EXHIBIT 11 BOSTON BIOMEDICA, INC. AND SUBSIDIARIES STATEMENT RE COMPUTATION OF INCOME PER SHARE WEIGHTED AVERAGE SHARES
Quarter Ended June 30, Six Months Ended June 30, ----------------------- ------------------------- 1997 1996 1997 1996 --------- --------- ---------- ---------- Average common stock outstanding 4,395,918 2,636,309 4,388,045 2,625,241 Net effect of dilutive common stock equivalents-based on treasury stock method using average market price 455,705 623,044 443,702 623,044 Issuance of "cheap stock" - 4,358 - 4,358 --------- --------- --------- --------- 4,851,623 3,263,711 4,831,747 3,252,643 ========= ========= ========= ========= Net income $175,690 $179,407 $323,448 $82,869 ========= ========= ========= ========= Net income per share 0.04 0.06 0.07 0.03 ========= ========= ========= =========