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Stockholders’ Equity
 9 Months Ended
Oct. 03, 2025
Share-Based Payment Arrangement [Abstract]  
STOCKHOLDERS’ EQUITY STOCKHOLDERS’ EQUITY
Stock-based Compensation
We have an equity incentive plan under which we grant stock options and restricted stock units (RSUs), including market condition-based RSUs and performance-based RSUs (PSUs) to employees and directors. As of September 30, 2025, 11.3 million shares were available for grant under the Exelixis, Inc. 2017 Equity Incentive Plan (as amended and restated, the 2017 Plan). The share reserve is reduced by 1 share for each share issued pursuant to a stock option and 2 shares for full value awards, including RSUs and PSUs.
We allocated the stock-based compensation for our 2017 Plan and our 2000 Employee Stock Purchase Plan (as amended and restated, the Amended ESPP) as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Research and development$10,353 $8,764 $34,018 $21,834 
Selling, general and administrative20,532 14,259 58,868 45,656 
Total stock-based compensation$30,885 $23,023 $92,886 $67,490 
Stock-based compensation for each type of award under our 2017 Plan and Amended ESPP were as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Stock options$493 $1,397 $2,224 $4,659 
Restricted stock units29,660 20,626 87,388 58,224 
Performance stock units— 370 241 2,194 
Employee stock purchase plan
732 630 3,033 2,413 
Total stock-based compensation$30,885 $23,023 $92,886 $67,490 
As of September 30, 2025, there were 2.6 million stock options outstanding and $1.2 million of related unrecognized stock-based compensation.
In February 2025, we awarded to certain employees an aggregate of 1.0 million RSUs (the target number) that are subject to a total shareholder return (TSR) market condition and a time-based service condition (the 2025 TSR-based RSUs). The TSR market condition is based on our relative TSR percentile rank compared to companies in the Nasdaq Biotechnology Index during the performance period, which is January 4, 2025 through December 31, 2027. Depending on the results relative to the TSR market condition, the holders of the 2025 TSR-based RSUs may earn up to 175% of the target number of shares. Following achievement of the market condition at the end of the performance period and upon employee’s continuous service through the vesting dates, 50% of the shares earned pursuant to the 2025 TSR-based RSUs will vest shortly after the end of the performance period, and the remainder will vest approximately one year later. The 2025 TSR-based RSUs will be forfeited if the market condition at or above a threshold level is not achieved, and/or the time-based service condition is not fulfilled, by the end of the performance period and through the vesting dates.
In March 2025 and September 2025, we awarded to employees an aggregate of 7.2 million RSUs that are subject to a stock price appreciation market condition and a time-based service condition (the 2025 stock price target-based RSUs). The market condition will be satisfied to the extent that the volume-weighted average closing price of our common stock for any consecutive 90-calendar-day period equals or exceeds $60 per share on any day during the performance period, which is March 31, 2025 through March 31, 2030. Following achievement of the market condition, the 2025 stock price target-based RSUs will vest upon employee’s continuous service through the end of the performance period on March 31, 2030 (the time-based service condition). The 2025 stock price target-based RSUs will be forfeited if the market condition at or above the target price is not achieved, and/or the time-based service condition is not fulfilled, by the end of the performance period.
We used a Monte Carlo simulation model and the following weighted-average assumptions to determine the weighted average grant date fair value of $47.58 per share for the 2025 TSR-based RSUs and $25.26 per share for the 2025 stock price target-based RSUs:
2025 TSR-based RSUs2025 stock price target-based RSUs
Fair value of Exelixis common stock on grant date
$37.53 $37.09 
Expected volatility
32.6%38.3%
Risk-free interest rate
4.0%3.9%
Dividend yield
—%—%
The Monte Carlo simulation model for our 2025 TSR-based RSUs assumed correlations of returns of the stock prices of Exelixis common stock and the common stock of a peer group of companies and historical stock price volatility of the peer group of companies. The valuation model also used terms based on the remaining length of the performance period and compound annual growth rate goals for TSR based on the provisions of the awards. The Monte Carlo simulation model for our 2025 stock price target-based RSUs assumed historical stock price volatility and compounded risk-free rate over the remaining length of the performance period. Stock-based compensation related to RSUs with a market condition is recognized regardless of the outcome of the market condition.
During the nine months ended September 30, 2025, we granted 2.6 million service-based RSUs with a weighted- average grant date fair value of $37.40 per share. As of September 30, 2025, there were 19.6 million RSUs outstanding, including RSUs that are subject to market conditions, and $365.6 million of related unrecognized stock-based compensation. Service-based RSUs granted to employees during the nine months ended September 30, 2025, have vesting conditions and contractual lives of a similar nature to those described in “Note 9. Stockholders’ Equity” of the “Notes to Consolidated Financial Statements” included in Part II, Item 8 of our Fiscal 2024 Form 10-K.
Common Stock Repurchases
In August 2024, our Board of Directors authorized a stock repurchase program to acquire up to $500.0 million of our outstanding common stock before December 31, 2025. In February 2025, our Board of Directors authorized the repurchase of up to an additional $500.0 million of our outstanding common stock before December 31, 2025. Under these programs, as of September 30, 2025, we repurchased 24.1 million shares of common stock for an aggregate purchase price of $895.3 million. As of September 30, 2025, approximately $104.7 million remained available for future stock repurchases before December 31, 2025.
Stock repurchases under these programs may be made from time to time through a variety of methods, which may include open market purchases, in block trades, Rule 10b5-1 trading plans, accelerated share repurchase transactions, exchange transactions, or any combination of such methods. The timing and amount of any stock repurchases under the stock repurchase programs will be based on a variety of factors, including ongoing assessments of the capital needs of the business, alternative investment opportunities, the market price of our common stock and general market conditions. These programs do not obligate us to acquire any amount of our common stock, and the stock repurchase programs may be modified, suspended or discontinued at any time without prior notice.