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b Berkley W. R. Berkley Corporation Reports First Quarter Results 4/20/2021 First Quarter Gross Premiums Written Grew 11.4 % and Return on Equity of 14.5 % GREENWICH , Conn .-- ( BUSINESS WIRE ) -- W. R. Berkley Corporation ( NYSE : WRB ) today reported its first quarter 2021 results . Summary Financial Data ( Amounts in thousands , except per share data ) First Quarter 2021 2020 Gross premiums written Net premiums written Net income ( loss ) to common stockholders Net income ( loss ) per diluted share $ 2,484,712 2,050,038 229,525 1.23 $ 2,231,372 1,845,846 ( 4,418 ) ( 0.02 ) Operating income ( 1 ) Operating income per diluted share 201,780 1.08 132,623 0.69 Return on equity ( 2 ) 14.5 % ( 0.3 ) % ( 1 ) Operating income is a non - GAAP financial measure defined by the Company as net income excluding after - tax net investment gains ( losses ) and related expenses . ( 2 ) Return on equity represents net income ( loss ) expressed on an annualized basis as a percentage of beginning of year common stockholders ' equity . First quarter highlights included : 1