SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of Gilead Sciences, Inc. (Gilead, we or us) believes are necessary for a fair presentation of the periods presented. These interim financial results are not necessarily indicative of results expected for the full fiscal year or for any subsequent interim period.

The preparation of these Condensed Consolidated Financial Statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an ongoing basis, we evaluate our estimates, including critical accounting policies or estimates related to revenue recognition, intangible assets, allowance for doubtful accounts, prepaid royalties, clinical trial accruals, our tax provision and stock-based compensation. We base our estimates on historical experience and on various other market specific and other relevant assumptions that we believe 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.

The accompanying Condensed Consolidated Financial Statements include the accounts of Gilead, our wholly-owned subsidiaries and our joint ventures with Bristol-Myers Squibb Company (BMS), for which we are the primary beneficiary. We record a noncontrolling interest in our Condensed Consolidated Financial Statements to reflect BMS’s interest in the joint ventures. All intercompany transactions have been eliminated. The Condensed Consolidated Financial Statements include the results of companies acquired by us from the date of each acquisition for the applicable reporting periods.

The accompanying Condensed Consolidated Financial Statements and related financial information should be read in conjunction with the audited Consolidated Financial Statements and the related notes thereto for the year ended December 31, 2011, included in our Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission (SEC). Certain amounts within our Condensed Consolidated Balance Sheets have been reclassified to conform to the current presentation.

Net Income Per Share Attributable to Gilead Common Stockholders

Basic net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding during the period. Diluted net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding and other dilutive securities outstanding during the period. The potential dilutive shares of our common stock resulting from the assumed exercise of outstanding stock options, performance shares and the assumed exercise of warrants relating to the convertible senior notes due in May 2013 (May 2013 Notes), May 2014 (May 2014 Notes) and May 2016 (May 2016 Notes) (collectively, the Convertible Notes) are determined under the treasury stock method.

Because the principal amount of the Convertible Notes will be settled in cash, only the conversion spread relating to the Convertible Notes is included in our calculation of diluted net income per share attributable to Gilead common stockholders. Our common stock resulting from the assumed settlement of the conversion spread of the Convertible Notes has a dilutive effect when the average market price of our common stock during the period exceeds the conversion prices of $38.10, $45.08 and $45.41 for the May 2013 Notes, May 2014 Notes and May 2016 Notes, respectively.

In 2011, our convertible senior notes due in May 2011 (May 2011 Notes) matured and the related warrants expired and as a result, we have only considered their impact for the period they were outstanding on our net income per share calculations. Our common stock resulting from the assumed settlement of the conversion spread of the May 2011 Notes had a dilutive effect when the average market price of our common stock during the period exceeded the conversion price of $38.75. During the three months ended March 31, 2011, the average market price of our common stock exceeded the conversion price of the May 2011 Notes and the dilutive effect is included in the accompanying table. Warrants related to the May 2011 Notes had a dilutive effect when the average market price of our common stock during the period exceeded the warrants’ exercise price of $50.80. The average market price of our common stock during the three months ended March 31, 2011 did not exceed the warrants’ exercise price related to the May 2011 Notes; therefore, these warrants did not have a dilutive effect on our net income per share for that period.

During the three months ended March 31, 2012, the average market price of our common stock exceeded the conversion prices of the May 2013 Notes, May 2014 Notes and May 2016 Notes and the dilutive effects are included in the accompanying table. During the three months ended March 31, 2011, the average market price of our common stock exceeded the conversion price of the May 2013 Notes and the dilutive effect is included in the accompanying table. During the three months ended March 31, 2011, the average market price of our common stock did not exceed the conversion prices of the May 2014 Notes and May 2016 Notes and therefore, these notes did not have a dilutive effect on our net income per share for that period.

Warrants relating to the May 2013 Notes, May 2014 Notes and May 2016 Notes have a dilutive effect when the average market price of our common stock during the period exceeds the warrants’ exercise prices of $53.90, $56.76 and $60.10, respectively. The average market prices of our common stock during each of the three months ended March 31, 2012 and 2011 did not exceed the warrants’ exercise prices relating to any of the Convertible Notes; therefore, these warrants did not have a dilutive effect on our net income per share for those periods.

Stock options to purchase approximately 10.9 million and 22.1 million weighted-average shares of our common stock were outstanding during the three months ended March 31, 2012 and 2011, respectively, but were not included in the computation of diluted net income per share attributable to Gilead common stockholders because their effect was antidilutive.

The following table is a reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share attributable to Gilead common stockholders (in thousands):



	Three Months Ended
	March 31,
	2012		2011
Numerator:
Net income attributable to Gilead	$	441,956	$	651,141
Denominator:
Weighted-average shares of common stock outstanding used in the calculation of basic net income per share attributable to Gilead common stockholders	756,286		796,115
Effect of dilutive securities:
Stock options and equivalents	14,873		15,007
Conversion spread related to the May 2011 Notes	—		224
Conversion spread related to the May 2013 Notes	3,423		511
Conversion spread related to the May 2014 Notes	1,505		—
Conversion spread related to the May 2016 Notes	1,301		—
Weighted-average shares of common stock outstanding used in the calculation of diluted net income per share attributable to Gilead common stockholders	777,388		811,857

Concentrations of Risk

We are subject to credit risk from our portfolio of cash equivalents and marketable securities. Under our investment policy, we limit amounts invested in such securities by credit rating, maturity, industry group, investment type and issuer, except for securities issued by the U.S. government. We are not exposed to any significant concentrations of credit risk from these financial instruments. The goals of our investment policy, in order of priority, are as follows: safety and preservation of principal and diversification of risk; liquidity of investments sufficient to meet cash flow requirements; and a competitive after-tax rate of return.

We are also subject to credit risk from our accounts receivable related to our product sales. The majority of our trade accounts receivable arises from product sales in the United States and Europe. As of March 31, 2012, our accounts receivable in Southern Europe, specifically Greece, Italy, Portugal and Spain, totaled approximately $1.25 billion, of which $719.5 million were greater than 120 days past due and $313.3 million were greater than 365 days past due. To date, we have not experienced significant losses with respect to the collection of our accounts receivable. We believe that our allowance for doubtful accounts was adequate at March 31, 2012.

Recent Accounting Pronouncements

There have been no new accounting pronouncements during the three months ended March 31, 2012 that are of significance to us.