Quarterly report [Sections 13 or 15(d)]

CONDENSED STATEMENTS OF STOCKHOLDERS??? EQUITY

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CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2024   17,710,216      
Beginning balance at Dec. 31, 2024 $ 3,288 $ 18 $ 1,393,325 $ 10 $ (1,390,065)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 11,446       11,446
Net change in unrealized loss on short-term investments (12)     (12)  
Issuance of common stock upon exercise of options (in shares)   30,892      
Issuance of common stock upon exercise of options, net of shares withheld 484   484    
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares)   125,783      
Stock-based compensation expense 3,361   3,361    
Ending balance (in shares) at Mar. 31, 2025   17,866,891      
Ending balance at Mar. 31, 2025 18,567 $ 18 1,397,170 (2) (1,378,619)
Beginning balance (in shares) at Dec. 31, 2025   18,310,934      
Beginning balance at Dec. 31, 2025 391,480 [1] $ 18 1,414,322 181 (1,023,041)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 8,654       8,654
Net change in unrealized loss on short-term investments (309)     (309)  
Issuance of common stock upon exercise of options (in shares)   50,157      
Issuance of common stock upon exercise of options, net of shares withheld $ 321   321    
Issuance of common stock upon vesting of restricted stock units (RSUs) (in shares)   226,221      
Shares withheld (in shares) (105,728) (105,728)      
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation $ (3,740)   (3,740)    
Stock-based compensation expense 3,491   3,491    
Ending balance (in shares) at Mar. 31, 2026   18,481,584      
Ending balance at Mar. 31, 2026 $ 399,897 $ 18 $ 1,414,394 $ (128) $ (1,014,387)
[1] The balance sheet as of December 31, 2025 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the Securities and Exchange Commission (SEC) on March 3, 2026.