EXHIBIT 11.01 ADVANCED TECHNOLOGY MATERIALS, INC. COMPUTATION OF EARNINGS PER COMMON SHARE Quarter Ended Quarter Ended 6/30/97 6/30/96 ---------- ----------- Net income $ 1,339,594 $ 640,448 --------- ------- Average common shares outstanding 8,802,622 8,731,572 Incremental shares issuable pursuant to employee stock options and warrants (if dilutive) 815,016 681,490 ------- ------- Total shares 9,617,638 9,413,062 --------- --------- Net income per share $ 0.14 $ 0.07 ---- ---- Six Months Ended Six Months Ended 6/30/97 6/30/96 Net income $ 2,446,165 $1,109,894 --------- ---------- Average common shares outstanding 8,796,939 8,726,818 Incremental shares issuable pursuant to employee stock options and warrants (if dilutive) 786,589 637,484 ------- ------- Total shares 9,583,528 9,364,302 --------- --------- Net income per share $ 0.26 $ 0.12 ---- ----