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Insider Trading Arrangements
 3 Months Ended
Jan. 02, 2026
shares
Trading Arrangements, by Individual  
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
Jack L Wyszomierski [Member]  
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement
Jack L. Wyszomierski, a member of our Board of Directors, entered into a pre-arranged stock trading plan on November 19, 2025. Mr. Wyszomierski’s trading plan provides for the sale of up to 114,746 shares of our common stock (including shares obtained from the exercise of vested stock options covered by the trading plan) between February 18, 2026 and November 19, 2026. This trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and Exelixis’ policies regarding transactions in Exelixis securities.
Name Jack L. Wyszomierski
Title member of our Board of Directors
Rule 10b5-1 Arrangement Adopted true
Adoption Date November 19, 2025
Expiration Date November 19, 2026
Arrangement Duration 274 days
Aggregate Available 114,746
S Gail Eckhardt [Member]  
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement
S. Gail Eckhardt, a member of our Board of Directors, entered into a pre-arranged stock trading plan on November 11, 2025. Dr. Eckhardt’s trading plan provides for the sale of up to 13,668 shares of our common stock between February 13, 2026 and June 30, 2026. This trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and Exelixis’ policies regarding transactions in Exelixis securities.
Name S. Gail Eckhardt
Title member of our Board of Directors
Rule 10b5-1 Arrangement Adopted true
Adoption Date November 11, 2025
Expiration Date June 30, 2026
Arrangement Duration 137 days
Aggregate Available 13,668
Brenda J. Hefti [Member]  
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement Brenda J. Hefti, our Senior Vice President and General Counsel, an officer for purposes of Section 16 of the Exchange Act, modified an existing 10b5-1 trading plan that was originally entered on February 26, 2025. Dr. Hefti’s modified trading plan provides for the sale of up to 30,202 shares of our common stock between February 18, 2026 and May 29, 2026. This modified trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and Exelixis’ policies regarding transactions in Exelixis securities.
Name Brenda J. Hefti
Title Senior Vice President and General Counsel
Rule 10b5-1 Arrangement Adopted true
Adoption Date November 19, 2025
Expiration Date May 29, 2026
Arrangement Duration 100 days
Aggregate Available 30,202