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Insider Trading Arrangements
 3 Months Ended 12 Months Ended
Jan. 03, 2025
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Jan. 03, 2025
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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 29, 2024. Mr. Wyszomierski’s trading plan provides for the sale of up to 23,409 shares of our common stock (including shares obtained from the exercise of vested stock options covered by the trading plan) between February 28, 2025 and June 13, 2025. 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.
S. Gail Eckhardt, a member of our Board of Directors, entered into a pre-arranged stock trading plan on October 30, 2024. Ms. Eckhardt’s trading plan provides for the sale of up to 30,406 shares of our common stock (including shares obtained from the exercise of vested stock options covered by the trading plan) between February 14, 2025 and September 30, 2025. 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.
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    
Name Jack L Wyszomierski  
Title Board of Directors  
Rule 10b5-1 Arrangement Adopted true  
Adoption Date November 29, 2024  
Expiration Date June 13, 2025  
Arrangement Duration 105 days  
Aggregate Available 23,409 23,409
S Gail Eckhardt [Member]    
Trading Arrangements, by Individual    
Name S. Gail Eckhardt  
Title Board of Directors  
Rule 10b5-1 Arrangement Adopted true  
Adoption Date October 30, 2024  
Expiration Date September 30, 2025  
Arrangement Duration 228 days  
Aggregate Available 30,406 30,406