IGEN International, Inc. Form 10-Q For the Quarter Ended September 30, 1998 EXHIBIT 11.1 Statement Re: Computation of Net Income Per Share (In thousands, except per share data) Three months ended Six months ended September 30, September 30, 1998 1997 1998 1997 -------- -------- -------- -------- Weighted average number of common shares outstanding 15,315 15,107 15,296 15,053 -------- -------- -------- -------- Net loss $ (3,415) $(2,286) $(6,320) $(5,957) Plus accrued Series B convertible preferred stock dividend (478) -- (972) -- -------- -------- -------- -------- Loss attributable to common shareholders $ (3,893) $(2,286) $(7,292) $(5,957) -------- -------- -------- -------- -------- -------- -------- -------- Loss per share - basic and diluted $ (0.25) $ (0.15) $ (0.48) $ (0.40) -------- -------- -------- -------- -------- -------- -------- -------- 18