1 EXHIBIT 11 NANOPHASE TECHNOLOGIES CORPORATION STATEMENT REGARDING COMPUTATION OF LOSS PER SHARE (UNAUDITED) THREE MONTHS ENDED MARCH 31, ---------------------------------------- 1999 1998 ------------------- ------------------ HISTORICAL: Weighted average common shares outstanding 12,593,718 12,277,467 =================== ================== Net loss $ (1,575,902) $ (887,400) =================== ================== Net loss per common share $ (0.13) $ (0.07) =================== ==================