Quarterly report pursuant to Section 13 or 15(d)

STATEMENTS OF STOCKHOLDERS' EQUITY

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STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Balance at Dec. 31, 2017 $ 147 $ 1,239,435 $ (82) $ (1,138,854) $ 100,646
Balance (in shares) at Dec. 31, 2017 146,814,906        
Increase (Decrease) in Stockholders' Equity          
Net loss       (24,385) (24,385)
Net change in unrealized gain or loss on short-term investments     (5)   (5)
Issuance of common stock upon exercise of options and participation in Purchase Plan $ 1 2,010     2,011
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 652,891        
Stock compensation expense   1,540     1,540
Balance at Mar. 31, 2018 $ 148 1,242,985 (87) (1,163,239) 79,807
Balance (in shares) at Mar. 31, 2018 147,467,797        
Balance at Dec. 31, 2018 $ 167 1,319,068 (24) (1,209,334) 109,877 [1]
Balance (in shares) at Dec. 31, 2018 167,171,505        
Increase (Decrease) in Stockholders' Equity          
Net loss       (17,598) (17,598)
Net change in unrealized gain or loss on short-term investments     34   34
Issuance of common stock upon exercise of options and participation in Purchase Plan   16     16
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 7,583        
Stock compensation expense   2,986     2,986
Balance at Mar. 31, 2019 $ 167 $ 1,322,070 $ 10 $ (1,226,932) $ 95,315
Balance (in shares) at Mar. 31, 2019 167,179,088        
[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2018.