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ExelixisBIOCRYST PHARMACEUTICALS INC FORM 10-K (Annual Report) Filed 02/27/17 for the Period Ending 12/31/16 Address Telephone CIK Symbol SIC Code Industry 4505 EMPEROR BOULEVARD SUITE 200 DURHAM, NC 27703 919-859-1302 0000882796 BCRX 2836 - Biological Products, Except Diagnostic Substances Biotechnology & Medical Research Sector Healthcare Fiscal Year 12/31 http://www.edgar-online.com © Copyright 2017, EDGAR Online, Inc. All Rights Reserved. Distribution and use of this document restricted under EDGAR Online, Inc. Terms of Use. UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549________________________ Form 10-K________________________ ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2016 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. For the transition period from to . Commission File Number 000-23186 ________________________ BIOCRYST PHARMACEUTICALS, INC.(Exact name of registrant as specified in its charter)________________________ DELAWARE 62-1413174(State of other jurisdiction ofincorporation or organization) (I.R.S. employeridentification no.) 4505 Emperor Blvd., Suite 200, Durham, North Carolina 27703(Address of principal executive offices) (919) 859-1302(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Title of Each Class Name of Each Exchange on Which RegisteredCommon Stock, $.01 Par Value The NASDAQ Global Select Market Securities registered pursuant to Section 12(g) of the Act: Title of classNone________________________ Indicate by a check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒ Indicate by a check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☒ Indicate by a check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 duringthe preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for thepast 90 days. Yes ☒ No ☐ Indicate by a check mark whether the registrant submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to besubmitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that theregistrant was required to submit and post such files). Yes ☒ No ☐ Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein, and willnot be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or anyamendment to this Form 10-K. ☒ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See thedefinitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one): Large accelerated filer ☐ Accelerated filer ☒ Non-accelerated filer ☐ (Do not check if a smaller reporting company) Smaller reporting company ☐ Indicate by a check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2). Yes ☐ No ☒. The Registrant estimates that the aggregate market value of the Common Stock on June 30, 2016 (based upon the closing price shown on the NASDAQ GlobalSelect Market on June 30, 2016) held by non-affiliates was $206,175,247. The number of shares of Common Stock, par value $.01, of the Registrant outstanding as of January 31, 2017 was 73,955,169 shares. DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant’s definitive Proxy Statement to be filed in connection with the solicitation of proxies for its 2017 Annual Meeting of Stockholders areincorporated by reference into Items 10, 11, 12, 13 and 14 under Part III hereof. TABLE OF CONTENTS PART I ITEM 1. BUSINESS4ITEM 1A. RISK FACTORS18ITEM 1B. UNRESOLVED STAFF COMMENTS34ITEM 2. PROPERTIES34ITEM 3. LEGAL PROCEEDINGS34ITEM 4. MINE SAFETY DISCLOSURES35 PART II ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITYSECURITIES35ITEM 6. SELECTED FINANCIAL DATA36ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS36ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK48ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA49ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE75ITEM 9A. CONTROLS AND PROCEDURES75ITEM 9B. OTHER INFORMATION76 PART III ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE76ITEM 11. EXECUTIVE COMPENSATION76ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS76ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE76ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES76 PART IV ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES76SIGNATURES77INDEX TO EXHIBITS78EX-10.74 EX-10.77 EX-21 EX-23 EX-31.1 EX-31.2 EX-32.1 EX-32.2 EX-101 3 PART I ITEM 1.BUSINESS Forward-Looking Statements This report includes forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, which are subjectto the “safe harbor” created in Section 21E. In particular, statements about our expectations, beliefs, plans, objectives or assumptions of future events orperformance are contained or incorporated by reference in this report. All statements other than statements of historical facts contained herein are forward-lookingstatements. We have based these forward-looking statements on our current expectations about future events. While we believe these expectations are reasonable,forward-looking statements are inherently subject to risks and uncertainties, many of which are beyond our control. Our actual results may differ materially fromthose suggested by these forward-looking statements for various reasons, including those discussed in this report under the heading “Risk Factors.” Given theserisks and uncertainties, you are cautioned not to place undue reliance on our forward-looking statements. The forward-looking statements included in this report aremade only as of the date hereof. We do not undertake, and specifically decline, any obligation to update any of these statements or to publicly announce the resultsof any revisions to any forward-looking statements to reflect future events or developments. When used in the report, unless otherwise indicated, “we,” “our,” “us,”the “Company” and “BioCryst” refer to BioCryst Pharmaceuticals, Inc. Our Business We are a biotechnology company that designs, optimizes and develops novel small molecule drugs that block key enzymes involved in the pathogenesis ofdiseases. We focus on the treatment of rare diseases in which significant unmet medical needs exist and align with our capabilities and expertise. We integrate thedisciplines of biology, crystallography, medicinal chemistry and computer modeling to discover and develop small molecule pharmaceuticals through the processknown as structure-guided drug design. Structure-guided drug design is a drug discovery approach by which we design synthetic compounds from detailedstructural knowledge of the active sites of enzyme targets associated with particular diseases. We use X-ray crystallography, computer modeling of molecularstructures and advanced chemistry techniques to focus on the three-dimensional molecular structure and active site characteristics of the enzymes that controlcellular biology. Enzymes are proteins that act as catalysts for many vital biological reactions. Our goal generally is to design a compound that will fit in the activesite of an enzyme and thereby prevent its catalytic activity. Molecules from our discovery efforts which are commercially available or that are in activedevelopment are summarized in the table below: Drug/Drug Candidate Drug Class Therapeutic Area(s) Phase RightsRAPIVAB ®(peramivir injection) Intravenous Neuraminidase Inhibitor Acute uncomplicatedInfluenza Approved(US & Canada) Seqirus (worldwide,except Japan, Taiwan,Korea and Israel)BioCryst retains fullU.S. Governmentstockpiling rights ALPIVAB TM(peramivir injection) Intravenous Neuraminidase Inhibitor Acute uncomplicatedInfluenza MAA filed andbeing reviewedby the EMA Seqirus (worldwide,except Japan, Taiwan,Korea and Israel) RAPIACTA ®(peramivir injection) Intravenous Neuraminidase Inhibitor Uncomplicated seasonalinfluenza Approved(Japan &Taiwan) Shionogi(Japan & Taiwan) PERAMIFLU ®(peramivir injection) Intravenous Neuraminidase Inhibitor Uncomplicated seasonalinfluenza Approved(Korea) Green Cross(Korea) BCX7353 Oral Serine Protease Inhibitor Targeting Kallikrein(intended to be a once-daily treatment) HAE Phase 2 BioCryst(worldwide) Other 2 nd generation HAE compounds Oral Serine Protease Inhibitors Targeting Kallikrein HAE and other indications Preclinical BioCryst (worldwide) Galidesivir (formerlyBCX4430) RNA dependent-RNA Polymerase Inhibitor Broad spectrum antiviral for20 RNA viruses, includingEbola, Marburg, and Zika Phase 1 BioCryst(worldwide) Forodesine Oral Purine Nucleoside Phosphorylase Inhibitor Oncology- PTCL JNDA filed andbeing reviewedby the PMDA inJapan Mundipharma(worldwide) 4 Business Strategy Our business strategy is to create shareholder value by focusing our discovery and development efforts on oral drugs for rare diseases for which a significantunmet medical need exists. We select disease targets and product candidates in which a small molecule would offer a significant benefit over existing products orwould be the first to market. We strive to advance our product candidate portfolio from discovery to commercial markets efficiently by utilizing a small group oftalented and highly-skilled employees working in conjunction with strategic outsource partners. BioCryst is unique in its approach to treat orphan diseases withorally-administered, small molecules utilizing crystallography and structure-guided drug design. The principal elements of our strategy are: • Focusing on High Value-Added Structure-Guided Drug Design Technologies. We utilize structure-guided drug design in order to most efficientlydevelop new therapeutic candidates. Structure-guided drug design is a process by which we design a product candidate through detailed analysis ofthe enzyme target, which the product candidate must inhibit in order to stop the progression of the disease or disorder. We believe that structure-guided drug design is a powerful tool for the efficient development of small-molecule product candidates that have the potential to be safe andeffective. Our structure-guided drug design technologies typically allow us to design and synthesize multiple product candidates that inhibit the sameenzyme target, with the goal of establishing broad patent protection and formulating compounds with competitive advantages. • Selecting Inhibitors that are Promising Product Candidates. We start by selecting disease targets with well-understood biology and characteristicsthat fit with our ability to utilize structure-guided drug design capabilities to build potent and specific enzyme inhibitors. Next, we narrow ourselection of these product candidates based on product characteristics, such as initial indications of safety and biologic activity on the target. • Developing our Product Candidates Efficiently. An important element of our business strategy is to efficiently progress our product candidatesthrough the development process. In order to accomplish this, we strive for disease targets with a defined clinical and regulatory pathway forapproval. In addition, we control fixed costs and overhead by outsourcing with strategic partners and contractors or entering into license agreementswith third parties, including the U.S. Government. We maintain a streamlined corporate infrastructure that focuses our expertise. By contracting withthe U.S. Government and outsourcing certain aspects of our operations, we are able to control overhead costs and focus financial resources directlywhere they provide the most benefit and reduce our business risk. We are a Delaware corporation originally founded in 1986. Our corporate headquarters is located at 4505 Emperor Blvd., Suite 200, Durham, NorthCarolina 27703 and the corporate telephone number is (919) 859-1302. For more information about us, please visit our website at www.biocryst.com. Theinformation on our website is not incorporated into this Form 10-K. Peramivir injection (RAPIVAB ® , RAPIACTA ® , PERAMIFLU ® , ALPIVAB TM ) Peramivir is an intravenous neuraminidase inhibitor approved in multiple countries for the treatment of patients with influenza. Influenza is a seasonal viruswith the highest infection rates generally observed in colder months. In countries for which peramivir is commercially available, influenza occurs primarily duringthe September to April timeframe. Peramivir is available commercially in the United States and has been approved for commercial use in Canada under the nameRAPIVAB ® , in Japan and Taiwan as RAPIACTA ® , and in Korea as PERAMIFLU ® . Peramivir was most recently approved in Canada in January 2017, and was approved in the United States in December 2014, in each case for the treatmentof acute uncomplicated influenza in patients 18 years and older who have been symptomatic for no more than two days. Data from over 2,700 subjects treated withperamivir in 27 clinical trials was utilized to support regulatory approval in these countries. We made RAPIVAB available for commercial sale in the U.S. throughagreements with specialty distributorships during the 2014-2015 influenza season. On June 17, 2015, we announced that we licensed RAPIVAB (peramivirinjection) for the treatment of influenza to CSL Limited (“CSL“), a global biopharmaceutical company. RAPIVAB is being commercialized by a subsidiary ofCSL called Seqirus UK Limited (“SUL” or “Seqirus”), which specializes in influenza prevention through the supply of seasonal and pandemic influenza vaccine toglobal markets. Under the terms of the agreement, SUL obtained worldwide rights to commercialize RAPIVAB, with the exception of Japan, Korea, Taiwan andIsrael. BioCryst retained all rights to pursue pandemic stockpiling orders for RAPIVAB from the U.S. Government, while SUL is responsible for governmentstockpiling outside the U.S. With the out-license of RAPIVAB to SUL, and our recent Canadian regulatory approval, our current goals for RAPIVAB are to: (1)obtain a stockpiling procurement contract with the U.S. Government (2) fulfill our post-approval development requirements, including conducting a pediatric trialin the United States and submitting a supplemental New Drug Application (“sNDA”) for a pediatric indication; and receiving regulatory approval for ourMarketing Authorization Application (“MAA”) in the European Union. In January 2017, we announced that the European Medicines Agency (“EMA”) has accepted the filing of our peramivir injection MAA for treatment ofsymptoms typical of influenza in adults 18 years and older. If the MAA is approved, Seqirus will commercialize peramivir as ALPIVAB TM in the EuropeanUnion. The acceptance of the MAA begins the review process by the EMA under the centralized licensing procedure for all 28 member states of the EuropeanUnion, Norway and Iceland. 5 RAPIVAB was developed under a $234.8 million contract from the Biomedical Advanced Research and Development Authority within the United StatesDepartment of Health and Human Services (“BARDA/HHS”), which expired on June 30, 2014. See “Collaborations and In-License Relationships—BARDA/HHS” below for a further discussion of this development contract. In January 2010, our partner Shionogi & Co., Ltd. (“Shionogi”) received the first approval for peramivir injection and launched it in Japan under thecommercial name RAPIACTA. It is approved for the treatment of adults, children and infants with uncomplicated seasonal influenza and those patients at high-riskfor complications associated with influenza. In August 2010, Green Cross Corporation (“Green Cross”) received marketing and manufacturing approval from theKorean Food & Drug Administration under the commercial name PERAMIFLU to treat patients with influenza A & B viruses, including pandemic H1N1 andavian influenza. In addition, we have a regional collaboration for the development and commercialization of peramivir in Israel. Hereditary Angioedema (“HAE”) Drug Candidates 2nd generation HAE compounds: The goal of our second generation HAE discovery program is to discover and develop oral molecules for the prevention ofHAE attacks which have a superior selectivity and bioavailability profile while maintaining similar potency as compared to avoralstat. HAE is a rare, severelydebilitating and potentially fatal genetic condition that occurs in approximately 1 in 50,000 people. HAE symptoms include recurrent episodes of edema in variouslocations, including the hands, feet, face, genitalia and airway. Airway swelling is particularly dangerous and can lead to death by asphyxiation. In addition,patients often have bouts of excruciating abdominal pain, nausea and vomiting caused by swelling in the intestinal wall. By inhibiting plasma kallikrein, our HAEdrug candidates suppress bradykinin production. Bradykinin is the mediator of acute swelling attacks in HAE patients. In December 2013, we announced the selection of two optimized plasma kallikrein inhibitors to advance into preclinical development as potential once-daily, oral prophylactic treatments for HAE. Based on early preclinical development studies, these structurally different molecules have a similar mechanism ofaction as avoralstat and have achieved the principal goal of improved bioavailability. Both BCX7353 and the other compound had roughly five times betterbioavailability than avoralstat, our first oral drug candidate to treat HAE. These compounds demonstrated sub-nanomolar potency on the isolated enzyme andsingle digit nanomolar potency in suppressing kallikrein activity in an ex-vivo activated normal human plasma kallikrein inhibition (“aPKI”) assay. Plasmaconcentrations of each of the optimized compounds exceeded the aPKI assay EC80 concentration at 24 hours after a single oral dose of 10 mg/kg in rats, indicatingpotential for once-daily dosing. In January 2015, we selected BCX7353 to advance into Phase 1 development as a once-daily, oral prophylactic HAE treatment. Inaddition to BCX7353, we continue to work on and advance other second generation compounds. These molecules are in preclinical development and are beingassessed for safety and efficacy in prophylactic HAE treatment as well as for other potential indications. We will provide additional information on these moleculesas we approach an Investigational New Drug (“IND”) filing or we obtain data suggesting efficacy and safety surrounding these molecules in HAE and othertherapeutic indications. BCX7353: BCX7353 is structurally different from and is expected to have superior efficacy as compared to avoralstat, but has a similar mechanism ofaction targeting plasma kallikrein. On May 13, 2015, we announced the initiation of a Phase 1 clinical trial to evaluate the safety, pharmacokinetics andpharmacodynamics of orally-administered BCX7353 in healthy volunteers. In October 2015, we successfully completed a Phase 1 clinical trial of BCX7353 in Western and Japanese healthy volunteers. In the Western portion of thistrial, we studied BCX7353 single doses of up to 1000mg, once-daily doses of up to 500mg for seven days, and once-daily doses of 350mg for 14 days in healthyWestern volunteers. Plasma levels increased in approximate proportion to dose, and drug exposure was not affected by dosing with food. The half-life of BCX7353was estimated at 50-60 hours. After daily dosing, blood levels met or exceeded a predicted target therapeutic range throughout the 24 hour dosing interval.Inhibition of the target enzyme, plasma kallikrein, was measured in a sensitive and specific bioassay. Daily dosing with BCX7353 strongly inhibited plasmakallikrein at all four dose levels; the degree of inhibition was dose-related (p < 0.0001) and inhibition was sustained throughout the 24 hour dosing interval. Thispharmacodynamic effect correlated strongly to the achieved drug concentration (r = 0.91, p < 0.0001). In the Japanese portion of this trial, we enrolled cohorts of healthy Japanese volunteers and gave single oral doses of BCX7353 of 100mg and 500mg, anddaily doses of 250mg of BCX7353 for seven days. Compared to Western subjects administered the same dose level, plasma drug levels in Japanese subjects weremoderately higher. Kallikrein inhibition on day seven of daily dosing with 250mg in Japanese subjects was similar to that seen at the 350mg daily and 500mg dailydose levels in Western subjects. The combined data from all Phase 1 clinical trials completed as of July 2016 indicates that oral BCX7353 has been generally safe and well tolerated in atotal of 117 healthy volunteers, 46 receiving single doses of up to 1000 mg, and 71 receiving once-daily doses of up to 500 mg for 7 days and 350 mg for 14 days.In our Phase 1 trials, we have observed an approximate 5% rate of drug-related rash in healthy volunteers administered daily doses of BCX7353 for at least 7 days.This drug-related rash appears within the first 14 days of drug administration and resolves within a few days after discontinuing the drug. No serious adverseevents have been seen and no dose-limiting toxicity has been identified. There have been no clinically significant laboratory abnormalities, ECG changes, or vitalsign changes observed. The safety, tolerability, drug exposure and on-target plasma kallikrein inhibition results strongly supported advancing the development program into a Phase2 study in HAE patients. In August 2016, we commenced a Phase 2 trial (“APeX-1”) to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics andefficacy of BCX7353 as a preventative treatment to reduce the frequency of attacks in HAE patients. 6 APEX-1 trial : In August 2016, we announced that we had dosed the first subject in the APeX-1 clinical trial of BCX7353 for the oral treatment of HAE.APeX-1 is a multi-part, Phase 2, randomized, double-blind, placebo-controlled, dose ranging trial to evaluate the safety, tolerability, pharmacokinetics,pharmacodynamics and efficacy of BCX7353 as a preventative treatment to eliminate or reduce the frequency of angioedema attacks in HAE patients. APEX-1 isbeing conducted in several European countries, Australia and Canada. In part 1 of APeX-1, subjects with HAE were randomized in a 1:1 ratio to receive an oraldose of either 350 mg of BCX7353 once daily (“QD”) or placebo QD for 28 days. The primary efficacy endpoints of APeX-1 are the number of angioedemaattacks; attack rate per week, counts of attacks, proportion of subjects with no attacks, and number of attack-free days. Efficacy analyses will be conducted forHAE attacks reported over the entire dosing interval (Days 1 through 28) and during the dosing period in which plasma concentrations of BCX7353 should be atsteady-state conditions (Days 8 through 28). Secondary efficacy endpoints include severity and duration of angioedema attacks and measures of health-relatedquality of life. Safety will be characterized through evaluation of adverse events and laboratory testing. Pharmacokinetics and pharmacodynamic effects will beassessed through measurement of plasma drug levels and kallikrein inhibition. A total of approximately 36 subjects have been enrolled in part 1. On February 27, 2017, we reported statistically significant and clinically meaningful reductions in attack frequency from an interim analysis of part 1 of ourongoing multi-part APeX-1 clinical trial in HAE patients. In the interim analysis, twenty-eight subjects, randomized equally to receive BCX7353 350 mg QD orplacebo for 28 days. The baseline attack rate was approximately 1/week and average C1 inhibitor levels were less than 20% of the normal mean, indicating aseverely affected patient population. Baseline characteristics of trial participants were generally well balanced between the two groups with the exception of priorandrogen use, which was more common in the BCX7353 group (11 of 14 compared with 6 of 14 on placebo). Compliance with study drug dosing in the trial wasexcellent and was greater than 98%. The pre-specified per-protocol (“PP”) interim analysis included data on 24 subjects with confirmed Type 1 or Type 2 HAE and completing 28 days oftreatment (11 on BCX7353 and 13 on placebo). The mean rate of independently-adjudicated angioedema attacks for the pre-defined effective dosing period (weeks2 through 4) in BCX7353-treated subjects was 0.34/week compared to 0.92/week for placebo, a reduction of 0.57/week (63%), p = 0.006. In the intent-to-treat(“ITT”) population of 28 subjects, the rate of attack for the effective dosing period for BCX7353 and placebo groups was 0.44/week and 0.91/week, a reduction of0.47/week (52%), p = 0.035. A pre-planned analysis of peripheral and abdominal attacks showed reductions of 88% and 24%, respectively, for BCX7353 compared with placebo (PPanalysis, weeks 2 through 4). To understand this difference, patient diaries were reviewed and abdominal attacks (n = 9, BCX7353 and n = 14, placebo) weresubdivided into two groups: attacks with abdominal symptoms only and attacks with a combination of abdominal and peripheral symptoms (mixed attacks). Thispost-hoc analysis showed that there were 2, 2 and 7 peripheral, mixed and abdominal-only attacks on BCX7353 compared with 22, 12 and 2 attacks, respectively,for placebo. Based on this distribution, it is likely that subjects recorded abdominal adverse events as HAE attack symptoms in their diary. Accordingly, this post-hoc analysis indicated an 88% reduction in the number of attacks for subjects treated with BCX7353, as compared to the placebo arm, characterized by eitherperipheral symptoms-only or a combination of peripheral and abdominal symptoms. Pharmacokinetic and pharmacodynamic analyses indicate steady state BCX7353 plasma levels in HAE subjects were similar to those in healthy subjectsadministered the same dose in a previously completed Phase 1 trial. Steady state trough drug levels (24 hours after dosing) were 11 – 32 times the 50% effectiveconcentration (EC 50 ) for plasma kallikrein inhibition. These observed steady state drug levels greatly exceeded our proposed therapeutic target range of 4 – 8times the EC 50. Daily oral dosing with BCX7353 strongly inhibited plasma kallikrein throughout the 24-hour dosing interval and the degree of inhibition wassimilar to that seen with this dose in the healthy subject Phase 1 trial. Oral BCX7353 350 mg QD for 28 days was generally safe and well tolerated in subjects with HAE. There were no serious adverse events (AEs) and norelated severe AEs. Two subjects in the BCX7353 treatment group discontinued study drug before day 28, one due to an unrelated pre-existing liver disorder, andone due to an adverse event of gastroenteritis associated with elevated liver enzymes. Treatment-emergent adverse events occurring in at least two subjects overall,enumerated by treatment group (BCX7353 [n=14] and placebo [n=14]), respectfully, were: common cold (3, 4); diarrhea (4, 2); flatulence (2, 0); and fatigue (2, 0).No clinically significant changes in hematology parameters, renal function tests, electrolytes, or urinalysis were observed. One subject treated with BCX7353, withpre-existing colitis, hepatic steatosis (i.e., a fatty liver) and more than 20 years of prior androgen use, had an elevation of alanine aminotransferase (ALT) > 3 timesthe upper limit of normal at the end of treatment, which resolved. Based upon this interim analysis, the efficacy, safety and tolerability profile of BCX7353 observed strongly supports its continued development as aprophylactic treatment for HAE. Furthermore, the steady state drug levels observed greatly exceeded our proposed therapeutic target range of 4 – 8 times the EC 50, thereby supporting and prompting us to evaluate doses of BCX7353 lower than the 350 QD tested in part 1 of the trial. Therefore, the APeX-1 trial has beenamended to add a 62.5 mg QD dose level, and to increase the number of subjects at the 125 mg QD and 250 mg QD dose levels, in order to more fully characterizedose response. Specifically, part 2 of APeX-1 will enroll 14 additional subjects with HAE and they will be randomized to 250mg of BCX7353 QD (n=6), 125mgof BCX7353 QD (n=6) or placebo (n=2) and part 3 of APeX-1 will enroll 20 additional subjects with HAE and they will be randomized to 250mg of BCX7353QD(n=6), 125mg of BCX7353 QD (n=6), 62.5mg of BCX7353 QD (n=6) or placebo (n=2). On October 27, 2015 The Japanese Ministry of Health Labor & Welfare (“MHLW”) announced that BioCryst’s BCX7353 was one of six productsdesignated under MLHW’s new Sakigake fast track review system. The Sakigake Designation System promotes R&D in Japan, aiming at early market availabilityfor innovative pharmaceutical products. This designation provides for additional interactions with the regulatory agency in Japan from early development throughfiling, prioritized development and review, and introduction of the product as soon as possible to address a serious unmet medical need. We expect the results ofAPeX-1 to help us and the MHLW determine the regulatory pathway and timeline for BCX7353 in Japan. Avoralstat : Avoralstat was BioCryst’s first drug candidate as an oral prophylactic treatment for HAE, from a suite of molecules being developed for theprevention of HAE attacks. In December 2014, we began dosing patients in OPuS-2 ( O ral P rophylaxi S-2 ), a blinded, randomized, placebo-controlled clinicaltrial of orally-administered avoralstat in patients with HAE. OPuS-2 was a 12-week, three-arm, parallel cohort design trial to evaluate the efficacy and safety oftwo doses of avoralstat, 300 mg and 500 mg, administered three-times daily compared with placebo. This trial was conducted in the U.S. and select Europeancountries, and it enrolled approximately 100 HAE patients. In the OPuS-2 study, HAE patients with a historical attack frequency of greater than 0.45 attacks perweek were randomized to treatment with either 500 mg or 300 mg of avoralstat, or placebo, administered three times daily for 12 weeks. The primary goals of thetrial were to characterize the efficacy of avoralstat in reducing the frequency of angioedema attacks, and to evaluate the safety and tolerability of 12 weeks ofavoralstat treatment. The primary efficacy endpoint was angioedema attack frequency. 7 In February 2016, we announced results from OPuS-2. Thirty-eight subjects received avoralstat 500 mg, 36 subjects received avoralstat 300 mg, and 36subjects received placebo. Treatment with 500 mg and 300 mg of avoralstat three times daily failed to demonstrate a statistically significantly lower mean attackrate versus placebo. The mean (standard deviation) attack rates per week were 0.63 (0.57) on avoralstat 500 mg and 0.71 (0.66) on avoralstat 300 mg, compared to0.61 (0.41) on placebo. Statistically significant improvements in duration of attacks and in the Angioedema Quality of Life total score were observed comparingthe 500 mg three times a day avoralstat arm to placebo. Following the analysis of OPuS-2 results, the decision was made to discontinue further development ofsoftgel avoralstat formulation in order to focus development efforts on novel dosage forms of avoralstat to achieve meaningfully better drug exposure. In August2016, we reported a clinical pharmacology study of several avoralstat dosage formulations. Cohorts of healthy volunteers received single doses ranging from 200mg to 2000 mg of avoralstat in tablet or suspension formulations, with no clinically significant adverse events reported. While these dosing formulations improvedtotal avoralstat exposure by up to approximately five times compared to a 500 mg dose given as soft gel capsules, the plasma concentration-time profile did notmet our objectives of twice-daily dosing with drug levels at or above the target range. Therefore, we decided to stop further development of avoralstat. Galidesivir (formerly BCX4430) Galidesivir is a broad-spectrum antiviral (“BSAV”) research program and is currently being developed under contracts with the National Institute of Allergyand Infectious Diseases (“NIAID/HHS”) and the U.S. Department of Health and Human Services (“BARDA/HHS”). The objective of our BSAV program is todevelop galidesivir as a broad-spectrum therapeutic for viruses that pose a threat to national health and security. The primary focus of the program is treatment ofhemorrhagic fever viruses. NIAID/HHS funding has supported galidesivir’s development as a treatment for Marburg virus and Ebola virus. In March 2014,galidesivir was featured in an online Nature publication depicting successful efficacy results in animal models of infection with Marburg virus and Ebolavirus. Galidesivir completely protected cynomolgus macaques from Marburg virus infection when administered by intramuscular (“i.m.”) injection 48 hours post-infection. Post-exposure i.m. administration of galidesivir also protected rodents against Marburg virus and Ebola virus infections. In addition, galidesivir wasshown to be active in vitro against a broad range of other RNA viruses, including the emerging viral pathogen Middle East Respiratory Syndrome Coronavirus(“MERS-CoV”). The publication, which reported the protection of non-human primates from filovirus disease by galidesivir, describes efficacy results generatedfrom an ongoing collaboration between scientists in the U.S. Army Medical Research Institute of Infection Diseases (“USAMRIID”) and us. Galidesivir has beenshown to be active against more than 20 RNA viruses in nine different families, including filoviruses, togaviruses, bunyaviruses, arenaviruses, paramyxoviruses,coronaviruses and flaviviruses. In tests conducted at USAMRIID, galidesivir protected animals against parenteral exposures to Marburg, Ebola and Rift ValleyFever viruses and from exposures to aerosolized Marburg virus, an experimental condition designed to mimic an exposure scenario that could result during abioterrorist attack. On December 15, 2014, we announced the dosing of the first subject in a randomized, placebo-controlled Phase 1 clinical trial to evaluate i.m.administration of galidesivir in healthy volunteers. The main goals of this first-in-human study are to evaluate the safety, tolerability and pharmacokinetics ofescalating doses of galidesivir administered via i.m. injection in healthy subjects. In part one of the study, subjects received a single dose of galidesivir; in part twoof the study, subjects received galidesivir for seven days. There were six single-dose cohorts and four multiple-dose cohorts evaluated, and 91 healthy volunteersparticipated. In August 2016, we reported the results of this study. Galidesivir administered by i.m. injection was generally safe and well tolerated over the range ofdoses up to 10 mg/kg, and durations tested (up to 7 days). Fifty subjects received doses of study drug and there were no serious or severe adverse events. The mostfrequently reported adverse event across all cohorts was injection site pain and there were no clinically significant laboratory abnormalities which occurred at anydoses. In addition, co-administration of lidocaine with galidesivir was determined to ameliorate injection site pain without altering the plasma pharmacokineticsprofile of galidesivir. From this clinical trial, we determined galidesivir was safe and well tolerated, and that exposure was dose-proportional and supported thecontinued development of this BSAV drug candidate for serious emerging viral infections. On December 23, 2014, we announced results from a successful proof-of-concept study of galidesivir for the treatment of experimental Ebola virusinfection in Rhesus macaques, conducted at USAMRIID. The primary goal of the study was to assess the effect of galidesivir treatment on survival through Day 41in animals infected with Ebola virus. Dosing of placebo or galidesivir by i.m. injection was initiated 30-120 minutes after virus challenge and continued twice aday (“BID”) for 14 days. Animals were dosed with either placebo, 16 mg/kg of galidesivir BID or 25 mg/kg of galidesivir BID. Survival at day 41 in the 16 mg/kgBID group of galidesivir treated animals was 4 of 6 (66.7%, p < 0.001 compared to 0% survival in controls) and 6 of 6 in the 25 mg/kg BID group (100%, p <0.001 compared to controls). The overall survival rate for galidesivir treated animals at day 41 was 10 of 12 (83%, p < 0.001 compared to controls). Preliminaryevaluation of the quantity of virus in the blood showed an approximate 3-log reduction in Ebola virus RNA copies/mL of plasma, compared with control animals.This Rhesus macaque study was conducted following the completion, in November 2014, of a dose-ranging study of galidesivir for the experimental treatment ofcynomolgus macaques infected with Ebola virus. The cynomolgus macaque study was designed to evaluate whether galidesivir showed a meaningful benefit forsurvival in Ebola virus non-human primate (“NHP”) disease models and explore a dose range. In this study galidesivir demonstrated a statistically significantprolongation of survival for the animals at the highest dose regimen tested, but no animals survived beyond 21 days. On March 7, 2016, results from a preclinical study of our antiviral galidesivir in interferon-receptor-deficient mice infected with Zika virus were presentedat a World Health Organization (“WHO”) conference in Geneva, Switzerland. The primary goal of the study was to assess the effect of galidesivir treatment onsurvival through Day 28 in interferon-receptor-deficient mice infected with the Zika virus. Galidesivir was administered by i.m. injection twice a day beginningfour hours prior to virus challenge and continuing for eight days; two dose levels were tested. In the standard dose galidesivir group, 7 of 8 mice survived throughDay 28. In the low dose galidesivir group (n=8), and in control groups administered vehicle placebo (n=8) or ribavirin at two dose levels (n=16); no animalssurvived to Day 28. Overall survival for the standard dose level of galidesivir was superior to both the placebo and the ribavirin treatment control groups (p <0.0001). For both dose levels of galidesivir, median survival was superior to both control groups (>28 days for galidesivir standard dose and 23 days for low dose)compared to 14 to 17 days for controls. Additional studies of galidesivir in the same mouse model were conducted at Utah State University. In one study, surviving mice that were previouslytreated with the standard dose of galidesivir after initial Zika virus challenge were re-challenged with the Zika virus on Day 28, without additional galidesivirtreatment. All the re-challenged mice survived through day 56 with no disease signs observed, indicating the development of effective immune responses. Afurther experiment using the same AG129 mouse model tested the delayed treatment with galidesivir after viral challenge. Groups of mice received galidesivir 150mg/kg twice-daily by i.m. injection starting on days 1, 3, 5, or 7 post infection, or vehicle (control group). All galidesivir treated groups showed a statisticallysignificant survival benefit compared to vehicle controls. On October 29, 2016, galidesivir nonclinical results from a Zika virus infection model were presented in a late-breaker scientific session at IDWeek by Dr.James B. Whitney, PhD, Assistant Professor of Medicine, Harvard Medical School, and Principal Investigator in the Center for Virology and Vaccine Research atBeth Israel Deaconess Medical Center in Boston. Three groups of five healthy animals were inoculated with a Puerto Rico strain of Zika virus and administeredeither galidesivir by i.m. injection 100 mg/kg BID loading dose followed by 25 mg/kg BID for nine days, galidesivir loading dose of 100 mg/kg BID, or vehiclecontrol. Both galidesivir groups showed reduction in the proportion of animals viremic and in the amount of virus shed of into cerebrospinal fluid, saliva and urine.Galidesivir dosing in rhesus macaques was well-tolerated and offered significant protection against Zika virus infection. In a follow-on experiment, the sameanimals were rechallenged with a Thai strain of Zika virus, 72 days after initial inoculation. All animals demonstrated immune responses, and the initial treatmentswith galidesivir did not impair the generation of immunity. 8 Forodesine Forodesine is a Purine Nucleoside Phosphorylase (“PNP”) inhibitor in development by Mundipharma as a treatment for cancer under a world-wide licenseagreement. PNP is a purine salvage pathway enzyme. High doses of PNP inhibitors could be useful in the treatment of hematological malignancies. Mundipharmahas received orphan drug status for forodesine, and following its successful completion of a Phase 2 pivotal study in recurrent/refractory peripheral T-celllymphoma (“PTCL”) patients in Japan, and has filed a Japanese New Drug Application (“JNDA”) with the Japanese Pharmaceuticals and Medical Devices Agency(“PMDA”). This JNDA is currently under review for regulatory approval in Japan. On November 11, 2011, we entered into an Amended and Restated License and Development Agreement (the “Amended and Restated Agreement”) withMundipharma, amending and restating the February 1, 2006 exclusive, royalty-bearing Development and License Agreement for the development andcommercialization of forodesine for use in the field of oncology. Under the terms of the Amended and Restated Agreement, Mundipharma obtained worldwiderights to forodesine, so Mundipharma controls the worldwide development and commercialization of forodesine and assumes all future development andcommercialization costs. We have licensed the PNP technology from Albert Einstein College of Medicine of Yeshiva University (“AECOM”) and Industrial Research, Ltd. (“IRL”)and will owe sublicense payments to AECOM/IRL based on the future milestone payments and royalties received by us from Mundipharma and any other partnersfor which we out-license our PNP inhibitors. On November 17, 2011, we amended our agreement with AECOM/IRL whereby AECOM/IRL agreed to accept areduction of one-half of the percentage of Net Proceeds (as defined in the license agreement) received by us under our Amended and Restated Agreement withMundipharma. This reduction does not apply to royalty payments made as a result of sales of licensed products by our sub licensees. Collaborations and In-License Relationships U.S. Department of Health and Human Services (“BARDA/HHS”) . In January 2007, BARDA/HHS awarded us a $102.6 million, four-year contract for theadvanced development of peramivir for the treatment of influenza. During 2009, peramivir clinical development shifted to focus on intravenous delivery and thetreatment of hospitalized patients. To support this focus, a September 2009 contract modification was awarded to extend the i.v. peramivir program and to increasefunding by $77.2 million. On February 24, 2011, we announced that BARDA/HHS had awarded us a $55.0 million contract modification, intended to fundcompletion of the Phase 3 development of i.v. peramivir for the treatment of patients hospitalized with influenza. That contract modification brought the totalcontract award from BARDA/HHS to $234.8 million and provided funding to support the filing of an NDA to seek regulatory approval for i.v. peramivir in theU.S. In December 2014, the FDA approved the NDA. The BARDA/HHS contract expired on June 30, 2014 according to its terms, but final governmental auditshave not been conducted to close out the contract. On March 31, 2015, we announced that BARDA/HHS awarded us a contract for the continued development of galidesivir as a potential treatment fordiseases caused by RNA pathogens, including filoviruses. This BARDA/HHS contract has a potential value of $39.1 million if all contract options are exercised.As of December 31, 2016, a total of $20.6 million has been awarded under exercised options within this contract. National Institute of Allergy and Infectious Diseases (“NIAID/HHS”) . In September 2013, NIAID/HHS contracted with us for the development ofgalidesivir as a treatment for Marburg, and subsequently, Ebola virus disease. NIAID/HHS, part of the National Institutes of Health, made an initial award of $5.0million to us. All options under this contract have been awarded and the total contract value is $39.5 million. The goals of this contract, including amendments, areto file IND applications for i.v. and i.m. galidesivir for the treatment of Marburg virus disease and other hemorrhagic fever viruses, to study galidesivir as atreatment for Ebola virus disease, and to conduct a Phase 1 human clinical trial. The contracts with BARDA/HHS and NIAID/HHS are cost-plus-fixed-fee contracts. That is, we are entitled to receive reimbursement for all costs incurredin accordance with the contracts provisions that are related to the development of peramivir and galidesivir plus a fixed fee, or profit. BARDA/HHS andNIAID/HHS will make periodic assessments of progress and the continuation of the contract is based on our performance, the timeliness and quality ofdeliverables, and other factors. The government has rights under certain contract clauses to terminate these contracts. These contracts are also terminable by thegovernment at any time for breach or without cause. Seqirus UK Limited . On June 16, 2015, we and SUL, a limited company organized under the laws of the United Kingdom and a subsidiary of CSL Limited,a company organized under the laws of Australia, entered into a License Agreement (the "SUL Agreement") granting SUL and its affiliates worldwide rights todevelop, manufacture and commercialize RAPIVAB (peramivir injection) for the treatment of influenza except for the rights to conduct such activities in Israel,Japan, Korea and Taiwan (the permitted geographies together constituting the "Territory"). RAPIVAB is an intravenous treatment for acute uncomplicatedinfluenza and is currently approved for use in the United States, Canada, Japan, Taiwan and Korea. RAPIVAB is the first and only intravenous influenza treatmentin the world and was approved by the U.S. Food and Drug Administration in December 2014 for the treatment of acute uncomplicated influenza in patients 18years and older who have been symptomatic for no more than two days. Peramivir was approved by Health Canada in January 2017. We retain all rights andassociated economics to procure pandemic stockpiling orders for RAPIVAB from the U.S. Government, while SUL has the right to pursue government stockpilingoutside the U.S. 9 Pursuant to the SUL Agreement, RAPIVAB will be commercialized by CSL's subsidiary, SUL, which specializes in influenza prevention through thesupply of seasonal and pandemic vaccine to global markets. SUL will manufacture, commercialize and exercise decision-making authority with respect to thedevelopment and commercialization of RAPIVAB within the Territory and be responsible for all related costs, including sales and promotion. We will exercisesole decision-making authority with regard to the development and commercialization of RAPIVAB outside of the Territory and are responsible for all associatedcosts. Under the terms of the SUL Agreement, we are responsible for fulfilling all post-marketing approval commitments in connection with the FDA's approvalof the NDA, and upon fulfillment will transfer ownership of and financial responsibility for the NDA to SUL. Pursuant to potential rights to sellRAPIVAB/ALPIVAB in Canada and the EU, we are also responsible for regulatory filings and interactions with the Health Canada and the European MedicinesAgency until marketing approval for RAPIVAB/ALPIVAB is obtained and assigned to SUL. In accordance with the SUL Agreement, we and SUL formed a jointsteering committee, composed of an equal number of representatives from each party, to oversee, review and coordinate the conduct and progress of thecommercialization of RAPIVAB in the Territory and any additional development. Under the terms of the SUL Agreement, we received an upfront payment of $33.7 million, and may receive up to $12.0 million in additional milestonepayments related to the successful achievement of regulatory milestones, including marketing approval (i) by the FDA for a pediatric indication, (ii) by the EMAfor an adult indication in the EU and (iii) by Health Canada for an adult indication in Canada. We expect to receive a $2.0 million milestone payment as a result ofthe Health Canada approval of RAPIVAB in the first quarter of 2017. We are also entitled under the SUL Agreement to receive tiered royalties at a percentage ratebeginning in the mid-teens contingent upon meeting minimum thresholds of net sales, as well as a low-thirties percentage of the gross profit from governmentstockpiling purchases made outside the U.S. Specifically, we receive tiered royalties at a percentage rate in the mid-teens to low-forties on net sales in the U.S.during a Contract Year (defined as July 1 - June 30) and tiered royalties at a percentage rate in the mid-teens to mid-twenties on net sales in the Territory, otherthan in the U.S., during a Calendar Year, each subject to certain downward adjustments for circumstance or events impacting the overall market opportunity. SUL'sroyalty payment obligations commence on the date of the SUL Agreement and expire, on a country-by-country basis, upon the later of (i) the expiration of legalexclusivity in such country and (ii) ten years from the date of the SUL Agreement (the "Royalty Term"). We developed RAPIVAB under a license from UAB andwill owe sublicense payments to them on any future milestone payments and/or royalties received by us from SUL. The term of the SUL Agreement shall continue on a country-by-country basis until the expiration of the last-to-expire Royalty Term in any such country inthe Territory. Either party may terminate the SUL Agreement in its entirety if the other party breaches a payment obligation, otherwise materially breaches theSUL Agreement, subject to applicable cure periods, or if the other party suffers an insolvency event. We may also terminate the SUL Agreement if SUL or any ofits affiliates seek to challenge the validity of our patents. Termination does not affect a party's rights which have accrued prior thereto, but there are no statedpayments in connection with termination other than payments of obligations previously accrued. For all terminations exercised by us, the SUL Agreement providesfor the termination of any sublicenses granted by SUL to third parties, and in the case of termination by us for cause, the ceasing of SUL's activities with respect toRAPIVAB, the discontinued use of all of our intellectual property and the termination of licenses and rights previously granted to SUL. If requested by us, SULshall also promptly sell to us all licensed product it then holds in stock, otherwise, SUL may continue to sell such licensed product for designated periods. Shionogi & Co., Ltd. (“Shionogi”) . On February 28, 2007, we entered into a License, Development and Commercialization Agreement (as amended,supplemented or otherwise modified, the “Shionogi Agreement”), an exclusive license agreement with Shionogi to develop and commercialize peramivir in Japanfor the treatment of seasonal and potentially life-threatening human influenza. In October 2008, we and Shionogi amended the Shionogi Agreement to expand theterritory covered by the agreement to include Taiwan. Under the terms of the Shionogi Agreement, Shionogi obtained rights to injectable formulations of peramivirin Japan in exchange for a $14.0 million upfront payment. The license provided for development milestone payments (up to $21.0 million), which have all beenpaid, and for commercial milestone payments (up to $95.0 million) in addition to double-digit (between 10% and 20%) royalty payments on product sales ofperamivir. Generally, all payments under the Shionogi Agreement are non-refundable and non-creditable, but they are subject to audit. Shionogi is responsible for alldevelopment, regulatory, and marketing costs in Japan. The term of the Shionogi Agreement is from February 28, 2007 until terminated. Either party mayterminate in the event of an uncured breach. Shionogi has the right of termination without cause. In the event of termination, all license and rights granted toShionogi shall terminate and shall revert back to us. We developed peramivir under a license from the University of Alabama Birmingham (“UAB”) and have paidsublicense payments to UAB on the upfront payments and will owe sublicense payments on any future event payments and/or royalties received by us fromShionogi. Shionogi Royalty Monetization and Non-Recourse Notes Payable . On March 9, 2011, we completed a $30.0 million financing transaction to monetizecertain future royalty and milestone payments under the Shionogi Agreement, pursuant to which JPR Royalty Sub LLC (“Royalty Sub”) a wholly-ownedsubsidiary of BioCryst, issued the PhaRMA Notes discussed below. We received net proceeds of $22.7 million from this transaction. As part of the transaction, we entered into a purchase and sale agreement dated as of March 9, 2011 with Royalty Sub, whereby we transferred to RoyaltySub, among other things, (i) its rights to receive certain royalty and milestone payments from Shionogi arising under the Shionogi Agreement, and (ii) the right toreceive payments under a Japanese yen/US dollar foreign currency hedge arrangement (as further described below, the “Currency Hedge Agreement”) put intoplace by us in connection with the transaction. Royalty payments will be paid by Shionogi in Japanese yen and milestone payments will be paid in U.S. dollars.Our collaboration with Shionogi was not impacted by this transaction. 10 On March 9, 2011, Royalty Sub completed a private placement to institutional investors of $30.0 million in aggregate principal amount of its PhaRMASenior Secured 14.0% Notes due 2020 (the “PhaRMA Notes”). The PhaRMA Notes were issued by Royalty Sub under an Indenture, dated as of March 9, 2011(the “Indenture”), by and between Royalty Sub and U.S. Bank National Association, as Trustee. Principal and interest on the PhaRMA Notes issued are payablefrom, and are secured by, the rights to royalty and milestone payments under the Shionogi Agreement transferred by us to Royalty Sub and payments, if any, madeto Royalty Sub under the Currency Hedge Agreement. The PhaRMA Notes bear interest at 14% per annum, payable annually in arrears on September 1st of eachyear (the “Payment Date”). We remain entitled to receive any royalties and milestone payments related to sales of peramivir by Shionogi following repayment byRoyalty Sub of the PhaRMA Notes. Royalty Sub’s obligations to pay principal and interest on the PhaRMA Notes are obligations solely of Royalty Sub and are without recourse to any otherperson, including the Company, except to the extent of our pledge of its equity interests in Royalty Sub in support of the PhaRMA Notes. We may, but are notobligated to, make capital contributions to a capital account that may be used to redeem, or on up to one occasion pay any interest shortfall on, the PhaRMA Notes. In September 2013, Royalty Sub paid $1.8 million of interest on the PhaRMA Notes from royalty payments received from RAPIACTA sales from thepreceding four calendar quarters. This payment resulted in an obligation shortfall of approximately $2.4 million associated with accrued interest due September 3,2013. As stipulated under the PhaRMA Notes Indenture, if the amount available for payment on any Payment Date is insufficient to pay all of the interest due on aPayment Date, the shortfall in interest will accrue interest at the interest rate applicable to the PhaRMA Notes compounded annually. Accordingly, commencing inSeptember 2013, interest began to accrue at 14% per annum on the interest shortfall of $2.4 million. In March, June and August of 2014, Royalty Sub paidadditional interest of $446,000, $1.9 million and $70,000, respectively, bringing the shortfall down to $222,000 as of September 30, 2014. Under the terms of theIndenture, Royalty Sub’s inability to pay the full amount of interest payable in September 2013 by the next succeeding Payment Date for the PhaRMA Notes,which was September 1, 2014, constituted an event of default. Accordingly, we have classified the PhaRMA Notes and related accrued interest as current liabilitieson our balance sheet. As a result of the event of default under the PhaRMA Notes, the holders of the PhaRMA Notes may pursue acceleration of the PhaRMANotes, may foreclose on the collateral securing the PhaRMA Notes and the equity interest in Royalty Sub and exercise other remedies available to them under theIndenture in respect of the PhaRMA Notes. In such event, we may not realize the benefit of future royalty payments that might otherwise accrue to us followingrepayment of the PhaRMA Notes and we might otherwise be adversely affected. Due to the non-recourse nature of the PhaRMA Notes, in the event of anypotential acceleration or foreclosure, we believe the primary impact to us would be the loss of future royalty payments from Shionogi and legal costs associatedwith retiring the PhaRMA Notes. In addition, we may incur costs associated with liquidating the related Currency Hedge Agreement, which would no longer berequired in the event of foreclosure or if the PhaRMA Notes cease to be outstanding. As the PhaRMA Notes are the obligation of Royalty Sub, we do not currentlyexpect the event of default on the PhaRMA Notes to have a significant impact on our future results of operations or cash flows. As of December 31, 2016, thePhaRMA Notes remain in default. The Indenture does not contain any financial covenants. The Indenture includes customary representations and warranties of Royalty Sub, affirmative andnegative covenants of Royalty Sub, Events of Default and related remedies, and provisions regarding the duties of the Trustee, indemnification of the Trustee, andother matters typical for indentures used in structured financings of this type. The PhaRMA Notes are redeemable at the option of Royalty Sub at any time at aredemption price equal to 100% of the outstanding principal balance of the PhaRMA Notes being redeemed, plus accrued and unpaid interest through theredemption date on the PhaRMA Notes being redeemed. Foreign Currency Hedge . In connection with the issuance by Royalty Sub of the PhaRMA Notes, we entered into a Currency Hedge Agreement to hedgecertain risks associated with changes in the value of the Japanese yen relative to the U.S. dollar. Under the Currency Hedge Agreement, we have the right topurchase dollars and sell yen at a rate of 100 yen per dollar for which we may be required to pay a premium in each year from 2017 through 2020. A payment of$2.0 million will be required if, on May 18 of the relevant year, the U.S. dollar is worth 100 yen or less, as determined in accordance with the Currency HedgeAgreement. The Currency Hedge Agreement does not qualify for hedge accounting treatment; therefore, mark-to-market adjustments are recognized in our ConsolidatedStatement of Comprehensive Loss. Cumulative mark-to-market adjustments resulted in losses of $1.7 million and $0.6 million and a gain of $5.5 million for thetwelve months ended December 30, 2016, 2015 and 2014, respectively. In addition, realized currency exchange gains of $0.8 million and $1.7 million wererecognized in 2016 and 2015, respectively, related to the exercise of a U.S. dollar/Japanese yen currency option under our foreign currency hedge. We are alsorequired to post collateral in connection with the mark-to-market adjustments based on defined thresholds. As of December 31, 2016, no collateral was postedunder the Currency Hedge Agreement. We will not be required at any time to post collateral exceeding the maximum premium payments remaining payable underthe Currency Hedge Agreement. The maximum amount of hedge collateral we would be required to post is $7.8 million. We are required to maintain a foreigncurrency hedge at 100 yen per dollar under the agreements governing the PhaRMA Notes. Green Cross . In June 2006, we entered into an agreement with Green Cross to develop and commercialize peramivir in Korea. Under the terms of theagreement, Green Cross is responsible for all development, regulatory, and commercialization costs in Korea. We received a one-time license fee of $250,000. Thelicense provides that we will share in profits resulting from the sale of peramivir in Korea, including the sale of peramivir to the Korean government for stockpilingpurposes. Furthermore, Green Cross will pay us a premium over its cost to supply peramivir for development and any future marketing of peramivir products inKorea. Both parties have the right to terminate in the event of an uncured material breach. In the event of termination, all rights, data, materials, products and otherinformation would be transferred to us. 11 In August 2010, we announced that Green Cross had received marketing and manufacturing approval from the Korean Food & Drug Administration for i.v.peramivir, under the commercial name PERAMIFLU ® . PERAMIFLU is intended to treat patients with influenza A & B viruses, including pandemic H1N1 andavian influenza. Green Cross received the indication of single dose administration of 300 mg i.v. peramivir. Other Peramivir Collaborations . In addition to our collaborations with Shionogi and Green Cross, in March 2011 we entered into an arrangement withNeopharm Scientific Limited, granting certain commercial and distribution rights for peramivir in Israel. Mundipharma . In February 2006, we entered into an exclusive, royalty bearing right and license agreement with Mundipharma for the development andcommercialization of forodesine, a PNP inhibitor, for use in oncology (the “Original Agreement”). Under the terms of the Original Agreement, Mundipharmaobtained rights to forodesine in markets across Europe, Asia, and Australasia in exchange for a $10.0 million up-front payment. In addition, Mundipharmacontributed $10.0 million of the documented out-of-pocket development costs incurred by us in respect of the current and planned trials as of the effective date ofthe agreement, and Mundipharma would conduct additional clinical trials at their own cost up to a maximum of $15.0 million. The Original Agreement providedfor the possibility of future event payments totaling $155.0 million for achieving specified development, regulatory and commercial events (including certain saleslevel amounts following a product’s launch) for certain indications. In addition, the Original Agreement provided that we would receive royalties (ranging fromsingle digits to mid-teens) based on a percentage of net product sales, which varies depending upon when certain indications receive NDA approval in a majormarket country and can vary by country depending on the patent coverage or sales of generic compounds in a particular country. Generally, all payments under theOriginal Agreement were nonrefundable and non-creditable, but they are subject to audit. We licensed forodesine and other PNP inhibitors from AECOM/IRL andwill owe sublicense payments to AECOM/IRL on all milestone payments and royalties received by us from Mundipharma. On November 11, 2011, we entered into the Amended and Restated Agreement with Mundipharma (the “Amended and Restated Agreement”). Under theterms of this Amended and Restated Agreement, Mundipharma obtained worldwide rights to forodesine in the field of oncology. Mundipharma will control thedevelopment and commercialization of forodesine and assume all future development and commercialization costs. The Amended and Restated Agreementprovides for the possibility of future event payments totaling $15.0 million for achieving specified regulatory events for certain indications. In addition, theAmended and Restated Agreement provides that we will receive tiered royalties ranging from mid- to high-single digit percentages of net product sales in eachcountry where forodesine is sold by Mundipharma. These royalties are subject to downward adjustments based on the then-existing patent coverage and/or theavailability of generic compounds in each country. Generally, all payments under the Amended and Restated Agreement are nonrefundable and non-creditable, butthey are subject to audit. Mundipharma will also have a right of exclusive negotiations with us for a limited period of time if they initiate negotiations for a specified backup PNPinhibitor. Otherwise, they will be able to participate in the same negotiations process we enter into with another company for the backup PNP inhibitor. TheAmended and Restated Agreement will continue for the commercial life of the licensed products, but may be terminated by either party following an uncuredmaterial breach by the other party or in the event the pre-existing third party license with AECOM/IRL expires. It may be terminated by Mundipharma upon60 days written notice without cause or under certain other conditions as specified in the Amended and Restated Agreement. If Mundipharma terminates theAmended and Restated Agreement, Mundipharma would no longer have any rights in forodesine and the rights would revert back to us; provided, however, that inthe event the we determine to subsequently use the data developed under the Amended and Restated Agreement for development and commercialization offorodesine in the field of oncology, then we would have to pay Mundipharma 150% of the cost of such data for such use. Albert Einstein College of Medicine of Yeshiva University and Industrial Research, Ltd. (“AECOM” and “IRL” respectively) . In June 2000, we licensed aseries of potent inhibitors of PNP from AECOM and IRL, (collectively, the “Licensors”). The lead product candidate from this collaboration is forodesine. Wehave obtained worldwide exclusive rights to develop and ultimately distribute it, or any other, product candidates that might arise from research on these inhibitors.We have the option to expand our license agreement with the Licensors to include other inventions in the field made by the investigators or employees of theLicensors. We agreed to use commercially reasonable efforts to develop these drugs. In addition, we have agreed to pay certain milestone payments for eachlicensed product (which range in the aggregate from $1.4 million to almost $4.0 million per indication) for future development of these inhibitors, single digitroyalties on net sales of any resulting product made by us, and to share approximately one quarter of future payments received from other third-party partners, ifany. In addition, we have agreed to pay annual license fees, which can range from $150,000 to $500,000, that are creditable against actual royalties and otherpayments due to the Licensors. This agreement may be terminated by us at any time by giving 60 days advance notice or in the event of material uncured breach bythe Licensors. In May 2010, we amended the license agreement through which we obtained worldwide exclusive rights to develop and ultimately distribute any productcandidates that might arise from research on a series of PNP inhibitors, including forodesine. Under the terms of the amendment, the Licensors agreed to accept areduction of one-half in the percentage of future payments received from third-party sub licensees of the licensed PNP inhibitors that must be paid to the Licensors.This reduction does not apply to (i) any milestone payments we may receive in the future under our license agreement with Mundipharma and (ii) royaltiesreceived from its sub licensees in connection with the sale of licensed products, for which the original payment rate will remain in effect. The rate of royaltypayments to the Licensors based on net sales of any resulting product made by us remains unchanged. At our sole option and subject to certain agreed uponconditions, any future non-royalty payments due to be paid by us to the Licensors under the license agreement may be made either in cash, in shares of ourcommon stock, or in a combination of cash and shares. 12 On November 17, 2011, we further amended our agreements with the Licensors whereby the Licensors agreed to accept a reduction of one-half in thepercentage of Net Proceeds (as defined in the license agreement) received by us under our Amended and Restated Agreement with Mundipharma that will be paidto AECOM/IRL. On June 19, 2012, we further amended our agreements with the Licensors whereby the parties clarified the definition of the field with respect to PNPinhibition and the Licensors agreed to grant an exclusive worldwide license of galidesivir to us for any antiviral use. The University of Alabama at Birmingham (“UAB”) . We currently have agreements with UAB for influenza neuraminidase and complement inhibitors.Under the terms of these agreements, UAB performed specific research for us in return for research payments and license fees. UAB has granted us certain rightsto any discoveries in these areas resulting from research developed by UAB or jointly developed with us. We have agreed to pay single digit royalties on sales ofany resulting product and to share in future payments received from other third-party partners. We have completed the research under the UAB agreements. Thesetwo agreements have initial 25-year terms, are automatically renewable for five-year terms throughout the life of the last patent and are terminable by us upon threemonths’ notice and by UAB under certain circumstances. Upon termination both parties shall cease using the other parties’ proprietary and confidentialinformation and materials, the parties shall jointly own joint inventions and UAB shall resume full ownership of all UAB licensed products. There is currently noactivity between us and UAB on these agreements, but when we license this technology, such as in the case of the Shionogi and Green Cross agreements, orcommercialize products related to these programs, we will owe sublicense fees or royalties on amounts it receives. Government Contracts U.S. Department of Health and Human Services (“BARDA/HHS”) . In January 2007, BARDA/HHS awarded us a $102.6 million four-year contract for theadvanced development of peramivir for the treatment of influenza. During 2009, peramivir clinical development shifted to focus on intravenous delivery and thetreatment of hospitalized patients. To support this focus, a September 2009 contract modification was awarded to extend the i.v. peramivir program and to increasefunding by $77.2 million. On February 24, 2011, we announced that BARDA/HHS had awarded us a $55.0 million contract modification, intended to fundcompletion of the Phase 3 development of i.v. peramivir for the treatment of patients hospitalized with influenza. That contract modification brought the totalcontract award from BARDA/HHS to $234.8 million and provided funding to support the filing of an NDA to seek regulatory approval for i.v. peramivir in theU.S. In December 2013, we submitted an NDA filing for i.v. peramivir to the FDA and the NDA was approved in December 2014. The BARDA/HHS contractexpired on June 30, 2014 according to its terms. On March 31, 2015, we announced that BARDA/HHS awarded us a contract for the continued development of galidesivir as a potential treatment fordiseases caused by RNA pathogens, including filoviruses. This BARDA/HHS contract has a potential value of $39.1 million if all contract options are exercised.As of December 31, 2016, a total of $20.6 million has been awarded under exercised options within this contract. National Institute of Allergy and Infectious Diseases (“NIAID/HHS”) . In September 2013, NIAID/HHS contracted with us for the development ofgalidesivir as a treatment for Marburg, and subsequently, Ebola virus disease. NIAID/HHS, part of the National Institutes of Health, made an initial award of $5.0million to us. All options under this contract have been awarded and the total contract value is $39.5 million. The goals of this contract, including amendments, areto file IND applications for i.v. and i.m. galidesivir for the treatment of Marburg virus disease and other hemorrhagic fever viruses, to study galidesivir as atreatment for Ebola virus disease and to conduct a Phase 1 human clinical trial. The contracts with BARDA/HHS and NIAID/HHS are cost-plus-fixed-fee contracts. That is, we are entitled to receive reimbursement for all costs incurredin accordance with the contracts provisions that are related to the development of peramivir and galidesivir plus a fixed fee, or profit. BARDA/HHS andNIAID/HHS will make periodic assessments of progress and the continuation of the contract is based on our performance, the timeliness and quality ofdeliverables, and other factors. The government has rights under certain contract clauses to terminate these contracts. These contracts are also terminable by thegovernment at any time for breach or without cause. Patents and Proprietary Information Our success will depend in part on our ability to obtain and enforce patent protection for our products, methods, processes and other proprietarytechnologies, preserve our trade secrets, and operate without infringing on the proprietary rights of other parties, both in the United States and in other countries.We own or have rights to certain proprietary information, proprietary technology, issued and allowed patents and patent applications which relate to compounds weare developing. We actively seek, when appropriate, protection for our products, proprietary technology and proprietary information by means of U.S. and foreignpatents, trademarks and contractual arrangements. In addition, we rely upon trade secrets and contractual arrangements to protect certain of our proprietaryinformation, proprietary technology and products. 13 The patent positions of companies like ours are generally uncertain and involve complex legal and factual questions. Our ability to maintain and solidify ourproprietary position for our technology will depend on our success in obtaining effective patent claims and enforcing those claims once granted. We do not knowwhether any of our patent applications or those patent applications that we license will result in the issuance of any patents. Our issued patents and those that mayissue in the future, or those licensed to us, may be challenged, invalidated, rendered unenforceable or circumvented, which could limit our ability to stopcompetitors from marketing related products or the length of term of patent protection that we may have for our products. In addition, the rights granted under anyissued patents may not provide us with competitive advantages against competitors with similar compounds or technology. Furthermore, our competitors mayindependently develop similar technologies or duplicate any technology developed by us in a manner that does not infringe our patents or other intellectualproperty. Because of the extensive time required for development, testing and regulatory review of a potential product, it is possible that, before any of our productcandidates or those developed by our partners can be commercialized, any related patent may expire or remain in force for only a short period followingcommercialization, thereby reducing any advantage of the patent. As of December 31, 2016, we have been issued approximately 15 U.S. patents that expire between 2017 and 2034 and that relate to our HAE programcompounds, neuraminidase inhibitor compounds, BSAV compounds and PNP compounds. We have licensed a number of compounds protected by certaincomposition of matter patents from AECOM and IRL, plus additional manufacturing patents, totaling 14 additional U.S. patents that expire between 2017 and2029. Additionally, we have approximately 13 Patent Cooperation Treaty or U.S. patent applications pending related to HAE program compounds, neuraminidaseinhibitor compounds, BSAV compounds and PNP compounds. Our pending applications may not result in issued patents, our patents may not cover the products ofinterest or may not be enforceable in all, or any jurisdictions and our patents may not provide us with sufficient protection against competitive products orotherwise be commercially viable. After expiration of composition of matter patents for our products and product candidates, we may rely on data exclusivity, or insome cases, method of use patents. The enforceability of these patents varies from jurisdiction to jurisdiction and may not be allowed or enforceable in someterritories where we may seek approval. We may not have the funds to continue patent prosecution or to defend all of our existing patents in our current patentestate and may selectively abandon patents or patent families worldwide or in certain territories. Our success is also dependent upon the skills, knowledge and experience of our scientific and technical personnel, none of which is patentable. To helpprotect our rights, we require all employees, consultants, advisors and partners to enter into confidentiality agreements, which prohibit the disclosure ofconfidential information to anyone outside of BioCryst and, where possible, require disclosure and assignment to us of their ideas, developments, discoveries andinventions. These agreements may not provide adequate protection for our trade secrets, know-how or other proprietary information in the event of anyunauthorized use or disclosure or the lawful development by others of such information. Competition The pharmaceutical and biotechnology industries are intensely competitive. Many companies, including biotechnology, chemical and pharmaceuticalcompanies, are actively engaged in activities similar to ours, including research, development, and commercialization of drugs for the treatment of rare medicalconditions. Many of these companies have substantially greater financial and other resources, larger research and development staffs, and more extensivecommercial and manufacturing organizations than we do. In addition, many have considerable experience in preclinical testing, clinical trials and other regulatoryapproval procedures. In addition, there are also academic institutions, governmental agencies and other research organizations who conduct research in areas inwhich we are working. We expect to encounter significant competition for any of the pharmaceutical products we plan to develop. Companies that successfullycomplete clinical trials, obtain required regulatory approvals and commence commercial marketing and sales of their products may achieve a significantcompetitive advantage. Antivirals : The pharmaceutical market for products that prevent or treat influenza is very competitive. Key competitive factors for RAPIVAB (peramivirinjection) include, among others, efficacy, ease of use, safety, price and cost-effectiveness, storage and handling requirements and reimbursement. A number ofneuraminidase inhibitors are currently available in the U.S. and/or other counties, including Japan, for the prevention or treatment of influenza, including seasonalflu vaccines and F. Hoffmann-La Roche Ltd.’s (“Roche”) TAMIFLU ® (oseltamivir), generic oseltamivir, GlaxoSmithKline plc’s (“GSK”) RELENZA ® andDaiichi Sankyo Co., Ltd.’s INAVIR ® . In addition, FUJIFILM Corporation’s favipiravir, a polymerase inhibitor, is approved in Japan. Roche’s neuraminidaseinhibitor is also approved for prophylaxis of influenza. In January 2011, GSK announced initiation of a multi-country Phase 3 study of i.v. zanamivir (the same active ingredient as in RELENZA) in hospitalizedpatients with influenza. The GSK study was completed during the 2014-2015 flu season. In addition to these companies with neuraminidase inhibitors, there areother companies working to develop additional antiviral drugs to be used against various strains of influenza. Currently, there are a number of other companiesdeveloping potential new influenza therapies. Various government entities throughout the world are offering incentives, grants and contracts to encourageadditional investment into preventative and therapeutic agents against influenza, which may have the effect of further increasing the number of our competitorsand/or providing advantages to certain competitors. Galidesivir is a product candidate in our BSAV research program and is currently being developed under contracts with NIAID/HHS and BARDA/HHS.The objective of our BSAV program is to develop galidesivir as a broad-spectrum therapeutic for viruses that pose a threat to national health and security. The U.S.Government is investing in a number of programs intended to address gaps in its medical countermeasure plan. Therapeutic products with potentially promisingdata to treat Ebola include FUJIFILM Corporation’s favipiravir (polymerase inhibitor), Tekmira Pharmaceuticals Corporation’s TKM-Ebola (RNAi interferencebased) and Mapp Biopharmaceutical, Inc.’s ZMapp (antibody-based). Both TKM-Ebola and ZMapp have been used in Ebola patients. Gilead Sciences, Incannounced in October 2015 that it had provided the investigational compound, GS-5734, to two patients with Ebola for compassionate use. 14 HAE : HAE is an autosomal dominant disease characterized by painful, unpredictable, recurrent attacks of inflammation affecting the hands, feet, face,abdomen, urogenital tract, and the larynx. The inflammation can be disfiguring, debilitating, or in the case of laryngeal attacks, life-threatening. Prevalence forHAE is uncertain but is estimated to be approximately 1 case per 50,000 persons without known differences among ethnic groups and is caused by deficient (TypeI) or dysfunctional (Type II) levels of C1-Inhibitor (“C1-INH”), a naturally occurring molecule that is known to inhibit kallikrein, bradykinin, and other serineproteases in the blood. If left untreated, HAE can result in a mortality rate as high as 40% primarily due to upper airway obstruction. There are a number oflicensed therapies for HAE, including the following: •C1-INH therapy is available as an acute therapy (Berinert ® ) and as a prophylactic therapy (Cinryze ® ). These therapies are availableintravenously and work by replacing the missing or malfunctioning C1-INH protein in patients. Recominant C1-INH (Ruconest ® ) is alsoavailable as an acute therapy. •Kallikrein Inhibition - Kalbitor ® (ecallantide) is a specific recombinant plasma kallikrein inhibitor that halts the production of bradykinin and canbe dosed subcutaneously in an inpatient setting. •Bradykinin receptor antagonist - Firazyr ® (icatibant) is a competitive antagonist of the bradykinin B2 receptor. Firazyr is approved for thetreatment of acute attacks and is administered by subcutaneous administration. •Other medications - Prophylactic administration of synthetic attenuated androgens (generically available as danazol or stanozolol) has beenutilized to reduce the frequency or severity of attacks. However, long-term use of danazol or stanozolol may result in virilization and arterialhypertension. Six-month liver function tests, annual lipid profiles, and biennial hepatic ultrasound are recommended because these medicationsincrease production of C1-INH in the liver. In addition to BCX7353 and our other second generation compounds, there are a number of other HAE therapies in development. These include aprophylactic plasma derived C1-INH delivered by subcutaneous injection developed by CSL (Biologics License Application accepted for review by FDA inAugust 2016); SHP643 (DX2930), a monoclonal antibody administered by subcutaneous injection for prophylactic treatment of HAE in Phase 3 (Shire PLC);ISIS-PKK, a RNA-targeted antisense drug to inhibit prekallikrein for prophylactic treatment of HAE in Phase 1 (ISIS Pharmaceuticals, Inc.); and one oralkallikrein inhibitor being developed by KalVista (Phase 1 commenced in 2016). In order to compete successfully in these and other therapeutic areas, we must develop proprietary positions in patented drugs for therapeutic markets thathave not been satisfactorily addressed by conventional research strategies and, in the process, expand our expertise in structure-based drug design. Our productcandidates, even if successfully tested and developed, may not be adopted by physicians over other products and may not offer economically feasible alternativesto other therapies. Research and Development We initiated our research and development activities in 1986. We have assembled a scientific research staff with expertise in a broad base of advancedresearch technologies including protein biochemistry, X-ray crystallography, chemistry and pharmacology. Our research facilities, located in Birmingham,Alabama, include protein biochemistry and organic synthesis laboratories, testing facilities, X-ray crystallography, computer and graphics equipment and facilitiesto make product candidates on a small scale for early stage clinical trials. During the years ended December 31, 2016, 2015 and 2014, our research anddevelopment expenses were $61.0 million, $72.8 million and $51.8 million, respectively. Compliance We conduct our business in an ethical, fair, honest and lawful manner. We act responsibly, respectfully and with integrity in our relationships with patients,health care professionals, collaborators, governments, regulatory entities, stockholders, suppliers and vendors. In order to ensure compliance with applicable laws and regulations, our Chief Financial Officer, General Counsel and Vice President of Human Resourcesoversee compliance training, education, auditing and monitoring; enforce disciplinary guidelines for any infractions of our corporate polices; implement newpolicies and procedures; respond to any detected issues; and undertake corrective action procedures. Our controls address compliance with laws and regulationsthat govern public pharmaceutical companies including, but not limited to, the following: federal and state law, such as the Sarbanes-Oxley Act of 2002 and theU.S. Foreign Corrupt Practices Act of 1977; NASDAQ listing requirements; the regulations of the Financial Industry Regulatory Authority; the Securities andExchange Commission (“SEC”); the FDA; and the United States Department of Health and Human Services. Our standard operating procedures are designed toprovide a framework for corporate governance in accordance with ethical standards and best legal practices. Government Regulation The FDA regulates the pharmaceutical and biotechnology industries in the U.S., and our product candidates are subject to extensive and rigorous domesticgovernment regulations prior to commercialization. The FDA regulates, among other things, the development, testing, manufacture, safety, efficacy, record-keeping, labeling, storage, approval, advertising, promotion, sale and distribution of pharmaceutical products. In foreign countries, our products are also subject toextensive regulation by foreign governments. These government regulations will be a significant factor in the production and marketing of any pharmaceuticalproducts that we develop. Failure to comply with applicable FDA and other regulatory requirements at any stage during the regulatory process may subject us tosanctions, including: 15 • delays; • warning letters; • fines; • product recalls or seizures; • injunctions; • penalties; • refusal of the FDA to review pending market approval applications or supplements to approval applications; • total or partial suspension of production; • civil penalties; • withdrawals of previously approved marketing applications; and • criminal prosecutions. The regulatory review and approval process is lengthy, expensive and uncertain. Before obtaining regulatory approvals for the commercial sale of anyproducts, we or our partners must demonstrate that our product candidates are safe and effective for use in humans. The approval process takes many years,substantial expenses may be incurred and significant time may be devoted to clinical development. Before testing potential product candidates in humans, we carry out laboratory and animal studies to determine safety and biological activity. Aftercompleting preclinical trials, we must file an IND, including a proposal to begin clinical trials, with the FDA. Thirty days after filing an IND, a Phase 1 humanclinical trial can start, unless the FDA places a hold on the trial. Clinical trials to support a NDA are typically conducted in three sequential phases, but the phases may overlap. Phase 1—During Phase 1, the initial introduction of the drug into healthy volunteers, the drug is tested to assess metabolism, pharmacokinetics andpharmacological actions and safety, including side effects associated with increasing doses. Phase 2—Phase 2 usually involves trials in a limited patient population to: (1) assess the efficacy of the drug in specific, targeted indications; (2) assessdosage tolerance and optimal dosage; and (3) identify possible adverse effects and safety risks. Phase 3 (pivotal)—If a compound is found to be potentially effective and to have an acceptable safety profile in Phase 2 evaluations, Phase 3 clinical trials,also called pivotal studies, major studies or advanced clinical trials, are undertaken to further demonstrate clinical efficacy and to further test for safety within anexpanded patient population at geographically dispersed clinical trial sites. In general, the FDA requires that at least two adequate and well-controlled Phase 3clinical trials be conducted. Initiation and completion of the clinical trial phases are dependent on several factors including things that are beyond our control. For example, the clinicaltrials cannot begin at a particular site until that site receives approval from its Institutional Review Board (“IRB”), which reviews the protocol and relateddocuments. This process can take from several weeks to several months. In addition, clinical trials are dependent on patient enrollment, but the rate at whichpatients enroll in the study depends on: • willingness of investigators to participate in a study; • ability of clinical sites to obtain approval from their IRB; • the availability of the required number of eligible subjects to be enrolled in a given trial; • the availability of existing or other experimental drugs for the disease we intend to treat; • the willingness of patients to participate; and • the patients meeting the eligibility criteria. Delays in planned patient enrollment may result in increased expense and longer development timelines. 16 After successful completion of the required clinical testing, generally an NDA is submitted. Upon receipt of the NDA, the FDA will review the applicationfor completeness. Within 60 days, the FDA will determine if the application is sufficiently complete to warrant full review and will consider the application “filed”at that time. Also upon receipt of the application, the FDA will assign a review priority to the application. Priority review applications are usually reviewed within8 months; standard review applications are usually reviewed within 12 months. The FDA will usually refer NDAs for new molecular entities to an appropriateadvisory committee for review and evaluation in regards to providing a recommendation as to whether the application should be approved. The FDA is not boundto follow the recommendation of an advisory committee. Following the review of the application, which may include requests for additional information from the sponsor and results from inspections ofmanufacturing and clinical sites, the FDA will issue an “action letter” on the application. The action letter will either be an “approval letter,” in which case theproduct may be lawfully marketed in the United States, or a “complete response letter.” A complete response letter will state that the FDA cannot approve theNDA in its present form and, usually, will describe all of the specific deficiencies that the FDA has identified in the application. The complete response letter,when possible, will include the FDA’s recommended actions to place the application in a condition for approval. Deficiencies can be minor (e.g., labeling changes)or major (e.g., requiring additional clinical trials). A complete response letter may also be issued before the FDA conducts the required facility inspection and/orreviews labeling, leaving the possibility that additional deficiencies in the original NDA could be subsequently cited. An applicant receiving a complete responseletter is permitted to resubmit the NDA addressing the identified deficiencies (in which case a new two or six month review cycle will begin), or withdraw theNDA. The FDA may consider a failure to take action within one year of a complete response letter to be a request to withdraw, unless the applicant has requestedan extension of time in which to resubmit. If the FDA approves an NDA, the marketing of the product will be limited to the particular disease states and conditionsof use that are described in the product label. We and all of our contract manufacturers are also required to comply with the applicable FDA current Good Manufacturing Practice, or cGMP, regulationsduring clinical development and to ensure that the product can be consistently manufactured to meet the specifications submitted in an NDA. The cGMPregulations include requirements relating to product quality as well as the corresponding maintenance of records and documentation. Manufacturing facilities mustbe approved by the FDA before they can be used to manufacture our products. Based on an inspection, the FDA determines whether manufacturing facilities are incompliance with applicable regulations. Manufacturing facilities in non-United States countries that are utilized to manufacture drugs for distribution into theUnited States are also subject to inspection by the FDA. Additionally, failure to comply with local regulatory requirements could affect production and availabilityof product in relevant markets. Human Resources As of January 31, 2017, we had approximately 65 employees, of whom approximately 45 were engaged in the research and development function of ouroperations. Our research and development staff, 25 of whom hold Ph.D. or M.D. degrees, have diversified experience in biochemistry, pharmacology, X-raycrystallography, synthetic organic chemistry, computational chemistry, medicinal chemistry, clinical development and regulatory affairs. Our employees are not represented by any collective bargaining agreements, and we have never experienced a work stoppage. Employees are required toexecute confidentiality and assignment of intellectual property agreements. We consider our relations with our employees to be satisfactory. Available Information Our website address is www.biocryst.com. We make available, free of charge, at our website our Annual Reports on Form 10-K, Quarterly Reports onForm 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon asreasonably practicable after we electronically file such material with, or furnish it to, the SEC. We also make available at our website copies of our audit committeecharter, compensation committee charter, corporate governance and nominating committee charter and our code of business conduct, which applies to all ouremployees as well as the members of our Board of Directors. Any amendment to, or waiver from, our code of business conduct will be posted on our website. Financial Information For information related to our revenues, profits, net loss and total assets, in addition to other financial information, please refer to the Financial Statementsand Notes to Financial Statements contained in this Annual Report. Financial information about revenues derived from foreign countries is included in Note 1 tothe Financial Statements contained in this Annual Report. 17 ITEM 1A.RISK FACTORS An investment in our stock involves risks. You should carefully read this entire report and consider the following uncertainties and risks, which mayadversely affect our business, financial condition or results of operations, along with all of the other information included in our other filings with the Securitiesand Exchange Commission, before deciding to buy our common stock. Risks Relating to Our Business We have incurred losses since our inception, expect to continue to incur such losses, and may never be profitable. Since our inception, we have not achieved sustained profitability. We expect to incur additional losses for the foreseeable future, and our losses couldincrease as our research and development efforts progress. We expect that such losses will fluctuate from quarter to quarter and losses and fluctuations may besubstantial. To become profitable, we, or our collaborative partners, must successfully manufacture and develop product candidates, receive regulatory approval, andsuccessfully commercialize and/or enter into profitable agreements with other parties. It could be several years, if ever, before we receive significant revenue fromany current or future license agreements or revenues directly from product sales. Because of the numerous risks and uncertainties associated with developing our product candidates and their potential for commercialization, we are unableto predict the extent of any future losses. Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis.If we are unable to achieve and sustain profitability, the market value of our common stock will likely decline. Our success depends upon our ability to advance our products through the various stages of development, especially through the clinical trial process. To receive the regulatory approvals necessary for the sale of our product candidates, we or our partners must demonstrate through preclinical studies andclinical trials that each product candidate is safe and effective. The development process and related regulatory process are complex and uncertain. Because of thecost and duration of clinical trials, we may decide to discontinue development of product candidates that are unlikely to show good results in the clinical trials,unlikely to help advance a product to the point of a meaningful collaboration, or unlikely to have reasonable commercial potential. We may suffer significantsetbacks in pivotal pre-clinical studies and clinical trials (e.g. galidesivir, BCX7353, other kallikrein inhibitors and our other rare disease product candidates), evenafter earlier clinical trials show promising results. The development of our product candidates, including our clinical trials, may not be adequately designed orexecuted, which could affect the potential outcome and analysis of study results. Any of our product candidates may produce undesirable side effects in humans.The pre-clinical and clinical data from our product candidates could cause us or regulatory authorities to interrupt, delay, modify or halt preclinical or clinical trialsof a product candidate. Undesirable or inconclusive data or side effects in humans could also result in the FDA or foreign regulatory authorities refusing to approvethe product candidate for any targeted indications. In addition, the FDA or other regulatory agencies may determine that study data from our product candidatesnecessitates additional studies or study designs which differ from our planned development strategy, and regulatory agencies may also require patient monitoringand testing or may implement restrictions or other conditions on our development activities, any of which could materially impact the cost and timing of ourplanned development strategy. We, our partners, the FDA or foreign regulatory authorities may suspend or terminate clinical trials at any time if we or they believethe trial participants face unacceptable health risks. Clinical trials may fail to demonstrate that our product candidates are safe or effective and have acceptablecommercial viability. Regulatory authorities may interrupt, delay or halt clinical trials for a product candidate for any number of reasons. Our ability to successfully complete clinical trials is dependent upon many factors, including but not limited to: •our ability to find suitable clinical sites and investigators to enroll patients; •the ability to maintain contact with patients to provide complete data after treatment; •our product candidates may not prove to be either safe or effective; •clinical protocols or study procedures may not be adequately designed or followed by the investigators; •formulation improvements may not work as expected, which could negatively impact commercial demand for our product candidates; •manufacturing or quality control problems could affect the supply of product candidates for our trials; and •delays or changes in our planned development strategy, the regulations or guidelines, or other unexpected conditions or requirements of governmentagencies. 18 Clinical trials are lengthy and expensive. We or our partners incur substantial expense for, and devote significant time to, preclinical testing and clinicaltrials, yet we cannot be certain that the tests and trials will ever result in the commercial sale of a product. For example, clinical trials require adequate supplies ofdrug and sufficient patient enrollment. Lack of adequate drug supply or delays in patient enrollment can result in increased costs and longer development times.Even if we or our partners successfully complete clinical trials for our product candidates, we or our partners might not file the required regulatory submissions in atimely manner and may not receive regulatory approval for the product candidates. We focus on rare diseases, which may create additional risks and challenges. Because we focus on developing drugs as treatments for rare diseases, we may seek orphan drug, breakthrough therapy or fast track designations for ourproduct candidates in the United States or the equivalent designations elsewhere in the world. Often, regulatory agencies have broad discretion in determiningwhether or not to grant such designations. We cannot guarantee that we will be able to receive orphan drug status from the FDA or equivalent regulatorydesignations elsewhere. We also cannot guarantee that we will obtain breakthrough therapy or fast track designation, which may provide certain potential benefitssuch as more frequent meetings with the FDA to discuss the development plan, intensive guidance on an efficient drug development program, and potentialeligibility for rolling review or priority review. Even if we are successful in obtaining any such designation by the FDA or other regulatory agency for our productcandidates, such designations may not lead to faster development or regulatory review or approval, and it does not increase the likelihood that our productcandidates will receive marketing approval. We may not be able to obtain or maintain such designations for our product candidates, and our competitors mayobtain these designations for their product candidates, which could impact our ability to develop and commercialize our product candidates or compete with suchcompetitors, which may adversely impact our business, financial condition or results of operations. Although we have received Sakigake designation for BCX7353 in Japan, we may not experience a faster development, review or approval processcompared to the conventional process. Our clinical trials may not adequately show that our product candidates are safe or effective. Progression of our product candidates through the clinical development process is dependent upon our trials indicating our product candidates have adequatesafety and efficacy in the patients being treated by achieving pre-determined safety and efficacy endpoints according to the clinical trial protocols. Failure toachieve any of these endpoints in any of our programs, including BCX7353, and our other rare disease product candidates, could result in delays in our trials orrequire the performance of additional unplanned trials. This could result in delays in the development of our product candidates and could result in significantunexpected costs or the termination of programs. If our development collaborations with third parties, such as our development partners and contract research organizations, fail, the development of ourproduct candidates will be delayed or stopped. We rely heavily upon third parties for many important stages of our product candidate development, including but not limited to: •discovery of compounds that cause or enable biological reactions necessary for the progression of the disease or disorder, called enzyme targets; •licensing or designing of enzyme inhibitors for development as product candidates; •execution of certain preclinical studies and late-stage development for our compounds and product candidates; •management of our clinical trials, including medical monitoring and data management; •execution of additional toxicology studies that may be required to obtain approval for our product candidates; •formulation improvement strategies and methods; and •manufacturing the starting materials and drug substance required to formulate our products and the product candidates to be used in our clinical trials,toxicology studies and any potential commercial product. Our failure to engage in successful collaborations at any one of these stages would greatly impact our business. If we do not license enzyme targets orinhibitors from academic institutions or from other biotechnology companies on acceptable terms, our drug development efforts would suffer. Similarly, if thecontract research organizations that conduct our initial or late-stage clinical trials, conduct our toxicology studies, manufacture our starting materials, drugsubstance and product candidates or manage our regulatory function breached their obligations to us or perform their services inconsistent with industry standardsand not in accordance with the required regulations, this would delay or prevent both the development of our product candidates and the availability of anypotential commercial product. If we lose our relationship with any one or more of these parties, we could experience a significant delay in both identifying another comparable providerand then contracting for its services. We may be unable to retain an alternative provider on reasonable terms, if at all. Even if we locate an alternative provider, it islikely that this provider may need additional time to respond to our needs and may not provide the same type or level of service as the original provider. Inaddition, any provider that we retain will be subject to applicable FDA current Good Laboratory Practices (“cGLP”), current Good Manufacturing Practices(“cGMP”) and current Good Clinical Practices (“cGCP”), and comparable foreign standards. We do not have control over compliance with these regulations bythese providers. Consequently, if these practices and standards are not adhered to by these providers, the development and commercialization of our productcandidates could be delayed. If any of the foregoing risks are realized, our business, financial condition and results of operations could be materially adverselyaffected. 19 Because we have limited manufacturing experience, we depend on third-party manufacturers to manufacture our product, product candidates and thematerials for our product candidates. Often, especially early in the development and commercialization process, we have only one source formanufacturing. If we cannot rely on existing third-party manufacturers, we will be required to incur significant costs and potential delays in finding newthird-party manufacturers. We have limited manufacturing experience and only a small scale manufacturing facility. We currently rely upon a very limited number of third-partymanufacturers to manufacture the materials required for our product, product candidates and most of the preclinical and clinical quantities of our productcandidates. We depend on these third-party manufacturers to perform their obligations in a timely manner and in accordance with applicable governmentalregulations. Our third-party manufacturers, which may be the only manufacturer we have engaged for a particular product, may encounter difficulties with meetingour requirements including but not limited to problems involving: •inconsistent production yields; •product liability claims or recalls of commercial product; •difficulties in scaling production to commercial and validation sizes; •interruption of the delivery of materials required for the manufacturing process; •scheduling of plant time with other vendors or unexpected equipment failure; •potential catastrophes that could strike their facilities or have an effect on infrastructure; •potential impurities in our drug substance or products that could affect availability of product for our clinical trials or future commercialization; •poor quality control and assurance or inadequate process controls; and •lack of compliance or cooperation with regulations and specifications or requests set forth by the FDA or other foreign regulatory agencies, particularlyassociated with peramivir, BCX7353, galidesivir and our early stage compounds. These contract manufacturers may not be able to manufacture the materials required for our product candidates at a cost or in quantities necessary to makethem commercially viable. We also have no control over whether third-party manufacturers breach their agreements with us or whether they may terminate ordecline to renew agreements with us. To date, our third-party manufacturers have met our manufacturing requirements, but they may not continue to do so.Furthermore, changes in the manufacturing process or procedure, including a change in the location where the drug is manufactured or a change of a third-partymanufacturer, may require prior review and approval in accordance with the FDA’s cGMP and comparable foreign requirements. This review may be costly andtime-consuming and could delay or prevent the launch of a product. The FDA or similar foreign regulatory agencies may at any time implement new standards, orchange their interpretation and enforcement of existing standards for manufacture, packaging or testing of products. If we or our contract manufacturers are unableto comply, we or they may be subject to regulatory action, civil actions or penalties any of which could be costly to the Company and could result in a delay orshortage of product. If we are unable to maintain current manufacturing or other contract relationships, or enter into new agreements with additional manufacturers oncommercially reasonable terms, or if there is poor manufacturing performance or failure to comply with any regulatory agency on the part of any of our third-partymanufacturers, we may not be able to complete development of, seek timely approval of, or market, our product candidates. Our raw materials, drug substances, and product candidates are manufactured by a limited group of suppliers, including some at a single facility. If any ofthese suppliers were unable to produce these items, this could significantly impact our supply of product candidate material for further preclinical testing andclinical trials. We face intense competition, and if we are unable to compete effectively, the demand for our products, if any, may be reduced. The biotechnology and pharmaceutical industries are highly competitive and subject to rapid and substantial technological change. There are manycompanies seeking to develop products for the same indications that we currently target. Our competitors in the United States and elsewhere are numerous andinclude, among others, major multinational pharmaceutical and chemical companies and specialized biotechnology firms. Most of these competitors have greaterresources than we do, including greater financial resources, larger research and development staffs and more experienced marketing and manufacturingorganizations. In addition, most of our competitors have greater experience than we do in conducting clinical trials and obtaining FDA and other regulatoryapprovals. Accordingly, our competitors may succeed in obtaining FDA or other regulatory approvals of product candidates more rapidly than we do. Companiesthat complete clinical trials, obtain required regulatory approvals, and commence commercial sale of their drugs before we do may achieve a significantcompetitive advantage, including patent and FDA exclusivity rights that would delay our ability to market products. We face, and will continue to face,competition in the licensing of potential product candidates for desirable disease targets licensing of desirable product candidates, and development and marketingof our product candidates from academic institutions, government agencies, research institutions and biotechnology and pharmaceutical companies. Competitionmay also arise from, among other things: 20 •other drug development technologies; •methods of preventing or reducing the incidence of disease, including vaccines; and •new small molecule or other classes of therapeutic agents. Developments by others may render our product candidates or technologies obsolete or noncompetitive. We are performing research on or developing products for the treatment of several rare disorders, including HAE, as well as developing broad spectrumantivirals for use as medical countermeasures. We expect to encounter significant competition for any of the pharmaceutical products we plan to develop.Companies that complete clinical trials, obtain required funding or government support, obtain required regulatory approvals and commence commercial sales orstockpiling orders of their products before their competitors may achieve a significant competitive advantage. Such is the case with the current neuraminidaseinhibitors marketed by GSK and Roche for influenza; CINRYZE ® , KALBITOR ® and FIRAZYR ® , marketed by Shire Pharmaceuticals, Inc. for HAE; andBERINERT ® , marketed by CSL for HAE. Therapeutic products with potentially promising data to treat Ebola include Mapp Biopharmaceutical, Inc.’s ZMapp(antibody-based) and Gilead Sciences, Inc.’s product currently under development (small molecule), both of which have been used in Ebola infected patients.Further, several pharmaceutical and biotechnology firms, including major pharmaceutical companies and specialized structure-based drug design companies, haveannounced efforts in the field of structure-based drug design and molecules in development in the fields of HAE and in other therapeutic areas where we havediscovery and development efforts ongoing. If one or more of our competitors’ products or programs are successful, the market for our products may be reduced oreliminated. Compared to us, many of our competitors and potential competitors have substantially greater: •capital resources; •research and development resources, including personnel and technology; •regulatory experience; •preclinical study and clinical testing experience; •manufacturing and marketing experience; and •production facilities. Any of these competitive factors could impede our funding efforts, render technology and product candidates noncompetitive or eliminate or reduce demandfor our product candidates. We face risks related to our government-funded programs; if BARDA/HHS or NIAID/HHS were to eliminate, reduce or delay funding from ourcontracts, this would have a significant negative impact on the programs associated with such funding and could have a significant negative impact onour revenues and cash flows. Our projections of revenues and incoming cash flows are substantially dependent upon BARDA/HHS and NIAID/HHS reimbursement for the costs relatedto our galidesivir program. If BARDA/HHS or NIAID/HHS were to eliminate, reduce or delay the funding for these programs or disallow some of our incurredcosts, we would have to obtain additional funding for continued development or regulatory registration for these product candidates or significantly reduce or stopthe development effort. In contracting with BARDA/HHS and NIAID/HHS, we are subject to various U.S. Government contract requirements, including general clauses for a cost-reimbursement research and development contract, which may limit our reimbursement or if we are found to be in violation could result in contract termination. Ifthe U.S. Government terminates any of its contracts with us for its convenience, or if we default by failing to perform in accordance with the contract schedule andterms, significant negative impact on our cash flows and operations could result. Our government contracts with BARDA/HHS and NIAID/HHS have special contracting requirements, which create additional risks of reduction or lossof funding. 21 We have completed work under a contract with BARDA/HHS for the development of our neuraminidase inhibitor, RAPIVAB. We also have entered intocontracts with BARDA/HHS and NIAID/HHS for the development of galidesivir as a treatment for diseases caused by RNA pathogens, including Marburg virusdisease and Ebola virus disease. In contracting with these government agencies, we are subject to various U.S. Government contract requirements, includinggeneral clauses for a cost-reimbursement research and development contract, which may limit our reimbursement or, if we are found to be in violation, could resultin contract termination. U.S. Government contracts typically contain a number of extraordinary provisions that would not typically be found in commercial contracts and which maycreate a disadvantage and additional risks to us as compared to competitors that do not rely on U.S. Government contracts. These risks include the ability of theU.S. Government to unilaterally: •terminate or reduce the scope of our contract with or without cause; •interpret relevant regulations (federal acquisition regulation clauses); •require performance under circumstances which may not be favorable to us; •require an in process review where the U.S. Government will review the project and its options under the contract; •control the timing and amount of funding, which impacts the development progress of our programs; and •audit and object to our contract-related costs and fees, including allocated indirect costs. Our government contracts with BARDA/HHS and NIAID/HHS have termination and audit provisions which create additional risks to us. The U.S. Government may terminate its contracts with us either for its convenience or if we default by failing to perform in accordance with the contractschedule and terms. Termination for convenience provisions generally enable us to recover only our costs incurred or committed, and settlement expenses andprofit on the work completed prior to termination. Termination does not permit these recoveries under default provisions. In the event of termination or uponexpiration of a contract, the U.S. Government may dispute wind-down and termination costs and may question prior expenses under the contract and deny paymentof those expenses. Should we choose to challenge the U.S. Government for denying certain payments under a contract, such a challenge could subject us tosubstantial additional expenses which we may or may not recover. Further, if the U.S. Government terminates its contracts with us for its convenience, or if wedefault by failing to perform in accordance with the contract schedule and terms, significant negative impact on our cash flows and operations could result. As a U.S. Government contractor, we are required to comply with applicable laws, regulations and standards relating to our accounting practices and aresubject to periodic audits and reviews. As part of any such audit or review, the U.S. Government may review the adequacy of, and our compliance with, ourinternal control systems and policies, including those relating to our purchasing, property, estimating, compensation and management information systems. Auditsconducted by the U.S. Government for the completed BARDA/HHS peramivir contract have been performed and concluded through fiscal 2009; all subsequentfiscal years are still open and auditable. Audits under the active BARDA/HHS and NIAID/HHS galidesivir contracts may occur at the election of the U.S.Government and have been concluded through fiscal 2013. Based on the results of its audits, the U.S. Government may adjust our contract-related costs and fees,including allocated indirect costs. This adjustment could impact the amount of revenues reported on a historic basis and could impact our cash flows under thecontracts prospectively. In addition, in the event BARDA/HHS or NIAID/HHS determines that certain costs and fees were unallowable or determines that theallocated indirect cost rate was higher than the actual indirect cost rate, BARDA/HHS or NIAID/HHS would be entitled to recoup any overpayment from us as aresult. In addition, if an audit or review uncovers any improper or illegal activity, we may be subject to civil and criminal penalties and administrative sanctions,including termination of our contracts, forfeiture of profits, suspension of payments, fines and suspension or prohibition from doing business with the U.S.Government. We could also suffer serious harm to our reputation if allegations of impropriety were made against us. In addition, under U.S. Governmentpurchasing regulations, some of our costs may not be reimbursable or allowed under our contracts. Further, as a U.S. Government contractor, we are subject to anincreased risk of investigations, criminal prosecution, civil fraud, whistleblower lawsuits and other legal actions and liabilities as compared to private sectorcommercial companies. If we fail to reach milestones or to make annual minimum payments or otherwise breach our obligations under our license agreements, our licensors mayterminate our agreements with them and seek additional remedies. If we are unable or fail to meet payment obligations, performance milestones relating to the timing of regulatory filings, product supply obligations, postapproval commitments for RAPIVAB, or development and commercial diligence obligations; are unable or fail to make milestone payments or material data usepayments in accordance with applicable provisions; or fail to pay the minimum annual payments under our respective licenses, our licensors may terminate theapplicable license or seek other available remedies. As a result, our development of the respective product candidate or commercialization of the product wouldcease. If we fail to obtain additional financing or acceptable partnership arrangements, we may be unable to complete the development and commercialization ofour product candidates or continue operations. 22 As our programs advance, our costs are likely to increase. Our current and planned discovery activities, pre-clinical and clinical trials, the relateddevelopment, manufacturing, regulatory approval process requirements, and the additional personnel resources and testing required for supporting the developmentof our product candidates will consume significant capital resources. Our expenses, revenues and cash utilization rate could vary significantly depending on manyfactors, including: our ability to raise additional capital; the development progress of our collaborative agreements for our product candidates; the amount offunding we receive from NIAID/HHS and BARDA/HHS for galidesivir or from other new partnerships with third parties for the development of our productcandidates, including BCX7353 and our other rare disease product candidates; the commercial success of peramivir achieved by our partners; the amount orprofitability of any orders for peramivir or galidesivir by any government agency or other party; the progress and results of our current and proposed clinical trialsfor our most advanced product candidates, including BCX7353 and our other rare disease product candidates; the progress made in the manufacture of our leadproducts and the progression of our other programs. We expect that we will be required to raise additional capital to complete the development and commercialization of our current product candidates and wemay seek to raise capital at any time. Additional funding, whether through additional sales of securities, additional borrowings, or collaborative arrangements withpartners, including governmental agencies in general and from any BARDA/HHS or NIAID/HHS contract specifically, may not be available when needed or onterms acceptable to us. The issuance of preferred or common stock or convertible securities, with terms and prices significantly more favorable than those of thecurrently outstanding common stock, could have the effect of diluting or adversely affecting the holdings or rights of our existing stockholders. Additionalborrowings may subject us to more restrictive covenants than are currently applicable to us under our September 23, 2016 Senior Credit Facility with an affiliate ofMidCap Financial Services, LLC (“MidCap”), as administrative agent (the “Senior Credit Facility”). In addition, collaborative arrangements may require us totransfer certain material rights to such corporate partners. Insufficient funds or lack of an acceptable partnership may require us to delay, scale-back or eliminatecertain of our research and development programs. In order to continue future operations and continue our drug development programs, we will be required to raise additional capital. In addition to seekingstrategic partnerships, transactions and government funding, we may decide to access the equity or debt markets, incur additional borrowings, or seek other sourcesto meet liquidity needs. Our ability to raise additional capital may be limited and may greatly depend upon the success of ongoing development related to ourcurrent drug development programs, including post approval studies for RAPIVAB, the progress, timeline and ultimate outcome of our kallikrein inhibitors,including the BCX7353 program (including, but not limited to, formulation progress, phase 3 trials, long-term human safety studies, and the timing ofcarcinogenicity or other required studies), the progress of our other rare disease product candidates, funding for and continued successful development ofgalidesivir, and the progress of our early discovery programs. In addition, constriction and volatility in the equity and debt markets may restrict our futureflexibility to raise capital when such needs arise. Furthermore, we have exposure to many different industries, financing partners and counterparties, includingcommercial banks, investment banks and partners (which include investors, licensing partners, and the U.S. Government) which may be unstable or may becomeunstable in the current economic and political environment. Any such instability may impact these parties’ ability to fulfill contractual obligations to us or theymight limit or place burdensome conditions upon future transactions with us. Also, it is possible that suppliers may be negatively impacted. Any such unfavorableoutcomes in our current programs or unfavorable economic conditions could place severe downward pressure on the price of our common stock and may decreaseopportunities to raise capital in the capital or credit markets, and further could reduce the return available on invested corporate cash, which, if severe andsustained, could have a material and adverse impact on our results of operations and cash flows and limit our ability to continue development of our productcandidates. We may not be able to continue as a going concern if we do not obtain additional capital. We have sustained operating losses for the majority of our corporate history and expect that our 2017 expenses will exceed our 2017 revenues. We expect tocontinue to incur operating losses and negative cash flows until revenues reach a level sufficient to support ongoing operations. Our liquidity needs will be largely determined by the success of operations in regards to the progression of our product candidates in the future. Our plans toalleviate the doubt regarding our ability to continue as a going concern primarily include our ability to control the timing and spending on our research anddevelopment programs and raising additional funds through equity financings. We also may consider other plans to fund operations including: (1) securing orincreasing U.S. Government funding of our programs, including obtaining procurement contracts; (2) out-licensing rights to certain of our products or productcandidates, pursuant to which the we would receive cash milestones; (3) raising additional capital through debt financings or from other sources; (4) obtainingadditional product candidate regulatory approvals, which would generate revenue, milestones and cash flow; (5) reducing spending on one or more research anddevelopment programs by discontinuing development; and/or (6) restructuring operations to change our overhead structure. There can be no assurance that any of our plans will be successful or that additional capital will be available to us on reasonable terms, or at all, whenneeded. If we are unable to obtain sufficient additional capital, we may be forced to curtail operations, delay or stop ongoing clinical trials, cease operationsaltogether or file for bankruptcy. If we fail to successfully commercialize or establish collaborative relationships to commercialize certain of our product candidates, or if any partnerterminates or fails to perform its obligations under agreements with us, potential revenues from commercialization of our product candidates could bereduced, delayed or eliminated. Our business strategy is to increase the asset value of our product candidate portfolio. We believe this is best achieved by retaining full product rights orthrough collaborative arrangements with third parties as appropriate. As needed, potential third-party relationships could include preclinical development, clinicaldevelopment, regulatory approval, marketing, sales and distribution of our product candidates. Currently, we have established collaborative relationships with Mundipharma for the development and commercialization of forodesine and with each ofShionogi and Green Cross for the development and commercialization of peramivir in Japan, Taiwan and South Korea. Most recently we have established acollaborative relationship with Seqirus UK Limited for RAPIVAB on a worldwide basis other than Israel, Japan, Korea and Taiwan. The process of establishingand implementing collaborative relationships is difficult, time-consuming and involves significant uncertainty, including: •our partners may seek to renegotiate or terminate their relationships with us due to unsatisfactory clinical results, including post approval clinicalcommitments, a change in business strategy, a change of control or other reasons; •our contracts for collaborative arrangements may expire; •our partners may choose to pursue alternative technologies, including those of our competitors; •we may have disputes with a partner that could lead to litigation or arbitration; •we do not have day to day control over the activities of our partners and have limited control over their decisions; 23 •our ability to generate future event payments and royalties from our partners depends upon their abilities to establish the safety and efficacy ofour product candidates, obtain regulatory approvals and achieve market acceptance of products developed from our product candidates; •we or our partners may fail to properly initiate, maintain or defend our intellectual property rights, where applicable, or a party may utilize ourproprietary information in such a way as to invite litigation that could jeopardize or potentially invalidate our proprietary information or exposeus to potential liability; •we or our partners may not devote sufficient capital or resources towards our product candidates; and •we or our partners may not comply with applicable government regulatory requirements. If we or our partners fail to fulfill our responsibilities in a timely manner, or at all, our commercialization efforts related to that collaboration could bereduced, delayed or terminated, or it may be necessary for us to assume responsibility for activities that would otherwise have been the responsibility of ourpartner. If we are unable to establish and maintain collaborative relationships on acceptable terms, we may have to delay or discontinue further development of oneor more of our product candidates, undertake commercialization activities at our own expense or find alternative sources of funding. Any delay in the developmentor commercialization of our product candidates would severely affect our business, because if our product candidates do not progress through the developmentprocess or reach the market in a timely manner, or at all, we may not receive additional future event payments and may never receive milestone, product sales orroyalty payments. We do not have a great deal of experience in commercializing our products or technologies, and our future revenue generation is uncertain. We do not have a great deal of experience in commercializing our product candidates or technologies. We currently have limited marketing and commercialcapability, no direct or third-party sales force and limited distribution capabilities. We may be unable to establish or sufficiently increase these capabilities forproducts we currently, or plan to, commercialize. In addition, our revenue from collaborative agreements may be dependent upon the status of our preclinical andclinical programs. Our ability to receive revenue from products we commercialize presents several risks, including: •we or our collaborators may fail to successfully complete clinical trials, or satisfy post-marketing commitments, sufficient to obtain and keep FDAmarketing approval; •many competitors are more experienced and have significantly more resources, and their products could reach the market faster, be more cost effective orhave a better efficacy or tolerability profile than our product candidates; •we may fail to employ a comprehensive and effective intellectual property strategy, which could result in decreased commercial value of our Company andour products; •we may fail to employ a comprehensive and effective regulatory strategy, which could result in a delay or failure in commercialization of our products; •our ability to successfully commercialize our products is affected by the competitive landscape, which cannot be fully known at this time; •reimbursement is constantly changing, which could greatly affect usage of our products; and •future revenue from product sales would depend on our ability to successfully complete clinical studies, obtain regulatory approvals, and manufacture,market and commercialize our approved drugs. Commercialization of peramivir by our partners is subject to the potential commercialization risks described herein and numerous additional risks. Anypotential revenue benefits to us in the form of milestone payments, royalties or other consideration are highly speculative. Commercialization success of peramivir is uncertain and is subject to all the risks and uncertainties disclosed in our other risk factors relating to drugdevelopment and commercialization. In addition, commercialization of peramivir products is subject to further risks and may be negatively impacted by a numberof factors, including, but not limited to, the following: •peramivir may not prove to be adequately safe and effective for market approval in markets other than the United States, Japan, Korea and Taiwan; •necessary funding for post-marketing commitments and further development of peramivir may not be available timely, at all, or in sufficient amounts; 24 •flu prevention or pandemic treatment concerns may not materialize at all, or in the near future; •advances in flu vaccines or other antivirals, including competitive i.v. antivirals, could substantially replace potential demand for peramivir; •a limited number of governmental entities are expected to be the primary potential stockpiling customers for peramivir and if we are not successful atmarketing peramivir to these entities for any reason, we will not receive substantial revenues from stockpiling orders; •government and third party payors may not provide sufficient coverage or reimbursement which would negatively impact the demand forperamivir; •we may not be able to supply commercial material to our partners and our partners may not be able to maintain or establish sufficient and acceptablecommercial manufacturing, either directly or through third-party manufacturers; •the commercial demand and acceptance for peramivir by healthcare providers and by patients may not be sufficient to result in substantial revenues ofperamivir to our partners and may result in little to no milestones or royalties to us; •effectiveness of marketing and commercialization efforts for peramivir by our partners; •market satisfaction with existing alternative therapies; •perceived efficacy relative to other available therapies; •disease prevalence; •cost of treatment; •pricing and availability of alternative products; •marketing and sales activities of competitors; •shifts in the medical community to new treatment paradigms or standards of care; and •relative convenience and ease of administration. We are subject to various federal and state laws related to RAPIVAB and other products under development and, if we or our partners do not comply withthese regulations, we could face substantial penalties. Our or our partners’ activities related to RAPIVAB, or any of our other products under development and following their regulatory approval, are subject toregulatory and law enforcement authorities in addition to the FDA, including the Federal Trade Commission, the Department of Justice, and state and localgovernments. In the case of our collaboration with SUL, although SUL is responsible for RAPIVAB marketing and commercialization efforts, we continue to carrycertain risks associated with RAPIVAB because we hold the RAPIVAB NDA. For example, we are responsible for reporting adverse drug experiences, we haveresponsibility for certain post-approval studies, we may have responsibilities and costs related to a recall or withdrawal of RAPIVAB from sale, we may incurliability associated with RAPIVAB manufacturing contracted by us or in support of any of our partners, we are required to maintain records and provide data andreports to regulatory agencies related to RAPIVAB (e.g. risk evaluation and mitigation strategies, track and trace requirements, adverse events), and we may incurcertain promotional regulatory and government pricing risks, all of which could have a material adverse impact on our operations and financial condition. Inaddition, we are now subject to the federal physician sunshine act and certain similar legislation in various states. We are subject to various federal and state lawspertaining to health care “fraud and abuse,” including both federal and state anti-kickback laws. Although we seek to comply with these statutes, it is possible thatour practices, or those of our distributors, might be challenged under anti-kickback or similar laws. Violations of the physician sunshine act and similar statelegislation or the fraud and abuse laws may be punishable by civil or criminal sanctions, including fines and civil monetary penalties, and future exclusion fromparticipation in government healthcare programs. We have a number of outstanding post-marketing commitments to the FDA that we retain, despite our partnership with SUL, which we may not completesuccessfully or on time for any number of reasons, including but not limited to lack of funds to complete the studies and insufficient interest by appropriate sites,investigators or study subjects. For example, as a condition of the approval of RAPIVAB, we are required to complete a pediatric patient study of RAPIVAB andto submit the final results of this clinical trial to the FDA. Depending on the outcome of this clinical trial, we may be unable to expand the indication forRAPIVAB or we may be required to include specific warnings or limitations on dosing this product, which could negatively impact sales of RAPIVAB andnegatively impact our relationship with our partner. We may be subject to penalties if we fail to comply with post-approval legal and regulatory requirements andour products could be subject to continual recordkeeping and reporting requirements, review and periodic inspections by the FDA and other regulatory bodies.Regulatory approval of a product may be subject to limitations on the indicated uses for which the product may be marketed or to the other restrictive conditions ofapproval that limit our ability to promote, sell or distribute a product. Furthermore, the approval of RAPIVAB and any other future product candidates may besubject to requirements for costly post-marketing testing and surveillance to monitor its safety or efficacy. 25 Advertising and promotion are subject to stringent FDA rules and oversight and as the holder of the NDA we may be held responsible for any advertisingand promotion conducted by our partner that is not in compliance with the rules and regulations. In particular, the claims in all promotional materials and activitiesmust be consistent with the FDA approvals for approved products, and must be appropriately substantiated and fairly balanced with information on the safety risksand limitations of the products. Adverse event information concerning approved products must be reviewed and as the NDA holder of RAPIVAB we are requiredto make expedited and periodic adverse event reports to the FDA and other regulatory authorities. In addition, the research, manufacturing, distribution, sale and promotion of products are potentially subject to regulation by various federal, state and localauthorities in addition to the FDA, including the Centers for Medicare and Medicaid Services, other divisions of the U.S. Department of Health and HumanServices, the U.S. Department of Justice and individual U.S. Attorney offices within the Department of Justice, and state and local governments. Until we cansuccessfully transfer the pricing responsibilities to our partner, we remain responsible for pricing and rebate programs. Pricing and rebate programs must complywith the Medicaid rebate requirements of the Omnibus Budget Reconciliation Act of 1990, as amended, and the Veterans Health Care Act of 1992, as amended. Ifproducts are made available to authorized users of the Federal Supply Schedule of the General Services Administration, additional laws and requirements apply.All of these activities are also potentially subject to federal and state consumer protection and unfair competition laws. If our operations with respect to RAPIVAB or our other products that are subject to healthcare laws and regulations are found to be in violation of any of thehealthcare fraud and abuse laws described above or any other governmental regulations that apply to us, we may be subject to penalties, including civil andcriminal penalties, damages, fines and the curtailment or restructuring of our operations. Any penalties, damages, fines, curtailment or restructuring of ouroperations could adversely affect our ability to operate our business and our financial results. Although compliance programs can mitigate the risk of investigationand prosecution for violations of these laws, the risks cannot be entirely eliminated. Any action against us for violation of these laws, even if we successfullydefend against it, could cause us to incur significant legal expenses and divert our management's attention from the operation of our business. Moreover, achievingand sustaining compliance with all applicable federal and state fraud and abuse laws may be costly. We and our partners may be subject to new legislation, regulatory proposals and healthcare payor initiatives that may increase our costs of complianceand adversely affect our or our partners’ ability to market our products, including RAPIVAB, obtain collaborators and raise capital. The Patient Protection and Affordable Care Act, or PPACA, made extensive changes to the delivery of health care in the U.S. The PPACA includesnumerous provisions that affect pharmaceutical companies, some of which became effective immediately and others of which will be taking effect over the nextseveral years. For example, the PPACA seeks to expand health care coverage to the uninsured through private health insurance reforms and an expansion ofMedicaid. The PPACA will also impose substantial costs on pharmaceutical manufacturers, such as an increase in liability for rebates paid to Medicaid, new drugdiscounts that must be offered to certain enrollees in the Medicare prescription drug benefit, an annual fee imposed on all manufacturers of brand prescriptiondrugs in the U.S., and an expansion of an existing program requiring pharmaceutical discounts to certain types of hospitals and federally subsidized clinics. ThePPACA also contains cost containment measures that could reduce reimbursement levels for health care items and services generally, including pharmaceuticals. Italso will require reporting and public disclosure of payments and other transfers of value provided by pharmaceutical companies to physicians and teachinghospitals. We cannot predict what effect the PPACA or other healthcare reform initiatives that may be adopted in the future will have on our business. Further, itremains unclear whether there will be any changes made to provisions of the PPACA or other health care laws through acts of Congress in the future. Thecontinuing efforts of the government, insurance companies, managed care organizations and other payors of health care services to contain or reduce costs ofhealth care could result in decreased net revenues from our pharmaceutical products and decrease potential returns from our development efforts. In addition,pharmaceutical and device manufacturers will also be required to report and disclose investment interests held by physicians and their immediate family membersduring the preceding calendar year. Failure to submit required information may result in civil monetary penalties for payments, transfers of value or ownership orinvestment interests not reported in an annual submission. Compliance with the PPACA and state laws with similar provisions is difficult and time consuming, andcompanies that do not comply with these state laws face civil penalties. Because of the breadth of these laws and the narrowness of the safe harbors, it is possiblethat some of our business activities could be subject to challenge under one or more of such laws. Such a challenge could have a material adverse effect on ourbusiness, financial condition, results of operations and growth prospects. In addition, there have been a number of other legislative and regulatory proposals aimed at changing the pharmaceutical industry. In particular, legislationhas been enacted in certain states and proposed at a federal level that requires development of an electronic pedigree to track and trace each prescription drug at thesaleable unit level through the distribution system. Compliance with these electronic pedigree requirements may increase our operational expenses and imposesignificant administrative burdens. In addition, our compliance may be deemed insufficient and we could face a material adverse effect on our business, financialcondition, results of operations and growth prospects. As a result of these and other new proposals, we may determine to change our current manner of operation,provide additional benefits or change our contract arrangements, any of which could have a material adverse effect on our business, financial condition and resultsof operations. 26 Managed care organizations are increasingly challenging the prices charged for medical products and services and, in some cases, imposing restrictions onthe coverage of particular drugs. Many managed care organizations negotiate the price of medical services and products and develop formularies which establishpricing and reimbursement levels. Exclusion of a product from a formulary can lead to its sharply reduced usage in the managed care organization’s patientpopulation. The process for obtaining coverage can be lengthy and costly, and we expect that it could take several months before a particular payor initiallyreviews our product and makes a decision with respect to coverage. For example, third-party payors may require cost-benefit analysis data from us in order todemonstrate the cost-effectiveness of RAPIVAB or any other product we might bring to market. For any individual third-party payor, we may not be able toprovide data sufficient to gain reimbursement on a similar or preferred basis to competitive products, or at all which may have a material adverse effect on ourbusiness, financial condition and results of operations. There are risks related to the potential government use or sale of peramivir (RAPIVAB). United States Government use or sale of RAPIVAB in emergency situations, or otherwise, may result in the use of RAPIVAB outside of its approved use.To the extent that RAPIVAB is used as a treatment for influenza by the U.S. Government or peramivir by any other government entity, there can be no assurancethat it will prove to be generally safe, well-tolerated and effective. Such government use of RAPIVAB/peramivir may create certain liabilities for us or our partnersin the case of government use outside of the U.S. There is no assurance that we or our manufacturers will be able to fully meet the demand for peramivir in theevent of additional orders. Further, we may not achieve a favorable price for additional orders of RAPIVAB in the U.S. or peramivir in any other country. Ourcompetitors may develop products that could compete with or replace peramivir. We may face competition in markets where we have no existing intellectualproperty protection or are unable to successfully enforce our intellectual property rights. There is no assurance that the non-U.S. partnerships that we have entered into for peramivir will result in any order for peramivir in those countries. There isno assurance that peramivir will be approved for any use or will achieve market approval in additional countries. In the event that any emergency use or marketapproval is granted, there is no assurance that any government order or commercialization of peramivir in any countries will be substantial or will be profitable tous. In addition, the sale of peramivir, emergency use or other use of peramivir in any country may create certain liabilities for us and our partners. If we or our partners do not obtain and maintain governmental approvals for our product candidates under development, we or our partners will not beable to sell these potential products, which would significantly harm our business because we will receive no revenue. We or our partners must obtain regulatory approval before marketing or selling our future product candidates. If we or our partners are unable to receiveregulatory approval and do not market or sell our future product candidates, we will never receive any revenue from such product sales. In the United States, we orour partners must obtain FDA approval for product candidates that we intend to commercialize. The process of preparing for and obtaining FDA approval may belengthy and expensive, and approval is never certain. Products distributed abroad are also subject to foreign government regulation and export laws of the UnitedStates. Because of the risks and uncertainties in biopharmaceutical development, our product candidates could take a significantly longer time to gain regulatoryapproval than we expect or may never gain approval. If the FDA delays regulatory approval of our product candidates, our management’s credibility, our value andour operating results may suffer. Even if the FDA or foreign regulatory agencies approve a product candidate, the approval may limit the indicated uses for aproduct candidate and/or may require post-approval studies. The FDA regulates, among other things, the record keeping and storage of data pertaining to potential pharmaceutical products. We currently store most ofour preclinical research data, our clinical data and our manufacturing data at our facility. While we do store duplicate copies of most of our clinical data offsite anda significant portion of our data is included in regular backups of our systems, we could lose important data if our facility incurs damage, or if our vendor datasystems fail, suffer damage or are destroyed. If we receive approval to market our potential products, whether in the United States or internationally, we willcontinue to be subject to extensive regulatory requirements. These requirements are wide ranging and govern, among other things: •adverse drug experience reporting regulations; •product promotion; •product manufacturing, including good manufacturing practice requirements; and •product changes or modifications. Our failure to comply with existing or future regulatory requirements, or our loss of, or changes to, previously obtained approvals, could have a materialadverse effect on our business because we will not receive product or royalty revenues if we or our partners do not receive approval of our products for marketing. Royalties and milestone payments from Shionogi under our license agreement with Shionogi (the “Shionogi Agreement”) will be required to be used byRoyalty Sub to service its obligations under its PhaRMA Notes, and generally will not be available to us for other purposes until Royalty Sub has repaid infull its obligations under the PhaRMA Notes. 27 In March 2011, our wholly-owned subsidiary Royalty Sub issued $30.0 million in aggregate principal amount of PhaRMA Notes. The PhaRMA Notes aresecured principally by (i) certain royalty and milestone payments under the Shionogi Agreement, pursuant to which Shionogi licensed from us the rights to marketperamivir in Japan and Taiwan, (ii) rights to certain payments under a Japanese yen/U.S. dollar foreign currency hedge arrangement put into place by us inconnection with the issuance of the PhaRMA Notes and (iii) the pledge by us of our equity interest in Royalty Sub. Payments from Shionogi to us under theShionogi Agreement will generally not be available to us for other purposes until Royalty Sub has repaid in full its obligations under the PhaRMA Notes.Accordingly, these funds will be required to be dedicated to Royalty Sub’s debt service and not available to us for product development or other purposes. As ofSeptember 1, 2014, the payments from Shionogi were insufficient for Royalty Sub to service its obligations under the PhaRMA Notes, resulting in an event ofdefault with respect to the PhaRMA Notes. As a result of this event of default, the holders of the PhaRMA Notes may be able to pursue acceleration of thePhaRMA Notes and foreclose on the collateral securing the PhaRMA Notes and our equity interest in Royalty Sub and may exercise other remedies available tothem under the indenture or other documents related to the PhaRMA Notes. In such event, we may not realize the benefit of future royalty payments that mightotherwise accrue to us following repayment of the PhaRMA Notes, we may incur legal costs and we might otherwise be adversely affected. Because an event of default has occurred under the PhaRMA Notes, the holders of the PhaRMA Notes may be able to pursue acceleration of the PhaRMANotes and foreclose on the collateral securing the PhaRMA Notes and our equity interest in Royalty Sub, in which case we may not realize the benefit offuture royalty payments that might otherwise accrue to us following repayment of the PhaRMA Notes and we could otherwise be adversely affected. Royalty Sub’s ability to service its payment obligations in respect of the PhaRMA Notes, and our ability to benefit from our equity interest in Royalty Sub,is subject to numerous risks. Royalty Sub’s ability to service the PhaRMA Notes may be adversely affected by, among other things, changes in or any terminationof our relationship with Shionogi, reimbursement, regulatory, manufacturing and/or intellectual property issues, product returns, product recalls, product liabilityclaims and allegations of safety issues, as well as other factors. As Royalty Sub has been unable to service its obligations under the PhaRMA Notes and an event ofdefault has occurred under the PhaRMA Notes, the holders of the PhaRMA Notes may be able to pursue acceleration of the PhaRMA Notes and foreclose on thecollateral securing the PhaRMA Notes and our equity interest in Royalty Sub and may exercise other remedies available to them under the indenture or otherdocuments related to the PhaRMA Notes. In such event, we may not realize the benefit of future royalty payments that might otherwise accrue to us followingrepayment of the PhaRMA Notes, we may incur legal costs and we might otherwise be adversely affected. We may be required to pay significant premiums under the foreign currency hedge arrangement entered into by us in connection with the issuance of thePhaRMA Notes. In addition, because our potential obligations under the foreign currency hedge are marked to market, we may experience additionalquarterly volatility in our operating results and cash flows attributable to the foreign currency hedge arrangement. In connection with the issuance by Royalty Sub of the PhaRMA Notes, we entered into a foreign currency hedge arrangement to hedge certain risksassociated with changes in the value of the Japanese yen relative to the U.S. dollar. Under the foreign currency hedge agreement, we may be required to pay anannual premium in the amount of $2.0 million in each May continuing through May 2020. Such payment will be required if, in May of the relevant year, the spotrate of exchange for Japanese yen-U.S. dollars (determined in accordance with the foreign currency hedge arrangement) is such that the U.S. dollar is worth 100yen or less. We will be required to mark-to-market our potential obligations under the currency hedge and post cash collateral, which may cause us to experienceadditional quarterly volatility in our operating results and cash flows as a result. Additionally, we may be required to pay significant premiums or a termination feeunder the foreign currency hedge agreement entered into by us in connection with the issuance of the PhaRMA Notes. We are required to maintain a foreigncurrency hedge at 100 yen per dollar under the agreements governing the PhaRMA Notes. Our Senior Credit Facility contains restrictions that limit our flexibility in operating our business. We may be required to make a prepayment or repay theoutstanding indebtedness earlier than we expect if a prepayment event or an event of default occurs, including a material adverse change with respect tous, which could have a material adverse effect on our business. The Senior Credit Facility contains various covenants that limit our ability to engage in specified types of transactions. These covenants limit our ability to,among other things: •convey, sell, lease, license, transfer or otherwise dispose of certain parts of our business or property; •change the nature of our business; •liquidate or dissolve; •enter into certain change in control or acquisition transactions; •incur or assume certain debt; •grant certain types of liens on our assets; 28 •modify, liquidate or transfer assets in certain collateral accounts; •pay dividends or make certain distributions to our stockholders; •make certain investments; •enter into material transactions with affiliates; and •modify existing debt or collaboration arrangements. The restrictive covenants contained in the Senior Credit Facility could cause us to be unable to pursue business opportunities that we or our stockholdersmay consider beneficial without the lender’s permission or without repaying all Senior Credit Facility obligations. A breach of any of these covenants could result in an event of default under the Senior Credit Facility. An event of default will also occur if, among otherthings, a material adverse change in our business, operations or condition occurs, which could potentially include negative results in clinical trials, or a materialimpairment of the prospect of our repayment of any portion of the amounts we owe under the Senior Credit Facility occurs. In the case of a continuing event ofdefault under the agreement, the lender could elect to declare all amounts outstanding to be immediately due and payable, proceed against the collateral in whichwe granted to the lender a security interest under the Senior Credit Facility, or otherwise exercise the rights of a secured creditor. Amounts outstanding under theSenior Credit Facility are secured by substantially all of our assets and those of our subsidiaries, excluding certain specified assets but including proceeds fromthose assets. If we fail to adequately protect or enforce our intellectual property rights or secure rights to patents of others, the value of those rights would diminish. Our success will depend in part on our ability and the abilities of our partners to obtain, protect and enforce viable intellectual property rights including butnot limited to trade name, trademark and patent protection for our Company and its products, methods, processes and other technologies we may license ordevelop, to preserve our trade secrets, and to operate without infringing the proprietary rights of third parties both domestically and abroad. The patent position ofbiotechnology and pharmaceutical companies is generally highly uncertain, involves complex legal and factual questions and has recently been the subject of muchlitigation. Neither the United States Patent and Trademark Office (“USPTO”), the Patent Cooperation Treaty offices, nor the courts of the United States and otherjurisdictions have consistent policies nor predictable rulings regarding the breadth of claims allowed or the degree of protection afforded under manybiotechnology and pharmaceutical patents. Further, we may not have worldwide patent protection for all of our product candidates and our intellectual propertyrights may not be legally protected or enforceable in all countries throughout the world. In some jurisdictions, some of our product candidates in certain programs,including our HAE program, may have short or no composition of matter patent life and we may therefore rely on orphan drug exclusivity or data exclusivity.There can be no assurance that we will obtain orphan drug exclusivity or data exclusivity in every jurisdiction. Further, in some jurisdictions, we may rely onformulation patents or method of use patents. Both the ability to achieve issuance and the enforcement of formulation and method of use patents can be highlyuncertain and can vary from jurisdiction to jurisdiction, and such patents may therefore not adequately prevent competitors and potential infringers in somejurisdictions. The validity, scope, enforceability and commercial value of the rights protected by such patents, therefore, is highly uncertain. We also rely on trade secrets to protect technology in cases when we believe patent protection is not appropriate or obtainable. However, trade secrets aredifficult to protect. If we cannot maintain the confidentiality of our technology and other confidential information in connection with our collaborators andadvisors, our ability to receive patent protection or protect our proprietary information may be imperiled. We may be involved in lawsuits to protect or enforce our patents, the patents of our partners or our other intellectual property rights, which could beexpensive, time consuming and unsuccessful . Competitors may infringe or otherwise violate our patents, the patents of our licensors or our other intellectual property rights. To counter infringement orunauthorized use, we may be required to file legal claims, which can be expensive and time-consuming and unsuccessful. An adverse result in any litigation ordefense proceeding could put one or more of our patents at risk. Our success depends in part on avoiding the infringement of other parties’ patents and otherintellectual property rights as well as avoiding the breach of any licenses relating to our technologies and products. In the United States, patent applications filed inrecent years are confidential for 18 months, while older applications are not published until the patent issues. As a result, avoiding patent infringement may bedifficult and we may inadvertently infringe third-party patents or proprietary rights. These third parties could bring claims against us, our partners or our licensorsthat even if resolved in our favor, could cause us to incur substantial expenses and, if resolved against us, could additionally cause us to pay substantial damages.Further, if a patent infringement suit were brought against us, our partners or our licensors, we or they could be forced to stop or delay research, development,manufacturing or sales of any infringing product in the country or countries covered by the patent we infringe, unless we can obtain a license from the patentholder. Such a license may not be available on acceptable terms, or at all, particularly if the third party is developing or marketing a product competitive with theinfringing product. Even if we, our partners or our licensors were able to obtain a license, the rights may be nonexclusive, which would give our competitors accessto the same intellectual property. 29 If we or our partners are unable or fail to adequately initiate, protect, defend or enforce our intellectual property rights in any area of commercial interest orin any part of the world where we wish to seek regulatory approval for our products, methods, processes and other technologies, the value of the product candidatesto produce revenue would diminish. Additionally, if our products, methods, processes, and other technologies or our commercial use of such products, processes,and other technologies, including but not limited to any trade name, trademark or commercial strategy infringe the proprietary rights of other parties, we couldincur substantial costs. The USPTO and the patent offices of other jurisdictions have issued to us a number of patents for our various inventions and we have in-licensed several patents from various institutions. We have filed additional patent applications and provisional patent applications with the USPTO. We have fileda number of corresponding foreign patent applications and intend to file additional foreign and U.S. patent applications, as appropriate. We have also filed certaintrademark and trade name applications worldwide. We cannot assure you as to: •the degree and range of protection any patents will afford against competitors with similar products; •if and when patents will issue; •if patents do issue we cannot be sure that we will be able to adequately defend such patents and whether or not we will be able to adequately enforce suchpatents; or •whether or not others will obtain patents claiming aspects similar to those covered by our patent applications. If the USPTO or other foreign patent office upholds patents issued to others or if the USPTO grants patent applications filed by others, we may have to: •obtain licenses or redesign our products or processes to avoid infringement; •stop using the subject matter claimed in those patents; or •pay damages. We may initiate, or others may bring against us, litigation or administrative proceedings related to intellectual property rights, including proceedings beforethe USPTO or other foreign patent office. Any judgment adverse to us in any litigation or other proceeding arising in connection with a patent or patent applicationcould materially and adversely affect our business, financial condition and results of operations. In addition, the costs of any such proceeding may be substantialwhether or not we are successful. Our success is also dependent upon the skills, knowledge and experience, none of which is patentable, of our scientific and technical personnel. To helpprotect our rights, we require all employees, consultants, advisors and partners to enter into confidentiality agreements that prohibit the disclosure of confidentialinformation to anyone outside of our company and require disclosure and assignment to us of their ideas, developments, discoveries and inventions. Theseagreements may not provide adequate protection for our trade secrets, know-how or other proprietary information in the event of any unauthorized use ordisclosure or the lawful development by others of such information, and if any of our proprietary information is disclosed, our business will suffer because ourrevenues depend upon our ability to license or commercialize our product candidates and any such events would significantly impair the value of such productcandidates. Our failure to comply with data protection laws and regulations could lead to government enforcement actions and significant penalties against us andadversely impact our operating results. European Union (“EU”) Member States, Switzerland and other countries have adopted data protection laws and regulation, which impose significantcompliance obligations. For example, the EU Data Protection Directive, as implemented into national laws by the EU Member States, imposes strict obligationsand restrictions on the ability to collect, analyze and transfer personal data, including health data from clinical trials and adverse event reporting. Data protectionauthorities from the different EU Member States may interpret the EU Data Protection Directive and national laws differently, which adds to the complexity ofprocessing personal data in the European Union, and guidance on implementation and compliance practices is often updated or otherwise revised. Our failure tocomply with these laws and regulations could lead to government enforcement actions and significant penalties against us and adversely impact our operatingresults. We are subject to periodic litigation, which could result in losses or unexpected expenditure of time and resources. From time to time, we may be called upon to defend ourselves against lawsuits relating to our business. Due to the inherent uncertainties in litigation, wecannot accurately predict the ultimate outcome of any such proceedings. An unfavorable outcome in any such proceedings could have an adverse impact on ourbusiness, financial condition and results of operations. If our stock price is volatile, we may become involved in securities class action lawsuits in the future. Anylitigation in the future, regardless of its merits, could result in substantial costs and a diversion of management’s attention and resources that are needed tosuccessfully run our business. We face an inherent risk of liability in the event that the use or misuse of our products results in personal injury or death and our product liabilityinsurance coverage may be insufficient. 30 If the use or misuse of peramivir or any other regulatory body-approved products we or a partner may sell in the future harms people, we may be subject tocostly and damaging product liability claims brought against us by consumers, healthcare providers, pharmaceutical companies, third-party payors or others. Theuse of our product candidates in clinical trials, including post marketing clinical studies, could also expose us to product liability claims. We cannot predict all ofthe possible harms or side effects that may result from the use of our products or the testing of product candidates and, therefore, the amount of insurance coveragewe currently may not be adequate to cover all liabilities or defense costs we might incur. A product liability claim or series of claims brought against us could giverise to a substantial liability that could exceed our resources. Even if claims are not successful, the costs of defending such claims and potential adverse publicitycould be harmful to our business. We face an inherent risk of product liability exposure related to the testing of our product candidates in human clinical trials and will face even greater risksupon any commercialization by us of our product candidates. We have product liability insurance covering our commercial sale of peramivir and our clinical trials.Clinical trial and product liability insurance is becoming increasingly expensive. As a result, we may be unable to obtain sufficient insurance or increase ourexisting coverage at a reasonable cost to protect us against losses that could have a material adverse effect on our business. An individual may bring a productliability claim against us if one of our products or product candidates causes, or is claimed to have caused, an injury or is found to be unsuitable for consumer use.Any product liability claim brought against us, with or without merit, could result in: •liabilities that substantially exceed our product liability insurance, which we would then be required to pay from other sources, if available; •an increase of our product liability insurance rates or the inability to maintain insurance coverage in the future on acceptable terms, or at all; •withdrawal of clinical trial volunteers or patients; •damage to our reputation and the reputation of our products, resulting in lower sales; •regulatory investigations that could require costly recalls or product modifications; •litigation costs; and •the diversion of management’s attention from managing our business. Insurance coverage is increasingly more costly and difficult to obtain or maintain. While we currently have insurance for our business, property, directors and officers, and our products insurance is increasingly more costly and narrower inscope, and we may be required to assume more risk in the future. If we are subject to claims or suffer a loss or damage in excess of our insurance coverage, we willbe required to bear any loss in excess of our insurance limits. If we are subject to claims or suffer a loss or damage that is outside of our insurance coverage, wemay incur significant uninsured costs associated with loss or damage that could have an adverse effect on our operations and financial position. Furthermore, anyclaims made on our insurance policies may impact our ability to obtain or maintain insurance coverage at reasonable costs or at all. If our facility incurs damage or power is lost for a significant length of time, our business will suffer. We store clinical and stability samples at our facility that could be damaged if our facility incurs physical damage or in the event of an extended powerfailure. We have backup power systems in addition to backup generators to maintain power to all critical functions, but any loss of these samples could result insignificant delays in our drug development process. In addition, we store most of our preclinical and clinical data at our facilities. Duplicate copies of most critical data are secured off-site. Any significantdegradation or failure of our computer systems could cause us to inaccurately calculate or lose our data. Loss of data could result in significant delays in our drugdevelopment process and any system failure could harm our business and operations. A significant disruption in our information technology systems or a cyber-security breach could adversely affect our business. We are increasingly dependent on information technology systems to operate our business. Like other companies in our industry, our networks andinfrastructure may be vulnerable to cyber-attacks or intrusions, including by computer hackers, foreign governments, foreign companies or competitors, or may bebreached by employee error, malfeasance or other disruption. A breakdown, invasion, corruption, destruction or interruption of critical information technologysystems could negatively impact operations. If our systems are damaged, fail to function properly or otherwise become unavailable, we may incur substantial coststo repair or replace them, and we may experience loss of critical data and interruptions or delays in our ability to perform critical functions, which could adverselyaffect our business, financial condition or results of operations. Any compromise of our data security could also result in a violation of applicable privacy and otherlaws, significant legal and financial exposure, damage to our reputation, loss or misuse of the information and a loss of confidence in our data security measures,which could harm our business. There can be no assurance that our efforts to protect our data and information technology systems will prevent breakdowns orbreaches in our systems, or those of third parties with which we do business, and any such events could adversely affect our business. 31 If we fail to retain our existing key personnel or fail to attract and retain additional key personnel, the development of our product candidates andcommercialization of our products and the related expansion of our business will be delayed or stopped. We are highly dependent upon our senior management and scientific team, the unexpected loss of whose services might impede the achievement of ourdevelopment and commercial objectives. Competition for key personnel with the experience that we require is intense and is expected to continue to increase. Ourinability to attract and retain the required number of skilled and experienced management, commercial, operational and scientific personnel will harm our businessbecause we rely upon these personnel for many critical functions of our business. If because of our use of hazardous materials, we violate any environmental controls or regulations that apply to such materials, we may incur substantialcosts and expenses in our remediation efforts. Our research and development involves the controlled use of hazardous materials, chemicals and various radioactive compounds. We are subject to federal,state and local laws and regulations governing the use, storage, handling and disposal of these materials and some waste products. Accidental contamination orinjury from these materials could occur. In the event of an accident, we could be liable for any damages that result and any liabilities could exceed our resources.Compliance with environmental laws and regulations or a violation of such environmental laws and regulations could require us to incur substantial unexpectedcosts, which would materially and adversely affect our results of operations. Risks relating to investing in our common stock Our existing principal stockholders hold a substantial amount of our common stock and may be able to influence significant corporate decisions, whichmay conflict with the interest of other stockholders. Several of our stockholders own greater than 5% of our outstanding common stock. Our top ten stockholders own more than 50% of BioCryst and canindividually, and as a group, influence our operations based upon their concentrated ownership. These stockholders, if they act together, may be able to influencethe outcome of matters requiring approval of the stockholders, including the election of our directors and other corporate actions. Our stock price has been, and is likely to continue to be, highly volatile, which could result in the value of an investment in our common stock to declinesignificantly. The market prices for securities of biotechnology companies in general have been highly volatile and may continue to be highly volatile in the future.Moreover, our stock price has fluctuated frequently, and these fluctuations are often not related to our financial results. For the twelve months ended December 31,2016, the 52-week range of the market price of our stock was from $1.63 to $10.24 per share. The following factors, in addition to other risk factors described inthis section, may have a significant impact on the market price of our common stock: •announcements of technological innovations or new products by us or our competitors; •developments or disputes concerning patents or proprietary rights; •additional dilution through sales of our common stock or other derivative securities; •status of new or existing licensing or collaborative agreements and government contracts; •announcements relating to the status of our programs; •developments and announcements regarding new and virulent strains of influenza; •we or our partners achieving or failing to achieve development milestones; •publicity regarding actual or potential medical results relating to products under development by us or our competitors; •publicity regarding certain public health concerns for which we are or may be developing treatments; •regulatory developments in both the United States and foreign countries; •public concern as to the safety of pharmaceutical products; •actual or anticipated fluctuations in our operating results; 32 •changes in financial estimates or recommendations by securities analysts; •changes in the structure of healthcare payment systems, including developments in price control legislation; •announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital commitments; •additions or departures of key personnel or members of our board of directors; •purchases or sales of substantial amounts of our stock by existing stockholders, including officers or directors; •economic and other external factors or other disasters or crises; and •period-to-period fluctuations in our financial results. Future sales and issuances of securities may dilute the ownership interests of our current stockholders and cause our stock price to decline. Future sales of our common stock by current stockholders into the public market could cause the market price of our stock to fall. As of January 31, 2017,there were 73,955,169 shares of our common stock outstanding. We may from time to time issue securities in relation to a license arrangement, collaboration,merger or acquisition. We may also sell, for our own account, shares of common stock or other equity securities, from time to time at prices and on terms to bedetermined at the time of sale. As of January 31, 2017, there were 11,835,438 stock options and restricted stock units outstanding, 2,750,318 shares available for issuance under ourAmended and Restated Stock Incentive Plan, and 363,646 shares available for issuance under our Employee Stock Purchase Plan. In addition, we could also makeequity compensation grants outside of our Stock Incentive Plan. The shares underlying existing stock options, restricted stock units and possible future stockoptions, stock appreciation rights and stock awards have been registered pursuant to registration statements on Form S-8. If some or all of such shares are sold or otherwise issued into the public market over a short period of time, our current stockholders’ ownership interestsmay be diluted and the value of all publicly traded shares is likely to decline, as the market may not be able to absorb those shares at then-current market prices.Additionally, such sales and issuances may make it more difficult for us to sell equity securities or equity-related securities in the future at a time and price that ourmanagement deems acceptable, or at all. We have anti-takeover provisions in our corporate charter documents that may result in outcomes with which you do not agree. Our board of directors has the authority to issue up to 4,800,000 shares of undesignated preferred stock and to determine the rights, preferences, privilegesand restrictions of those shares without further vote or action by our stockholders. The rights of the holders of any preferred stock that may be issued in the futuremay adversely affect the rights of the holders of common stock. The issuance of preferred stock could make it more difficult for third parties to acquire a majorityof our outstanding voting stock. In addition, our certificate of incorporation provides for staggered terms for the members of the board of directors and supermajority approval of theremoval of any member of the board of directors and prevents our stockholders from acting by written consent. Our certificate also requires supermajority approvalof any amendment of these provisions. These provisions and other provisions of our by-laws and of Delaware law applicable to us could delay or make moredifficult a merger, tender offer or proxy contest involving us. We have never paid dividends on our common stock and do not anticipate doing so in the foreseeable future. We have never paid cash dividends on our stock. We currently intend to retain all future earnings, if any, for use in the operation of our business.Accordingly, we do not anticipate paying cash dividends on our common stock in the foreseeable future. Information Regarding Forward-Looking Statements This filing contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, which are subjectto the “safe harbor” created in Section 21E. All statements other than statements of historical facts contained in this filing are forward-looking statements. Theseforward-looking statements can generally be identified by the use of words such as “may,” “will,” “intends,” “plans,” “believes,” “anticipates,” “expects,”“estimates,” “predicts,” “potential,” the negative of these words or similar expressions. Statements that describe our future plans, strategies, intentions,expectations, objectives, goals or prospects are also forward-looking statements. Discussions containing these forward-looking statements are principally containedin “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” as well as any amendments wemake to those sections in filings with the SEC. These forward-looking statements include, but are not limited to, statements about: • the preclinical development, clinical development, commercialization, or post-marketing studies of our product candidates and products, including our HAEprogram, peramivir, galidesivir, and early stage discovery programs; 33 • the potential funding from our contracts with NIAID/HHS and BARDA/HHS for the development of galidesivir; • the potential for government stockpiling orders of peramivir, additional regulatory approvals of peramivir or milestones royalties or profit from sales ofperamivir by us or our partners; • the potential use of peramivir as a treatment for H1N1, H5N1, and H7N9 or other strains of influenza; • the implementation of our business model, strategic plans for our business, products, product candidates and technology; • our ability to establish and maintain collaborations or out-license rights to our drug candidates; • plans, programs, progress and potential success of our collaborations, including SUL for peramivir, Mundipharma for forodesine and Shionogi and GreenCross for peramivir in their territories; • Royalty Sub’s ability to service its payment obligations in respect of the PhaRMA Notes, and our ability to benefit from our equity interest in Royalty Sub; • the foreign currency hedge agreement entered into by us in connection with the issuance by Royalty Sub of the PhaRMA Notes; • the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and technology; • our ability to operate our business without infringing the intellectual property rights of others; • estimates of our expenses, revenues, capital requirements, annual cash utilization, and our needs for additional financing; • our ability to continue as a going concern; • the timing or likelihood of regulatory filings or regulatory agreements, deferrals, and approvals; • our ability to raise additional capital to fund our operations or repay our recourse debt obligations; • our ability to comply with the covenants as set forth in the agreements governing our debt obligations; • our financial performance; and • competitive companies, technologies and our industry. These statements relate to future events or to our future financial performance and involve known and unknown risks, uncertainties and other importantfactors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressedor implied by these forward-looking statements. Factors that may cause actual results to differ materially from current expectations include, among other things,those listed under “Risk Factors.” Any forward-looking statement reflects our current views with respect to future events and is subject to these and other risks,uncertainties and assumptions relating to our operations, results of operations, industry and future growth. Except as required by law, we assume no obligation toupdate or revise these forward-looking statements for any reason, even if new information becomes available in the future. ITEM 1B.UNRESOLVED STAFF COMMENTS None. ITEM 2.PROPERTIES We lease property in both Durham, North Carolina and Birmingham, Alabama. Our headquarters, including our clinical and regulatory operations, are basedin Durham, while our principal research facility is located in Birmingham. We currently lease approximately 15,000 square feet in Durham through June 30, 2020and lease approximately 32,000 square feet in Birmingham through October 31, 2026. We believe that our facilities are adequate for our current and planned futureoperations. ITEM 3.LEGAL PROCEEDINGS None. 34 ITEM 4.MINE SAFETY DISCLOSURES Not applicable. PART II ITEM 5.MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITYSECURITIES Market Information Our common stock trades on the NASDAQ Global Select Market under the symbol BCRX. The following table sets forth the low and high sales prices ofour common stock as reported by the NASDAQ Global Select Market for each quarter in 2016 and 2015: 2016 2015 Low High Low HighFirst quarter $1.63 $10.24 $7.85 $12.71 Second quarter $2.49 $4.03 $8.50 $16.43 Third quarter $2.82 $5.80 $10.26 $16.83 Fourth quarter $3.75 $7.56 $8.01 $12.88 The last sale price of the common stock on January 31, 2017 as reported by the NASDAQ Global Select Market was $6.30 per share. Holders As of January 31, 2017, there were approximately 182 holders of record of our common stock. Dividends We have never paid cash dividends and do not anticipate paying cash dividends in the foreseeable future. Stock Performance Graph This performance graph is not “soliciting material,” is not deemed filed with the SEC and is not to be incorporated by reference in any filing by us under theSecurities Act or the Exchange Act, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing. Thestock price performance shown on the graph is not necessarily indicative of future price performance. PERFORMANCE GRAPH FOR BIOCRYSTIndexed Comparison Since 2011 Beginning Investment 12/31/11 Investment at 12/31/12 Investment at 12/31/13 Investment at 12/31/14 Investment at 12/31/15 Investment at 12/31/16BioCryst Pharmaceuticals, Inc. $100.00 $57.49 $307.69 $492.31 $417.81 $256.28 NASDAQ Stock Market (U.S.) 100.00 116.43 155.41 174.78 175.62 198.47 NASDAQ Pharmaceutical Stocks 100.00 114.32 155.11 188.95 199.22 197.05 The above graph measures the change in a $100 investment in our common stock based on its closing price of $2.47 on December 31, 2011 and its year-endclosing price thereafter. Our relative performance is then compared with the CRSP Total Return Indexes for the NASDAQ Stock Market (U.S.) and NASDAQPharmaceutical Stocks. 35 Recent Sales of Unregistered Securities: None. Issuer Purchases of Equity Securities There were no repurchases of our common stock or shares surrendered to satisfy tax obligations during the fourth quarter of 2016. ITEM 6.SELECTED FINANCIAL DATA The selected Statement of Operations Data and Balance Sheet data with respect to the years ended December 31, 2016, 2015, 2014, 2013, and 2012 set forthbelow are derived from our consolidated financial statements. The selected financial data set forth below should be read in conjunction with “Management’sDiscussion and Analysis of Financial Condition and Results of Operations” contained in Item 7 below and our consolidated financial statements and the notesthereto appended to this annual report. Years Ended December 31, 2016 2015 2014 2013 2012 (In thousands, except per share amounts)Statement of Operations Data: Total revenues $26,353 $48,257 $13,608 $17,331 $26,293 Cost of product sold 2,297 1,368 1 — — Research and development expenses 61,008 72,758 51,796 41,943 49,160 General and administrative expenses 11,253 13,047 7,461 6,007 9,130 Royalty expense 402 528 121 98 132 Restructuring costs — — — — 1,759 Loss from operations (48,607) (39,444) (45,771) (30,717) (33,888)Net loss (55,144) (43,019) (45,189) (30,108) (39,081)Basic and diluted net loss per share $(0.75) $(0.59) $(0.68) $(0.55) $(0.79)Weighted average shares outstanding 73,699 72,901 66,773 55,216 49,474 As of December 31, 2016 2015 2014 2013 2012 (In thousands)Balance Sheet Data: Cash, cash equivalents and investments $65,122 $100,858 $114,038 $40,788 $37,058 Receivables 8,768 6,243 9,490 2,115 4,562 Inventory 500 1,612 683 — — Total assets 89,847 122,359 134,238 45,791 53,925 Long-term deferred revenue 8,184 9,674 3,552 4,736 5,920 Non-recourse notes payable 28,243 27,804 27,364 26,925 26,486 Senior credit facility 22,777 — — — — Accumulated deficit (566,061) (510,917) (467,898) (422,709) (392,601)Total stockholders’ equity (deficit) 1,578 47,724 75,635 (1,126) (454) ITEM 7.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS This Annual Report on Form 10-K contains certain statements of a forward-looking nature relating to future events or the future financial performance ofBioCryst. Such statements are only predictions and the actual events or results may differ materially from the results discussed in the forward-looking statements.Factors that could cause or contribute to such differences include those discussed below and elsewhere in this report, as well as those discussed in other filingsmade by BioCryst with the Securities and Exchange Commission. 36 The following Management’s Discussion and Analysis (“MD&A”) is intended to help the reader understand our results of operations and financialcondition. MD&A is provided as a supplement to, and should be read in conjunction with, our audited financial statements and the accompanying notes to thefinancial statements and other disclosures included in this Annual Report on Form 10-K (including the disclosures under “Item 1A. Risk Factors”). Cautionary Statement The discussion herein contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, whichare subject to the “safe harbor” created in Section 21E. Forward looking statements regarding our financial condition and our results of operations that are basedupon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted within the United States (“U.S.GAAP”), as well as projections for the future. The preparation of these financial statements requires our management to make estimates and judgments that affectthe reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on anongoing basis. Our estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Theresults of our estimates form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We operate in a highly competitive environment that involves a number of risks, some of which are beyond our control. We are subject to risks common tobiotechnology and biopharmaceutical companies, including risks inherent in our drug discovery, drug development and commercialization efforts, clinical trials,uncertainty of regulatory actions and marketing approvals, reliance on collaborative partners, enforcement of patent and proprietary rights, the need for futurecapital, competition associated with products, potential competition associated with our product candidates and retention of key employees. In order for any of ourproduct candidates to be commercialized, it will be necessary for us, or our collaborative partners, to conduct clinical trials, demonstrate efficacy and safety of theproduct candidate to the satisfaction of regulatory authorities, obtain marketing approval, enter into manufacturing, distribution and marketing arrangements, andobtain market acceptance and adequate reimbursement from government and private insurers. We cannot provide assurance that we will generate significantrevenues or achieve and sustain profitability in the future. In addition, we can provide no assurance that we will have sufficient funding to meet our future capitalrequirements. Statements contained in Management’s Discussion and Analysis of Financial Condition and Results of Operations and elsewhere in this report whichare not historical facts are, or may constitute, forward-looking statements. Forward-looking statements involve known and unknown risks that could cause ouractual results to differ materially from expected results. The most significant known risks are discussed in the section entitled “Risk Factors.” Although we believethe expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance orachievements. We caution you not to place undue reliance on any forward-looking statements. Our revenues are difficult to predict and depend on numerous factors, including the prevalence and severity of influenza in regions for which peramivir hasreceived regulatory approval, seasonality of influenza, ongoing discussions with government agencies regarding future peramivir and/or galidesivir developmentand stockpiling procurement, as well as entering into, or modifying, licensing agreements for our product candidates. Furthermore, revenues related to ourcollaborative development activities are dependent upon the progress toward and the achievement of developmental milestones by us or our collaborative partners. Our operating expenses are also difficult to predict and depend on several factors, including research and development expenses (and whether theseexpenses are reimbursable under government contracts), drug manufacturing, and clinical research activities, the ongoing requirements of our developmentprograms, and the availability of capital and direction from regulatory agencies, which are difficult to predict. Management may be able to control the timing andlevel of research and development and general and administrative expenses, but many of these expenditures will occur irrespective of our actions due tocontractually committed activities and/or payments. As a result of these factors, we believe that period to period comparisons are not necessarily meaningful and you should not rely on them as an indication offuture performance. Due to all of the foregoing factors, it is possible that our operating results will be below the expectations of market analysts and investors. Insuch event, the prevailing market price of our common stock could be materially adversely affected. Overview We are a biotechnology company that designs, optimizes and develops novel small molecule drugs that block key enzymes involved in the pathogenesis ofdiseases. We focus on the treatment of rare diseases in which significant unmet medical needs exist and align with our capabilities and expertise. We integrate thedisciplines of biology, crystallography, medicinal chemistry and computer modeling to discover and develop small molecule pharmaceuticals through the processknown as structure-guided drug design. Critical Accounting Policies and Estimates The accompanying discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements and therelated disclosures, which have been prepared in accordance with U.S. GAAP. The preparation of these consolidated financial statements requires us to makeestimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosure of contingent assets and liabilities. Weevaluate our estimates, judgments and the policies underlying these estimates on a periodic basis, as situations change, and regularly discuss financial events,policies, and issues with members of our audit committee and our independent registered public accounting firm. We routinely evaluate our estimates and policiesregarding revenue recognition, administration, inventory and manufacturing, taxes, stock-based compensation, research and development, consulting and otherexpenses and any associated liabilities. Recent Corporate Highlights RAPIVAB/RAPIACTA/PERAMIFLU/ALPIVAB (peramivir injection) Peramivir (i.e., product sold or marketed under the RAPIVAB, RAPIACTA, and PERAMIFLU trade names) is approved for commercial sale in the UnitedStates, Canada, Japan, Taiwan and Korea and has a pending approval in the European Union. We receive royalty revenue from commercial and governmentalstockpiling sales of the product from our partners with the exception of U.S. Government stockpiling sales for which we remain directly responsible. In 2016, ourJapanese partner, Shionogi, fulfilled a relatively large stockpiling order to the Japanese government in advance of the 2016/2017 influenza season for which werecorded $5.7 million of net royalties. Although this was not the first Japanese Government order, it represented the largest sales volume in a fiscal year fromRAPIACTA’s history of availability. Proceeds from these stockpiling sales to the Japanese Government are available to us for general corporate use and are notdedicated to satisfying non-recourse obligations under the PhaRMA Notes. 37 On January 8, 2017, we announced that Health Canada approved RAPIVAB ® for treatment of acute, uncomplicated influenza in Canada . On January 30,2017, we announced that the European Medicines Agency (“EMA”) accepted our Marketing Authorization Application (“MAA”) for treatment of symptomstypical of influenza in adults 18 years and older. The acceptance of the MAA begins the review process by the EMA under the centralized licensing procedure forall 28 member states of the European Union, Norway and Iceland. BCX7353 In August 2016, we announced that we had dosed the first subject in the APeX-1 clinical trial of BCX7353 for the oral treatment of HAE. APeX-1 is amulti-part, Phase 2, randomized, double-blind, placebo-controlled, dose ranging trial to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics andefficacy of BCX7353 as a preventative treatment to eliminate or reduce the frequency of angioedema attacks in HAE patients. APEX-1 is being conducted inseveral European countries, Australia and Canada. In part 1 of APeX-1, subjects with HAE were randomized in a 1:1 ratio to receive an oral dose of either 350 mgof BCX7353 once daily (“QD”) or placebo QD for 28 days. The primary efficacy endpoints of APeX-1 are the number of angioedema attacks; attack rate perweek, counts of attacks, proportion of subjects with no attacks, and number of attack-free days. Efficacy analyses will be conducted for HAE attacks reported overthe entire dosing interval (Days 1 through 28) and during the dosing period in which plasma concentrations of BCX7353 should be at steady-state conditions (Days8 through 28). Secondary efficacy endpoints include severity and duration of angioedema attacks and measures of health-related quality of life. Safety will becharacterized through evaluation of adverse events and laboratory testing. Pharmacokinetics and pharmacodynamic effects will be assessed through measurementof plasma drug levels and kallikrein inhibition. A total of approximately 36 subjects have been enrolled in part 1. On February 27, 2017, we reported statistically significant and clinically meaningful reductions in attack frequency from an interim analysis of part 1 of ourongoing multi-part APeX-1 clinical trial in HAE patients. In the interim analysis, twenty-eight subjects, randomized equally to receive BCX7353 350 mg QD orplacebo for 28 days. The baseline attack rate was approximately 1/week and average C1 inhibitor levels were less than 20% of the normal mean, indicating aseverely affected patient population. Baseline characteristics of trial participants were generally well balanced between the two groups with the exception of priorandrogen use, which was more common in the BCX7353 group (11 of 14 compared with 6 of 14 on placebo). Compliance with study drug dosing in the trial wasexcellent and was greater than 98%. The pre-specified per-protocol (“PP”) interim analysis included data on 24 subjects with confirmed Type 1 or Type 2 HAE and completing 28 days oftreatment (11 on BCX7353 and 13 on placebo). The mean rate of independently-adjudicated angioedema attacks for the pre-defined effective dosing period (weeks2 through 4) in BCX7353-treated subjects was 0.34/week compared to 0.92/week for placebo, a reduction of 0.57/week (63%), p = 0.006. In the intent-to-treat(“ITT”) population of 28 subjects, the rate of attack for the effective dosing period for BCX7353 and placebo groups was 0.44/week and 0.91/week, a reduction of0.47/week (52%), p = 0.035. A pre-planned analysis of peripheral and abdominal attacks showed reductions of 88% and 24%, respectively, for BCX7353 compared with placebo (PPanalysis, weeks 2 through 4). To understand this difference, patient diaries were reviewed and abdominal attacks (n = 9, BCX7353 and n = 14, placebo) weresubdivided into two groups: attacks with abdominal symptoms only and attacks with a combination of abdominal and peripheral symptoms (mixed attacks). Thispost-hoc analysis showed that there were 2, 2 and 7 peripheral, mixed and abdominal-only attacks on BCX7353 compared with 22, 12 and 2 attacks, respectively,for placebo. Based on this distribution, it is likely that subjects recorded abdominal adverse events as HAE attack symptoms in their diary. Accordingly, this post-hoc analysis indicated an 88% reduction in the number of attacks for subjects treated with BCX7353, as compared to the placebo arm, characterized by eitherperipheral symptoms-only or a combination of peripheral and abdominal symptoms. Pharmacokinetic and pharmacodynamic analyses indicate steady state BCX7353 plasma levels in HAE subjects were similar to those in healthy subjectsadministered the same dose in a previously completed Phase 1 trial. Steady state trough drug levels (24 hours after dosing) were 11 – 32 times the 50% effectiveconcentration (EC 50 ) for plasma kallikrein inhibition. These observed steady state drug levels greatly exceeded our proposed therapeutic target range of 4 – 8times the EC 50. Daily oral dosing with BCX7353 strongly inhibited plasma kallikrein throughout the 24-hour dosing interval and the degree of inhibition wassimilar to that seen with this dose in the healthy subject Phase 1 trial. Oral BCX7353 350 mg QD for 28 days was generally safe and well tolerated in subjects with HAE. There were no serious adverse events (AEs) and norelated severe AEs. Two subjects in the BCX7353 treatment group discontinued study drug before day 28, one due to an unrelated pre-existing liver disorder, andone due to an adverse event of gastroenteritis associated with elevated liver enzymes. Treatment-emergent adverse events occurring in at least two subjects overall,enumerated by treatment group (BCX7353 [n=14] and placebo [n=14]), respectfully, were: common cold (3, 4); diarrhea (4, 2); flatulence (2, 0); and fatigue (2, 0).No clinically significant changes in hematology parameters, renal function tests, electrolytes, or urinalysis were observed. One subject treated with BCX7353, withpre-existing colitis, hepatic steatosis (i.e., a fatty liver) and more than 20 years of prior androgen use, had an elevation of alanine aminotransferase (ALT) > 3 timesthe upper limit of normal at the end of treatment, which resolved. Based upon this interim analysis, the efficacy, safety and tolerability profile of BCX7353 observed strongly supports its continued development as aprophylactic treatment for HAE. Furthermore, the steady state drug levels observed greatly exceeded our proposed therapeutic target range of 4 – 8 times the EC 50, thereby supporting and prompting us to evaluate doses of BCX7353 lower than the 350 QD tested in part 1 of the trial. Therefore, the APeX-1 trial has beenamended to add a 62.5 mg QD dose level, and to increase the number of subjects at the 125 mg QD and 250 mg QD dose levels, in order to more fully characterizedose response. Specifically, part 2 of APeX-1 will enroll 14 additional subjects with HAE and they will be randomized to 250mg of BCX7353 QD (n=6), 125mgof BCX7353 QD (n=6) or placebo (n=2) and part 3 of APeX-1 will enroll 20 additional subjects with HAE and they will be randomized to 250mg of BCX7353QD(n=6), 125mg of BCX7353 QD (n=6), 62.5mg of BCX7353 QD (n=6) or placebo (n=2). Avoralstat On February 8, 2016, we announced results from OPuS-2. In the OPuS-2 study, HAE patients with a historical attack frequency of greater than 0.45 attacksper week were randomized to treatment with either 500 mg or 300 mg of avoralstat, or placebo, administered three times daily for 12 weeks. Treatment with 500mg and 300 mg of avoralstat three times daily failed to demonstrate a statistically significantly lower mean attack rate versus placebo. The mean (standarddeviation) attack rates per week were 0.63 (0.57) on avoralstat 500mg and 0.71 (0.66) on avoralstat 300mg, compared to 0.61 (0.41) on placebo. Statisticallysignificant improvements in duration of attacks and in the Angioedema Quality of Life total score were observed comparing the 500 mg three times a dayavoralstat arm to placebo. Following the analysis of OPuS-2 results, the decision was made to discontinue further development of the softgel avoralstat formulationin order to focus development efforts on novel dosage forms of avoralstat to achieve meaningfully better drug exposure. 38 In August 2016, we reported a clinical pharmacology study of several avoralstat dosage formulations. Cohorts of healthy volunteers received single doses ofavoralstat ranging from 200 mg to 2000 mg in tablet or suspension formulations, with no clinically significant adverse events reported. While these formulationsimproved total avoralstat exposure (AUC) up to approximately five-fold compared to a 500 mg dose given as soft gel capsules, the plasma concentration-timeprofile has not met our objectives of twice-daily dosing with drug levels at or above the target range. For that reason, we decided to stop further development ofavoralstat. Galidesivir (formerly BCX4430) On March 7, 2016, results from a preclinical study of our antiviral galidesivir in interferon-receptor-deficient mice infected with Zika virus were presentedat a World Health Organization conference in Geneva, Switzerland. The primary goal of the study was to assess the effect of galidesivir treatment on survivalthrough Day 28 in interferon-receptor-deficient mice infected with the Zika virus. Galidesivir was administered by i.m. injection twice a day beginning four hoursprior to virus challenge and continuing for eight days; two dose levels were tested. In the standard dose galidesivir group, 7 of 8 mice survived through Day 28. Inthe low dose galidesivir group (n=8), and in control groups administered vehicle placebo (n=8) or ribavirin at two dose levels (n=16), no animals survived to Day28. Overall survival for the standard dose level of galidesivir was superior to both the placebo and the ribavirin treatment control groups (p < 0.0001). For bothdose levels of galidesivir, median survival was superior to both control groups (>28 days for galidesivir standard dose and 23 days for low dose) compared to 14 to17 days for controls. Additional studies of galidesivir in the same mouse model were conducted at Utah State University. In one study, surviving mice that were previouslytreated with the standard dose of galidesivir after initial Zika virus challenge, were re-challenged with the Zika virus on Day 28, without additional galidesivirtreatment. All the re-challenged mice survived through day 56 with no disease signs observed, indicating the development of effective immune responses. Afurther experiment using the same AG129 mouse model tested the delayed treatment with galidesivir after viral challenge. Groups of mice received galidesivir 150mg/kg twice-daily by i.m. injection starting on days 1, 3, 5, or 7 post infection, or vehicle (control group). All galidesivir treated groups showed a statisticallysignificant survival benefit compared to vehicle controls. On October 29, 2016, galidesivir nonclinical results from a Zika virus infection model were presented in a late-breaker scientific session at IDWeek by Dr.James B. Whitney, PhD, Assistant Professor of Medicine, Harvard Medical School, and Principal Investigator in the Center for Virology and Vaccine Research atBeth Israel Deaconess Medical Center in Boston. Three groups of five healthy rhesus macaques were inoculated with a Puerto Rico strain of Zika virus andadministered either galidesivir by i.m. injection 100 mg/kg BID loading dose followed by 25 mg/kg BID for nine days, galidesivir loading dose of 100 mg/kg BID,or vehicle control. Both galidesivir groups showed reduction in the proportion of animals viremic and in the amount of virus shed of into cerebrospinal fluid, salivaand urine. Galidesivir dosing in rhesus macaques was well-tolerated and offered significant protection against Zika virus infection. In a follow-on experiment, thesame animals were rechallenged with a Thai strain of Zika virus, 72 days after initial inoculation. All animals demonstrated immune responses, and the initialtreatments with galidesivir did not impair the generation of immunity. Results of Operations Year Ended December 31, 2016 Compared to 2015 Total 2016 revenues decreased to $26.4 million as compared to 2015 revenues of $48.3 million. The decrease in 2016 revenues, as compared to 2015, wasprimarily due to the RAPIVAB out-licensing transaction to Seqirus, which resulted in the recognition of $21.8 million of collaborative revenue in 2015 and a $4.0million decrease in 2016 RAPIVAB product sales, as well as a reduction in collaboration revenue associated with lower galidesivir development activity in 2016.All of these decreases were slightly offset by a $7.3 million increase in 2016 peramivir royalty revenue derived from BioCryst’s commercial partners. Acomponent of the peramivir royalty revenue was $5.7 million of Japanese government stockpiling revenue that is available for general corporate use. Althoughthese orders provided a significant cash infusion, stockpiling royalty revenues may not recur on an annual basis as they are subject to the Japanese government’sappropriation and stockpiling process, which is difficult to predict. Revenues in 2016 included $2.3 million of peramivir product revenue from inventory sales toour commercial partners, $9.7 million of royalty revenue from SUL, Shionogi and Green Cross associated with sales of peramivir in the United States, Japan,Korea and Taiwan, $9.5 million of reimbursement of collaborative expenses from NIAID/HHS and BARDA/HHS related to the development of galidesivir, $2.9million of reimbursement of collaborative expenses from BARDA/HHS related to the development of RAPIVAB and $1.8 million associated with collaborativerevenue amortization from other corporate partnerships. The 2015 revenue consisted of $5.7 million of RAPIVAB product revenue and $21.8 million ofcollaborative revenue related to the SUL Agreement, $2.4 million of royalty revenue from SUL, Shionogi and Green Cross associated with sales of peramivir inthe United States, Japan and Korea, $16.3 million of reimbursement of collaborative expenses from BARDA/HHS and NIAID/HHS related to the development ofperamivir and galidesivir, and $1.4 million associated with collaborative revenue amortization from other corporate partnerships. In addition, we recordedapproximately $0.6 million of RAPIVAB revenue under the “Sell-Through” revenue recognition methodology, but going forward we will recognize all futurecommercial RAPIVAB sales as royalty revenue under one of our partnership arrangements. With the expiration of BARDA/HHS peramivir contract, unless weenter into new government contracts, all significant and future reimbursement of collaborative expenses will be under the NIAID/HHS and BARDA/HHSgalidesivir development contracts. Our RAPIVAB revenue will be difficult to predict because of volatility in prevalence, timing and severity of influenza season toseason. Research and Development (“R&D”) expenses decreased to $61.0 million in 2016 from $72.8 million in 2015. The decrease in 2016 R&D expenses, ascompared to 2015, reflects lower spending on our HAE portfolio of compounds associated with the discontinuation of avoralstat development. The following table summarizes our R&D expenses for the periods indicated (amounts are in thousands). 2016 2015 2014R&D expenses by program: Avoralstat $13,433 $27,769 $19,005 BCX7353 21,410 11,819 — Other 2nd generation HAE compounds 1,139 9,320 11,681 Galidesivir 9,458 12,400 13,060 Peramivir 5,552 3,690 2,898 Other research, preclinical and development costs 10,016 7,760 5,152 Total R&D expenses $61,008 $72,758 $51,796 39 R&D expenses include all direct and indirect expenses and are allocated to specific programs at the point of development of a lead product candidate. Directexpenses are charged directly to the program to which they relate and indirect expenses are allocated based upon internal direct labor hours dedicated to eachrespective program. Direct expenses consist of compensation for R&D personnel and costs of outside parties to conduct laboratory studies, develop manufacturingprocesses, manufacture the product candidates, conduct and manage clinical trials, as well as other costs related to our clinical and preclinical studies. IndirectR&D expenses consist of lab supplies and services, facility expenses, depreciation of development equipment and other overhead of our research and developmentefforts. R&D expenses vary according to the number of programs in clinical development and the stage of development of our clinical programs. Later stageclinical programs tend to cost more than earlier stage programs due to the longer length of time of the clinical trials and the higher number of patients enrolled inthese clinical trials. Selling, General and administrative (“SG&A”) expenses decreased to $11.3 million in 2016 compared to $13.0 million in 2015. The decrease of $1.7million was primarily due to lower unrestricted grants awarded to HAE patient advocacy groups, as well as a general reduction of administrative expenses in 2016. Interest expense increased to $6.5 million in 2016 primarily associated with our execution of a $23.0 million Senior Credit Facility with an affiliate ofMidCap Financial Services, LLC (“MidCap”) in September 2016 (the “Senior Credit Facility”), as compared to $5.2 million in 2015. In addition, a mark to marketloss of $1.7 million was recognized in 2016 related to the foreign currency hedge entered into in conjunction with the royalty monetization transaction, comparedto a mark to market loss of $0.6 million in 2015, both resulting from changes in the U.S. dollar/Japanese yen exchange rate during the respective years. In addition,realized currency exchange gains of $0.8 million and $1.7 million were recognized in 2016 and 2015, respectively, related to the exercise of a U.S. dollar/Japaneseyen currency option under our foreign currency hedge. Thus, a resulting net loss of $0.8 million is recognized on our foreign currency derivative for 2016compared to a net gain of $1.1 million for 2015. We entered into a foreign currency hedge agreement to hedge changes in the value of the Japanese yen relative tothe U.S. dollar. The currency hedge does not qualify for hedge accounting treatment and therefore mark to market adjustments are recognized in our ConsolidatedStatements of Comprehensive Loss. Although we cannot predict the future yen/dollar exchange rate, the applicable foreign currency rates moved such that wecurrently have no collateral posted; however, it is possible that collateral will be required to be posted in the future. We are unable to predict future changes in theyen/dollar exchange rate or increases/decreases in our hedge gains/losses associated with the currency hedge agreement. Year Ended December 31, 2015 Compared to 2014 Total 2015 revenues increased to $48.3 million as compared to 2014 revenues of $13.6 million. The increase in 2015 was primarily due to recognizingrevenue associated with the SUL out-licensing transaction, RAPIVAB product revenue and increased collaboration revenue associated with galidesivirdevelopment. The 2015 revenue consisted of $5.7 million of RAPIVAB product revenue and $21.8 million of collaborative revenue related to the SUL Agreement,$2.4 million of royalty revenue from SUL, Shionogi and Green Cross associated with sales of peramivir in the United States, Japan and Korea, $16.3 million ofreimbursement of collaborative expenses from BARDA/HHS and NIAID/HHS related to the development of peramivir and galidesivir, and $1.4 million associatedwith collaborative revenue amortization from other corporate partnerships. In addition, we recorded approximately $0.6 million of RAPIVAB revenue under the“Sell-Through” revenue recognition methodology, but going forward will recognize all future commercial RAPIVAB sales as royalty revenue under one of ourpartnership arrangements. RAPIVAB was available for commercial sale in the U.S. on December 26, 2014. The 2014 revenue consisted of $3.0 million of royaltyrevenue from Shionogi and Green Cross associated with sales of peramivir in Japan and Korea, $9.4 million of reimbursement of collaborative expenses fromBARDA/HHS related to the development of peramivir, $1.2 million associated with collaborative revenue amortization from other corporate partnerships and$33,000 of RAPIVAB revenue. With the expiration of BARDA/HHS peramivir contract, unless we enter into new government contracts, all significant and futurereimbursement of collaborative expenses will be under the NIAID/HHS and BARDA/HHS galidesivir development contracts. Our RAPIVAB revenue will bedifficult to predict because of volatility in prevalence, timing and severity of influenza season to season. R&D expenses increased to $72.8 million in 2015 from $51.8 million in 2014. 2015 R&D expenses, compared with 2014, reflect increased spending on ourHAE programs and slightly higher spending on our RAPIVAB program. In addition, our 2014 equity compensation expense allocated to R&D increased due to thevesting of two underlying milestones under previously issued performance-based stock options for the successful outcome of OPuS-1 and RAPIVAB approval inthe U.S. SG&A expenses increased to $13.0 million in 2015 compared to $7.5 million in 2014. The increase of $5.5 million is primarily associated with increasedmarketing and medical affairs activities associated with our HAE programs, as well as unrestricted grants awarded to the U.S. and international HAE patientadvocacy groups. Interest expense, related to the non-recourse notes issued in conjunction with the peramivir royalty monetization transaction in March 2011, increasedslightly to $5.2 million in 2015 as compared to $5.0 million in 2014. In addition, a mark to market loss of $0.6 million was recognized in 2015 related to theforeign currency hedge entered into in conjunction with the royalty monetization transaction, compared to a mark to market gain of $5.5 million in 2014, bothresulting from changes in the U.S. dollar/Japanese yen exchange rate during the respective years. In addition, a realized currency exchange gain of $1.7 millionwas recognized in 2015 related to the exercise of a U.S. dollar/Japanese yen currency option under our foreign currency hedge. Thus, a resulting $1.1 million netgain is recognized on our foreign currency derivative for 2015. 40 Liquidity and Capital Resources Cash expenditures have exceeded revenues since our inception and we expect our 2017 operating expenses to exceed our 2017 revenues. Our operationshave principally been funded through public offerings and private placements of equity securities; cash from collaborative and other research and developmentagreements, including U.S. Government contracts for RAPIVAB and galidesivir; and to a lesser extent, the PhaRMA Notes financing and the Senior CreditFacility. To date, we have been awarded a BARDA/HHS RAPIVAB development contract totaling $234.8 million, which expired on June 30, 2014, a NIAID/HHSgalidesivir development contract totaling $39.5 million, which is ongoing, and a BARDA/HHS galidesivir development contract totaling $39.1 million, which isalso ongoing. The total amount of NIAID/HHS and BARDA/HHS galidesivir funding obligated under awarded options is $39.5 million and $20.6 million,respectively. We may issue securities through private placement transactions or registered public offerings pursuant to a registration statement filed with the SEC.In addition to the above, we have received funding from other sources, including other collaborative and other research and development agreements; governmentgrants; equipment lease financing; facility leases; research grants; and interest income on our investments. As of December 31, 2016, we had net working capital of $12.6 million, an increase of approximately $11.1 million from $1.5 million at December 31, 2015.The increase in working capital was principally due to proceeds from the Senior Credit Facility partially offset by our normal operating expenses associated withthe development of our product candidates. Our principal sources of liquidity at December 31, 2016 were approximately $22.1 million in cash and cash equivalentsand approximately $41.5 million in investments considered available-for-sale. We anticipate our cash and investments will fund our operations into 2018. We intend to contain costs and cash flow requirements by closely managing our third party costs and headcount, leasing scientific equipment and facilities,contracting with other parties to conduct certain research and development projects and using consultants. We expect to incur additional expenses, potentiallyresulting in significant losses, as we continue to pursue our research and development activities and begin to build a commercial infrastructure. We may incuradditional expenses related to the filing, prosecution, maintenance, defense and enforcement of patent and other intellectual property claims and additionalregulatory costs as our clinical programs advance through later stages of development. The objective of our investment policy is to ensure the safety andpreservation of invested funds, as well as maintaining liquidity sufficient to meet cash flow requirements. We place our excess cash with high credit qualityfinancial institutions, commercial companies, and government agencies in order to limit the amount of our credit exposure. We have not realized any significantlosses on our investments. We plan to finance our needs principally from the following: • lease or loan financing and future public or private equity financing; • our existing capital resources and interest earned on that capital; • payments under existing and executing new contracts with the U.S. Government; and • payments under collaborative and licensing agreements with corporate partners. As our programs continue to advance, our costs will increase. Our current and planned clinical trials, plus the related development, manufacturing,regulatory approval process requirements and additional personnel resources and testing required for the continuing development of our product candidates willconsume significant capital resources and will increase our expenses. Our expenses, revenues and cash utilization rate could vary significantly depending on manyfactors, including our ability to raise additional capital, the development progress of our collaborative agreements for our product candidates, the amount andtiming of funding we receive from existing U.S. Government contracts for galidesivir, the amount of funding or assistance, if any, we receive from new U.S.Government contracts or other new partnerships with third parties for the development and or commercialization of our product candidates, the progress and resultsof our current and proposed clinical trials for our most advanced product candidates, the progress made in the manufacturing of our lead product candidates and theprogression of our other programs. With the funds available at December 31, 2016, we believe these resources will be sufficient to fund our operations into 2018. We have sustained operatinglosses for the majority of our corporate history and expect that our 2017 expenses will exceed our 2017 revenues. We expect to continue to incur operating lossesand negative cash flows until revenues reach a level sufficient to support ongoing operations. Accordingly, our planned operations raise doubt about our ability tocontinue as a going concern. Our liquidity needs will be largely determined by the success of operations in regards to the progression of our product candidates inthe future. Our plans to alleviate the doubt of our going concern, which are probable of effectively being implemented and mitigating these conditions, primarilyinclude our ability to control the timing and spending on our research and development programs and raising additional funds through equity financings. We alsomay consider other plans to fund operations including: (1) securing or increasing U.S. Government funding of our programs, including obtaining procurementcontracts; (2) out-licensing rights to certain of our products or product candidates, pursuant to which the we would receive cash milestones; (3) raising additionalcapital through debt financings or from other sources; (4) obtaining additional product candidate regulatory approvals, which would generate revenue, milestonesand cash flow; (5) reducing spending on one or more research and development programs by discontinuing development; and/or (6) restructuring operations tochange our overhead structure. We may issue securities, including common stock, preferred stock, depositary shares, stock purchase contracts, warrants and units,through private placement transactions or registered public offerings, pursuant to our registration statement on Form S-3 initially filed with the Securities andExchange Commission (“SEC”) on March 3, 2015. Our future liquidity needs, and ability to address those needs, will largely be determined by the success of ourproduct candidates and key development and regulatory events and our decisions in the future. 41 Our long-term capital requirements and the adequacy of our available funds will depend upon many factors, including: • our ability to perform under our government contracts and receive reimbursement, and receive stockpiling procurement contracts; • the magnitude of work under our government contracts; • the progress and magnitude of our research, drug discovery and development programs; • changes in existing collaborative relationships or government contracts; • our ability to establish additional collaborative relationships with academic institutions, biotechnology or pharmaceutical companies andgovernmental agencies or other third parties; • the extent to which our partners, including governmental agencies, will share in the costs associated with the development of our programs or run thedevelopment programs themselves; • our ability to negotiate favorable development and marketing strategic alliances for certain product candidates or a decision to build or expandinternal development and commercial capabilities; • successful commercialization of marketed products by either us or a partner; • the scope and results of preclinical studies and clinical trials to identify and develop product candidates; • our ability to engage sites and enroll subjects in our clinical trials; • the scope of manufacturing of our product candidates to support our preclinical research and clinical trials; • increases in personnel and related costs to support the development and commercialization of our product candidates; • the scope of manufacturing of our drug substance and product candidates required for future NDA filings; • competitive and technological advances; • the time and costs involved in obtaining regulatory approvals; • post-approval commitments for RAPIVAB and other products that receive regulatory approval; and • the costs involved in all aspects of intellectual property strategy and protection including the costs involved in preparing, filing, prosecuting,maintaining, defending and enforcing patent claims. We expect that we will be required to raise additional capital to complete the development and commercialization of our current product candidates and wemay seek to raise capital in the future. Additional funding, whether through additional sales of equity or debt securities, collaborative or other arrangements withcorporate partners or from other sources, including governmental agencies in general and existing government contracts specifically, may not be available whenneeded or on terms acceptable to us. The issuance of preferred or common stock or convertible securities, with terms and prices significantly more favorable thanthose of the currently outstanding common stock, could have the effect of diluting or adversely affecting the holdings or rights of our existing stockholders. Inaddition, collaborative arrangements may require us to transfer certain material rights to such corporate partners. Insufficient funds may require us to delay, scaleback or eliminate certain of our research and development programs. Our future working capital requirements, including the need for additional working capital,will be largely determined by the advancement of our portfolio of product candidates as well as rate of reimbursement by U.S. Government agencies of ourgalidesivir expenses and any future decisions regarding the future of the RAPIVAB and galidesivir programs, including those relating to stockpiling procurement.More specifically, our working capital requirements will be dependent on the number, magnitude, scope and timing of our development programs; regulatoryapproval of our product candidates; obtaining funding from collaborative partners; the cost, timing and outcome of regulatory reviews, regulatory investigations,and changes in regulatory requirements; the costs of obtaining patent protection for our product candidates; the timing and terms of business developmentactivities; the rate of technological advances relevant to our operations; the efficiency of manufacturing processes developed on our behalf by third parties; and thelevel of required administrative support for our daily operations. 42 The restrictive covenants contained in the Senior Credit Facility could cause us to be unable to pursue business opportunities that we or our stockholdersmay consider beneficial without the lender’s permission or without repaying all Senior Credit Facility obligations. These covenants limit our ability to, amongother things, convey, sell, lease, license, transfer or otherwise dispose of certain parts of our business or property; change the nature of our business; liquidate ordissolve; enter into certain change in control or acquisition transactions; incur or assume certain debt; grant certain types of liens on our assets; modify, liquidate ortransfer assets in certain collateral accounts; pay dividends or make certain distributions to our stockholders; make certain investments; enter into materialtransactions with affiliates; and modify existing debt or collaboration arrangements. A breach of any of these covenants could result in an event of default under theSenior Credit Facility. Financial Outlook for 2017 Based upon our development plans, expected operations and our awarded government contracts, we expect 2017 operating cash usage to be in the range of$30 to $50 million, and expect our total 2017 operating expenses to be in the range of $53 to $73 million. Our operating expense range excludes equity-basedcompensation expense due to the difficulty in accurately projecting this expense as it is significantly impacted by the volatility and price of the Company’s stock,as well as vesting of the Company’s outstanding performance-based stock options. Our operating cash forecast excludes any impact of our royalty monetization,hedge collateral posted or returned, and any other non-routine cash outflows or inflows. Our ability to remain within our operating expense and operating cashtarget ranges is subject to multiple factors, including unanticipated or additional general development and administrative costs and other factors described underthe Risk Factors located elsewhere in this report. Off-Balance Sheet Arrangements As of December 31, 2016, we are not involved in any unconsolidated entities or off–balance sheet arrangements. Contractual Obligations In the table below, we set forth our enforceable and legally binding obligations and future commitments and obligations related to all contracts that we arelikely to continue regardless of the fact that they are cancelable as of December 31, 2016. Some of the amounts we include in this table are based on management’sestimates and assumptions about these obligations, including their duration, the possibility of renewal, anticipated actions by third parties, and other factors.Because these estimates and assumptions are necessarily subjective, the obligations we will actually pay in future periods may vary from those reflected in thetable. Payments Due by Period (In thousands)Contractual Obligations Total Less Than 1 Year 1-3 Years 3-5 Years More Than 5 YearsOperating lease obligations $6,151 $871 $1,660 $1,131 $2,489 Purchase obligations(1) 32,964 32,964 — — — Contingent license obligations 1,775 225 450 350 750 Non-recourse notes payable(2) 53,871 11,621 8,400 33,850 — Senior credit facility 29,519 1,982 16,625 10,912 — Total $124,280 $47,663 $27,135 $46,243 $3,239 (1)Purchase obligations include commitments related to clinical development, manufacturing and research operations and other purchase commitments.(2)Assumes the PhaRMA Notes will be repaid at maturity and the related interest costs will accrue and be paid annually through maturity. This assumption isbased on the unpredictable nature of the royalty payments from Shionogi, which are designated for both principal and interest payments on the PhaRMANotes. 43 Under the Currency Hedge Agreement, we have the right to purchase dollars and sell yen at a rate of 100 yen per dollar for which we may be required to paya premium in each year from 2017 through 2020. A payment of $2.0 million will be required if, during the relevant year, the dollar is worth 100 yen or less. As ofDecember 31, 2016, we have no hedge collateral posted against the Currency Hedge Agreement. Because the posting of additional collateral and payment ofannual premiums is contingent on the value of the yen relative to the dollar and other factors, such payments have been excluded from the foregoing table. In addition to the above, we have committed to make potential future “sublicense” payments to third-parties as part of in-licensing and developmentprograms. Payments under these agreements generally become due and payable only upon achievement of certain developmental, regulatory and/or commercialmilestones. Because the achievement of these milestones is neither probable nor reasonably estimable, such contingencies have not been recorded on our balancesheet. Critical Accounting Policies We have established various accounting policies that govern the application of U.S. GAAP, which were utilized in the preparation of our consolidatedfinancial statements. Certain accounting policies involve significant judgments and assumptions by management that have a material impact on the carrying valueof certain assets and liabilities. Management considers such accounting policies to be critical accounting policies. The judgments and assumptions used bymanagement are based on historical experience and other factors, which are believed to be reasonable under the circumstances. Because of the nature of thejudgments and assumptions made by management, actual results could differ from these judgments and estimates, which could have a material impact on thecarrying values of assets and liabilities and the results of operations. While our significant accounting policies are more fully described in Note 1 to our consolidated financial statements included in this Annual Report onForm 10-K for the year ended December 31, 2016, we believe that the following accounting policies are the most critical to aid you in fully understanding andevaluating our reported financial results and affect the more significant judgments and estimates that we use in the preparation of our financial statements. Inventory Our inventories consist of peramivir finished goods and work in process, which are valued at the lower of cost or market using the first-in, first-out (i.e.,FIFO) method. Cost includes materials, labor, overhead, shipping and handling costs. Our inventories are subject to expiration dating. We regularly evaluate thecarrying value of our inventories and provide valuation reserves for any estimated obsolete, short-dated or unmarketable inventories. In addition, we mayexperience spoilage of our raw materials and supplies. Our determination that a valuation reserve might be required, in addition to the quantification of suchreserve, requires us to utilize significant judgment. In connection with the FDA approval of RAPIVAB and other regulatory approvals, we began capitalizing costsassociated with the production of peramivir inventories. Accrued Expenses We enter into contractual agreements with third-party vendors who provide research and development, manufacturing, and other services in the ordinarycourse of business. Some of these contracts are subject to milestone-based invoicing and services are completed over an extended period of time. We recordliabilities under these contractual commitments when an obligation has been incurred. This accrual process involves reviewing open contracts and purchase orders,communicating with our applicable personnel to identify services that have been performed and estimating the level of service performed and the associated costwhen we have not yet been invoiced or otherwise notified of actual cost. The majority of our service providers invoice us monthly in arrears for servicesperformed. We make estimates of our accrued expenses as of each balance sheet date based on the facts and circumstances known to us. We periodically confirmthe accuracy of our estimates with the service providers and make adjustments if necessary. Examples of estimated accrued expenses include: • fees paid to Clinical Research Organizations (“CROs”) in connection with preclinical and toxicology studies and clinical trials; • fees paid to investigative sites in connection with clinical trials; • fees paid to contract manufacturers in connection with the production of our raw materials, drug substance and product candidates; and • professional fees. We base our expenses related to clinical trials on our estimates of the services received and efforts expended pursuant to contracts with multiple researchinstitutions and CROs that conduct and manage clinical trials on our behalf. The financial terms of these agreements are subject to negotiation, vary from contractto contract and may result in uneven payment flows. Payments under some of these contracts depend on factors such as the successful enrollment of patients andthe completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed and the level of effortexpended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we will adjust the accrual accordingly. Ifwe do not identify costs that we have begun to incur or if we underestimate or overestimate the level of these costs, our actual expenses could differ from ourestimates. 44 Revenue Recognition We recognize revenues from collaborative and other research and development arrangements and product sales. Revenue is realized or realizable and earnedwhen all of the following criteria are met: (i) persuasive evidence of an arrangement exists; (ii) delivery has occurred or services have been rendered; (iii) theseller’s price to the buyer is fixed or determinable; and (iv) collectability is reasonably assured. Collaborative and Other Research and Development Arrangements and Royalties Revenue from license fees, royalty payments, event payments, and research and development fees are recognized as revenue when the earnings process iscomplete and we have no further continuing performance obligations or we have completed the performance obligations under the terms of the agreement. Feesreceived under licensing agreements that are related to future performance are deferred and recognized over an estimated period determined by management basedon the terms of the agreement and the products licensed. In the event a license agreement contains multiple deliverables, we evaluate whether the deliverables areseparate or combined units of accounting. Revisions to revenue or profit estimates as a result of changes in the estimated revenue period are recognizedprospectively. Under certain of our license agreements, we receive royalty payments based upon our licensees’ net sales of covered products. We recognize royaltyrevenues when we can reliably estimate such amounts and collectability is reasonably assured. Royalty revenue paid by Shionogi on their product sales is subjectto returns. For arrangements that involve the delivery of more than one element, each product, service and/or right to use assets is evaluated to determine whether itqualifies as a separate unit of accounting. This determination is based on whether the deliverable has “stand-alone value” to the customer. The consideration that isfixed or determinable is then allocated to each separate unit of accounting based on the relative selling price of each deliverable. The estimated selling price of eachdeliverable is determined using the following hierarchy of values: (i) vendor-specific objective evidence of fair value, (ii) third-party evidence of selling price(“TPE”) and (iii) best estimate of selling price (“BESP”). The BESP reflects our best estimate of what the selling price would be if the deliverable was regularlysold by us on a stand-alone basis. In most cases we expect to use TPE or BESP for allocating consideration to each deliverable. The consideration allocated to eachunit of accounting is recognized as the related goods or services are delivered, limited to the consideration that is not contingent upon future deliverables.Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliver services, a right or license touse an asset, or another performance obligation. In June 2015, we entered into a License Agreement (the "SUL Agreement") granting SUL and its affiliates worldwide rights, excluding Israel, Japan, Koreaand Taiwan, to develop, manufacture and commercialize RAPIVAB. The SUL Agreement provides for various types of payments, including a non-refundableupfront fee, milestone payments, and future royalties. Analysis of the SUL Agreement identified three deliverables: (i) license rights, (ii) inventory and (iii)regulatory support to obtain Canadian and EU marketing approvals. We received an upfront payment of $33.7 million from SUL of which $7.0 million wasdetermined to be contingent upon EU marketing approval and will be deferred until that time. Approximately $21.8 million of the upfront payment was allocated tothe license rights and recognized as revenue in the second quarter. Approximately $3.7 million of the upfront payment was allocated to the sale of inventory andwas recognized in the third quarter when the inventory transfer was completed. Approximately $1.2 million of the revenue from the SUL Agreement will berecognized ratably over the expected period of involvement in these regulatory support activities. Milestone payments are recognized as licensing revenue upon the achievement of specified milestones if (i) the milestone is substantive in nature and theachievement of the milestone was not reasonably assured at the inception of the SUL Agreement; and (ii) the fees are non-refundable. Any milestone paymentsreceived prior to satisfying these revenue recognition criteria are recorded as deferred revenue. Under the terms of the SUL Agreement, we may receive up to $12.0 million in additional payments related to the successful achievement of regulatorymilestones, including marketing approval (i) by the FDA for a pediatric indication, (ii) by the EMA for an adult indication in the EU and (iii) by Health Canada foran adult indication in Canada. We evaluated each event based payment under the provisions of ASU 2010-17, Milestone Method of Revenue Recognition , anddetermined that each event based payment met the criteria to be considered substantive and represents a milestone under the milestone method of accounting. Noevent based payments were achieved during the periods presented. Reimbursements received for direct out-of-pocket expenses related to research and development costs are recorded as revenue in the income statementrather than as a reduction in expenses. Under our contracts with BARDA/HHS and NIAID/HHS, revenue is recognized as reimbursable direct and indirect costsare incurred. Product Sales We recognize revenue for sales of RAPIVAB when title and substantially all the risks and rewards of ownership have transferred to the customer, whichgenerally occurs on the date of shipment from our specialty distributors, utilizing the Sell-Through revenue recognition methodology. Product sales are recognizedwhen there is persuasive evidence that an arrangement exists, title has passed, the price was fixed and determinable, and collectability is reasonably assured.Product sales are recognized net of estimated allowances, discounts, sales returns, chargebacks and rebates. In the United States, prior to completion of the SULtransaction, we sold RAPIVAB to specialty distributors, who, in turn, sell to physician offices, hospitals and federal, state and commercial health careorganizations. With the completion of the SUL worldwide license of RAPIVAB, SUL will be responsible for sales of RAPIVAB, other than U.S. Governmentstockpiling sales and the sale of inventory from us to peramivir commercial partners. With the completion of the SUL collaboration, all peramivir third-party sales(i.e., RAPIVAB, RAPIACTA, and PERAMIFLU) will be made by the Company’s partners, except for U.S. Government stockpiling sales, and the Company willbe reliant on these partners to generate sales and provide for sales discounts and rebates. 45 Sales deductions consist of statutory rebates to state Medicaid, Medicare and other government agencies and sales discounts (including trade discounts anddistribution service fees). These deductions are recorded as reductions to revenue from RAPIVAB in the same period as the related sales with estimates of futureutilization derived from historical experience adjusted to reflect known changes in the factors that impact such reserves. We utilize data from external sources to help estimate gross-to-net sales adjustments as they relate to the recognition of revenue for RAPIVAB sold.External sourced data includes, but is not limited to, information obtained from specialty distributors with respect to their inventory levels and sell-through tocustomers, and information from third-party suppliers of market research data to the pharmaceutical industry. We have categorized and described more fully the following significant sales deductions, all of which involve estimates and judgments, which we considerto be critical accounting estimates, and requires us to use information from external sources. Rebates and Chargebacks Statutory rebates to state Medicaid agencies and Medicare are based on statutory discounts to RAPIVAB’s selling price. As it can take up to nine months ormore for information to be received on actual usage of RAPIVAB in Medicaid and other governmental programs, we maintain reserves for amounts payable underthese programs relating to RAPIVAB sales. Chargebacks claimed by specialty distributors are based on the differentials between product acquisition prices paid by the specialty distributors and lowergovernment contract pricing paid by eligible customers covered under federally qualified programs. The amount of the reserve for rebates and chargebacks is based on multiple qualitative and quantitative factors, including the historical and projectedutilization levels, historical payment experience, changes in statutory laws and interpretations as well as contractual terms, product pricing (both normal sellingprices and statutory or negotiated prices), changes in prescription demand patterns and utilization of our product through public benefit plans, and the levels ofRAPIVAB inventory in the distribution channel. We acquire prescription utilization data from third-party suppliers of market research data to the pharmaceuticalindustry. We update our estimates and assumptions each period and record any necessary adjustments to reserves. Settlements of rebates and chargebacks typicallyoccur within nine months from point of sale. To the extent actual rebates and chargebacks differ from our estimates, additional reserves may be required orreserves may need to be reversed, either of which would impact current period product revenue. Discounts and Sales Incentives Discounts and other sales incentives primarily consist of Inventory Management Agreement (“IMA”) fees. Per contractual agreements with our specialtydistributors, we provide an IMA fee based on a percentage of their purchases of RAPIVAB. The IMA fee rates are set forth in our individual contracts. We tracksales to our specialty distributors each period and accrue a liability relating to the unpaid portion of these fees by applying contractual rates to such sales. Product Returns We do not record a product return allowance as we do not offer the ability to return goods once a bona fide shipment has been accepted by a specialtydistributor. Research and Development Expenses Our research and development costs are charged to expense when incurred. Advance payments for goods or services that will be used or rendered for futureresearch and development activities are deferred and capitalized. Such amounts are recognized as expense when the related goods are delivered or the relatedservices are performed. Research and development expenses include, among other items, personnel costs, including salaries and benefits, manufacturing costs,clinical, regulatory, and toxicology services performed by CROs, materials and supplies, and overhead allocations consisting of various administrative andfacilities related costs. Most of our manufacturing and clinical and preclinical studies are performed by third-party CROs. Costs for studies performed by CROs areaccrued by us over the service periods specified in the contracts and estimates are adjusted, if required, based upon our on-going review of the level of servicesactually performed. 46 Additionally, we have license agreements with third parties, such as AECOM, IRL, and UAB, which require fees related to sublicense agreements ormaintenance fees. We expense sublicense payments as incurred unless they are related to revenues that have been deferred, in which case the expenses are deferredand recognized over the related revenue recognition period. We expense maintenance payments as incurred. Deferred collaboration expenses represent sub-license payments paid to our academic partners upon receipt of consideration from various commercialpartners, and other consideration to our academic partners for modification to existing license agreements. These deferred expenses would not have been incurredwithout receipt of such payments or modifications from our commercial partners and are being expensed in proportion to the related revenue being recognized. Webelieve that this accounting treatment appropriately matches expenses with the associated revenue. We group our R&D expenses into two major categories: direct external expenses and indirect expenses. Direct expenses consist of compensation for R&Dpersonnel and costs of outside parties to conduct laboratory studies, develop manufacturing processes and manufacture the product candidate, conduct and manageclinical trials, as well as other costs related to our clinical and preclinical studies. These costs are accumulated and tracked by active program. Indirect expensesconsist of lab supplies and services, facility expenses, depreciation of development equipment and other overhead of our research and development efforts. Thesecosts apply to work on non-active product candidates and our discovery research efforts. Stock-Based Compensation All share-based payments, including grants of stock option awards and restricted stock unit awards, are recognized in our Consolidated Statements ofComprehensive Loss based on their fair values. Stock-based compensation cost is estimated at the grant date based on the fair value of the award and is recognizedas expense on a straight-line basis over the requisite service period of the award. Determining the appropriate fair value model and the related assumptions for themodel requires judgment, including estimating the life of an award, the stock price volatility, and the expected term. We utilize the Black-Scholes option-pricingmodel to value our awards and recognize compensation expense on a straight-line basis over the vesting periods. The estimation of share-based payment awardsthat will ultimately vest requires judgment, and to the extent actual results or updated estimates differ from our current estimates, such amounts will be recorded asa cumulative adjustment in the period estimates are revised. In addition, we have outstanding performance-based stock options for which no compensation expenseis recognized until “performance” has occurred. Significant management judgment is also required in determining estimates of future stock price volatility andforfeitures to be used in the valuation of the options. Actual results, and future changes in estimates, may differ substantially from our current estimates. Foreign Currency Hedge In connection with our issuance of the PhaRMA Notes, we entered into a foreign Currency Hedge Agreement to hedge certain risks associated with changesin the value of the Japanese yen relative to the U.S. dollar. Under the Currency Hedge Agreement, we have the right to purchase dollars and sell yen at a rate of100 yen per dollar for which we may be required to pay a premium in each year from 2017 through 2020, provided the Currency Hedge Agreement remains ineffect. A payment of $2.0 million will be required if, on May 18 of the relevant year, the U.S. dollar is worth 100 yen or less as determined in accordance with theCurrency Hedge Agreement. In conjunction with establishing the Currency Hedge Agreement, we will be required to post collateral to the counterparty, which maycause us to experience additional quarterly volatility in our financial results. We will not be required at any time to post collateral exceeding the maximumpremium payments remaining payable under the Currency Hedge Agreement. As of December 31, 2016, the maximum amount of hedge collateral we may berequired to post is $7.8 million. The Currency Hedge Agreement does not qualify for hedge accounting treatment and therefore mark to market adjustments will be recognized in ourConsolidated Statements of Comprehensive Loss. Mark to market adjustments are determined by quoted prices in markets that are not actively traded and forwhich significant inputs are observable directly or indirectly, representing the Level 2 in the fair value hierarchy as defined by generally accepted accountingprinciples (“U.S. GAAP”). The Company is also required to post collateral in connection with the mark to market adjustments based on defined thresholds. As ofDecember 31, 2016, no collateral was posted under the agreement. Tax We account for uncertain tax positions in accordance with U.S. GAAP. Significant management judgment is required in determining our provision forincome taxes, deferred tax assets and liabilities and any valuation allowance recorded against net deferred tax assets. We have recorded a valuation allowanceagainst all potential tax assets, due to uncertainties in our ability to utilize deferred tax assets, primarily consisting of certain net operating losses carried forward,before they expire. The valuation allowance is based on estimates of taxable income in each of the jurisdictions in which we operate and the period over which ourdeferred tax assets will be recoverable. Impact of Inflation We do not believe that our operating results have been materially impacted by inflation during the past three years. However, we cannot be assured that ouroperating results will not be adversely affected by inflation in the future. We will continually seek to mitigate the adverse effects of inflation on the services thatwe use through improved operating efficiencies and cost containment initiatives. 47 Recent Accounting Pronouncements Note 12 to the Consolidated Financial Statements included in Item 8 of this Annual Report on Form 10-K discusses accounting pronouncements recentlyissued or proposed but not yet required to be adopted. ITEM 7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK. Interest Rate Risk We are subject to interest rate risk on our investment portfolio and borrowings under our fixed-interest rate PhaRMA Notes and our variable-interest rateSenior Credit Facility. The interest rate applicable to our borrowings under PhaRMA Notes is fixed at 14% and the Senior Credit Facility bears a floating interestrate based on LIBOR. Increases in interest rates could therefore increase the associated interest payments that we are required to make on the Senior CreditFacility. As of December 31, 2016, our Senior Credit Facility had an interest rate of 8.6%. We invest in marketable securities in accordance with our investment policy. The primary objectives of our investment policy are to preserve capital,maintain proper liquidity to meet operating needs and maximize yields. Our investment policy specifies credit quality standards for our investments and limits theamount of credit exposure to any single issue, issuer or type of investment. We place our excess cash with high credit quality financial institutions, commercialcompanies, and government agencies in order to limit the amount of credit exposure. Some of the securities we invest in may have market risk. This means that achange in prevailing interest rates may cause the principal amount of the investment to fluctuate. Our investment exposure to market risk for changes in interest rates relates to the increase or decrease in the amount of interest income we can earn on ourportfolio, changes in the market value due to changes in interest rates and other market factors as well as the increase or decrease in any realized gains and losses.Our investment portfolio includes only marketable securities and instruments with active secondary or resale markets to help ensure portfolio liquidity. Ahypothetical 100 basis point increase or decrease in interest rates along the entire interest rate yield curve would not significantly affect the fair value of our interestsensitive financial instruments, including our borrowings, but may affect our future earnings and cash flows. We generally have the ability to hold our fixed-income investments to maturity and therefore do not expect that our operating results, financial position or cash flows will be materially impacted due to a suddenchange in interest rates. However, our future investment income may fall short of expectations due to changes in interest rates, or we may suffer losses in principalif forced to sell securities which have declined in market value due to changes in interest rates or other factors, such as changes in credit risk related to thesecurities’ issuers. To minimize this risk, we schedule our investments to have maturities that coincide with our expected cash flow needs, thus avoiding the needto redeem an investment prior to its maturity date. Accordingly, we do not believe that we have material exposure to interest rate risk arising from our investments.Generally, our investments are not collateralized. We have not realized any significant losses from our investments. We do not use interest rate derivative instruments to manage exposure to interest rate changes. We ensure the safety and preservation of invested principalfunds by limiting default risk, market risk and reinvestment risk. We reduce default risk by investing in investment grade securities. Foreign Currency Risk The majority of our transactions occur in U.S. dollars and we do not have significant operating subsidiaries or significant investments in foreign countries.Therefore, we are not subject to significant foreign currency exchange risk in our normal operations. In connection with the issuance by Royalty Sub of the PhaRMA Notes, we entered into a Currency Hedge Agreement to hedge certain risks associated withchanges in the value of the Japanese yen relative to the U.S. dollar. Under the Currency Hedge Agreement, we are required to post collateral based on our potentialobligations under the Currency Hedge Agreement as determined by periodic mark-to-market adjustments. Provided the Currency Hedge Agreement remains ineffect, we may be required to pay an annual premium in the amount of $2.0 million from May 2017 through May 2020. Such payment will be required if, in Mayof the relevant year, the spot rate of exchange for Japanese yen-U.S. dollars (determined in accordance with the Currency Hedge Agreement) is such that the U.S.dollar is worth 100 yen or less. 48 ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA BIOCRYST PHARMACEUTICALS, INC. CONSOLIDATED BALANCE SHEETS(In thousands, except per share amounts) December 31, 2016 2015ASSETS Cash and cash equivalents $22,104 $28,899 Restricted cash 1,546 1,612 Investments 32,546 22,664 Receivables from collaborations 8,768 6,243 Inventory 500 1,612 Prepaid expenses and other current assets 1,438 2,674 Deferred collaboration expense 85 90 Total current assets 66,987 63,794 Investments 8,926 47,683 Property and equipment, net 9,922 5,149 Deferred collaboration expense 199 265 Other assets 3,813 5,468 Total assets $89,847 $122,359 LIABILITIES AND STOCKHOLDERS’ EQUITY Accounts payable $4,269 $9,307 Accrued expenses 10,836 16,237 Interest payable 8,990 6,746 Deferred collaboration revenue 2,022 2,163 Non-recourse notes payable 28,243 27,804 Total current liabilities 54,360 62,257 Deferred collaboration revenue 8,184 9,674 Deferred rent 244 329 Lease financing obligation 2,704 2,375 Senior credit facility 22,777 — Stockholders’ equity: Preferred stock, $0.001 par value; shares authorized — 5,000; no shares outstanding — — Common stock, $0.01 par value; shares authorized — 200,000; shares issued and outstanding — 73,782 in 2016 and73,355 in 2015 738 734 Additional paid-in capital 566,913 558,113 Accumulated other comprehensive loss (12) (206)Accumulated deficit (566,061) (510,917)Total stockholders’ equity 1,578 47,724 Total liabilities and stockholders’ equity $89,847 $122,359 See accompanying notes to consolidated financial statements. 49 BIOCRYST PHARMACEUTICALS, INC. CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS(In thousands, except per share amounts) Year Ended December 31, 2016 2015 2014Revenues Product sales, net $2,269 $6,291 $33 Royalty revenue 9,682 2,386 3,025 Collaborative and other research and development 14,402 39,580 10,550 Total revenues 26,353 48,257 13,608 Expenses Cost of products sold 2,297 1,368 1 Research and development 61,008 72,758 51,796 Selling, general and administrative 11,253 13,047 7,461 Royalty 402 528 121 Total operating expenses 74,960 87,701 59,379 Loss from operations (48,607) (39,444) (45,771)Interest and other income 793 535 93 Interest expense (6,487) (5,200) (4,998)(Loss) gain on foreign currency derivative (843) 1,090 5,487 Net loss $(55,144) $(43,019) $(45,189)Basic and diluted net loss per common share $(0.75) $(0.59) $(0.68)Weighted average shares outstanding 73,699 72,901 66,773 Unrealized gain (loss) on available for sale investments $194 $(76) $(134)Comprehensive loss $(54,950) $(43,095) $(45,323) See accompanying notes to consolidated financial statements. 50 BIOCRYST PHARMACEUTICALS, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS(In thousands, except per share amounts) Year Ended December 31, 2016 2015 2014Operating activities: Net loss $(55,144) $(43,019) $(45,189)Adjustments to reconcile net loss to net cash used in operating activities: Depreciation, amortization, and impairment 483 180 177 Loss on disposal of property and equipment 17 — 27 Stock-based compensation expense 8,487 9,705 10,177 Amortization of debt issuance costs 558 439 439 Amortization of premium/discount on investments 523 570 150 Change in fair value of foreign currency derivative (811) 564 (5,487)Changes in operating assets and liabilities: Receivables (2,525) 3,247 (7,375)Inventory 1,112 (929) (683)Prepaid expenses and other assets 3,702 637 (2,093)Deferred collaboration expense 71 (102) 59 Accounts payable and accrued expenses (10,524) 13,676 4,656 Interest payable 2,244 717 2,162 Deferred revenue (1,631) 1,199 4,429 Net cash used in operating activities: (53,438) (13,116) (38,551)Investing activities: Acquisition of property and equipment (5,277) (5,122) (106)Proceeds from sale of property and equipment 4 — — Change in restricted cash 66 (1,462) 1 Purchases of investments (14,106) (53,830) (73,875)Sales and maturities of investments 42,652 42,410 34,000 Net cash provided (used) in investing activities: 23,339 (18,004) (39,980)Financing activities: Sale of common stock, net — — 106,600 Net proceeds from common stock issued under stock-based compensation plans 317 5,479 5,307 Proceeds from senior credit facility 22,658 — — Increase in lease financing obligation 329 — — Net cash provided by financing activities: 23,304 5,479 111,907 (Decrease) increase in cash and cash equivalents (6,795) (25,641) 33,376 Cash and cash equivalents at beginning of year 28,899 54,540 21,164 Cash and cash equivalents at end of year $22,104 $28,899 $54,540 See accompanying notes to consolidated financial statements. 51 BIOCRYST PHARMACEUTICALS, INC. CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT)(In thousands, except per share amounts) Common Stock Additional Paid-In Capital Accumulated Other Comprehensive (Loss) Income Accumulated Deficit Total Stockholders’ Equity (Deficit)Balance at December 31, 2013 $591 $420,988 $4 $(422,709) $(1,126)Net loss — — — (45,189) (45,189)Other comprehensive loss — — (134) — (134)Exercise of stock options, 1,314 shares, net 13 4,984 — — 4,997 Employee stock purchase plan sales, 49 shares, net 1 309 — — 310 Issuance of common stock, 11,500 shares, net 115 106,485 — — 106,600 Stock-based compensation expense — 10,177 — — 10,177 Balance at December 31, 2014 720 542,943 (130) (467,898) 75,635 Net loss — — — (43,019) (43,019)Other comprehensive loss — — (76) — (76)Exercise of stock options, 1,359 shares, net 14 5,110 — — 5,124 Employee stock purchase plan sales, 41 shares, net — 355 — — 355 Stock-based compensation expense — 9,705 — — 9,705 Balance at December 31, 2015 734 558,113 (206) (510,917) 47,724 Net loss — — — (55,144) (55,144)Other comprehensive income — — 194 — 194 Exercise of stock options, 351 shares, net 3 (15) — — (12)Employee stock purchase plan sales, 75 shares, net 1 328 — — 329 Stock-based compensation expense — 8,487 — — 8,487 Balance at December 31, 2016 $738 $566,913 $(12) $(566,061) $1,578 See accompanying notes to consolidated financial statements. 52BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Note 1 — Significant Accounting Policies and Concentrations of Risk The Company BioCryst Pharmaceuticals, Inc. (the “Company”) is a biotechnology company that designs, optimizes and develops novel small molecule drugs that blockkey enzymes involved in the pathogenesis of diseases. The Company focuses on the treatment of rare diseases in which significant unmet medical needs exist andalign with its capabilities and expertise. The Company was incorporated in Delaware in 1986 and its headquarters is located in Durham, North Carolina. TheCompany integrates the disciplines of biology, crystallography, medicinal chemistry and computer modeling to discover and develop small moleculepharmaceuticals through the process known as structure-guided drug design. BioCryst has incurred losses and negative cash flows from operations since inception. With the funds available at December 31, 2016, the Company believes these resources will be sufficient to fund its operations into 2018. The Company hassustained operating losses for the majority of its corporate history and expects that its 2017 expenses will exceed its 2017 revenues. The Company expects tocontinue to incur operating losses and negative cash flows until revenues reach a level sufficient to support ongoing operations. Accordingly, its planned operationsraise doubt about its ability to continue as a going concern. The Company’s liquidity needs will be largely determined by the success of operations in regards to theprogression of its product candidates in the future. The Company’s plans to alleviate the doubt of its going concern, which are probable of effectively beingimplemented and mitigating these conditions, primarily include its ability to control the timing and spending on its research and development programs and raisingadditional funds through equity financings. The Company also may consider other plans to fund operations including: (1) securing or increasing U.S. Governmentfunding of its programs, including obtaining procurement contracts; (2) out-licensing rights to certain of its products or product candidates, pursuant to which theCompany would receive cash milestones; (3) raising additional capital through debt financings or from other sources; (4) obtaining additional product candidateregulatory approvals, which would generate revenue, milestones and cash flow; (5) reducing spending on one or more research and development programs bydiscontinuing development; and/or (6) restructuring operations to change its overhead structure. The Company may issue securities, including common stock,preferred stock, depositary shares, stock purchase contracts, warrants and units, through private placement transactions or registered public offerings, pursuant toits registration statement on Form S-3 initially filed with the Securities and Exchange Commission (“SEC”) on March 3, 2015. The Company’s future liquidityneeds, and ability to address those needs, will largely be determined by the success of its product candidates and key development and regulatory events and itsdecisions in the future. Basis of Presentation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, JPR Royalty Sub LLC (“Royalty Sub”) andMDCP, LLC (“MDCP”). Both subsidiaries were formed to facilitate financing transactions for the Company. Royalty Sub was formed in connection with a$30,000 financing transaction the Company completed on March 9, 2011. See Note 3, Royalty Monetization, for a further description of this transaction. MDCPwas formed in connection with a $23,000 Senior Credit Facility that the Company closed on September 23, 2016. See Note 4, Senior Credit Facility, for a furtherdescription of this transaction. All intercompany transactions and balances have been eliminated. The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States(“U.S. GAAP”). Such consolidated financial statements reflect all adjustments that are, in management’s opinion, necessary to present fairly, in all materialrespects, the Company’s consolidated financial position, results of operations, and cash flows. There were no adjustments other than normal recurring adjustments. Reclassifications During the first quarter of 2016, the Company adopted Accounting Standards Update No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30):Simplifying the Presentation of Debt Issuance Costs . Accordingly, debt issuance costs of $2,196 classified as other current assets as of December 31, 2015 havebeen reclassified and netted against non-recourse notes payable to conform to the 2016 presentation. Cash and Cash Equivalents The Company generally considers cash equivalents to be all cash held in commercial checking accounts, certificates of deposit, money market accounts orinvestments in debt instruments with maturities of three months or less at the time of purchase. The carrying value of cash and cash equivalents approximates fairvalue due to the short-term nature of these items. 53BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Restricted Cash Restricted cash as of December 31, 2016 reflects $141 in royalty revenue paid by Shionogi & Co., Ltd. (“Shionogi”) designated for interest on the PhaRMANotes (defined in Note 3) and $1,405 the Company is required to maintain as collateral for a letter of credit associated with the lease execution and build-out of itsnew Birmingham research facilities. Investments The Company invests in high credit quality investments in accordance with its investment policy, which is designed to minimize the possibility of loss. Theobjective of the Company’s investment policy is to ensure the safety and preservation of invested funds, as well as maintaining liquidity sufficient to meet cashflow requirements. The Company places its excess cash with high credit quality financial institutions, commercial companies, and government agencies in order tolimit the amount of its credit exposure. In accordance with its policy, the Company is able to invest in marketable debt securities that may consist of U.S.Government and government agency securities, money market and mutual fund investments, municipal and corporate notes and bonds, commercial paper and assetor mortgage-backed securities, among others. The Company’s investment policy requires it to purchase high-quality marketable securities with a maximumindividual maturity of three years and requires an average portfolio maturity of no more than 18 months. Some of the securities the Company invests in may havemarket risk. This means that a change in prevailing interest rates may cause the principal amount of the investment to fluctuate. To minimize this risk, theCompany schedules its investments with maturities that coincide with expected cash flow needs, thus avoiding the need to redeem an investment prior to itsmaturity date. Accordingly, the Company does not believe it has a material exposure to interest rate risk arising from its investments. Generally, the Company’sinvestments are not collateralized. The Company has not realized any significant losses from its investments. The Company classifies all of its investments as available-for-sale. Unrealized gains and losses on investments are recognized in comprehensive loss, unlessan unrealized loss is considered to be other than temporary, in which case the unrealized loss is charged to operations. The Company periodically reviews itsinvestments for other than temporary declines in fair value below cost basis and whenever events or changes in circumstances indicate that the carrying amount ofan asset may not be recoverable. The Company believes the individual unrealized losses represent temporary declines primarily resulting from interest ratechanges. Realized gains and losses are reflected in interest and other income in the Consolidated Statements of Comprehensive Loss and are determined using thespecific identification method with transactions recorded on a settlement date basis. Investments with original maturities at date of purchase beyond three monthsand which mature at or less than 12 months from the balance sheet date are classified as current. Investments with a maturity beyond 12 months from the balancesheet date are classified as long-term. At December 31, 2016, the Company believes that the cost of its investments is recoverable in all material respects. The following tables summarize the fair value of the Company’s investments by type. The estimated fair values of the Company’s fixed income investmentsare classified as Level 2 in the fair value hierarchy as defined in U.S. GAAP. These valuations are based on observable direct and indirect inputs, primarily quotedprices of similar, but not identical, instruments in active markets or quoted prices for identical or similar instruments in markets that are not active. These fairvalues are obtained from independent pricing services which utilize Level 2 inputs. December 31, 2016 Amortized Cost Accrued Interest Gross Unrealized Gains Gross Unrealized Losses Estimated Fair ValueObligations of U.S. Government and its agencies $20,266 $34 $2 $(4) $20,298 Corporate debt securities 6,179 26 2 (8) 6,199 Certificates of deposit 14,962 17 7 (11) 14,975 Total investments $41,407 $77 $11 $(23) $41,472 December 31, 2015 Amortized Cost Accrued Interest Gross Unrealized Gains Gross Unrealized Losses Estimated Fair ValueObligations of U.S. Government and its agencies $26,557 $88 $— $(99) $26,546 Corporate debt securities 21,820 184 — (41) 21,963 Certificates of deposit 21,884 20 6 (72) 21,838 Total investments $70,261 $292 $6 $(212) $70,347 54BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) The following table summarizes the scheduled maturity for the Company’s investments at December 31, 2016 and 2015. 2016 2015Maturing in one year or less $32,546 $22,664 Maturing after one year through two years 8,926 28,395 Maturing after two years — 19,288 Total investments $41,472 $70,347 Receivable from Collaborations Receivables from collaborations are recorded for amounts due to the Company related to reimbursable research and development costs from the U.S.Department of Health and Human Services, royalty receivables from Shionogi, Green Cross Corporation (“Green Cross”) and Seqirus UK Limited (“SUL”), andproduct sales to SUL. These receivables are evaluated to determine if any reserve or allowance should be established at each reporting date. At December 31, 2016and December 31, 2015, the Company had the following receivables. December 31, 2016 Billed Unbilled TotalU.S. Department of Health and Human Services $— $3,495 $3,495 Shionogi & Co. Ltd. 3,451 — 3,451 Green Cross Corporation 686 — 686 Seqirus UK Limited 957 179 1,136 Total receivables $5,094 $3,674 $8,768 December 31, 2015 Billed Unbilled TotalU.S. Department of Health and Human Services $— $5,536 $5,536 Shionogi & Co. Ltd. 469 — 469 Seqirus UK Limited 210 28 238 Total receivables $679 $5,564 $6,243 Monthly invoices are submitted to the U.S. Department of Health and Human Services related to reimbursable research and development costs. TheCompany is also entitled to monthly reimbursement of indirect costs based on rates stipulated in the underlying contract. The Company’s calculations of itsindirect cost rates are subject to audit by the U.S. Government. Receivables from Product Sales Receivables from product sales are recorded for amounts due to the Company related to sales of RAPIVAB. These receivables are evaluated to determine ifany reserve or allowance should be established at each reporting date. Inventory At December 31, 2016 and December 31, 2015, the Company’s inventory consisted primarily of peramivir work in process and is being manufactured forthe Company’s partners. Inventory is stated at the lower of cost, determined under the first-in, first-out (“FIFO”) method, or market. The Company expenses costsrelated to the production of inventories as research and development expenses in the period incurred until such time it is believed that future economic benefit isexpected to be recognized, which generally is reliant upon receipt of regulatory approval. Upon regulatory approval, the Company will capitalize subsequent costsrelated to the production of inventories. During 2014, in connection with the FDA approval of RAPIVAB, the Company began capitalizing costs associated with the production of RAPIVABinventories. The Company’s inventory consisted of the following: As of December 31, 2016 2015Work in process $500 $1,612 Net inventories $500 $1,612 55BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Property and Equipment Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Computerequipment is depreciated over a life of three years. Laboratory equipment, office equipment, and software are depreciated over a life of five years. Furniture andfixtures are depreciated over a life of seven years. Leasehold improvements are amortized over their estimated useful lives or the expected lease term, whichever isless. Property consists of a leased building which did not meet the sale-leaseback criteria and is recorded at its fair value, less depreciation. The building is beingdepreciated over a period equal to the expected term of the related lease. In accordance with U.S. GAAP, the Company periodically reviews its property and equipment for impairment when events or changes in circumstancesindicate that the carrying amount of such assets may not be recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flowsresulting from the use of the asset and its eventual disposition. In the event that such cash flows are not expected to be sufficient to recover the carrying amount ofthe assets, the assets are written down to their estimated fair values. Property and equipment to be disposed of are reported at the lower of carrying amount or fairvalue less cost to sell. Patents and Licenses The Company seeks patent protection on all internally developed processes and products. All patent related costs are expensed to selling, general andadministrative expenses when incurred as recoverability of such expenditures is uncertain. Accrued Expenses The Company generally enters into contractual agreements with third-party vendors who provide research and development, manufacturing, and otherservices in the ordinary course of business. Some of these contracts are subject to milestone-based invoicing and services are completed over an extended period oftime. The Company records liabilities under these contractual commitments when it determines an obligation has been incurred, regardless of the timing of theinvoice. This process involves reviewing open contracts and purchase orders, communicating with applicable Company personnel to identify services that havebeen performed on its behalf and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet beeninvoiced or otherwise notified of actual cost. The majority of service providers invoice the Company monthly in arrears for services performed. The Companymakes estimates of accrued expenses as of each balance sheet date in its financial statements based on the facts and circumstances. The Company periodicallyconfirms the accuracy of its estimates with the service providers and makes adjustments if necessary. Examples of estimated accrued expenses include: • fees paid to Clinical Research Organizations (“CROs”) in connection with preclinical and toxicology studies and clinical trials; • fees paid to investigative sites in connection with clinical trials; • fees paid to contract manufacturers in connection with the production of the Company’s raw materials, drug substance and drug products; and • professional fees. The Company bases its expenses related to clinical trials on its estimates of the services received and efforts expended pursuant to contracts with multipleresearch institutions and CROs that conduct and manage clinical trials on the Company’s behalf. The financial terms of these agreements are subject to negotiation,vary from contract to contract and may result in uneven payment flows. Payments under some of these contracts depend on factors such as the successfulenrollment of patients and the completion of clinical trial milestones. In accruing service fees, the Company estimates the time period over which services will beperformed and the level of effort expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, theCompany will adjust the accrual accordingly. As of December 31, 2016 and December 31, 2015, the carrying value of accrued expenses approximates their fairvalue due to their short-term settlement. Accrued expenses were comprised of the following: December 31, 2016 2015Compensation and benefits $425 $424 Development costs 7,427 10,398 Inventory 705 549 Professional fees 242 242 Duties and taxes 56 102 Other 1,981 4,522 Total accrued expenses $10,836 $16,237 56BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Income Taxes The liability method is used in the Company’s accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based ondifferences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that are expected to be in effectwhen the differences are expected to reverse. Accumulated Other Comprehensive Loss Accumulated other comprehensive loss is comprised of unrealized gains and losses on available-for-sale investments and is disclosed as a separatecomponent of stockholders’ equity. Amounts reclassified from accumulated other comprehensive loss are recorded as interest and other income on theConsolidated Statements of Comprehensive Loss. During 2016 and 2015, realized gains of $11 and $13, respectively, were reclassified out of accumulated othercomprehensive loss. Revenue Recognition The Company recognizes revenues from collaborative and other research and development arrangements, royalties and product sales when realized orrealizable and earned. Revenue is realized or realizable and earned when all of the following criteria are met: (i) persuasive evidence of an arrangement exists;(ii) delivery has occurred or services have been rendered; (iii) the seller’s price to the buyer is fixed or determinable; and (iv) collectability is reasonably assured. Collaborative and Other Research and Development Arrangements and Royalties Revenue from license fees, royalty payments, event payments, and research and development fees are recognized as revenue when the earnings process iscomplete and the Company has no further continuing performance obligations or the Company has completed the performance obligations under the terms of theagreement. Fees received under licensing agreements that are related to future performance are deferred and recognized over an estimated period determined bymanagement based on the terms of the agreement and the products licensed. Revisions to revenue or profit estimates as a result of changes in the estimated revenueperiod are recognized prospectively. Under certain of the Company’s license agreements, the Company receives royalty payments based upon its licensees’ net sales of covered products. TheCompany recognizes royalty revenues when it can reliably estimate such amounts and collectability is reasonably assured. For arrangements that involve the delivery of more than one element, each product, service and/or right to use assets is evaluated to determine whether itqualifies as a separate unit of accounting. This determination is based on whether the deliverable has “stand-alone value” to the customer. The consideration that isfixed or determinable is then allocated to each separate unit of accounting based on the relative selling price of each deliverable. The estimated selling price of eachdeliverable is determined using the following hierarchy of values: (i) vendor-specific objective evidence of fair value, (ii) third-party evidence of selling price(“TPE”) and (iii) best estimate of selling price (“BESP”). The BESP reflects the Company’s best estimate of what the selling price would be if the deliverable wasregularly sold by the Company on a stand-alone basis. In most cases the Company expects to use TPE or BESP for allocating consideration to each deliverable.The consideration allocated to each unit of accounting is recognized as the related goods or services are delivered, limited to the consideration that is not contingentupon future deliverables. Analyzing the arrangement to identify deliverables requires the use of judgment, and each deliverable may be an obligation to deliverservices, a right or license to use an asset, or another performance obligation. In June 2015, the Company entered into a License Agreement (the “SUL Agreement”) granting SUL and its affiliates worldwide rights, excluding Israel,Japan, Korea and Taiwan, to develop, manufacture and commercialize RAPIVAB. The SUL Agreement provides for various types of payments, including a non-refundable upfront fee, milestone payments, and future royalties. Analysis of the SUL Agreement identified three deliverables: (i) license rights, (ii) inventory and(iii) regulatory support to obtain Canadian and European Union (“EU”) marketing approvals. The Company received an upfront payment of $33,740 from SUL, ofwhich $7,000 was determined to be contingent upon EU marketing approval and will be deferred until that time. Approximately $21,777 of the upfront paymentwas allocated to the license rights and recognized as revenue in 2015. Approximately $3,740 of the upfront payment was allocated to the pending sale of inventoryand was recognized in 2015, when the inventory transfer was completed. Approximately $1,223 of the revenue from the SUL Agreement will be recognized overthe expected period of involvement in these regulatory support activities. Milestone payments are recognized as licensing revenue upon the achievement of specified milestones if (i) the milestone is substantive in nature and theachievement of the milestone was not reasonably assured at the inception of the agreement; and (ii) the fees are non-refundable. Any milestone payments receivedprior to satisfying these revenue recognition criteria are recorded as deferred revenue. 57BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Under the terms of the SUL Agreement, the Company may receive up to $12,000 in additional payments related to the successful achievement of regulatorymilestones, including marketing approval (i) by the FDA for a pediatric indication, (ii) by the EMA for an adult indication in the EU and (iii) by Health Productsand Food Branch of Health Canada (“Health Canada”) for an adult indication in Canada. The Company evaluated each event based payment under the provisionsof ASU 2010-17, Milestone Method of Revenue Recognition , and determined that each event based payment met the criteria to be considered substantive andrepresents a milestone under the milestone method of accounting. No event based payments were achieved during the periods presented. Reimbursements received for direct out-of-pocket expenses related to research and development costs are recorded as revenue in the ConsolidatedStatements of Comprehensive Loss rather than as a reduction in expenses. Under the Company’s contracts with the Biomedical Advanced Research andDevelopment Authority within the United States Department of Health and Human Services (”BARDA/HHS”) and the National Institute of Allergy and InfectiousDiseases (“NIAID/HHS”), revenue is recognized as reimbursable direct and indirect costs are incurred. Product Sales The Company recognizes revenue for sales of RAPIVAB when title and substantially all the risks and rewards of ownership have transferred to thecustomer, which generally occurs on the date of shipment from the Company’s specialty distributors, utilizing the Sell-Through revenue recognition methodology.Product sales are recognized when there is persuasive evidence that an arrangement exists, title has passed, the price is fixed and determinable, and collectability isreasonably assured. Product sales are recognized net of estimated allowances, discounts, sales returns, chargebacks and rebates. In the United States, and prior tothe SUL Agreement, the Company sold RAPIVAB to specialty distributors, who in turn, sell to physician offices, hospitals and federal, state and commercialhealth care organizations. With the completion of the SUL worldwide license of RAPIVAB, SUL will be responsible for sales of RAPIVAB, other than U.S.Government stockpiling sales. With the completion of the SUL collaboration, all peramivir sales (i.e., RAPIVAB, RAPIACTA, and PERAMIFLU) will be madeby the Company’s partners, except for U.S. Government stockpiling sales, and the Company will be reliant on these partners to generate sales. Sales deductions consist of statutory rebates to state Medicaid, Medicare and other government agencies and sales discounts (including trade discounts anddistribution service fees). These deductions are recorded as reductions from revenue from RAPIVAB in the same period as the related sales with estimates offuture utilization derived from historical experience adjusted to reflect known changes in the factors that impact such reserves. The Company utilizes data from external sources to help it estimate gross-to-net sales adjustments as they relate to the recognition of revenue for RAPIVABsold. Externally sourced data includes, but is not limited to, information obtained from specialty distributors with respect to their inventory levels and their sell-through to customers, as well as information from third-party suppliers of market research data to the pharmaceutical industry. The Company accounts for these sales deductions in accordance with authoritative guidance on revenue recognition when consideration is given by a vendorto a customer. The Company has categorized and described more fully the following significant sales deductions, all of which involve estimates and judgments, which theCompany considers to be critical accounting estimates, and require it to use information from external sources. Rebates and Chargebacks Statutory rebates to state Medicaid agencies and Medicare are based on statutory discounts to RAPIVAB’s selling price. As it can take up to nine months ormore for information to be received on actual usage of RAPIVAB in Medicaid and other governmental programs, the Company maintains reserves for amountspayable under these programs relating to RAPIVAB sales. Chargebacks claimed by specialty distributors are based on the differentials between product acquisition prices paid by the specialty distributors and lowergovernment contract pricing paid by eligible customers covered under federally qualified programs. The amount of the reserve for rebates and chargebacks is based on multiple qualitative and quantitative factors, including the historical and projectedutilization levels, historical payment experience, changes in statutory laws and interpretations as well as contractual terms, product pricing (both normal sellingprices and statutory or negotiated prices), changes in prescription demand patterns and utilization of the Company’s product through public benefit plans, and thelevels of RAPIVAB inventory in the distribution channel. The Company acquires prescription utilization data from third-party suppliers of market research data tothe pharmaceutical industry. The Company updates its estimates and assumptions each period and records any necessary adjustments to its reserves. Settlements ofrebates and chargebacks typically occur within nine months from point of sale. To the extent actual rebates and chargebacks differ from the Company’s estimates,additional reserves may be required or reserves may need to be reversed, either of which would impact current period product revenue. 58BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Discounts and Sales Incentives Discounts and other sales incentives primarily consist of Inventory Management Agreement (“IMA”) fees. Per contractual agreements with the Company’sspecialty distributors, the Company provides an IMA fee based on a percentage of their purchases of RAPIVAB. The IMA fee rates are set forth in individualcontracts. The Company tracks sales to these distributors each period and accrues a liability relating to the unpaid portion of these fees by applying the contractualrates to such product sales. With the completion of the SUL collaboration, all peramivir sales (i.e., RAPIVAB, RAPIACTA, and PERAMIFLU) will be made bythe Company’s partners, except for U.S. Government stockpiling sales, and the Company will be reliant on these partners to generate sales and to provide fordiscounts and sales incentives. Product Returns The Company does not record a product return allowance as it does not offer the ability to return goods once a bonafide shipment has been accepted by aspecialty distributor. The Company recorded the following revenues for the years ended December 31: 2016 2015 2014Product sales, net $2,269 $6,291 $33 Royalty revenue 9,682 2,386 3,025 Collaborative and other research and development revenues: U.S. Department of Health and Human Services 12,449 16,337 9,366 Green Cross Corporation — 132 — Shionogi & Co. Ltd. 1,184 1,184 1,184 Seqirus UK Limited 769 21,927 — Total collaborative and other research and development revenues 14,402 39,580 10,550 Total revenues $26,353 $48,257 $13,608 Advertising The Company engages in very limited distribution and direct-response advertising when promoting RAPIVAB. Advertising and promotional costs areexpensed as the costs are incurred. The Company did not incur advertising and product promotion expenses in 2016. Advertising and product promotion expenseswere $103 and $290 for the years ended December 31, 2015 and 2014, respectively. Research and Development Expenses The Company’s research and development costs are charged to expense when incurred. Research and development expenses include all direct and indirectdevelopment costs related to the development of the Company’s portfolio of product candidates. Advance payments for goods or services that will be used orrendered for future research and development activities are deferred and capitalized. Such amounts are recognized as expense when the related goods are deliveredor the related services are performed. Research and development expenses include, among other items, personnel costs, including salaries and benefits,manufacturing costs, clinical, regulatory, and toxicology services performed by CROs, materials and supplies, and overhead allocations consisting of variousadministrative and facilities related costs. Most of the Company’s manufacturing and clinical and preclinical studies are performed by third-party CROs. Costs forstudies performed by CROs are accrued by the Company over the service periods specified in the contracts and estimates are adjusted, if required, based upon theCompany’s on-going review of the level of services actually performed. Additionally, the Company has license agreements with third parties, such as Albert Einstein College of Medicine of Yeshiva University (“AECOM”),Industrial Research, Ltd. (“IRL”), and the University of Alabama at Birmingham (“UAB”), which require fees related to sublicense agreements or maintenancefees. The Company expenses sublicense payments as incurred unless they are related to revenues that have been deferred, in which case the expenses are deferredand recognized over the related revenue recognition period. The Company expenses maintenance payments as incurred. Deferred collaboration expenses represent sub-license payments, paid to the Company’s academic partners upon receipt of consideration from variouscommercial partners, and other consideration paid to the Company’s academic partners for modification to existing license agreements. These deferred expenseswould not have been incurred without receipt of such payments or modifications from the Company’s commercial partners and are being expensed in proportion tothe related revenue being recognized. The Company believes that this accounting treatment appropriately matches expenses with the associated revenue. 59BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Stock-Based Compensation All share-based payments, including grants of stock option awards and restricted stock unit awards, are recognized in the Company’s ConsolidatedStatements of Comprehensive Loss based on their fair values. The fair value of stock option awards is estimated using the Black-Scholes option pricing model. Thefair value of restricted stock unit awards is based on the grant date closing price of the common stock. Stock-based compensation cost is recognized as expense ona straight-line basis over the requisite service period of the award. In addition, we have outstanding performance-based stock options for which no compensationexpense is recognized until “performance” is deemed to have occurred. Interest Expense and Deferred Financing Costs Interest expense for the years ended December 31, 2016, 2015 and 2014 was $6,487, $5,200 and $4,998, respectively, and primarily relates to the issuanceof the PhaRMA Notes (defined in Note 3) and the Senior Credit Facility (defined in Note 4). Costs directly associated with the issuance of the PhaRMA Notes andthe Senior Credit Facility have been capitalized and are netted against the non-recourse notes payable and Senior Credit Facility on the Consolidated BalanceSheets. These costs are being amortized to interest expense over the terms of the PhaRMA Notes and the Senior Credit Facility using the effective interest ratemethod. Amortization of deferred financing costs and original issue discount included in interest expense was $558, $439 and $439 for each of the years endedDecember 31, 2016, 2015 and 2014, respectively. Lease Financing Obligation Based on the terms of the lease agreement for the new research facility in Birmingham, Alabama, the Company had construction period risks during theconstruction period and the Company was deemed the owner of the building (for accounting purposes only) during the construction period, which ended in 2016.Accordingly, the Company recorded an asset of $1,589 at December 31, 2015, representing the Company’s leased portion of the building and recorded acorresponding liability. Upon completion of leasehold improvement construction, the Company did not meet the sale-leaseback criteria for de-recognition of thebuilding asset and liability. Therefore, the lease is accounted for as a financing obligation. The asset will be depreciated over the expected duration of the lease of20.5 years, and rental payments will be treated as principal and interest payments on the lease financing obligation liability. The underlying accounting for thistransaction has no impact on cash flows associated with the underlying lease or construction in process. Interest expense for the year ended December 31, 2016includes $408 related to the lease financing obligation. At December 31, 2016 and 2015, the lease financing obligation balance was $2,704 and $2,375, respectively and was recorded as a long term liability on theconsolidated balance sheets. At December 31, 2016 the remaining future minimum payments under the lease financing obligation are $4,768. Currency Hedge Agreement In connection with the issuance by Royalty Sub of the PhaRMA Notes, the Company entered into a Currency Hedge Agreement to hedge certain risksassociated with changes in the value of the Japanese yen relative to the U.S. dollar. The Currency Hedge Agreement does not qualify for hedge accountingtreatment; therefore mark to market adjustments are recognized in the Company’s Consolidated Statements of Comprehensive Loss. Cumulative mark to marketadjustments for the years ended December 31, 2016, 2015 and 2014 resulted in losses of $1,654 and $564 and a gain of $5,487, respectively. Mark to marketadjustments are determined by a third party pricing model which uses quoted prices in markets that are not actively traded and for which significant inputs areobservable directly or indirectly, representing Level 2 in the fair value hierarchy as defined by U.S. GAAP. In addition, realized currency exchange gains of $811and $1,654 were recognized in 2016 and 2015, respectively, related to the exercise of a U.S. dollar/Japanese yen currency option under the Company’s foreigncurrency hedge. The Company is also required to post collateral in connection with the mark to market adjustments based on defined thresholds. As of December31, 2016 and December 31, 2015, no hedge collateral was posted under the Currency Hedge Agreement. Net Loss Per Share Net loss per share is based upon the weighted average number of common shares outstanding during the period. Diluted loss per share is equivalent to basicnet loss per share for all periods presented herein because common equivalent shares from unexercised stock options, outstanding warrants, and common sharesexpected to be issued under the Company’s employee stock purchase plan were anti-dilutive. The calculation of diluted earnings per share for the years endedDecember 31, 2016, 2015, and 2014 does not include 1,226, 3,524 and 3,991 respectively, of potential common shares as their impact would be anti-dilutive. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions that affect the amountsreported in the financial statements. Actual results could differ from those estimates. 60BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Significant Customers and Other Risks Significant Customers Prior to the SUL Agreement, the Company relied primarily on three specialty distributors to purchase and supply the majority of RAPIVAB. These threepharmaceutical specialty distributors accounted for greater than 90% of all RAPIVAB product sales and accounted for predominantly all of the Company’soutstanding receivables from product sales. The loss of one or more of these specialty distributors as a customer could have negatively impacted thecommercialization of RAPIVAB. However, the Company will utilize these specialty distributors on a limited basis subsequent to the SUL collaboration as SUL,and other peramivir collaboration partners, will be responsible for commercial sales on a worldwide basis. In addition, in connection with the SUL collaboration,all peramivir sales (i.e., RAPIVAB, RAPIACTA, and PERAMIFLU) will be made by the Company’s partners and the Company will be reliant on these partners togenerate sales and remit cash to satisfy receivables. Other than royalty revenues, the Company’s primary source of revenue that has an underlying cash flow stream is the reimbursement of RAPIVAB andgalidesivir (formerly BCX4430) development expenses earned under cost-plus-fixed-fee contracts with BARDA/HHS and NIAID/HHS. The Company relies onBARDA/HHS and NIAID/HHS to reimburse predominantly all of the development costs for its galidesivir program. Accordingly, reimbursement of theseexpenses represents a significant portion of the Company’s collaborative and other research and development revenues. The completion (as with the June 30, 2014BARDA/HHS peramivir development contract) or termination of the NIAID/HHS and BARDA/HHS galidesivir contracts could negatively impact the Company’sfuture Consolidated Statements of Comprehensive Loss and Cash Flows. The Company recognizes royalty revenue from the net sales of RAPIACTA by Shionogi;however, the underlying cash flow from these royalty payments, except for Japanese government stockpiling sales, goes directly to pay the interest, and then theprincipal, on the Company’s non-recourse notes payable. Payment of the interest and the ultimate repayment of principal of these notes will be entirely funded byfuture royalty payments derived from net sales of RAPIACTA. Further, the Company’s drug development activities are performed by a limited group of third partyvendors. If any of these vendors were unable to perform their services, this could significantly impact the Company’s ability to complete its drug developmentactivities. Risks from Third Party Manufacturing and Distribution Concentration The Company relies on single source manufacturers for active pharmaceutical ingredient and finished drug product manufacturing of product candidates indevelopment. Delays in the manufacture or distribution of any product could adversely impact the commercial revenue and future procurement stockpiling of theCompany’s product candidates in development. Credit Risk Cash equivalents and investments are financial instruments which potentially subject the Company to concentration of risk to the extent recorded on theConsolidated Balance Sheets. The Company deposits excess cash with major financial institutions in the United States. Balances may exceed the amount ofinsurance provided on such deposits. The Company believes it has established guidelines for investment of its excess cash relative to diversification and maturitiesthat maintain safety and liquidity. To minimize the exposure due to adverse shifts in interest rates, the Company maintains a portfolio of investments with anaverage maturity of approximately 18 months or less. Other than product sale and collaborative partner receivables discussed above, the majority of the Company’sreceivables from collaborations are due from the U.S. Government, for which there is no assumed credit risk. Going Concern The Company’s liquidity needs will be largely determined by the success of operations in regards to the progression of its product candidates in the future.The Company’s plans to alleviate the doubt of its going concern, which are probable of effectively being implemented and mitigating these conditions, primarilyinclude its ability to control the timing and spending on its research and development programs and raising additional funds through equity financings. TheCompany also may consider other plans to fund operations including: (1) securing or increasing U.S. Government funding of its programs, including obtainingprocurement contracts; (2) out-licensing rights to certain of its products or product candidates, pursuant to which the Company would receive cash milestones;(3) raising additional capital through debt financings or from other sources; (4) obtaining additional product candidate regulatory approvals, which would generaterevenue, milestones and cash flow; (5) reducing spending on one or more research and development programs by discontinuing development; and/or(6) restructuring operations to change its overhead structure. The Company may issue securities, including common stock, preferred stock, depositary shares, stockpurchase contracts, warrants and units, through private placement transactions or registered public offerings, pursuant to its registration statement on Form S-3initially filed with the Securities and Exchange Commission (“SEC”) on March 3, 2015. The Company’s future liquidity needs, and ability to address those needs,will largely be determined by the success of its product candidates and key development and regulatory events and its decisions in the future. 61BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Note 2 — Property and Equipment Property and equipment consisted of the following at December 31: 2016 2015Furniture and fixtures $540 $718 Office equipment 141 1,122 Software 1,117 1,427 Laboratory equipment 3,252 6,004 Leased equipment — 63 Leasehold improvements 8,294 5,610 Construction in progress — 2,821 Building 1,495 1,589 14,839 19,354 Less accumulated depreciation and amortization (4,917) (14,205)Property and equipment, net $9,922 $5,149 Depreciation and amortization expense for the years ended December 31, 2016, 2015 and 2014 was $483, $180 and $177, respectively. Note 3— Royalty Monetization Overview On March 9, 2011, the Company completed a $30,000 financing transaction to monetize certain future royalty and milestone payments under the ShionogiAgreement, pursuant to which Shionogi licensed from the Company the rights to market RAPIACTA in Japan and, if approved for commercial sale, Taiwan. TheCompany received net proceeds of $22,691 from the transaction after transaction costs of $4,309 and the establishment of a $3,000 interest reserve account byRoyalty Sub, available to help cover interest shortfalls in the future. All of the interest reserve account has been fully utilized with the September 2012 interestpayment. As part of the transaction, the Company entered into a purchase and sale agreement dated as of March 9, 2011 with Royalty Sub, whereby the Companytransferred to Royalty Sub, among other things, (i) its rights to receive certain royalty and milestone payments from Shionogi arising under the ShionogiAgreement, and (ii) the right to receive payments under a Japanese yen/US dollar foreign currency hedge arrangement (as further described below, the “CurrencyHedge Agreement”) put into place by the Company in connection with the transaction. Royalty payments will be paid by Shionogi in Japanese yen and milestonepayments will paid in U.S. dollars. The Company’s collaboration with Shionogi was not impacted as a result of this transaction. Non-Recourse Notes Payable On March 9, 2011, Royalty Sub completed a private placement to institutional investors of $30,000 in aggregate principal amount of its PhaRMA SeniorSecured 14.0% Notes due 2020 (the “PhaRMA Notes”). The PhaRMA Notes were issued by Royalty Sub under an Indenture, dated as of March 9, 2011 (the“Indenture”), by and between Royalty Sub and U.S. Bank National Association, as Trustee. Principal and interest on the PhaRMA Notes issued are payable from,and are secured by, the rights to royalty and milestone payments under the Shionogi Agreement transferred by the Company to Royalty Sub and payments, if any,made to Royalty Sub under the Currency Hedge Agreement. The PhaRMA Notes bear interest at 14% per annum, payable annually in arrears on September 1st ofeach year. The Company remains entitled to receive any royalties and milestone payments related to sales of peramivir by Shionogi following repayment of thePhaRMA Notes. Royalty Sub’s obligations to pay principal and interest on the PhaRMA Notes are obligations solely of Royalty Sub and are without recourse to any otherperson, including the Company, except to the extent of the Company’s pledge of its equity interests in Royalty Sub in support of the PhaRMA Notes. TheCompany may, but is not obligated to, make capital contributions to a capital account that may be used to redeem, or on up to one occasion pay any interestshortfall on, the PhaRMA Notes. 62BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) In September 2013, Royalty Sub paid $1,844 of interest on the PhaRMA Notes from royalty payments received from RAPIACTA ® sales from thepreceding four calendar quarters. This payment resulted in an obligation shortfall of approximately $2,356 associated with accrued interest due September 3, 2013.As stipulated under the PhaRMA Notes Indenture, if the amount available for payment on any Payment Date is insufficient to pay all of the interest due on aPayment Date, the shortfall in interest will accrue interest at the interest rate applicable to the PhaRMA Notes compounded annually. Accordingly, commencing inSeptember 2013, the Company began accruing interest at 14% per annum on the interest shortfall of $2,356. In March, June and August of 2014, Royalty Sub paidadditional interest of $446, $1,882 and $70, respectively, bringing the 2013 shortfall down to $222 as of September 30, 2014. Under the terms of the Indenture,Royalty Sub’s inability to pay the full amount of interest payable in September 2013 by the next succeeding Payment Date for the PhaRMA Notes, which wasSeptember 1, 2014, constituted an event of default. Accordingly, the PhaRMA Notes and related accrued interest have been classified as current liabilities on theDecember 31, 2014 balance sheet. As a result of the event of default under the PhaRMA Notes, the holders of the PhaRMA Notes may pursue acceleration of thePhaRMA Notes, may foreclose on the collateral securing the PhaRMA Notes and the equity interest in Royalty Sub and exercise other remedies available to themunder the Indenture in respect of the PhaRMA Notes. In such event, the Company may not realize the benefit of future royalty payments that might otherwiseaccrue to it following repayment of the PhaRMA Notes and it might otherwise be adversely affected. Due to the non-recourse nature of the PhaRMA Notes, in theevent of any potential acceleration or foreclosure, the primary impact to the Company would be the loss of future royalty payments from Shionogi and legal costsassociated with retiring the PhaRMA Notes. In addition, the Company may incur costs associated with liquidating the related Currency Hedge Agreement, whichwould no longer be required in the event of foreclosure, or if the PhaRMA Notes cease to be outstanding. As the PhaRMA Notes are the obligation of Royalty Suband non-recourse to the Company, the event of default of the PhaRMA Notes is not expected to have a significant impact on the Company’s future results ofoperations or cash flows. As of December 31, 2016, the PhaRMA Notes remain in default. The Indenture does not contain any financial covenants. The Indenture includes customary representations and warranties of Royalty Sub, affirmative andnegative covenants of Royalty Sub, Events of Default and related remedies, and provisions regarding the duties of the Trustee, indemnification of the Trustee, andother matters typical for indentures used in structured financings of this type. As of December 31, 2016, the aggregate fair value of the PhaRMA Notes was estimated to be approximately 50% of its carrying value of $30,000. Theestimated fair value of the PhaRMA Notes is classified as Level 2 in the fair value hierarchy as defined in U.S. GAAP. The PhaRMA Notes are redeemable at the option of Royalty Sub at any time at a redemption price equal to the outstanding principal balance of thePhaRMA Notes being redeemed plus accrued and unpaid interest through the redemption date on the PhaRMA Notes being redeemed. Foreign Currency Hedge In connection with the issuance by Royalty Sub of the PhaRMA Notes, the Company entered into a Currency Hedge Agreement to hedge certain risksassociated with changes in the value of the Japanese yen relative to the U.S. dollar. Under the Currency Hedge Agreement, the Company has the right to purchasedollars and sell yen at a rate of 100 yen per dollar for which the Company may be required to pay a premium in each year from 2017 through 2020, provided theCurrency Hedge Agreement remains in effect. A payment of $1,950 will be required if, on May 18 of the relevant year, the U.S. dollar is worth 100 yen or less asdetermined in accordance with the Currency Hedge Agreement. The Currency Hedge Agreement does not qualify for hedge accounting treatment; therefore mark to market adjustments are recognized in the Company’sConsolidated Statement of Comprehensive Loss. Cumulative mark to market adjustments in 2016, 2015 and 2014 resulted in losses of $1,654 and $564 and a gainof $5,487, respectively. In addition, realized currency exchange gains of $811 and $1,654 were recognized in 2016 and 2015, respectively, related to the exerciseof a U.S. dollar/Japanese yen currency option under the Company’s foreign currency hedge. The Company is also required to post collateral in connection with themark to market adjustments based on defined thresholds. As of December 31, 2016 and 2015, no collateral was posted under the Currency Hedge Agreement. TheCompany will not be required at any time to post collateral exceeding the maximum premium payments remaining payable under the Currency Hedge Agreement.As of December 31, 2016, the maximum amount of hedge collateral the Company may be required to post is $7,800. Note 4 — Senior Credit Facility On September 23, 2016, the Company closed a $23,000 Senior Credit Facility with an affiliate of MidCap Financial Services, LLC (“MidCap”), asadministrative agent (the “Senior Credit Facility”). The Senior Credit Facility was fully funded at closing and bears a variable interest rate of LIBOR (which shallnot be less than 0.5%) plus 8%. The Senior Credit Facility includes an interest-only payment period through fiscal 2017 and scheduled monthly principal andinterest payments for the subsequent 40 months. The Company has the option to repay the Senior Credit Facility at any time prior to the scheduled principalrepayment date subject to prepayment fees. Final payment of the Senior Credit Facility is subject to a final payment fee equal to 5% of the principal funded underthe Senior Credit Facility. As of December 31, 2016, the Company had borrowings of $23,000 under the Senior Credit Facility bearing an interest rate of 8.6%. The carrying amountof the debt approximates its fair value based on prevailing interest rates as of the balance sheet date. Scheduled principal repayments of the Senior Credit Facilityare as follows: Principal Payments2017 $— 2018 6,900 2019 6,900 2020 6,900 2021 2,300 Total $23,000 63BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) The debt agreement contains two provisions that if deemed probable would create the recognition of an embedded feature; however, at this time we do notbelieve either provision is probable. Note 5 — Lease Obligations and Other Contingencies The Company has the following minimum payments under operating lease obligations that existed at December 31, 2016: 2017 $871 2018 838 2019 822 2020 653 2021 478 Thereafter 2,489 Total minimum payments $6,151 The obligations in the preceding table are primarily related to the Company’s leases for buildings in Birmingham, Alabama and Durham, North Carolina.The lease for the Company’s headquarters in Durham, North Carolina expires June 30, 2020. The lease for the Company’s research facility in Birmingham,Alabama expires October 31, 2026. Rent expense for operating leases was $721, $664 and $633 in 2016, 2015, and 2014, respectively. Lease Financing Obligation Based on the terms of the lease agreement for the new research facility in Birmingham, Alabama, the Company had construction period risks during theconstruction period and the Company was deemed the owner of the building (for accounting purposes only) during the construction period, which ended in 2016.Accordingly, the Company recorded an asset of $1,589 at December 31, 2015, representing the Company’s leased portion of the building and recorded acorresponding liability. Upon completion of leasehold improvement construction, the Company did not meet the sale-leaseback criteria for de-recognition of thebuilding asset and liability. Therefore, the lease is accounted for as a financing obligation. The asset will be depreciated over the expected duration of the lease, andrental payments will be treated as principal and interest payments on the lease financing obligation liability. The underlying accounting for this transaction has noimpact on cash flows associated with the underlying lease and or construction in process. At December 31, 2016 and 2015, the lease financing obligation balance was $2,704 and $2,375, respectively and was recorded as a long term liability on theconsolidated balance sheets. The remaining future minimum payments under the lease financing obligation are $4,768. Note 6 — Stockholders’ Equity Sales of Common Stock On March 3, 2015, the Company filed a $150,000 shelf registration statement on Form S-3 with the SEC. This shelf registration statement became effectiveupon filing and allows the Company to sell securities, including common stock, preferred stock, depository shares, stock purchase contracts, warrants and units,from time to time at prices and on terms to be determined at the time of sale. On February 26, 2016, the Company filed a post-effective amendment to thisregistration statement, which allowed for its use by the Company when declared effective by the SEC’s staff on April 18, 2016. Note 7 — Stock-Based Compensation Stock Incentive Plan As of December 31, 2016, the Company had two stock-based employee compensation plans, the Stock Incentive Plan (“Incentive Plan”) and the EmployeeStock Purchase Plan (“ESPP”). The Incentive Plan was amended and restated in April 2016 and approved by the Company’s stockholders in May 2016. The ESPPwas amended and restated in March 2014 and approved by the Company’s stockholders in May 2014. Stock-based compensation expense of $8,487 ($8,340 ofexpense related to the Incentive Plan, $147 of expense related to the ESPP) was recognized during 2016, while $9,705 ($9,485 of expense related to the IncentivePlan, $220 of expense related to the ESPP) was recognized during 2015, and $10,177 ($9,963 of expense related to the Incentive Plan, $214 of expense related tothe ESPP) was recognized during 2014. 64BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) The Company accounts for stock-based compensation in accordance with FASB authoritative guidance regarding share-based payments. Total stock-basedcompensation was allocated as follows: Year Ended December 31, 2016 2015 2014Research and development $6,088 $7,580 $8,906 General and administrative 2,399 2,125 1,271 Total stock-based compensation expense $8,487 $9,705 $10,177 The Company grants stock option awards and restricted stock unit awards to its employees, directors, and consultants under the Incentive Plan. Under theIncentive Plan, stock option awards are granted with an exercise price equal to the market price of the Company’s stock at the date of grant. Commencing March 1,2011, stock option awards granted to employees generally vest 25% each year until fully vested after four years. In January 2013, the Company made retentiongrants of stock option awards and restricted stock units. These awards vest 50% each year until fully vested after two years. In August 2013 and December 2014,the Company issued 1,032 and 1,250 performance-based stock options, respectively. These awards vest upon successful completion of specific developmentmilestones. As of December 31, 2015, 75% of the August 2013 grants have vested based upon achievement of three milestones: (1) successful completion of theOPuS-1 clinical trial, for which vesting occurred in the second quarter of 2014, (2) FDA approval of RAPIVAB for which vesting occurred in the fourth quarter of2014, and (3) initiation of a Phase 1 clinical trial to evaluate the safety, pharmacokinetics and pharmacodynamics of orally-administered BCX7353 in healthyvolunteers, for which vesting occurred in the second quarter of 2015. Thus, as of December 31, 2016, 25% of the August 2013 performance-based grants and 100%of the December 2014 performance-based grants remain unvested and no compensation expense has been recognized for these portions of the previously issuedperformance-based grants. Stock option awards granted to non-employee directors of the Company generally vest monthly over one year. All stock option awardshave contractual terms of 5 to 10 years. The vesting exercise provisions of all awards granted under the Incentive Plan are subject to acceleration in the event ofcertain stockholder-approved transactions, or upon the occurrence of a change in control as defined in the Incentive Plan. Related activity under the Incentive Plan is as follows: Awards Available Options Outstanding Weighted Average Exercise PriceBalance at December 31, 2013 1,082 8,986 $4.99 Plan amendment 3,750 — — Restricted stock awards granted (593) — — Restricted stock awards cancelled — — — Stock option awards granted (1,965) 1,965 10.99 Stock option awards exercised — (1,258) 4.78 Stock option awards cancelled 88 (88) 8.83 Balance at December 31, 2014 2,362 9,605 6.21 Restricted stock awards granted (163) — — Restricted stock awards cancelled 1 — — Stock option awards granted (2,217) 2,217 11.52 Stock option awards exercised — (1,118) 4.36 Stock option awards cancelled 33 (33) 9.87 Balance at December 31, 2015 16 10,671 7.50 Plan amendment 3,800 Restricted stock awards granted (34) — — Restricted stock awards cancelled 22 — — Stock option awards granted (2,248) 2,248 3.20 Stock option awards exercised — (107) 2.63 Stock option awards cancelled 717 (717) 10.78 Balance at December 31, 2016 2,273 12,095 $6.55 65BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) For stock option awards granted under the Incentive Plan during 2016, 2015 and 2014, the fair value was estimated on the date of grant using a Black-Scholes option pricing model and the assumptions noted in the table below. The weighted average grant date fair value of these awards granted during 2016, 2015and 2014 was $2.17, $7.72 and $8.02, respectively. The fair value of the stock option awards is amortized to expense over the vesting periods using a straight-lineexpense attribution method. The following explanations describe the assumptions used by the Company to value the stock option awards granted during 2016,2015, and 2014. The expected life is based on the average of the assumption that all outstanding stock option awards will be exercised at full vesting and theassumption that all outstanding stock option awards will be exercised at the midpoint of the current date (if already vested) or at full vesting (if not yet vested) andthe full contractual term. The expected volatility represents the volatility over the most recent period corresponding with the expected life. The Company hasassumed no expected dividend yield, as dividends have never been paid to stockholders and will not be for the foreseeable future. The weighted average risk-freeinterest rate is the implied yield currently available on zero-coupon government issues with a remaining term equal to the expected term. Weighted Average Assumptions for Stock Option Awards Granted under the Incentive Plan 2016 2015 2014Expected Life 5.5 5.5 5.5 Expected Volatility 82% 81% 87%Expected Dividend Yield 0.0% 0.0% 0.0%Risk-Free Interest Rate 1.4% 1.6% 1.6% The total intrinsic value of stock option awards exercised under the Incentive Plan was $339 during 2016, $10,117 during 2015 and $8,522 during 2014. Theintrinsic value represents the total proceeds (fair market value at the date of exercise, less the exercise price, times the number of stock option awards exercised)received by all individuals who exercised stock option awards during the period. The following table summarizes, at December 31, 2016, by price range: (1) for stock option awards outstanding under the Incentive Plan, the number ofstock option awards outstanding, their weighted average remaining life and their weighted average exercise price; and (2) for stock option awards exercisableunder the Plan, the number of stock option awards exercisable and their weighted average exercise price: Outstanding ExercisableRange Number Weighted Average Remaining Life Weighted Average Exercise Price Number Weighted Average Exercise Price$0to3 1,919 5.7 $1.64 1,510 $1.53 3to6 4,749 6.9 4.02 2,578 4.48 6to9 1,153 3.5 7.10 1,118 7.11 9to12 3,457 7.2 11.10 1,074 11.29 12to15 722 8.0 12.39 195 12.73 15to18 95 8.5 15.39 24 15.39 $0to18 12,095 6.6 $6.55 6,499 $5.66 The weighted average remaining contractual life of stock option awards exercisable under the Incentive Plan at December 31, 2016 was 6.6 years. The aggregate intrinsic value of stock option awards outstanding and exercisable under the Incentive Plan at December 31, 2016 was $20,002. Theaggregate intrinsic value represents the value (the period’s closing market price, less the exercise price, times the number of in-the-money stock option awards) thatwould have been received by all stock option award holders under the Incentive Plan had they exercised their stock option awards at the end of the year. The total fair value of the stock option awards vested under the Incentive Plan was $6,380 during 2016, $4,492 during 2015 and $2,844 during 2014. As of December 31, 2016, the number of stock option awards vested and expected to vest under the Incentive Plan is 11,013. The weighted average exerciseprice of these stock option awards is $6.53 and their weighted average remaining contractual life is 6.5 years. 66BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) The following table summarizes the changes in the number and weighted-average grant-date fair value of non-vested stock option awards during 2016: Non-Vested Stock Option Awards Weighted Average Grant-Date Fair ValueBalance December 31, 2015 4,863 $6.40 Stock option awards granted 2,248 2.17 Stock option awards vested (1,278) 4.99 Stock option awards forfeited (235) 6.79 Balance December 31, 2016 5,598 $5.40 As of December 31, 2016, there was approximately $14,541 of total unrecognized compensation cost related to non-vested employee stock option awardsand restricted stock units granted by the Company. That cost is expected to be recognized as follows: $6,880 in 2017, $4,649 in 2018, $2,606 in 2019, and $406 in2020. Employee Stock Purchase Plan The Company has reserved a total of 1,475 shares of common stock to be purchased under the ESPP, of which 422 shares remain available for purchase atDecember 31, 2016. Eligible employees may authorize up to 15% of their salary to purchase common stock at the lower of 85% of the beginning or 85% of theending price during six-month purchase intervals. No more than 3 shares may be purchased by any one employee at the six-month purchase dates and no employeemay purchase stock having a fair market value at the commencement date of $25 or more in any one calendar year. There were 75, 41 and 49 shares of common stock purchased under the ESPP in 2016, 2015, and 2014, respectively, at a weighted average price per share of$4.36, $8.65 and $6.29, respectively. Expense of $147, $220 and $214 related to the ESPP was recognized during 2016, 2015, and 2014, respectively.Compensation expense for shares purchased under the ESPP related to the purchase discount and the “look-back” option were determined using a Black-Scholesoption pricing model. The weighted average grant date fair values of shares granted under the ESPP during 2016, 2015, and 2014, were $1.95, $4.93 and $4.41,respectively. Note 8 — Income Taxes The Company has incurred net losses since inception and, consequently, has not recorded any U.S. Federal and state income tax expense or benefit. Thedifferences between the Company’s effective tax rate and the statutory tax rate in 2016, 2015, and 2014 are as follows: 2016 2015 2014Income tax benefit at federal statutory rate (35%) $(19,300) $(15,057) $(15,816)State and local income taxes net of federal tax benefit (1,173) (819) (1,286)Permanent items 1,057 560 258 Rate change 1,080 1,012 22 Expiration of attribute carryforwards 559 330 373 Research and development tax credits (4,681) (10,454) (748)Orphan drug credit 1,798 4,307 — Other 822 (218) (115)Change in valuation allowance 19,838 20,339 17,312 Income tax expense $— $— $— The Company recognizes the impact of a tax position in its financial statements if it is more likely than not that the position will be sustained on audit basedon the technical merits of the position. The Company has concluded that it has an uncertain tax position pertaining to its research and development and orphan drugcredit carryforwards. The Company has established these credits based on information and calculations it believes are appropriate and the best estimate of theunderlying credit. Any changes to the Company’s unrecognized tax benefits are offset by an adjustment to the valuation allowance and there would be no impacton the Company’s financial statements. The Company does not expect its unrecognized tax benefits to change significantly over the next 12 months. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2016 2015Balance at January 1, $3,085 $472 Additions to current period tax positions 1,170 2,616 Additions to prior period tax positions — — Reductions to prior period tax provisions — (3)Balance at December 31, $4,255 $3,085 67BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) The Company’s ability to utilize the net operating loss and tax credit carryforwards in the future may be subject to substantial restrictions in the event ofpast or future ownership changes as defined in Section 382 of the Internal Revenue Code of 1986, as amended and similar state tax law. Significant components of the Company’s deferred tax assets and liabilities are as follows: 2016 2015Deferred tax assets: Net federal and state operating losses $158,618 $142,836 Research and development credits 53,231 48,551 Fixed assets — 1,054 Deferred revenue 3,484 4,240 Stock-based compensation 8,952 8,605 Other 2,849 2,590 Total deferred tax assets 227,134 207,876 Deferred tax liabilities: Fixed assets (674) — Foreign currency derivative (1,415) (2,668)Total deferred tax liabilities (2,089) (2,668) Valuation allowance (225,045) (205,208)Net deferred tax assets $— $— The majority of the Company’s deferred tax assets relate to net operating loss and research and development carryforwards that can only be realized if theCompany is profitable in future periods. It is uncertain whether the Company will realize any tax benefit related to these carryforwards. Accordingly, the Companyhas provided a full valuation allowance against the net deferred tax assets due to uncertainties as to their ultimate realization. The valuation allowance will remainat the full amount of the deferred tax assets until it is more likely than not that the related tax benefits will be realized. The Company’s valuation allowanceincreased by $19,837 in 2016, $20,339 in 2015 and $17,312 in 2014. As of December 31, 2016, the Company had federal operating loss carryforwards of $431,983, state operating loss carryforwards of $403,237, and researchand development and orphan drug credit carryforwards of $57,487, which will expire at various dates from 2017 through 2035. The federal losses begin to expirein 2018, the state losses begin to expire in 2017 and the research and development credit carryforwards begin to expire in 2018. The Company’s federal and state operating loss carryforwards include $15,655 of excess tax benefits related to a deduction from the exercise of stockoptions. The tax benefit of these deductions has not been recognized in deferred tax assets. If utilized, the benefits from these deductions will be recorded asadjustments to additional paid-in capital. Tax years 2013-2015 remain open to examination by the major taxing jurisdictions to which the Company is subject. Additionally, years prior to 2013 arealso open to examination to the extent of loss and credit carryforwards from those years. The Company recognizes interest and penalties accrued related tounrecognized tax benefits as components of its income tax provision. However, there were no provisions or accruals for interest and penalties in 2016, 2015, and2014. Note 9 — Employee 401(k) Plan In January 1991, the Company adopted an employee retirement plan (“401(k) Plan”) under Section 401(k) of the Internal Revenue Code covering allemployees. Employee contributions may be made to the 401(k) Plan up to limits established by the Internal Revenue Service. Company matching contributionsmay be made at the discretion of the Board of Directors. The Company made matching contributions of $504, $366 and $361, in 2016, 2015, and 2014,respectively. Note 10 — Collaborative and Other Research and Development Contracts U.S. Department of Health and Human Services (“BARDA/HHS”). In January 2007, the U.S. Department of Health and Human Services (“BARDA/HHS”)awarded the Company a $102,661, four-year contract for the advanced development of peramivir for the treatment of influenza. During 2009, peramivir clinicaldevelopment shifted to focus on intravenous delivery and the treatment of hospitalized patients. To support this focus, a September 2009 contract modification wasawarded to extend the i.v. peramivir program and to increase funding by $77,191. On February 24, 2011, the Company announced that BARDA/HHS had awardedit a $55,000 contract modification, intended to fund completion of the Phase 3 development of i.v. peramivir for the treatment of patients hospitalized withinfluenza. That contract modification brought the total contract award from BARDA/HHS to $234,852 and provided funding to support the filing of a NDA to seekregulatory approval for i.v. peramivir in the U.S. In December 2013, BioCryst submitted an NDA filing for i.v. peramivir to the FDA and the NDA was approvedin December 2014. The BARDA/HHS contract expired on June 30, 2014. 68BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) On March 31, 2015, the Company announced that BARDA/HHS had awarded the Company a contract for the continued development of galidesivir as apotential treatment for diseases caused by RNA pathogens, including filoviruses. This BARDA/HHS contract includes a base contract of $16,265 to supportgalidesivir drug manufacturing, as well as $22,855 in additional development options that can be exercised by the government, bringing the potential value of thecontract to $39,120. As of December 31, 2016, a total of $20,574 has been awarded under exercised options within this contract. National Institute of Allergy and Infectious Diseases (“NIAID/HHS”). In September 2013, NIAID/HHS contracted with the Company for the developmentof galidesivir as a treatment for Marburg virus disease. NIAID/HHS, part of the National Institutes of Health, made an initial award of $5,000 to the Company. Thegoals of this contract, including amendments, are to file IND applications for intravenous (“i.v.”) and intramuscular (“i.m.”) galidesivir for the treatment ofMarburg virus disease and other hemorrhagic fever virus diseases, including Ebola virus disease, and to conduct an initial Phase 1 human clinical trial. As ofDecember 31, 2016, the total NIAID/HHS contract amount to advance the program through the completion of the Phase I clinical program is $39,477. As ofDecember 31, 2016, all options have been exercised under this contract. The contracts with BARDA/HHS and NIAID/HHS are cost-plus-fixed-fee contracts. That is, the Company is entitled to receive reimbursement for all costsincurred in accordance with the contract provisions that are related to the development of galidesivir plus a fixed fee, or profit. BARDA/HHS and NIAID/HHS willmake periodic assessments of progress and the continuation of the contract is based on the Company’s performance, the timeliness and quality of deliverables, andother factors. The government has rights under certain contract clauses to terminate these contracts. These contracts are terminable by the government at any timefor breach or without cause. Seqirus UK Limited (“SUL”). On June 16, 2015, the Company and Seqirus UK Limited ("SUL"), a limited company organized under the laws of the UnitedKingdom and a subsidiary of CSL Limited, a company organized under the laws of Australia, entered into a License Agreement (the "SUL Agreement") grantingSUL and its affiliates worldwide rights to develop, manufacture and commercialize RAPIVAB (peramivir injection) for the treatment of influenza except for therights to conduct such activities in Israel, Japan, Korea and Taiwan (the permitted geographies together constituting the "Territory"). Peramivir is an intravenoustreatment for acute uncomplicated influenza and is currently approved for use in the United States, Canada, Japan, Taiwan and Korea. Peramivir is the first andonly intravenous influenza treatment in the world and was approved by the U.S. Food and Drug Administration in December 2014 for the treatment of acuteuncomplicated influenza in patients 18 years and older who have been symptomatic for no more than two days. The Company retains all rights and associatedeconomics to procure pandemic stockpiling orders for RAPIVAB from the U.S. Government, while SUL has the right to pursue government stockpiling outside theU.S. Pursuant to the SUL Agreement, RAPIVAB will be commercialized by CSL's subsidiary, SUL, which specializes in influenza prevention through thesupply of seasonal and pandemic vaccine to global markets. SUL will manufacture, commercialize and exercise decision-making authority with respect to thedevelopment and commercialization of RAPIVAB within the Territory and be responsible for all related costs, including sales and promotion. Under the terms of the SUL Agreement, the Company is responsible for fulfilling all post-marketing approval commitments in connection with the FDA'sapproval of the NDA, and upon fulfillment will transfer ownership of and financial responsibility for the NDA to SUL. Pursuant to potential rights to sellRAPIVAB in Canada and the EU, the Company is also responsible for regulatory filings and interactions with the Health Canada and the European MedicinesAgency ("EMA") until marketing approval for RAPIVAB is obtained and assigned to SUL. In accordance with the SUL Agreement, the Company and SULformed a joint steering committee, composed of an equal number of representatives from each party, to oversee, review and coordinate the conduct and progress ofthe commercialization of RAPIVAB in the Territory and any additional development. Under the terms of the SUL Agreement, the Company received an upfront payment of $33,740, and may receive up to $12,000 in additional milestonepayments related to the successful achievement of regulatory milestones, including marketing approval (i) by the FDA for a pediatric indication, (ii) by the EMAfor an adult indication in the EU and (iii) by Health Canada for an adult indication in Canada. The Company is also entitled under the SUL Agreement to receivetiered royalties at a percentage rate beginning in the mid-teens contingent upon meeting minimum thresholds of net sales, as well as a low-thirties percentage of thegross profit from government stockpiling purchases made outside the U.S. Specifically, the Company receives tiered royalties at a percentage rate in the mid-teensto low-forties on net sales in the U.S. during a Contract Year (defined as July 1 - June 30) and tiered royalties at a percentage rate in the mid-teens to mid-twentieson net sales in the Territory, other than in the U.S., during a Calendar Year, each subject to certain downward adjustments for circumstance or events impacting theoverall market opportunity. SUL's royalty payment obligations commence on the date of the SUL Agreement and expire, on a country-by-country basis, upon thelater of (i) the expiration of legal exclusivity in such country and (ii) ten years from the date of the SUL Agreement (the "Royalty Term"). The Company developedperamivir under a license from UAB and will owe sublicense payments to them on any future milestone payments and/or royalties received by the Company fromSUL. 69BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Shionogi & Co., Ltd. (“Shionogi”). In February 2007, the Company entered into an exclusive license agreement with Shionogi to develop andcommercialize peramivir in Japan for the treatment of seasonal and potentially life-threatening human influenza. Under the terms of the agreement, Shionogiobtained rights to injectable formulations of peramivir in Japan. The Company developed peramivir under a license from UAB and will owe sublicense paymentsto them on any future milestone payments and/or royalties received by the Company from Shionogi. In October 2008, the Company and Shionogi amended thelicense agreement to expand the territory covered by the agreement to include Taiwan. Shionogi has commercially launched peramivir under the commercial nameRAPIACTA in Japan and Taiwan. Green Cross Corporation (“Green Cross”). In June 2006, the Company entered into an agreement with Green Cross to develop and commercializeperamivir in Korea. Under the terms of the agreement, Green Cross will be responsible for all development, regulatory, and commercialization costs in Korea. TheCompany received a one-time license fee of $250. The license also provides that the Company will share in profits resulting from the sale of peramivir in Korea,including the sale of peramivir to the Korean government for stockpiling purposes. Furthermore, Green Cross will pay the Company a premium over its cost tosupply peramivir for development and any future marketing of peramivir products in Korea. Mundipharma International Holdings Limited (“Mundipharma”). In February 2006, the Company entered into an exclusive, royalty bearing right andlicense agreement with Mundipharma for the development and commercialization of forodesine, a Purine Nucleoside Phosphorylase (“PNP”) inhibitor, for use inoncology (the “Original Agreement”). Under the terms of the Original Agreement, Mundipharma obtained rights to forodesine in markets across Europe, Asia, andAustralasia in exchange for a $10,000 up-front payment. The Company deferred revenue recognition of the $10,000 up-front payment that was received from Mundipharma in February 2006 because the Companywas involved in the continued development of forodesine. Amortization of this revenue commenced in February 2006 and was initially scheduled to end in October2017, which is the date of expiration for the last-to-expire patent covered by the agreement. The Company also deferred revenue recognition of a $5,000 paymentreceived from Mundipharma in connection with the initiation of a clinical trial in 2007. Amortization of this revenue commenced in 2007 and was initiallyscheduled to end in October 2017. Under its agreement with AECOM/IRL, the Company paid sublicense payments related to these upfront cash payments receivedfrom Mundipharma. Expense recognition of these sublicense payments was deferred and recognized under the same term as the related deferred revenue. On November 11, 2011, the Company entered into the Amended and Restated License and Development Agreement (the “Amended and RestatedAgreement”) with Mundipharma, amending and restating the Original Agreement. Under the terms of the Amended and Restated Agreement, Mundipharmaobtained worldwide rights to forodesine. Commencing on November 11, 2011, Mundipharma controls the development and commercialization of forodesine andassumes all future development and commercialization costs. The Amended and Restated Agreement provides for the possibility of future event payments totaling$15,000 for achieving specified regulatory events for certain indications and tiered royalties ranging from mid to high single-digit percentages of net product salesin each country where forodesine is sold by Mundipharma. These royalties are subject to downward adjustments based on the then-existing patent coverage and/orthe availability of generic compounds in each country. The Amended and Restated Agreement is a multiple element arrangement for accounting purposes, in which the Company is required to deliver toMundipharma both the worldwide rights to forodesine in the field of oncology and the transfer of product data and know-how to permit Mundipharma to developand commercialize forodesine (the “Knowledge Transfer”). The Company accounted for these elements as a combined unit of accounting as they do not havestand-alone value to Mundipharma. The worldwide license rights were granted to Mundipharma on November 11, 2011 and the Knowledge Transfer wascompleted during the first quarter of 2012. Upon completion of the Knowledge Transfer, the remaining deferred revenue and deferred expense was recognized infull. Albert Einstein College of Medicine of Yeshiva University and Industrial Research, Ltd. (“AECOM” and “IRL” respectively). In June 2000, the Companylicensed a series of potent inhibitors of PNP from AECOM and IRL, (collectively, the “Licensors”). The lead product candidates from this collaboration areforodesine and ulodesine. The Company has obtained worldwide exclusive rights to develop and ultimately distribute these, or any other, product candidates thatmight arise from research on these inhibitors. The Company has the option to expand the Agreement to include other inventions in the field made by theinvestigators or employees of the Licensors. The Company agreed to use commercially reasonable efforts to develop these drugs. In addition, the Company hasagreed to pay certain milestone payments for each licensed product (which range in the aggregate from $1,400 to almost $4,000 per indication) for futuredevelopment of these inhibitors, single digit royalties on net sales of any resulting product made by the Company, and to share approximately one quarter of futurepayments received from other third-party partners, if any. In addition, the Company has agreed to pay annual license fees, which can range from $150 to $500, thatare creditable against actual royalties and other payments due to the Licensors. This agreement may be terminated by the Company at any time by giving 60 daysadvance notice or in the event of material uncured breach by the Licensors. 70BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) In May 2010, the Company amended the licensee agreement through which the Company obtained worldwide exclusive rights to develop and ultimatelydistribute any product candidates that might arise from research on a series of PNP inhibitors, including forodesine and ulodesine. Under the terms of theamendment, the Licensors agreed to accept a reduction of one-half in the percentage of future payments received from third-party sub licensees of the licensedPNP inhibitors that must be paid to the Licensors. This reduction does not apply to (i) any milestone payments the Company may receive in the future under itslicense agreement dated February 1, 2006 with Mundipharma and (ii) royalties received from its sub licensees in connection with the sale of licensed products, forwhich the original payment rate will remain in effect. The rate of royalty payments to the Licensors based on net sales of any resulting product made by theCompany remains unchanged. In consideration for these modifications in 2010, the Company issued to the Licensors shares of its common stock with an aggregate value of $5,911 andpaid the Licensors $90 in cash. Additionally, at the Company’s sole option and subject to certain agreed upon conditions, any future non-royalty payments due tobe paid by it to the Licensors under the license agreement may be made either in cash, in shares of its common stock, or in a combination of cash and shares. On November 17, 2011, the Company further amended its agreements with the Licensors whereby the Licensors agreed to accept a reduction of one-half inthe percentage of Net Proceeds (as defined) received by the Company under its Amended and Restated Agreement with Mundipharma that will be paid toAECOM/IRL. On June 19, 2012, the Company further amended its agreements with AECOM/IRL whereby the parties clarified the definition of the field with respect toPNP inhibition and AECOM/IRL agreed to exclusive worldwide license of galidesivir to BioCryst for any antiviral use. At its sole option and subject to certain agreed upon conditions, any future non-royalty payments due to be paid by the Company to AECOM/IRL under thelicense agreement may be made either in cash, in shares of the Company’s common stock, or in a combination of cash and shares. On January 6, 2014, the Carbohydrate Chemistry Research Team from Callaghan Innovation Research Limited, formerly Industrial Research Limited,transferred to Victoria University of Wellington (“VUW”) to establish the Ferrier Research Institute. The intellectual property rights relating to this research team,and the contracts relating to that intellectual property were transferred to a wholly owned subsidiary of VUW, including the contracts to which BioCryst is a party.The parties executed novation agreements in order to effectuate the transfer. Except for a substitution of parties, the terms and conditions of the contracts aresubstantially the same The University of Alabama at Birmingham (“UAB”). The Company currently has agreements with UAB for influenza neuraminidase and complementinhibitors. Under the terms of these agreements, UAB performed specific research for the Company in return for research payments and license fees. UAB hasgranted the Company certain rights to any discoveries in these areas resulting from research developed by UAB or jointly developed with the Company. TheCompany has agreed to pay single digit royalties on sales of any resulting product and to share in future payments received from other third-party partners. TheCompany has completed the research under the UAB agreements. These two agreements have initial 25-year terms, are automatically renewable for five-yearterms throughout the life of the last patent and are terminable by the Company upon three months’ notice and by UAB under certain circumstances. Upontermination both parties shall cease using the other parties’ proprietary and confidential information and materials, the parties shall jointly own joint inventions andUAB shall resume full ownership of all UAB licensed products. There is currently no activity between the Company and UAB on these agreements, but when theCompany licenses this technology, such as in the case of the Shionogi, Green Cross and SUL agreements, or commercializes products related to these programs,the Company will owe sublicense fees or royalties on amounts it receives. Note 11 — Quarterly Financial Information (Unaudited) First Second Third Fourth2016 Quarters Revenues $4,820 $4,787 $7,763 $8,983 Net Loss (22,832) (16,281) (11,528) (4,503)Basic and diluted net loss per share (0.31) (0.22) (0.16) (0.06)2015 Quarters Revenues $6,826 $25,842 $10,987 $4,602 Net (Loss) Income (15,164) 4,901 (14,621) (18,135)Basic net (loss) income per share (0.21) 0.07 (0.20) (0.25)Diluted net (loss) income per share (0.21) 0.06 (0.20) (0.25) 71BIOCRYST PHARMACEUTICALS, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(In thousands, except per share amounts) Note 12 — Recent Accounting Pronouncements In November 2016 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2016-18: Statement of Cash Flows (Topic230): Restricted Cash (“ASU 2016-18”). The new standard requires that a statement of cash flows explain the change during the period in the total of cash, cashequivalents and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash andrestricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown onthe statement of cash flows. The standard is effective for annual periods beginning after December 15, 2017, and interim periods within those annual reportingperiods. Early adoption is permitted. The Company is currently evaluating the impact of this update on its consolidated financial statements. In August 2016, the FASB issued Accounting Standards Update No. 2016-15: Statement of Cash Flows (Topic 230): Classification of Certain CashReceipts and Cash Payments (“ASU 2016-15”). The amendments in this update clarify how entities should classify certain cash receipts and cash payments on theConsolidated Statements of Cash Flows. The new guidance also clarifies how the predominance principle should be applied when cash receipts and cash paymentshave aspects of more than one class of cash flows. ASU 2016-15 will be effective for annual periods beginning after December 15, 2017, including interim periodswithin those annual reporting periods, but early adoption is permitted. The Company is currently evaluating the impact of this update on its consolidated financialstatements. In March 2016, the FASB issued Accounting Standards Update No. 2016-09: Compensation - Stock Compensation (Topic 718): Improvements to EmployeeShare-Based Payment Accounting (“ASU 2016-09”). The amendments in this update simplify several aspects of the accounting for employee share-based paymenttransactions, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cashflows. ASU 2016-09 will be effective for the Company in fiscal year 2017, but early adoption is permitted. The Company is currently evaluating the impact of thisupdate on its consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02: Leases (Topic 842) (“ASU 2016-02”). The amendments in this updaterequire lessees, among other things, to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previousauthoritative guidance. This update also introduces new disclosure requirements for leasing arrangements. ASU 2016-02 will be effective for the Company in fiscalyear 2019, but early adoption is permitted. The Company is currently evaluating the impact of this update on its consolidated financial statements. In January 2016, the FASB issued Accounting Standards Update No. 2016-01: Financial Instruments - Overall (Subtopic 825-10): Recognition andMeasurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). The amendments in this update address certain aspects of recognition, measurement,presentation and disclosure of financial instruments. In particular, the amendments in this update supersede, for public business entities, the requirement to disclosethe methods and significant assumptions used in calculating the fair value of financial instruments required to be disclosed for financial instruments measured atamortized cost on the balance sheet. ASU 2016-01 will be effective for the Company in fiscal year 2018, but early adoption is permitted. The Company does notexpect this standard to have a material impact on its consolidated financial statements. In July 2015, the FASB issued Accounting Standards Update No. 2015-11: Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”), which changes the measurement principle for inventory from the lower of cost or market to the lower of cost and net realizable value. ASU 2015-11 definesnet realizable value as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation.The update does not apply to inventory that is measured using last-in, first-out or the retail inventory method. The update applies to all other inventory, whichincludes inventory that is measured using first-in, first-out or average cost methods. The amendments in ASU 2015-11 will be effective for the Company for fiscalyears, and the interim periods within those years, beginning after December 15, 2016. The amendments must be applied prospectively and early adoption ispermitted. The Company does not expect this standard to have a material impact on its consolidated financial statements. In May 2014, the FASB issued Standards Update No. 2014-09: Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which provides asingle, comprehensive revenue recognition model for all contracts with customers. The core principal of this ASU is that an entity should recognize revenue whenit transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for thosegoods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising fromcustomer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In July 2015,the FASB finalized a one year delay in the effective date of this standard, which will now be effective January 1, 2018; however, early adoption is permitted anytime after the original effective date, January 1, 2017. The Company is not electing early adoption. Companies can transition to the new standard under the fullretrospective method or the modified retrospective method. The Company is currently evaluating the impact this standard will have on its consolidated financialstatements. 72 Report of Independent Registered Public Accounting Firm The Board of Directors and StockholdersBioCryst Pharmaceuticals, Inc. We have audited the consolidated balance sheets of BioCryst Pharmaceuticals, Inc. as of December 31, 2016 and 2015, and the related consolidatedstatements of comprehensive loss, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2016. These financialstatements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements 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 thatwe plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includesexamining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principlesused and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide areasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of BioCrystPharmaceuticals, Inc. at December 31, 2016 and 2015, and the consolidated results of its operations and its cash flows for each of the three years in the periodended December 31, 2016, in conformity with U.S. generally accepted accounting principles. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), BioCryst Pharmaceuticals,Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established in Internal Control-Integrated Framework issued by theCommittee of Sponsoring Organizations of the Treadway Commission (2013 Framework) and our report dated February 27, 2017 expressed an unqualified opinionthereon. /s/ Ernst & Young LLP Raleigh, North Carolina February 27, 2017 73 Report of Independent Registered Public Accounting Firm The Board of Directors and StockholdersBioCryst Pharmaceuticals, Inc. We have audited BioCryst Pharmaceuticals, Inc.’s internal control over financial reporting as of December 31, 2016, based on criteria established inInternal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) (the COSOcriteria). BioCryst Pharmaceuticals, Inc.’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment ofthe effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting.Our responsibility is to express an opinion on 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 thatwe plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all materialrespects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing andevaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessaryin 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 reportingand the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control overfinancial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect thetransactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation offinancial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only inaccordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection ofunauthorized 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 ofeffectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance withthe policies or procedures may deteriorate. In our opinion, BioCryst Pharmaceuticals, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31,2016, 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 sheetsof BioCryst Pharmaceuticals, Inc. as of December 31, 2016 and 2015, and the related consolidated statements of comprehensive loss, stockholders’ equity, andcash flows for each of the three years in the period ended December 31, 2016 of BioCryst Pharmaceuticals, Inc. and our report dated February 27, 2017 expressedan unqualified opinion thereon. /s/ Ernst & Young LLP Raleigh, North Carolina February 27, 2017 74 ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE None. ITEM 9A.CONTROLS AND PROCEDURES Evaluation of Disclosure Controls and Procedures We maintain a set of disclosure controls and procedures that are designed to ensure that information relating to BioCryst Pharmaceuticals, Inc. required tobe disclosed in our periodic filings under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reportedin a timely manner under the Exchange Act of 1934. We carried out an evaluation as required by paragraph (b) of Rule 13a-15 or Rule 15d-15 under the ExchangeAct, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of thedesign and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15 under the Exchange Act). Based upon that evaluation,the Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2016, our disclosure controls and procedures are effective. We believethat our disclosure controls and procedures will ensure that information required to be disclosed in the reports filed or submitted by us under the Exchange Act isrecorded, processed, summarized and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission, and includecontrols and procedures designed to ensure that information required to be disclosed by us in such reports is accumulated and communicated to our management,including our Chairman and Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Management’s Report on Internal Control Over Financial Reporting Management of BioCryst Pharmaceuticals, Inc. is responsible for establishing and maintaining adequate internal control over financial reporting and for theassessment of the effectiveness of internal control over financial reporting. As defined by the Securities and Exchange Commission, internal control over financialreporting is a process designed by, or under the supervision of our principal executive and principal financial officers and effected by our Board of Directors,management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the financial statements inaccordance with U.S. GAAP. Our internal control over financial reporting is supported by written policies and procedures that (1) pertain to the maintenance of records that, in reasonabledetail, accurately and fairly reflect our transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary topermit preparation of the financial statements in accordance with U.S. GAAP, and that our receipts and expenditures are being made only in accordance withauthorizations of our management and directors; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use ordisposition of our 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 ofeffectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance withthe policies or procedures may deteriorate. In connection with the preparation of our annual financial statements, management has undertaken an assessment of the effectiveness of our internal controlover financial reporting as of December 31, 2016, based on criteria established in Internal Control — Integrated Framework issued by the Committee ofSponsoring Organizations of the Treadway Commission (2013 Framework) (the COSO Framework). Management’s assessment included an evaluation of thedesign of our internal control over financial reporting and testing of the operational effectiveness of those controls. Based on this assessment, management has concluded that as of December 31, 2016, our internal control over financial reporting was effective.Management believes our internal control over financial reporting will provide reasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance with U.S. GAAP. Ernst & Young LLP, the independent registered public accounting firm that audited our financial statements included in this report, has issued an attestationreport on the Company’s internal control over financial reporting, a copy of which appears on page 80 of this annual report. Changes in Internal Control over Financial Reporting There have been no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2016 that have materiallyaffected, or are reasonably likely to materially affect, our internal control over financial reporting. 75 ITEM 9B.OTHER INFORMATION None. PART III ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE The information required by this item is set forth under the captions “Items to be Voted on — 1. Election of Directors,” “Executive Officers,”“Section 16(a) Beneficial Ownership Reporting Compliance” and “Corporate Governance” in our definitive Proxy Statement for the 2017 Annual Meeting ofStockholders and incorporated herein by reference. ITEM 11.EXECUTIVE COMPENSATION The information required by this item is set forth under the captions “Compensation Discussion and Analysis,” “Summary Compensation Table,” “Grantsof Plan-Based Awards in 2016,” “Outstanding Equity Awards at December 31, 2016,” “2016 Option Exercises and Stock Vested,” “Potential Payments UponTermination or Change in Control,” “2016 Director Compensation,” “Compensation Committee Interlocks and Insider Participation” and “CompensationCommittee Report” in our definitive Proxy Statement for the 2017 Annual Meeting of Stockholders and incorporated herein by reference. ITEM 12.SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS The information required by this item is set forth under the captions “Equity Compensation Plan Information” and “Security Ownership of CertainBeneficial Owners and Management” in our definitive Proxy Statement for the 2017 Annual Meeting of Stockholders and incorporated herein by reference. ITEM 13.CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE The information required by this item is set forth under the captions “Certain Relationships and Related Transactions” and “Corporate Governance” in ourdefinitive Proxy Statement for the 2017 Annual Meeting of Stockholders and incorporated herein by reference. ITEM 14.PRINCIPAL ACCOUNTING FEES AND SERVICES The information required by this item is set forth under the caption “Ratification of Appointment of Independent Registered Public Accountants” in ourdefinitive Proxy Statement for the 2017 Annual Meeting of Stockholders and incorporated herein by reference. PART IV ITEM 15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES (a) Financial Statements The following financial statements appear in Item 8 of this Form 10-K: Page in Form 10-KConsolidated Balance Sheets at December 31, 2016 and 2015 49 Consolidated Statements of Comprehensive Loss for the years ended December 31, 2016, 2015 and 2014 50 Consolidated Statements of Cash Flows for the years ended December 31, 2016, 2015 and 2014 51 Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2016, 2015 and 2014 52 Notes to Consolidated Financial Statements 53 Report of Independent Registered Public Accounting Firm on Consolidated Financial Statements 73 Report of Independent Registered Public Accounting Firm on Internal Control 74 No financial statement schedules are included because the information is either provided in the consolidated financial statements or is not required under therelated instructions or is inapplicable and such schedules therefore have been omitted. (b) Exhibits. See Index of Exhibits. 76 SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on itsbehalf by the undersigned, thereunto duly authorized on February 27, 2017. BIOCRYST PHARMACEUTICALS, INC. By: /s/ Jon P. Stonehouse Jon P. Stonehouse Chief Executive Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrantand in the capacities indicated on February 27, 2017: Signature Title(s) /s/ Jon P. Stonehouse President, Chief Executive Officer and Director(Jon P. Stonehouse) (Principal Executive Officer) /s/ Thomas R. Staab II Senior Vice President, Chief Financial Officer andTreasurer(Thomas R. Staab II) (Principal Financial Officer and PrincipalAccounting Officer) /s/ George B. Abercrombie Director(George B. Abercrombie) /s/ Fred E. Cohen Director(Fred E. Cohen, M.D., D. Phil) /s/ Stanley C. Erck Director(Stanley C. Erck) /s/ Nancy Hutson Director(Nancy Hutson, Ph.D.) /s/ Robert A. Ingram Director(Robert A. Ingram) /s/ Kenneth B. Lee, Jr. Director(Kenneth B. Lee, Jr.) /s/ Sanj K. Patel Director(Sanj K. Patel) 77 INDEX TO EXHIBITS Number Description 3.1 Third Restated Certificate of Incorporation of Registrant. Incorporated by reference to Exhibit 3.1 to the Company’s Form 8-K filed December 22,2006. 3.2 Certificate of Amendment to the Third Restated Certificate of Incorporation of Registrant. Incorporated by reference to Exhibit 3.1 to the Company’sForm 8-K filed July 24, 2007. 3.3 Certificate of Amendment to the Third Restated Certificate of Incorporation of Registrant. Incorporated by reference to Exhibit 3.1 to the Company’sForm 8-K filed May 8, 2014. 3.4 Certificate of Increase of Authorized Number of Shares of Series B Junior Participating Preferred Stock. Incorporated by reference to Exhibit 3.1 tothe Company’s Form 8-K filed November 4, 2008. 3.5 Certificate of Increase of Authorized Number of Shares of Series B Junior Participating Preferred Stock. Incorporated by reference to Exhibit 3.2 tothe Company’s Form 8-K filed May 8, 2014. 3.6 Amended and Restated Bylaws of Registrant effective October 29, 2008. Incorporated by reference to Exhibit 3.2 to the Company’s Form 8-K filedNovember 4, 2008. 4.1 Indenture, dated as of March 9, 2011 by and between JPR Royalty Sub LLC and U.S. Bank National Association, as trustee. Incorporated byreference to Exhibit 4.3 of the Company’s Form 10-Q filed May 6, 2011. 10.1& Amended and Restated Stock Incentive Plan dated March 29, 2012. Incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K, filed May25, 2012. 10.2& Amended and Restated Stock Incentive Plan dated March 8, 2014. Incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed May 5,2014. 10.3& Amended and Restated Stock Incentive Plan, dated April 4, 2016. Incorporated by reference to Exhibit 10.1 to the Company’s Registration Statementon Form S-8, filed May 23, 2016. 10.4& Amended and Restated Employee Stock Purchase Plan dated March 29, 2012. Incorporated by reference to the Company’s Form 8-K, filed May 25,2012. 10.5& Amended and Restated Employee Stock Purchase Plan dated March 8, 2014. Incorporated by reference to Exhibit 10.2 to the Company’s Form 8-Kfiled May 5, 2014. 10.6& Form of Notice of Grant of Non-Employee Director Automatic Stock Option and Stock Option Agreement. Incorporated by reference to Exhibit 10.4of the Company’s Form 10-K filed March 4, 2008. 10.7& Form of Notice of Grant of Stock Option and Stock Option Agreement. Incorporated by reference to Exhibit 10.5 of the Company’s Form 10-K filedMarch 4, 2008. 10.8& Form of Notice of Grant of Stock Option and Stock Option Agreement. Incorporated by reference to Exhibit 10.7 of the Company’s Form 10-K filedMarch 2, 2015. 10.9& Form of Notice of Grant of Restricted Stock Unit Award and Restricted Stock Unit Agreement. Incorporated by reference to Exhibit 10.8 of theCompany’s Form 10-K filed March 2, 2015. 10.10& Annual Incentive Plan. Incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed March 12, 2012. 10.11& Executive Relocation Policy. Incorporated by reference to Exhibit 10.2 of the Company’s Form 10-K filed March 4, 2008. 10.12& Amended and Restated Employment Letter Agreement dated February 14, 2007, by and between the Company and Jon P. Stonehouse. Incorporatedby reference to Exhibit 10.12 to the Company’s Form 10-K for the year ended December 31, 2006, filed March 14, 2007. 78 10.13& Employment Letter Agreement between BioCryst Pharmaceuticals, Inc. and Thomas R. Staab II, dated May 23, 2011. Incorporated by reference toExhibit 10.1 of the Company’s Form 8-K filed May 25, 2011. 10.14& Employment Letter Agreement between BioCryst Pharmaceuticals, Inc. and William P. Sheridan dated June 12, 2008. Incorporated by reference toExhibit 10.27 of the Company’s Form 10-Q filed August 8, 2008. 10.15& Employment Letter Agreement between BioCryst Pharmaceuticals, Inc. and Yarlagadda S. Babu dated April 27, 2012. 10.16& Employment Letter Agreement between BioCryst Pharmaceuticals, Inc. and Alane P. Barnes dated August 8, 2013. 10.17& Employment Letter Agreement between BioCryst Pharmaceuticals, Inc. and Lynne Powell dated December 30, 2015. Incorporated by reference toExhibit 10.16 of the Company’s Form 10-K filed March 2, 2015. 10.18# Agreement dated January 3, 2007, between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services, as amended byAmendment number 1 dated January 3, 2007 and Amendment number 2 dated May 11, 2007. Incorporated by reference to Exhibit 10.3 to theCompany’s Form 10-Q filed August 9, 2007. (Portions omitted pursuant to request for confidential treatment.) 10.19 Amendment #3 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services, dated October 2, 2007.Incorporated by reference to Exhibit 10.6 of the Company’s Form 10-K filed March 4, 2008. 10.20 Amendment #4 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated April 3, 2008.Incorporated by reference to Exhibit 10.29 of the Company’s Form 10-Q filed August 8, 2008. 10.21 Amendment #5 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated July 2, 2008.Incorporated by reference to Exhibit 10.30 of the Company’s Form 10-Q filed August 8, 2008. 10.22 Amendment #6 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated August 18, 2008.Incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed November 7, 2008. 10.23 Amendment #7 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated November 17,2008. Incorporated by reference to Exhibit 10.12 of the Company’s Form 10-K filed March 6, 2009. 10.24 Amendment #8 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated March 13, 2009.Incorporated by reference to Exhibit 10.13 of the Company’s Form 10-K filed March 9, 2010. 10.25 Amendment #9 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Department of Health and Human Services dated September 18,2009. Incorporated by reference to Exhibit 10.1 of the Company’s Form 10-Q filed November 6, 2009. 10.26 Amendment #10 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated October 15, 2009.Incorporated by reference to Exhibit 10.2 of the Company’s Form 10-Q filed November 6, 2009. 10.27 Amendment #11 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated February 23, 2011.Incorporated by reference to Exhibit 10.25 of the Company’s Form 10-K filed March 15, 2011. 10.28 Stop-Work Order from U.S. Department of Health and Human Services, dated March 26, 2013, relating to Agreement dated January 3, 2007 betweenthe Company and the U.S. Department of Health and Human Services. Incorporated by reference to Exhibit 10.1 of the Company’s Form 10-Q filedMay 9, 2013. 10.29 Amendment #13 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated February 15, 2012. 10.30 Amendment #14 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated June 4, 2013. Incorporated byreference to Exhibit 10.1 of the Company’s Form 10-Q filed June 5, 2013. 10.31# Amendment #15 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated September 5, 2013.Incorporated by reference to Exhibit 10.1 of the Company’s Form 10-Q filed November 8, 2013. (Portions omitted pursuant to request forconfidential treatment.) 10.32 Amendment #16 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated December 17, 2013.Incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed December 23, 2013. 10.33 Amendment #17 to the Agreement between the Company and the U.S. Department of Health & Human Services, dated February 21, 2014.Incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed February 26, 2014. 79 10.34 Order for Supplies or Services from the U.S. Department of Health & Human Services, dated November 4, 2009. Incorporated by reference to Exhibit10.16 of the Company’s Form 10-K filed March 9, 2010. 10.35 Amendment #18 to the Agreement between BioCryst Pharmaceuticals, Inc. and the U.S. Department of Health and Human Services, dated March 28,2014. Incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed April 3, 2014. 10.36 Amendment #19 to the Agreement between BioCryst Pharmaceuticals, Inc. and the U.S. Department of Health and Human Services, dated April 29,2014. Incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed May 2, 2014. 10.37 Amendment #20 to the Agreement to the Agreement between BioCryst Pharmaceuticals, Inc. and the U.S. Department of Health and Human Services,dated May 30, 2014. Incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed June 5, 2014. 10.38# License, Development and Commercialization Agreement dated as of February 28, 2007, by and between the Company and Shionogi & Co., Ltd.Incorporated by reference to Exhibit 10.4 to the Company’s Form 10-Q filed May 10, 2007. (Portions omitted pursuant to request for confidentialtreatment.) 10.39# First Amendment to License, Development and Commercialization Agreement, effective as of September 30, 2008, between the Company and Shionogi& Co., Ltd. Incorporated by reference to Exhibit 10.19 to the Company’s Form 10-K filed March 6, 2009. (Portions omitted pursuant to request forconfidential treatment.) 10.40 Riverchase Business Park Warehouse Lease dated July 12, 2000 between RBP, LLC an Alabama Limited Liability Company and the Registrant foroffice/warehouse space. Incorporated by reference to Exhibit 10.8 to the Company’s Form 10-Q for the second quarter ending June 30, 2000 filedAugust 8, 2000. 10.41 Third Amendment to Lease Agreement dated August 7, 2007, by and between Riverchase Capital LLC, a Florida limited liability company, StowRiverchase, LLC, a Florida limited liability company, as successor landlord to RBP, LLC and the Company. Incorporated by reference to Exhibit 10.4of the Company’s Form 10-Q filed August 9, 2007. 10.42 Fourth Amendment to the Lease Agreement dated February 1, 2012, by and between Riverchase Capital LLC, a Florida limited liability company, StowRiverchase, LLC, a Florida limited liability company, as successor landlord to RBP, LLC and the Company. Incorporated by reference to Exhibit 10.27of the Company’s Form 10-K filed March 11, 2013. 10.43 Fifth Amendment to Lease Agreement dated January 15, 2015, by and between Riverchase Capital LLC, a Florida limited liability company, StowRiverchase, LLC, a Florida limited liability company, as successor landlord to RBP, LLC and the Company. Incorporated by reference to Exhibit 10.42of the Company’s Form 10-K filed March 2, 2015. 10.44 Stock and Warrant Purchase Agreement dated as of August 6, 2007, by and among BioCryst Pharmaceuticals, Inc. and each of the Investors identifiedon the signature pages thereto. Incorporated by reference to Exhibit 4.1 of the Company’s Form 8-K filed August 7, 2007. 10.45 Stock Purchase Agreement, dated as of February 17, 2005, by and among BioCryst Pharmaceuticals, Inc., Baker Bros. Investments, L.P., Baker BiotechFund II, L.P., Baker Bros. Investments II, L.P., Baker Biotech Fund II (Z), L.P., Baker/Tisch Investments, L.P., Baker Biotech Fund III, L.P., BakerBiotech Fund I, L.P., Baker Biotech Fund III (Z), L.P. and 14159, L.P. Incorporated by reference to Exhibit 4.1 to the Company’s Form 8-K filedFebruary 17, 2005. 10.46# Development and License Agreement dated as of February 1, 2006, by and between BioCryst Pharmaceuticals, Inc. and Mundipharma InternationalHoldings Limited. Incorporated by reference to Exhibit 10.2 to the Company’s Form 8-K/A filed May 2, 2006. (Portions omitted pursuant to request forconfidential treatment.) 10.47# Amended and Restated Development and License Agreement, dated as of November 11, 2011, by and between BioCryst Pharmaceuticals, Inc. andMundipharma International Corporation Limited. Incorporated by reference to Exhibit 10.32 to the Company’s Form 10-K filed March 6, 2012.(Portions omitted pursuant to request for confidential treatment.) 10.48# License Agreement dated as of June 27, 2000, by and among Albert Einstein College of Medicine, Industrial Research, Ltd. and BioCrystPharmaceuticals, Inc., as amended by the First Amendment Agreement dated as of July 26, 2002 and the Second Amendment Agreement dated as ofApril 15, 2005. Incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed November 30, 2005. (Portions omitted pursuant to requestfor confidential treatment.) 10.49# Third Amendment Agreement by and among Albert Einstein College of Medicine, Industrial Research, Ltd. and BioCryst Pharmaceuticals, Inc., datedas of December 11, 2009. Incorporated by reference to Exhibit 10.33 to the Company’s Form 10-K filed March 9, 2010. (Portions omitted pursuant torequest for confidential treatment.) 80 10.50# Fourth Amendment Agreement by and among Albert Einstein College of Medicine, Industrial Research, Ltd. and BioCryst Pharmaceuticals, Inc., datedas of May 5, 2010. Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed August 6, 2010. (Portions omitted pursuant to requestfor confidential treatment.) 10.51# Fifth Amendment Agreement by and among Albert Einstein College of Medicine, Industrial Research, Ltd. and BioCryst Pharmaceuticals, Inc., datedas of November 17, 2011. Incorporated by reference to Exhibit 10.36 to the Company’s Form 10-K filed March 6, 2012. (Portions omitted pursuant torequest for confidential treatment.) 10.52# Sixth Amendment Agreement by and among Albert Einstein College of Medicine, Industrial Research, Ltd. and BioCryst Pharmaceuticals, Inc., datedas of June 19, 2012. Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed August 8, 2012. (Portions omitted pursuant to requestfor confidential treatment.) 10.53 Novation Agreement among Albert Einstein College of Medicine of Yeshiva University, BioCryst Pharmaceuticals, Inc., Mundipharma InternationalCorporation Limited, Callaghan Innovation Research Limited, and Victoria Link Limited, dated May 18, 2015. Incorporated by reference to Exhibit10.6 to the Company’s Form 10-Q filed August 7, 2015. 10.54 Novation Agreement among Albert Einstein College of Medicine of Yeshiva University, BioCryst Pharmaceuticals, Inc., Callaghan InnovationResearch Limited, and Victoria Link Limited, dated June 24, 2015. Incorporated by reference to Exhibit 10.7 to the Company’s Form 10-Q filedAugust 7, 2015. 10.55 Purchase and Sale Agreement, dated as of March 9, 2011 between BioCryst Pharmaceuticals, Inc. and JPR Royalty Sub LLC. Incorporated by referenceto Exhibit 10.1 of the Company’s Form 10-Q filed May 6, 2011. 10.56 Pledge and Security Agreement, dated as of March 9, 2011 between BioCryst Pharmaceuticals, Inc. and U.S. Bank National Association, as trustee.Incorporated by reference to Exhibit 10.2 of the Company’s Form 10-Q filed May 6, 2011. 10.57 Confirmation of terms and conditions of ISDA Master Agreement, dated as of March 7, 2011, between Morgan Stanley Capital Services Inc. andBioCryst Pharmaceuticals, Inc. dated as of March 9, 2011. Incorporated by reference to Exhibit 10.3 of the Company’s Form 10-Q filed May 6, 2011. 10.58# Agreement, dated as of September 12, 2013, between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases.Incorporated by reference to Exhibit 10.2 of the Company’s Form 10-Q filed November 8, 2013. (Portions omitted pursuant to request for confidentialtreatment.) 10.59# Amendment #1 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedDecember 26, 2013. Incorporated by reference to Exhibit 10.51 to the Company’s Form 10-K filed on March 10, 2014. (Portions omitted pursuant torequest for confidential treatment.) 10.60# Amendment #2 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated January24, 2014. Incorporated by reference to Exhibit 10.52 to the Company’s Form 10-K filed on March 10, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.61# Amendment #3 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated June 17,2014. Incorporated by reference to Exhibit 10.5 to the Company’s Form 10-Q filed on August 8, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.62# Amendment #4 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated June 17,2014. Incorporated by reference to Exhibit 10.6 to the Company’s Form 10-Q filed on August 8, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.63# Amendment #5 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated August11, 2014. Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed on November 7, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.64# Amendment #6 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated August27, 2014. Incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q filed on November 7, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.65# Amendment #8 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedSeptember 17, 2014. Incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on November 7, 2014. (Portions omitted pursuant torequest for confidential treatment.) 81 10.66# Amendment #9 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated October29, 2014. Incorporated by reference to Exhibit 10.4 to the Company’s Form 10-Q filed on November 7, 2014. (Portions omitted pursuant to request forconfidential treatment.) 10.67# Amendment #10 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedFebruary 13, 2015. Incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q filed on August 7, 2015. (Portions omitted pursuant torequest for confidential treatment.) 10.68# Amendment #11 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated March19, 2015. Incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on August 7, 2015. (Portions omitted pursuant to request forconfidential treatment.) 10.69# Amendment #12 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated June 12,2015. Incorporated by reference to Exhibit 10.4 to the Company’s Form 10-Q filed on August 7, 2015. (Portions omitted pursuant to request forconfidential treatment.) 10.70# Amendment #13 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated June 17,2015. Incorporated by reference to Exhibit 10.5 to the Company’s Form 10-Q filed on August 7, 2015. (Portions omitted pursuant to request forconfidential treatment.) 10.71# Amendment #14 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedSeptember 16, 2015. Incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on November 6, 2015. (Portions omitted pursuant torequest for confidential treatment.) 10.72 Amendment #15 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedNovember 16, 2015. Incorporated by reference to Exhibit 10.70 to the Company’s Form 10-K filed on February 26, 2016. 10.73# Amendment #16 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, datedDecember 18, 2015. Incorporated by reference to Exhibit 10.71 to the Company’s Form 10-K filed on February 26, 2016. (Portions omitted pursuant torequest for confidential treatment.) (10.74) Amendment #17 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated April18, 2016. 10.75# Amendment #18 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated June 30,2016. Incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on August 8, 2016. (Portions omitted pursuant to request forconfidential treatment.) 10.76# Amendment #19 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated August10, 2016. Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed on November 8, 2016. (Portions omitted pursuant to request forconfidential treatment.) (10.77)† Amendment #20 to the Agreement between BioCryst Pharmaceuticals, Inc. and the National Institute of Allergy and Infectious Diseases, dated January9, 2017. (Portions omitted pursuant to request for confidential treatment.) 10.78# Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority within the U.S. Department ofHealth and Human Services' Office of the Assistant Secretary for Preparedness and Response, dated March 27, 2015. Incorporated by reference toExhibit 10.2 to the Company’s Form 10-Q filed on May 8, 2015. (Portions omitted pursuant to request for confidential treatment.) 10.79# Amendment #1 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated June 2,2015. Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed on August 7, 2015. (Portions omitted pursuant to request forconfidential treatment.) 10.80# Amendment #2 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated July 8, 2015. Incorporatedby reference to Exhibit 10.1 to the Company’s Form 10-Q filed on November 6, 2015. (Portions omitted pursuant to request for confidentialtreatment.) 82 10.81# Amendment #3 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated August 25, 2015. Incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q filed on November 6, 2015. (Portions omitted pursuant to request forconfidential treatment.) 10.82# Amendment #4 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated February 25, 2016.Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed on May 9, 2016. (Portions omitted pursuant to request for confidentialtreatment.) 10.83# Amendment #5 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated April 11, 2016.Incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed on August 8, 2016. (Portions omitted pursuant to request for confidentialtreatment.) 10.84# Amendment #6 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated May 20, 2016.Incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q filed on August 8, 2016. (Portions omitted pursuant to request for confidentialtreatment.) 10.85# Amendment #7 to the Agreement between BioCryst Pharmaceuticals, Inc. and the Biomedical Advanced Research and Development Authority withinthe U.S. Department of Health and Human Services’ Office of the Assistant Secretary for Preparedness and Response, dated September 26, 2016.Incorporated by reference to Exhibit 10.2 to the Company’s Form 10-Q filed on November 8, 2016. (Portions omitted pursuant to request forconfidential treatment.) 10.86# License Agreement by and between BioCryst Pharmaceuticals, Inc. and Seqirus UK Limited, dated as of June 16, 2015. Incorporated by reference toExhibit 10.8 to the Company’s Form 10-Q filed on May 8, 2015. (Portions omitted pursuant to request for confidential treatment.) 10.87# Credit and Security Agreement, dated as of September 23, 2016, by and among Midcap Financial Trust, as administrative agent, the Lenders listed onthe Credit Facility Schedule attached thereto and otherwise party thereto from time to time, BioCryst Pharmaceuticals, Inc., and MDCP, LLC.Incorporated by reference to Exhibit 10.3 to the Company’s Form 10-Q filed on November 8, 2016. (Portions omitted pursuant to request forconfidential treatment.) (21) Subsidiaries of the Registrant. (23) Consent of Ernst & Young, LLP, Independent Registered Public Accounting Firm. (31.1) Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (31.2) Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (32.1) Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (32.2) Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (101) Financial statements from the Annual Report on Form 10-K of BioCryst Pharmaceuticals, Inc. for the year ended December 31, 2016, formatted inXBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Comprehensive Loss, (iii) Consolidated Statements of Cash Flows, (iv)Consolidated Statements of Stockholders’ Equity and (v) Notes to Consolidated Financial Statements. † Confidential treatment requested.# Confidential treatment granted.& Management contracts.( ) Filed herewith. 83 Exhibit 10.74 Exhibit 10.77 Exhibit 21Subsidiaries of the Registrant Subsidiary Jurisdiction of Incorporation JPR Royalty Sub LLC Delaware MDCP, LLC Delaware Exhibit 23 Consent of Independent Registered Public Accounting Firm We consent to the incorporation by reference in the following Registration Statements: • Registration Statements (Form S-8 Nos. 333-120345, 333-39484 and 333-30751) pertaining to the BioCryst Pharmaceuticals, Inc. 1991 Stock OptionPlan, as amended and restated as of March 8, 2004; • Registration Statement (Form S-8 No. 333-90582) pertaining to the BioCryst Pharmaceuticals, Inc. Employee Stock Purchase Plan; • Registration Statement (Form S-8 No. 333-136703) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan, which amended andrestated the BioCryst Pharmaceuticals, Inc. 1991 Stock Option Plan as of May 17, 2006; • Registration Statement (Form S-3 No. 333-145638) pertaining to the registration of up to 8,140,000 shares of common stock; • Registration Statement (Form S-8 No. 333-145627) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan as amended and restatedeffective March 2007 and Employment Letter Agreement dated April 2, 2007 between BioCryst Pharmaceuticals, Inc. and David McCullough; • Registration Statement (Form S-3 No. 333-153084) for the registration of 3,335,408 shares of BioCryst Pharmaceuticals, Inc. common stock and3,159,895 warrants to purchase common stock of BioCryst Pharmaceuticals, Inc.; • Registration Statement (Form S-8 No. 333-152570) pertaining to the BioCryst Pharmaceutical, Inc. Stock Incentive Plan, as amended and restatedeffective February 28, 2008 and the BioCryst Pharmaceuticals, Inc. Employee Stock Purchase Plan, as amended and restated effective February 28,2008; • Registration Statement (Form S-8 No. 333-167830) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan, as amended and restatedeffective March 31, 2010 and the BioCryst Pharmaceuticals, Inc. Employee Stock Purchase Plan, as amended and restated effective March 31, 2010; • Registration Statement (Form S-8 No. 333-176096) pertaining to the BioCryst Pharmaceutical, Inc. Stock Incentive Plan, as amended and restatedeffective February 17, 2011; • Registration Statement (Form S-8 No. 333-187193) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan and Employee StockPurchase Plan, each as amended and restated effective March 29, 2012; • Registration Statement (Form S-8 No. 333-195869) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan and Employee StockPurchase Plan, each as amended and restated effective March 8, 2014; • Registration Statement (Form S-3 No. 333-202466) for the registration of up to $150 million of BioCryst Pharmaceuticals, Inc. common stock,preferred stock, depositary shares, stock purchase contracts, warrants or units; • Registration Statement (Form S-8 No. 333- 211529) pertaining to the BioCryst Pharmaceuticals, Inc. Stock Incentive Plan as amended and restatedeffective May 23, 2016. of our reports dated February 27, 2017 with respect to the consolidated financial statements of BioCryst Pharmaceuticals, Inc. and the effectiveness of internalcontrol over financial reporting of BioCryst Pharmaceuticals, Inc. included in this Annual Report (Form 10-K) of BioCryst Pharmaceuticals, Inc. for the year endedDecember 31, 2016. /s/ Ernst & Young LLP Raleigh, North Carolina February 27, 2017 Exhibit 31.1 CERTIFICATIONS I, Jon P. Stonehouse, certify that: 1. I have reviewed this annual report on Form 10-K of BioCryst Pharmaceuticals, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make thestatements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for theregistrant and have: a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensurethat material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared; b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision,to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordancewith generally accepted accounting principles; c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscalquarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and 5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions): a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likelyto adversely affect the registrant’s ability to record, process, summarize and report financial information; and b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control overfinancial reporting. /s/ Jon P. Stonehouse Jon P. Stonehouse Chief Executive Officer Date: February 27, 2017 Exhibit 31.2 CERTIFICATIONS I, Thomas R. Staab II, certify that: 1. I have reviewed this annual report on Form 10-K of BioCryst Pharmaceuticals, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make thestatements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for theregistrant and have: a. designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensurethat material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared; b. designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision,to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordancewith generally accepted accounting principles; c. evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and d. disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscalquarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and 5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions): a. all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likelyto adversely affect the registrant’s ability to record, process, summarize and report financial information; and b. any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control overfinancial reporting. /s/ Thomas R. Staab II Thomas R. Staab II Chief Financial Officer and Treasurer (Principal Financial Officer) Date: February 27, 2017 Exhibit 32.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of BioCryst Pharmaceuticals, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2016 as filedwith the Securities and Exchange Commission on the date hereof (the “Report”), I, Jon P. Stonehouse, Chief Executive Officer of the Company, certify, pursuantto 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge: (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. /s/ Jon P. Stonehouse Jon P. StonehouseChief Executive Officer February 27, 2017 This certification is furnished with this Report on Form 10-K pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extentrequired by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Suchcertification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to theextent that the Company specifically incorporates it by reference. Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of BioCryst Pharmaceuticals, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2016 as filedwith the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas R. Staab, II, Chief Financial Officer of the Company, certify, pursuantto 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge: (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. /s/ Thomas R. Staab II Thomas R. Staab II Chief Financial Officer and Treasurer (Principal Financial Officer) February 27, 2017 This certification is furnished with this Report on Form 10-K pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extentrequired by such Act, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Suchcertification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to theextent that the Company specifically incorporates it by reference.
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