued in 2005 and 2004 are 
service based awards and vest based on the passage of time. At 
December 31, 2006, certain of these awards are expected to vest 
upon achievement of three performance-based milestones which 
are expected to occur over a 5 to 33 month period. Beginning with 
shares granted in the year ended December 31, 2005, each RSU 
depletes the pool of options available for grant by a ratio of 1:1.5. 

time accelerated restricted stock award plan 
(“tarsap”) 
During the year ended December 31, 2004, we issued options  
for 111,000 shares of stock under our 2000 Non-Officer Equity 
Incentive Plan to certain employees subject to vesting upon FDA 
approval of Exubera. The options had an exercise price equal to fair 
market value on the date of grant. These options vested upon the 
approval of Exubera by the FDA in January 2006. 

warrants 
In November 16, we issued warrants to purchase a total of 
40,000 shares of common stock in connection with a tenant 
improvement loan for one of our facilities. The warrants had an 
exercise price of $6.56 per share and expired after 10 years.  
The warrants allowed for net share settlement at the option of  
the warrant holder and were accounted for as equity in accordance  
with EITF Issue No. 6-18 (“EITF 6-18”) Accounting for Equity 
Instruments That Are Issued to Other Than Employees for Acquiring, 
or in Conjunction with Selling, Goods or Services. The warrants  
were valued using a Black-Scholes option valuation model with  
the following weighted-average assumptions: risk free interest  
rate of 6.4%; dividend yield of 0.0%; volatility factor of 62%; and  
a weighted average expected life of ten years. In November 2004, 
one of the warrants representing 20,000 shares of common stock 
was exercised in the form of a net share settlement for 11,775 
shares of common stock. In August 2006, the remaining warrant 
representing 20,000 shares of common stock was exercised in the 
form of a net share settlement for 12,087 shares of common stock. 
Expense related to these warrants was insignificant for the years 
ended December 31, 2006, 2005 and 2004. 

In September 2000, we issued warrants to purchase 10,000  
shares of common stock to the landlord of one of our facilities in 
connection with the signing of a capital lease on that facility. In 
November 2000, we issued warrants to certain consultants to 
purchase an additional 6,000 shares of common stock. These 
warrants were accounted for as equity in accordance with EITF  
6–18 and were valued using a Black-Scholes option valuation 

model with the following weighted-average assumptions: a risk  
free interest rate of 6.4%; a dividend yield of 0.0%; a volatility  
factor of 68.8%; and a weighted average expected life of  
10 years. Both warrants had an exercise price of $45.88 per  
share with a six year life, and both expired unexercised in 
September and November 2006, respectively. No warrants to 
purchase common shares were outstanding at December 31, 2006. 
Expense related to these warrants was insignificant for the years 
ended December 31, 2006, 2005 and 2004. 

401(k) retirement plan 
We sponsor a 401(k) retirement plan whereby eligible employees 
may elect to contribute up to the lesser of 60% of their annual 
compensation or the statutorily prescribed annual limit allowable 
under Internal Revenue Service regulations. The 401(k) plan 
permits us to make matching contributions on behalf of all 
participants. Currently, we match the lesser of 75% of year to  
date participant contributions or 3% of eligible wages. The match 
vests ratably over the first three years of employment, such that 
after three years of employment, all matching is fully vested. The 
matching contribution is in the form of shares of our common stock. 

We issued approximately 103,000 shares, 87,000 shares, and 
66,000 shares of our common stock valued at approximately  
$1.8 million, $1.4 million, and $1.2 million in connection with the 
match in 2006, 2005 and 2004, respectively. During part of 2004, 
shares reserved for issuance related to matching contributions  
that had been previously been approved by our Board of Directors 
became fully depleted. During this time, we purchased approximately 
14,000 shares on the open market on behalf of employees  
for a total cost of $0.2 million and recorded this amount as 
compensation expense during the period. During the year  
ended December 31, 2004, our Board of Directors approved  
an additional 300,000 shares to be reserved for issuance related  
to matching contributions. 

change in control severance plan 
On December 6, 2006, the Board of Directors approved a  
Change of Control Severance Benefit Plan (the “CIC Plan”) and on 
February 14, 2007 the Board of Directors amended and restated 
the CIC Plan. The CIC Plan is designed to make certain benefits 
available to eligible employees of the Company in the event of  
a change of control of the Company and, following such change  
of control, an employee’s employment with the Company or 
successor company is terminated in certain specified circumstances. 
The Company adopted the CIC Plan to support the continuity of the 
business in the context of a change of control transaction. The CIC 
Plan was not adopted in contemplation of any specific change of 
control transaction. A brief description of the material terms and 
conditions of the CIC Plan is provided below. 

Under the CIC Plan, in the event of a change of control of the 
Company and a subsequent termination of employment initiated  
by the Company or a successor company other than for Cause  
or initiated by the employee for a Good Reason Resignation (as 
hereinafter defined) in each case within 12 months following a 
change of control transaction, (i) the Chief Executive Officer  
would each be entitled to receive cash severance pay equal to  
24 months base salary plus annual target incentive pay, the 
extension of employee benefits over this severance period and  

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nOte 11—cOmprehensive lOss 
Comprehensive loss is comprised of net loss and accumulated other 
comprehensive income (loss) and includes the following components  
(in thousands): 

Years ended December 31, 

2006 

2005 

2004

$  (154,761)  $  (185,111)  $  (101,886)

Net loss, as reported 
Change in net unrealized 
  gains (losses) on  
  available-for-sale securities 
Net unrealized gains  

1,458 

(101)   

(2,12)

reclassified into earnings  

Translation adjustment 

— 
311 

— 

(1,250)   

23
72 

Total comprehensive loss  $  (152,992)  $  (186,462)  $  (103,200)

The components of accumulated other comprehensive loss are as follows 
(in thousands): 

Unrealized loss on  
  available-for-sale securities 
Translation adjustment 

Total accumulated other  
  comprehensive income (loss) 

December 31, 

2006 

2005 

$  (499) 
561 

$  (1,57)
250

$ 

62 

$  (1,707)

notes To consolidated Financial Statements   
December 31, 2006 (continued)  

the full acceleration of unvested outstanding equity awards, and  
(ii) the Chief Scientific Officer, Senior Vice Presidents and Vice 
Presidents (including Principal Fellows) would each be entitled to 
receive cash severance pay equal to 12 months base salary plus 
annual target incentive pay, the extension of employee benefits  
over this severance period and the full acceleration of unvested 
outstanding equity awards. In the event of a change of control of 
the Company and a subsequent termination of employment initiated 
by the Company or a successor company other than for Cause (as 
hereinafter defined) within 12 months following a change of control 
transaction, all other employees would each be entitled to receive 
cash severance pay equal to 6 months base salary plus annual 
target incentive pay, the extension of employee benefits over this 
severance period and the full acceleration of each such employee’s 
unvested outstanding equity awards. 

On December 6, 2006, the Board of Directors approved an 
amendment to all outstanding stock awards held by non-employee 
directors to provide for full acceleration of vesting in the event of a 
change of control transaction. 

reserved shares 
At December 31, 2006, we have reserved shares of common stock for 
issuance as follows (in thousands): 

Convertible subordinated notes 
Stock options and restricted stock units 
ESPP 
401(k) retirement plans 

Total 

16,86 
16,337
317
81

  33,631

44

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

nOte 12—signiFicant cOllaBOrative 
research and develOpment agreements 
We perform research and development for our biotechnology and 
pharmaceutical partners pursuant to collaboration agreements. 

Revenues generated from our collaboration efforts are recorded as 
Contract Research revenue and our costs of performing these services 
are included in Research and Development expense. In accordance 
with these agreements, we recorded Contract research revenue as 
follows (in thousands): 

Partner 

Pfizer Inc. 

Novartis Pharma AG 
Zelos Therapeutics, Inc. 
Bayer Healthcare AG 
Baxter Healthcare SA 
Solvay Pharmaceuticals, Inc. 
Other 

Contract research revenue 

Molecule 

2006 

2005 

2004 

Exubera® (insulin human [rDNA origin])  
Inhalation Powder, Somavert® (pegvisomant) 
Tobramycin inhalation powder (TIP) 
Pulmonary Ostabolin-C 
Ciprofloxacin Inhalation Powder (CIP) 
Poly(ethylene) glycol reagent 
Pulmonary dronabinol (Dronabinol metered dose inhaler) 

$  29,315  $  64,01  $  6,37
7,307
—
—
—
5,43
6,88 

8,516 
5,479 
4,885 
3,690 
1,002 
3,416 

4,831 
3,487 
4,074 
310 
2,756 
2,053 

Under these collaborative research and development agreements, 
we are reimbursed for the cost of work performed on a revenue per 
annual full-time employee equivalent (FTE) basis, plus out of pocket 
third party costs. The initial annual FTE rate is established when the 
contract is executed and generally increases each year based on 
the consumer price index. Revenue recognized approximates the 
costs associated with these billable services. 

We also are typically entitled to receive milestone payments when 
and if certain development or regulatory milestones are achieved. 
All of our research and development agreements are generally 
cancelable by our partners without significant financial penalty to 
the partner. 

pfizer inc. 
We are party to a collaboration agreement with Pfizer to develop 
Exubera based on our Pulmonary Technology. Under the terms  
of the agreement, we receive contract research and development 
revenue as well as milestone revenues relating to the Exubera 
Inhalation Powder and Exubera Inhalers. 

We are party to a license, manufacturing, and supply agreement 
with Pfizer whereby we provide one of our PEG reagents used  
in the manufacture of Somavert (pegvisomant), a human growth 
hormone receptor antagonist that has been approved for use in the 
U.S. and EU for the treatment of certain patients with acromegaly. 

novartis pharma ag 
We are party to a collaboration agreement with Novartis  
Pharma AG (formerly Chiron Corporation) to develop a dry  
powder inhaled formulation of tobramycin for the treatment of 
Pseudomonas aeruginosa in cystic fibrosis patients and to explore 
the development of other inhaled antibiotics using our Pulmonary 
Technology. We may receive research and development funding, 
milestone payments as the program progresses through further 
clinical testing, and may receive royalty payments on product sales 
and manufacturing revenues if the product is commercialized. 

$  56,303  $  81,602  $  8,185

zelos therapeutics, inc. 
We are party to a collaboration to develop an inhaleable powder 
form of Zelos Therapeutics’ parathyroid hormone (PTH) analogue, 
called Ostabolin-CTM. Under the terms of the agreement, Nektar  
is responsible for development of the formulated dry powder  
drug and inhalation system, as well as clinical and commercial 
manufacturing of the drug formulation and device combination. 
Zelos is responsible for supply of the active pharmaceutical 
ingredient or API, clinical development and commercialization.  
We receive research and development funding, milestone payments 
as the program progresses through further clinical testing, and  
may receive royalty payments on product sales and manufacturing 
revenues if the product is commercialized. 

Bayer healthcare ag 
We are party to a collaboration agreement with Bayer HealthCare 
AG to develop an inhaleable powder formulation of a novel form  
of Ciprofloxacin (Cipro) to treat chronic lung infections caused by 
Pseudomonas aeruginosa in cystic fibrosis patients. Under the terms 
of the collaboration, Nektar is responsible for formulation of the  
dry powder drug and development of the inhalation system, as well 
as clinical and commercial manufacturing of the drug formulation 
and device combination. Bayer is responsible for the clinical 
development and worldwide commercialization of the system.  
We receive research and development funding, milestone payments 
as the program progresses through further clinical testing, and  
may receive royalty payments on product sales and manufacturing 
revenues if the product is commercialized. 

Baxter healthcare sa and Baxter healthcare corp. 
We are party to a collaboration agreement with Baxter Healthcare 
SA and Baxter Healthcare Corp., to develop a product to extend the 
half-life of Hemophilia A proteins using our PEGylation Technology. 
These products are in pre-clinical development for treatment of 
Hemophilia A. We will receive research and development funding, 
milestone payments and royalty payments on sales of the products. 
Nektar will supply, and will receive manufacturing revenues for, the 
poly(ethylene) glycol reagent used in the products for preclinical, 
clinical and commercial purposes.

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notes To consolidated Financial Statements   
December 31, 2006 (continued)  

solvay pharmaceuticals, inc. 
We are party to a collaboration agreement with Unimed 
Pharmaceuticals, Inc., a wholly owned subsidiary of Solvay 
Pharmaceuticals, Inc., to develop a formulation of dronabinol 
(synthetic delta--tetrahydrocannabinol) to be delivered using  
a metered dose inhaler. The product is under development for 
multiple indications. Dronabinol is the active ingredient in Unimed’s 
MARINOL® capsules, which are approved in the U.S. for multiple 
indications. Solvay initiated Phase II trials for pulmonary dronabinol 
in 2005 for the treatment of migraines with and without aura.  
We may receive research and development funding, milestone 
payments as the program progresses through further clinical 
testing, and may receive royalty payments on product sales and 
manufacturing revenues if the product is commercialized. 

nOte 13—BradFOrd, uk OperatiOns 
In December 2005, we determined that the assets of our UK 
subsidiary, located in Bradford, England (“Bradford”), were 
significantly impaired, and recorded an impairment charge of  
$5.6 million related to our goodwill asset and $5.7 million of 
accelerated depreciation related to certain fixed assets. These 
amounts are reflected in the Impairment of long-lived assets line 
item in the Consolidated Statement of Operations. Bradford’s 
primary activities related to the Super Critical Fluid Technology 
reporting unit as defined under SFAS No. 142: Goodwill and  
Other Intangible Assets. These impairment charges represented  
a substantial portion of the fair value of Bradford’s net assets as  
of December 31, 2005. 

In March 2006, the Bradford employees were notified of a  
potential shut-down of operations. Retention and severance 
incentives were communicated at that time. In June 2006, we 
involuntarily terminated the majority of the personnel located in 
Bradford and commenced with plans to wind-down the location  
and its related operations. The retention and severance incentives 
totaling approximately $2. million were paid and expensed to 
research and development during the first and second quarters  
of 2006. Also in June 2006, we reassessed the useful life of the 
remaining laboratory and office equipment and determined these 
assets could not be redeployed and had no future use. Due to our 
revised estimate of useful life of these assets, we accelerated 
approximately $1.2 million of remaining depreciation in June 2006, 
which is reflected in the Impairment of long-lived assets line item in 
the Consolidated Statement of Operations. In the third quarter of 
2006, we met the cease-of-use criteria outlined in SFAS No. 146: 
Accounting for Cost Associated with Disposal or Exit Activities  
and terminated the majority our facility leases in Bradford. As a 
result, we recorded approximately $1.0 million to general and 
administrative expense, related primarily to restoration costs 
necessary to return the buildings to their original condition. 

nOte 14—incOme taxes 
For financial reporting purposes, “Loss before provision for income 
taxes,” includes the following components (in thousands):  

2006 

2005 

2004 

$  (147,059)  $ (172,232)  $ 

  (6,874) 

(13,016) 

(5,)
  (6,050)

$  (153,933)  $  (185,248)  $  (102,04)

Domestic 
Foreign 

Total 

46

As of December 31, 2006, we had a net operating loss 
carryforward for federal income tax purposes of approximately 
$640.0 million, which will expire beginning in the year 2007.  
We had a total state net operating loss carryforward of 
approximately $323.0 million, which expires beginning in 2010.  
We had a foreign net operating loss carryforward of approximately 
$52.0 million. A substantial portion of the foreign net operating 
losses are UK losses which can be carried forward indefinitely. 

Utilization of the federal and state net operating loss and credit 
carryforwards may be subject to a substantial annual limitation due 
to the “change in ownership” provisions of the Internal Revenue 
Code of 186 and similar state provisions. The annual limitation 
may result in the expiration of net operating losses and credits 
before utilization. 

The (provision) benefit for income taxes consists of the following  
(in thousands): 

2006 

2005 

2004 

Current: 
  Federal 
  State 
  Foreign 

Total Current 

Deferred: 
  Federal 
  State 
  Foreign 

Total Deferred 

$ 

— 
(6) 
— 

(6) 

$  — 
  137 
— 

  137 

$ 

—
(665)
—

(665)

— 
(822) 
— 

(822) 

— 
— 
— 

—  

—
828
—

828

(Provision) benefit for  

income taxes 

$  (828) 

$  137 

$  163

Income tax (provision) benefit related to continuing operations differs 
from the amounts computed by applying the statutory income tax rate 
of 34% to pretax loss as follows (in thousands): 

2006 

2005 

2004 

U.S. federal (provision) benefit   
  At statutory rate 
  State taxes 
  Net operating losses  

$  52,337 
(6) 

$  62,84 
137 

$  34,67
163

  not benefited 

(50,385) 

(58,645) 

(33,000)

  Non-deductible employee  

  compensation 
Investment impairment and  
  non-deductible amortization 

  Non-deductible in process  

research charge 

  Other 

Total 

(2,138) 

— 

—

(636) 

(1,667) 

(1,532)

— 
—  

(2,672) 
— 

—
(165)

$ 

(828)  $ 

137 

$ 

163

Deferred income taxes reflect the net tax effects of loss and credit 
carryforwards and temporary differences between the carrying 
amounts of assets and liabilities for financial reporting purposes 

 
 
 
 
 
 
 
 
 
 
     
  
 
 
 
 
 
 
 
 
 
 
 
 
 
     
  
 
 
  
  
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
and the amounts used for income tax purposes. Significant 
components of our deferred tax assets for federal and state  
income taxes are as follows (in thousands): 

Deferred tax assets:
  Net operating loss carryforwards 
  Research and other credits 
  Capitalized research expenses 
  Deferred revenue 
  Reserve and accruals 
  Stock-based compensation 
  Other 

Deferred tax assets  
  before valuation allowance 
 Valuation allowance for  
  deferred tax assets 

December 31,  

2006 

2005 

$  246, 812  $  16,716
20,301 
7,52
7,177
22,332
73
5,186

24,046 
5,991 
7,762 
25,543 
11,901 
4,563 

326,618 

  260,034

(322,508)   

(250,630)

Total deferred tax assets 

$ 

4,110  $ 

,404

approximately $1. million and $1.2 million, respectively of stock 
compensation expense pursuant to APB No. 25 related to RSUs 
that were granted at prices below the fair market value at the date 
of grant. 

Under the modified prospective transition method outlined in  
SFAS No. 123R, we are not required to restate prior period financial 
statements to reflect expensing of stock-based compensation as  
if we had adopted SFAS No. 123R in prior periods. Therefore, the 
results for the year ended December 31, 2006 are not directly 
comparable to the years ended December 31, 2005 and 2004. 
Additionally, these stock-based compensation charges have no 
impact on our financial position or reported cash flows. 

Stock-based compensation cost is recorded in the following line 
items of our Consolidated Financial Statements among the 
following categories: 

Year ended
December 31, 
2006 

$ 

51
1,563
9,692
17,837

$  29,143 

Deferred tax liabilities:
  Depreciation 
  Acquisition related intangibles 

Total deferred tax liabilities 

Net deferred tax assets 

(2,715)   
(1,395)   

(4,127)
(4,455)

$ 

$ 

(4,110)  $ 

(8,582)

Total 

—  $ 

822

Inventory 
Cost of goods sold 
Research and development 
General and administrative expenses 

Realization of our deferred tax assets is dependent upon  
future earnings, if any, the timing and amount of which are 
uncertain. Because of our lack of earnings history, the net  
deferred tax assets have been fully offset by a valuation  
allowance. The valuation allowance increased by $71. million,  
and $31.2 million during the years ended December 31, 2006,  
and 2005, respectively. The valuation allowance includes 
approximately $35.1 million of benefit related to employee  
stock option exercises which will be credited to additional paid in 
capital when realized. Also, at December 31, 2006, approximately 
$14.0 million of the valuation allowance relates to acquisition 
related items, if and to the extent realized in future periods, will  
first reduce the carrying value of goodwill, then other long-lived 
intangible assets of our acquired subsidiary and then income tax 
expense. We also have federal research credits of approximately 
$14.5 million, which expire beginning in the year 2007 and state  
tax research credits of approximately $13.5 million which have no 
expiration date. 

nOte 15—stOck-Based cOmpensatiOn 
We issue stock-based awards from two compensation plans, which 
are more fully described in Note 10—Stockholders’ Equity. For the 
period ended December 31, 2006 we recorded approximately 
$2.1 million of stock-based compensation expense, which includes 
approximately $11.8 million of expense related to modifications of 
certain stock grants in connection with employment separation 
agreements. Generally, the modifications extended the optionee’s 
exercise period beyond the 0 day period after termination and 
accelerated a portion of the optionee’s unvested grants. In addition, 
during the year ended December 31, 2005 and 2004, we recorded 

Black-scholes assumptions 
Upon adoption of SFAS No. 123R, we applied the guidance in  
Staff Accounting Bulletin No. 107 that permits the initial application 
of a “simplified” method based on the average of the vesting term 
and the term of the option. Previously, we calculated the estimated 
life based on the expectation that options would be exercised  
within five years on average. We based our estimate of expected 
volatility for options granted in fiscal year 2006 on the daily 
historical trading data of our common stock over the period 
equivalent to the expected term of the respective stock-based 
grant. Generally the stock-based grants have expected terms 
ranging from 38 months to 64 months. For the period ended 
December 31, 2006, the annual forfeiture rate for executives and 
staff was estimated to be 4.7% and 7.4%, respectively, based on  
our qualitative and quantitative analysis of our historical forfeitures. 

The following tables list the Black-Scholes assumptions used to 
calculate the fair value of employee stock options and ESPP 
purchases. The grant date fair value of RSU awards is always equal 
to the intrinsic value of the award on the date of grant since the 
awards were issued for no consideration. The weighted average life 
of the 2006 RSUs is estimated to be 2.4 years. 

Year ended
December 31, 2006 

Employee  
Stock 
Options 

4.8% 
0.0% 
63.1% 

ESPP 

5.2%
0.0%
33.3%

5.20 years  0.5 years

Average risk-free interest rate 
Dividend yield 
Volatility factor 
Weighted average expected life 

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notes To consolidated Financial Statements   
December 31, 2006 (continued)  

summary of stock Option activity 
The table below presents a summary of stock option activity under the 2000 Equity Incentive Plan, the Non-Employee Directors’ Stock Option 
Plan and the 2000 Non-Officer Equity Incentive Plan (in thousands, except for per share information): 

Balance at December 31, 2003 
  Options granted 
  Options exercised 
  Options expired and canceled 

Balance at December 31, 2004 
  Options granted 
  Options exercised 
  Options expired and canceled 

Balance at December 31, 2005 
  Options granted 
  Options exercised 
  Options expired and canceled 

Balance at December 31, 2006 

Exercisable at December 31, 2006 
Exercisable at December 31, 2005 
Exercisable at December 31, 2004 

Options Outstanding

Number of 
Shares 

Exercise price 
Per Share 

14,851 
1,34 
(1,817) 
(841) 

13,587 
1,71 
(1,014) 
(1,115) 

13,24 
1,115 
(2,160) 
(1,501) 

$   0.01-61.63 
  10.10-22.4 
  0.01-1.25 
  0.01-56.38 

  0.01-61.63 
  13.46-1.76 
  0.01-18.47 
  3.88-56.38 

$  0.01-61.63 
  14.36-21.51 
  0.05-20.41 
  4.62-52.16 

Weighted- 
Average  
Exercise 
Price 
Per Share 

$  16.4 
17.33 
7.52 
  20.86 

17.57 
17.44 
.47 
21.34

$  17.85 
17.88 
.51 
  21.86 

Weighted-
Average
Remaining 
Contractual 
Life (in years) 

Aggregate
Intrinsic
Value1

6.65 

$  44,103 

$  20,72

6.03 

$  7,055

$  8,18

5.38 

$  37,678 

10,703 

$  0.01-61.63 

18.7 

8,185 
,468 
,066 

  1.88 
  1.08 
  18.30 

4.78 

4.0 
4.6 
5.25 

$  18,651

$  15,348

$  12,22
$  25,67 
$  4,856

1  Aggregate Intrinsic Value represents the difference between the exercise price of the option and the closing market price of our common stock on the exercise date or 
December 31, as applicable. 

The weighted-average grant-date fair value of options granted during the years 2006, 2005 and 2004 was $10.54, $10.26 and  
$10.45, respectively. 

The following table provides information regarding our outstanding stock options as of December 31, 2006 (in thousands except for share 
information and contractual life):

Options Outstanding 

Options Exerciseable 

Weighted-Average 
Exercise Price 
Per Share 

Weighted-Average 
Remaining Contractual 
Life (in years) 

$  6.25 
  11.76 
  14.12 
  15.31 
17.4 
  18.83 
  22.02 
27.74 
  36.28 

$  18.7 

5.5 
4.25 
3.83 
4.07 
6.72 
6.56 
4. 
3.5 
3.75 

4.78 

Number 

1,156 
1,140 
1,187 
1,102 
1,201 
1,134 
1,142 
1,701 
40 

10,703 

Weighted-Average
Exercise Price
Per Share 

$ 

6.06
11.87  
14.0
15.27  
17.82
18.87  
22.81  
27.74  
36.27

$  1.88

Number 

871 
1,001 
80 
72 
571 
535 
75 
1,701 
3 

8,185 

Range of 
Exercise 
Prices 

$ 

0.01-8.66 
8.67-13.54 
    13.62-14.50 
   4.53-16.17 
   16.1-18.34 
    18.38-1.55 
    1.5-23.50 
    23.4-27.88 
    27.6-61.63 

$  0.01- 61.63 

48

 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
aggregate unrecognized  
stock-based compensation expense 
As of December 31, 2006, there was approximately $38.4 million of 
aggregate unrecognized compensation expense related to unvested 
stock-based compensation arrangements under the Option Plans.  
This total unrecognized expense is expected to be recognized over  
a weighted-average period of approximately 2.6 years as follows: 

  Fiscal Year 

2007 
2008 
200 
2010 

2011 and thereafter 

Total 

(in millions) 

$  17,135 
$  11,011 
$  6,446 
$  2,84 
836 
$ 

$  38,412

summary of rsu award activity 
During 2006, we issued RSU awards totaling 1,088,300 shares  
of our common stock to certain employees and directors. The RSU 
awards are settled by delivery of shares of our common stock on  
or shortly after the date the awards vest. A significant portion of 
these awards vest base upon achieving three pre-determined 
performance milestones which were initially expected to occur over 
a period of 40 months. We are expensing the grant date fair value 
of the awards ratably over the expected performance period. During 
the period ended September 30, 2006 management determined 
that one of the milestones, representing 40% of the total awards, 

A summary of RSU activity is as follows (in thousands): 

was no longer probable (as defined in SFAS No. 5: Accounting  
for Contingencies) of vesting. As a result, we reversed all  
previously recorded compensation expense related to this 
performance milestone, or approximately $0.8 million. If we had 
determined that this milestone was probable, we would have 
expensed an additional $1. million during the year ended 
December 31, 2006. The remaining 60% of the performance  
based RSUs are expected to vest over a 27 month period from  
the award date. We recorded compensation expense of $5.0 million 
in the year ended December 31, 2006 related to the remaining 
60% of these performance-based RSU awards. 

In February 2004 and March 2005, we issued 206,666 and 
112,000 RSU awards, respectively to certain officers and 
employees on a time-based vesting schedule. Expense for these 
awards is recognized ratably over the underlying time-based vesting 
period and will settle by delivery of shares of our common stock on 
or shortly after the date the awards vest. The RSU awards become 
fully vested over a period of 36 to 48 months. The intrinsic value  
of these awards was recorded as deferred compensation in the 
Statement of Stockholders’ Equity and totaled approximately  
$2.0 million and $3. million for the years ended December 31, 2005 
and 2004, respectively. Upon adoption of SFAS No. 123R, we 
reversed this unamortized value from stockholders’ equity, but 
continue to expense the remaining intrinsic value, which 
approximated the awards’ fair value on the original grant date, 
ratably over the underlying vesting period. In connection with  
these RSU awards, we recorded compensation expense of  
$1.3 million, $1. million and $1.2 million for the years ended 
December 31, 2006, 2005 and 2004, respectively.  

Balance at January 1, 2004 
  Granted 

Balance at December 31, 2004 
  Granted 
  Released 

Balance at December 31, 2005 
  Granted 
  Released 
  Forfeited & Canceled 

Balance at December 31, 2006 

Units Issued 

—  
206 

206 
112 
(34) 

284 
1,088 
(178) 
(110) 

1,084 

Weighted-Average
Remaining 
Contractual Life 
In Years 

Weighted-Average 
Grant-Date 
Fair Value 

$  18.57

$  18.30

$  1.55

1.52 

1.14 

1.52 

Aggregate
Intrinsic
Value 

—

$  4,214

$ 

518

$  4,676

$  3,184

$  16,479 

1   Fair value represents the difference between the exercise price of the award and the closing market price of our common stock on the release date or the year ended 

December 31, as applicable. 

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nOte 16—segment repOrting 
We operate in one business segment which focuses on applying  
our technology platforms to improve the performance of established 
and novel medicines. We believe we operate in one segment 
because our business offerings have similar economic and other 
characteristics, including the nature of products and production 
processes, types of customers, distribution methods and regulatory 
environment. We are comprehensively managed as one business 
segment by our Executive Committee, who reports to the Chief 
Executive Officer, and is our chief operating decision maker. Within 
our one business segment we have two components, Pulmonary 
Technology and PEGylation Technology. 

Our revenue is derived primarily from clients in the pharmaceutical 
and biotechnology industries. Revenue from Pfizer Inc. represented 
64%, 64% and 61% of our revenue for the years ended December 
31, 2006, 2005 and 2004, respectively. 

Revenues from customers in the following geographic areas are as 
follows (in thousands): 

Years ended December 31, 

2006 

2005 

2004 

United States 
European countries 
All other countries 

$  182,959  $  10,488  $ 100,855 
14,67    11,606 
1,80

33,471   
1,288   

1,824   

Total Revenue 

$  217,718  $  126,27  $ 114,270

At December 31, 2006, the net book value of our property, plant 
and equipment was $133.8 million. Approximately 88% of such 
assets are located in the United States. At December 31, 2005,  
the net book value of property, plant, and equipment was  
$142.1 million, and approximately 85% of such assets were  
located in the United States. 

notes To consolidated Financial Statements   
December 31, 2006 (continued)  

proforma effects of applying  
sFas no. 123 to prior periods 
Prior to adoption SFAS No. 123R on January 1, 2006, we 
accounted for stock-based compensation under APB No. 25 and 
elected the disclosure only method of presenting fair value stock-
based compensation expense. The disclosure only method required 
the presentation of net income (loss) as if SFAS No. 123 had been 
adopted for all periods presented in the Statements of Operations. 

For purposes of the proforma net loss disclosure related to our 
employee stock options and ESPP purchases, we computed the 
estimated grant date fair values of the stock-based compensation 
using the Black-Scholes option valuation model based on the 
following assumptions:  

Risk-free interest rate 
Dividend yield 
Volatility factor 
Weighted average expected life 

December 31, 

2005 

2004 

4.0% 
0.0% 
0.710 
4.5 years 

3.3%
0.0%
0.707
5.0 years

In the table below, we have presented proforma disclosures  
of our net loss and net loss per share for the prior year periods 
assuming the estimated fair value of the options granted  
prior to January 1, 2006 is amortized to expense over the  
option-vesting period. 

Revised 
Year ended
December 31,  December 31

Year ended 

2005 

2004* 

$  (185,111) 

$  (101,886)

Net loss, as reported 
Add: Stock-based employee  
  compensation expense included  
  in reported net loss 
Less: Total stock-based employee  
  compensation expense determined  
  under fair value based method for all  
  options and RSUs granted 

1,854 

1,423

(21,86) 

(25,183)

Proforma net loss 

$  (205,243) 

$  (125,646)

Net loss per share: 
Basic and diluted—as reported 
Basic and diluted—proforma 

$ 
$ 

(2.15) 
(2.3) 

$ 
$ 

(1.30)
(1.60)

*  The revised reported proforma net loss for the year ended December 31, 2004 
was decreased by approximately $6.0 million for options exchanged under the stock 
option exchange programs and adjustments for computational corrections. 

50

 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
notes To consolidated Financial Statements   

December 31, 2006 (continued)  

nOte 17—selected quarterly  
Financial data (unaudited) 
The following table sets forth certain unaudited quarterly financial 
data. In our opinion, the unaudited information set forth below has 
been prepared on the same basis as the audited information and 
includes all adjustments necessary to present fairly the information 
set forth herein. We have experienced fluctuations in our quarterly 
results. We expect these fluctuations to continue in the future.  

Due to these and other factors, we believe that quarter-to-quarter 
comparisons of our operating results will not be meaningful, and 
you should not rely on our results for one quarter as an indication of 
our future performance. Certain items previously reported in specific 
financial statement captions have been reclassified to conform to 
the current period presentation. Such reclassifications have not 
impacted previously reported revenues, operating loss or net loss. 
All data is in thousands except per share information. 

fiscal year 2006 

Fiscal Year 2005 

Q1 

Q2 

Q3 

Q4 

Q1 

Q2 

Q3 

Q4 

Product sales and  
royalty revenue 

Contract research revenue 
Exubera commercialization  

$  12,397  $  44,157  $  41,451  $  55,551  $ 
,054
$  14,817  $  14,322  $  15,111  $  12,053  $  1,52  $  1,552  $  23,657  $  18,864 

6,32  $ 

5,470  $ 

8,450  $ 

readiness revenue 

$ 

1,745  $ 

1,744  $ 

2,070  $ 

2,300  $ 

2,573  $ 

3,528  $ 

4,247  $ 

4,63 

Gross margin on  
  product sales 
Research and development  
  expenses 
General and administrative  
  expenses 
Litigation Settlement 
Impairment of long  

lived assets 
Operating loss 
Interest expense 
Net loss 
Basic and fully diluted  
  net loss per share 1 

$  4,897  $ 

8,426  $  10,861  $  15,451  $ 

1,137  $ 

37  $ 

2,325  $ 

2,13 

$  31,401  $  40,474  $  34,985  $  42,521  $  34,45  $  35,785  $  38,51  $  42,338 

$  20,373  $  26,063  $  14,442  $  17,441  $ 
—  $ 
$ 

—  $  17,710  $ 

—  $ 

,110  $  10,135  $  10,48  $  13,65

—  $ 

—   $ 

—  $ 

—  

—  $ 

1,156  $ 

$ 
—   $  65,340 
$  (33,174)  $  (63,212)  $  (22,682)  $  (40,162)  $  (24,02)  $  (26,450)  $  (23,367)  $  (108,724)
$  5,142  $ 
5,177 
$  (33,471)  $  (62,831)  $  (19,604)  $  (38,855)  $  (26,165)  $  (26,12)  $  (23,75)  $  (108,23)

4,938  $ 

5,255  $ 

3,060  $ 

8,254  $ 

2,856  $ 

4,921  $ 

2,2  $ 

—  $ 

—   $ 

—   $ 

$ 

(0.38)  $ 

(0.70)  $ 

(0.22)  $ 

(0.43)  $ 

(0.31)  $ 

(0.32)  $ 

(0.28)  $ 

(1.23)

1  Quarterly loss per share amounts may not total the year-to-date loss per share due to rounding. 

nOte 18—suBsequent events (unaudited) 
On January 8, 2007, we announced the appointment of  
Howard W. Robin as our new President and Chief Executive Officer 
(“CEO”), effective January 15, 2007. Mr. Robin replaced Acting 
President and CEO Robert Chess who will remain Chairman of the 
Board of Directors. 

On February 7, 2007, we repaid with cash our $36.0 million  
of outstanding 5% convertible subordinated notes plus  
accrued interest. 

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51

 
 
 
 
 
 
 
 
 
 
 
 
nektar corporate information

cOrpOrate headquarters
Nektar Therapeutics 
150 Industrial Road 
San Carlos, CA  4070-6256 
Telephone (650) 631-3100 
Facsimile (650) 631-3150

annual repOrt On FOrm 10-k
Copies of Nektar’s Annual Report on Form 10-K, exclusive of 
exhibits, are available without charge upon written request to:

Investor Relations 
Nektar Therapeutics 
150 Industrial Road 
San Carlos, CA  4070-6256

Or via email to: 
investors@nektar.com; Online copies can also be obtained  
at www.nektar.com under “Investor Relations.”

annual meeting
The Annual Meeting of Stockholders  
will be held on  
June 7, 2007  
1:00-2:30 p.m. (PST) 
Crystal Springs Ballroom 
San Mateo Marriott Hotel 
1770 S. Amphlett Blvd. 
San Mateo, CA  4402 
650.653.6034

cOrpOrate cOunsel
Cooley Godward LLP 
Palo Alto, CA

independent auditOrs
Ernst & Young LLP 
Palo Alto, CA

transFer agent  
and stOckhOlder services
Mellon Investor Services, LLC 
525 Market Street, Suite 3500 
San Francisco, CA  4105 
1-800-522-6645

The following graph shows the total stockholder return of an 
investment of $100 in cash on December 31, 2001 for: (i) our 
common stock; (ii) the RDG Total Return Index for the Nasdaq 
Stock Market (U.S. companies); and (iii) the RDG Total Return Index 
for the Nasdaq Pharmaceutical Stocks for the period commencing  
on December 31, 2001 and ending on December 31, 2006  
(2) All values assume reinvestment of the full amount of all 
dividends and are calculated as of December 31 of each year.”

Comparison of 5-Year Cumulative Total Return

Among Nektar Therapeutics, The NASDAQ Composite Index 
And The NASDAQ Pharmaceutical Index

$160

$140

$120

$100

$80

$60

$40

$20

0

12/01

12/02

12/03

12/04

12/05

12/06

Nektar Therapeutics

NASDAQ Composite NASDAQ Pharmaceutical

* 

 $100 invested on 12/31/01 in stock or index-including reinvestment of dividends. 
Fiscal year ending December 31.

securities
Our Common Stock trades on the NASDAQ Market under the symbol “NKTR.” The table below sets forth the high and low closing sales 
prices for our Common Stock (as reported on the NASDAQ Market) during the periods indicated. 

Year ended December 31, 2005

High 

Low 

$  1.80 
$  1.02 
$  1.5 
$  17.4 

$  13.41 
$  13.72 
$  16.24 
$  14.66

1st Quarter 
2nd Quarter 
3rd Quarter 
4th Quarter 

Year ended December 31, 2006

high 

Low 

$  21.76 
$  22.75 
$  18.53 
$  17.20 

$  16.44 
$  16. 
$  13.10 
$  13.6

1st Quarter 
2nd Quarter 
3rd Quarter 
4th Quarter 

52

 
 
 
 
 
 
Nektar Therapeutics is a leader in translating 
advanced PEGylation and pulmonary delivery 
technologies into therapies that transform patient 
care and outcomes. We are the science and 
development expertise behind blockbuster 
products that make a positive difference in the 
lives of patients. We are a public company with a 
deep commitment to creating value for our 
shareholders and making them proud of the 
scientific and medical advances that their support 
enables.

To meet our commitments to patients, physicians 
and shareholders, we are moving our company in a 
new direction. Starting from a position of strength 
made possible by our previous achievements, we 
are moving toward greater efficiency, productivity 
and value creation by reorganizing into specific 
business units and focusing on advancing our 
proprietary pipeline. Never before have we believed 
so strongly in our ability to succeed. Come see 
what the excitement at Nektar is all about.

Table of Contents

	 1 

	 2 

	 4 

	 6 

	 8 

	 9 

	10 

	11 

	23 

 Platforms, People, Products

 Letter to the Shareholders

 PEGylation Technology

 Pulmonary Technology

 Partnered & Proprietary Products

 2006 Financial Review

 Selected Financial Information

 Management’s Discussion and Analysis  
of Financial Condition and Results of Operations

 Report of Independent Registered  
Public Accounting Firm

	25 

26	 

27	 

28	 

30	 

 Management’s Report on Internal Control  
Over Financial Reporting

 Nektar Therapeutics Consolidated Balance Sheets

 Nektar Therapeutics Consolidated Statements  
Of Operations

 Nektar Therapeutics Consolidated  
Statements Of Stockholders’ Equity

 Nektar Therapeutics Consolidated  
Statements Of Cash Flows

31	  Notes To Consolidated Financial Statements

52	  Nektar Corporate Information

53	  Nektar Management Team & Board of Directors

Nektar Management Team

Howard W. Robin
President and  
Chief Executive Officer,  
Director

Louis Drapeau
Senior Vice President,  
Finance and 
Chief Financial Officer

Nevan Elam
Senior Vice President, 
Head of the Pulmonary  
Business Unit

Elizabeth Frisby
Vice President,  
Human Resources

Hoyoung Huh, M.D., Ph.D.
Senior Vice President,  
Business Development 
and Marketing

David Johnston, Ph.D.
Senior Vice President,  
Research and Development

Gil Labrucherie
Senior Vice President,  
General Counsel and Secretary 

Truc Le
Senior Vice President,  
Operations and Corporate Quality

John S. Patton, Ph.D.
Chief Scientific Officer, 
Director and Founder

Christopher J. Searcy, Pharm.D.
Senior Vice President,  
Corporate Development 

David Tolley
Senior Vice President,  
Operations and Site Manager, 
Nektar Alabama

Tim Warner
Senior Vice President,  
Investor Relations  
and Corporate Affairs

Nektar Board of Directors

Susan Wang
Former Executive  
Vice President,  
Corporate Development  
and Chief Financial Officer 
Solectron

Roy A. Whitfield
Former Chairman and  
Chief Executive Officer 
Incyte

Robert B. Chess
Chairman of the Board 
Nektar Therapeutics

Michael A. Brown
Chairman, Line 6 
Director, Former Chairman  
and Chief Executive Officer 
Quantum Corp

Joseph J. Krivulka
Founder and President 
Triax Pharmaceuticals

Christopher A. Kuebler
Former Chairman and  
Chief Executive Officer 
Covance

Irwin Lerner
Former Chairman and  
Chief Executive Officer 
F. Hoffmann-LaRoche

John S. Patton, Ph.D.
Co-Founder and  
Chief Scientific Officer 
Nektar Therapeutics

Howard W. Robin
President and  
Chief Executive Officer 
Nektar Therapeutics

The preceding discussion contains forward-looking statements that involve risks and uncertainties. Nektar’s actual results could differ 
materially from those discussed here. Factors that could cause or contribute to such differences include, but are not limited to, those 
discussed in Part 1 of the Form 10-K filed with the Securities Exchange Commission for the fiscal year ended December 31, 2006 under 
the heading “Risk Factors.”

All Nektar brand and product names are trademarks or registered trademarks of Nektar Therapeutics in the United States and other 
countries. The following, which appear in this Annual Report, are registered or other trademarks owned by the following companies:  
Exubera (Pfizer Inc.); PEGASYS (Hoffmann-La Roche, Ltd.); Neulasta (Amgen Inc.); Cimzia (UCB Group); Definity (Bristol-Myers Squibb 
Medical Imaging, Inc.); Somavert (Pfizer Inc.); PEG-INTRON (Schering-Plough Corporation); SprayGel (Confluent Surgical Inc.); Macugen 
(OSI Pharmaceuticals, Inc.); MARINOL (Solvay Pharmaceuticals, Inc.).

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Nektar Therapeutics
201 Industrial Road
San Carlos, California 94070
USA
+1 650 631-3100 Global Headquarters
+1 650 631-3150 Main FAX
www.nektar.com
NASDAQ: NKTR

2006 ANNUAL REPORT