Gilead Sciences Announces Second Quarter 2013 Financial Results

Gilead Sciences, Inc. (Nasdaq: GILD) announced today its results of operations for the quarter ended June 30, 2013. Total revenues for the second quarter of 2013 increased 15 percent to $2.77 billion, from $2.41 billion for the second quarter of 2012. Product sales increased 14 percent to $2.66 billion for the second quarter of 2013 compared to $2.32 billion for the second quarter of 2012. Net income for the second quarter of 2013 was $772.6 million, or $0.46 per diluted share compared to $711.6 million, or $0.46 per diluted share for the second quarter of 2012. Non-GAAP net income for the second quarter of 2013, which excludes acquisition-related, restructuring and stock-based compensation expenses, was $839.7 million, or $0.50 per diluted share compared to $767.3 million, or $0.49 per diluted share for the second quarter of 2012.

Product Sales

Product sales were driven primarily by growth in Gilead´s antiviral franchise during the second quarter of 2013. Contributing to the increase were sales of Complera®/Eviplera® (emtricitabine 200 mg/rilpivirine 25 mg/tenofovir disoproxil fumarate 300 mg) and the launch of Stribild® (elvitegravir 150 mg/cobicistat 150 mg/emtricitabine 200 mg/tenofovir disoproxil fumarate 300 mg) in the third quarter of 2012. Product sales for the second quarter increased 20 percent in the U.S. and 4 percent in Europe compared to the second quarter of 2012.

Antiviral Product Sales

Antiviral product sales increased 15 percent to $2.31 billion for the second quarter of 2013, up from $2.01 billion for the second quarter of 2012, reflecting sales growth of 20 percent in the U.S. and 5 percent in Europe. The increase reflects strong underlying demand for our new single tablet regimen products, specifically Complera/Eviplera and Stribild.

Cardiovascular Product Sales

Cardiovascular product sales increased 19 percent to $234.9 million for the second quarter of 2013.

Operating Expenses and Other

Non-GAAP research and development (R&D) expenses increased due to Gilead´s continued investment in its product pipeline, particularly in liver disease and oncology. Non-GAAP selling, general and administrative (SG&A) expenses increased primarily due to the ongoing growth and expansion of Gilead´s business.

Interest expense decreased primarily due to the repayment of the convertible senior notes due in May 2013 and bank debt issued in connection with the acquisition of Pharmasset Inc. Gilead repaid debt totaling $929.6 million in the first half of 2013 and $700.0 million in the same period of 2012.

(1) Non-GAAP R&D expenses and SG&A expenses exclude the impact of acquisition-related, restructuring and stock-based compensation expenses where applicable.

Net Foreign Currency Exchange Impact

The net foreign currency exchange impact on second quarter 2013 product sales and pre-tax earnings was unfavorable $21.0 million and $13.2 million, respectively, compared to the second quarter of 2012.

Cash, Cash Equivalents and Marketable Securities

As of June 30, 2013, Gilead had $2.98 billion of cash, cash equivalents and marketable securities compared to $2.58 billion as of December 31, 2012. During the first half of 2013, Gilead generated $1.63 billion in operating cash flow.

Product & Pipeline Updates Announced by Gilead During the Second Quarter of 2013 Include:

Antiviral Program

April:

• Submission of a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for marketing approval to support the use of sofosbuvir and ribavirin (RBV) as an all-oral therapy for patients with genotype 2 and 3 chronic hepatitis C infection (HCV), and for sofosbuvir in combination with RBV and pegylated interferon (peg-IFN) for treatment-naïve patients with genotype 1, 4, 5 and 6 HCV infection. The FDA granted priority review for this filing in June and set a target review date of December 8, 2013 under the Prescription Drug User Fee Act.
• Detailed results from four Phase 3 studies (NEUTRINO, FISSION, POSITRON and FUSION) evaluating sofosbuvir were presented at the annual meeting of the European Association for the Study of the Liver. The sofosbuvir NDA is supported primarily by data from these four Phase 3 studies. Sofosbuvir was administered to nearly 1,000 patients with HCV as part of an all-oral 12-week or 16-week treatment regimen in combination with RBV in genotypes 2 and 3, or with RBV and peg-IFN for 12 weeks in genotypes 1, 4, 5 and 6.

May:

• Interim results from the Phase 2 LONESTAR study, which evaluated eight and 12-week courses of therapy with the once-daily fixed-dose combination of sofosbuvir/ledipasvir with and without RBV in treatment-naïve, non-cirrhotic patients. In this study, 19/19 patients in the 12-week arm had a sustained virologic response four weeks after completing therapy (SVR4) and 40/41 patients in the eight-week arms had a sustained virologic response eight weeks after stopping therapy (SVR8), with one relapse occurring in the arm receiving sofosbuvir/ledipasvir without RBV. Two additional cohorts in the LONESTAR study evaluated a 12-week course of the fixed-dose combination of sofosbuvir/ledipasvir with or without RBV in patients who had previously failed therapy with an HCV-specific protease inhibitor-based regimen. Half of the treatment-experienced patients had documented, compensated cirrhosis. Ninety-five percent of patients in each arm achieved SVR4, one cirrhotic patient in the sofosbuvir/ledipasvir arm relapsed and one patient in the sofosbuvir/ledipasvir plus RBV arm was lost to follow-up.
• Plans to initiate a third Phase 3 study (ION-3) of sofosbuvir/ledipasvir for the treatment of HCV, evaluating the once-daily fixed-dose combination of sofosbuvir/ledipasvir for eight weeks with and without RBV and for 12 weeks without RBV in 600 non-cirrhotic, treatment-naïve genotype 1 HCV patients.
• Submission of a Marketing Authorisation Application for sofosbuvir to the European Medicines Agency on April 17, 2013, which was fully validated and is under assessment.
• Granting of marketing authorization by the European Commission for Stribild, a single tablet regimen for the treatment of HIV-1 infection in adults who are antiretroviral treatment-naïve or are infected with HIV-1 without known mutations associated with resistance to any of the three antiretroviral agents in Stribild. This approval allows for the marketing of Stribild in all 27 countries of the European Union.

Oncology Program

May:

• Results from a Phase 2 study (Study 101-08) evaluating idelalisib (formerly GS-1101) in combination with rituximab for older patients with treatment-naïve chronic lymphocytic leukemia. This regimen achieved a complete response rate of 19 percent and an overall response rate of 97 percent, with estimated progression-free survival at 24 months of 93 percent. These results were presented at the American Society of Clinical Oncology Annual Meeting.

June:

• Interim results from a single-arm, open-label Phase 2 study (Study 101-09) evaluating idelalisib for the treatment of patients with indolent non-Hodgkin´s lymphoma that is refractory (non-responsive) to rituximab and to alkylating-agent-containing chemotherapy. Single-agent treatment with idelalisib achieved an overall response rate of 53.6 percent, with a median duration of response at this interim analysis of 11.9 months. Detailed study results were presented at the International Conference on Malignant Lymphoma.

Conference Call

At 4:30 p.m. Eastern Time today, Gilead´s management will host a conference call and a simultaneous webcast to discuss results from its second quarter 2013 as well as provide a general business update. To access the webcast live via the internet, please connect to the company´s website at www.gilead.com 15 minutes prior to the conference call to ensure adequate time for any software download that may be needed to hear the webcast. Alternatively, please call 1-866-730-5771 (U.S.) or 1-857-350-1595 (international) and dial the participant passcode 26371472 to access the call.

A replay of the webcast will be archived on the company´s website for one year, and a phone replay will be available approximately two hours following the call through July 28, 2013. To access the phone replay, please call 1-888-286-8010 (U.S.) or 1-617-801-6888 (international) and dial the participant passcode 87549354.

About Gilead

Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes innovative therapeutics in areas of unmet medical need. The company´s mission is to advance the care of patients suffering from life-threatening diseases worldwide. Headquartered in Foster City, California, Gilead has operations in North America, Europe and Asia-Pacific.

Non-GAAP Financial Information

Gilead has presented certain financial information in accordance with U.S. generally accepted accounting principles (GAAP) and also on a non-GAAP basis. Management believes this non-GAAP information is useful for investors, when considered in conjunction with Gilead´s GAAP financial statements, because management uses such information internally for its operating, budgeting and financial planning purposes. Non-GAAP information is not prepared under a comprehensive set of accounting rules and should only be used to supplement an understanding of Gilead´s operating results as reported under GAAP. A reconciliation between GAAP and non-GAAP financial information is provided in the table on pages 7 and 8.

Forward-looking Statements

Statements included in this press release that are not historical in nature are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Gilead cautions readers that forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially. These risks and uncertainties include: Gilead´s ability to achieve its anticipated full year 2013 financial results; Gilead´s ability to sustain growth in revenues for its antiviral, cardiovascular and respiratory programs; availability of funding for state AIDS Drug Assistance Programs (ADAPs); continued fluctuations in ADAP purchases driven by federal and state grant cycles which may not mirror patient demand and may cause fluctuations in Gilead´s earnings; the possibility of unfavorable results from clinical trials involving sofosbuvir, the fixed-dose combination of sofosbuvir/ledipasvir and idelalisib; the levels of inventory held by wholesalers and retailers which may cause fluctuations in Gilead´s earnings; Gilead´s ability to submit NDAs for new product candidates in the timelines currently anticipated, including the fixed-dose combination of sofosbuvir/ledipasvir for the treatment of HCV; Gilead´s ability to receive regulatory approvals in a timely manner or at all, for new and current products, including sofosbuvir for the treatment of HCV; Gilead´s ability to successfully commercialize its products, including Stribild; Gilead´s ability to successfully develop its respiratory, cardiovascular and oncology/inflammation programs; safety and efficacy data from clinical studies may not warrant further development of Gilead´s product candidates, including sofosbuvir, the fixed-dose combination of sofosbuvir/ledipasvir and idelalisib; the potential for additional austerity measures in European countries that may increase the amount of discount required on Gilead´s products; fluctuations in the foreign exchange rate of the U.S. dollar that may cause an unfavorable foreign currency exchange impact on Gilead´s future revenues and pre-tax earnings; and other risks identified from time to time in Gilead´s reports filed with the U.S. Securities and Exchange Commission (SEC). In addition, Gilead makes estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and related disclosures. Gilead bases its estimates on historical experience and on various other market-specific and other relevant assumptions that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ significantly from these estimates. You are urged to consider statements that include the words may, will, would, could, should, might, believes, estimates, projects, potential, expects, plans, anticipates, intends, continues, forecast, designed, goal, or the negative of those words or other comparable words to be uncertain and forward-looking. Gilead directs readers to its press releases, Quarterly Report on Form 10-Q for the quarter ended March 31, 2013 and other subsequent disclosure documents filed with the SEC. Gilead claims the protection of the Safe Harbor contained in the Private Securities Litigation Reform Act of 1995 for forward-looking statements. All forward-looking statements are based on information currently available to Gilead, and Gilead assumes no obligation to update any such forward-looking statements.

Gilead owns or has rights to various trademarks, copyrights and trade names used in our business, including the following: GILEAD®, GILEAD SCIENCES®, TRUVADA®, VIREAD®, HEPSERA®, AMBISOME®, EMTRIVA®, COMPLERA®, EVIPLERA®, STRIBILD®, VISTIDE®, LETAIRIS®, RANEXA® and CAYSTON®.

ATRIPLA® is a registered trademark belonging to Bristol-Myers Squibb & Gilead Sciences, LLC.

For more information on Gilead Sciences, Inc., please visit www.gilead.com or call the Gilead Public Affairs Department at 1-800-GILEAD-5 (1-800-445-3235).

GILEAD SCIENCES, INC.

CONSOLIDATED STATEMENTS OF INCOME

(unaudited)

(in thousands, except per share amounts)

GILEAD SCIENCES, INC.

RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL INFORMATION

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(in thousands, except percentages and per share amounts)