EXHIBIT 11.01 PORTOLA PACKAGING, INC. AND SUBSIDIARIES COMPUTATION OF NET INCOME (LOSS) PER SHARE (1) (IN THOUSANDS, EXCEPT PER SHARE DATA) THREE MONTHS ENDED YEAR ENDED AUGUST 31, NOVEMBER 30, -------------------------------- --------------------- 1994 1995 1996 1995 1996 --------- --------- ---------- --------- ---------- Weighted average common shares outstanding for the period.... 11,087 11,393 11,800 12,077 11,813 --------- --------- ---------- --------- ---------- Shares used in per share calculation......................... 11,087 11,393 11,800 12,077 11,813 --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Income (loss) before extraordinary items and cumulative effect of change in accounting principle................... $ 1,100 $ 140 $ (8,177) $ 796 $ (926) Less the increase in the put value of warrants............... (455) (610) (895) (206) (256) --------- --------- ---------- --------- ---------- Income (loss) before extraordinary item...................... $ 645 $ (470) $ (9,072) $ 590 $ (1,182) --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Cumulative effect of change in accounting principle.......... $ 85 $ 1,265 --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Net income (loss)............................................ $ 225 $ 140 $ (9,442) $ (469) $ (926) Less the increase in the put value of warrants............... (455) (610) (895) (206) (256) --------- --------- ---------- --------- ---------- Net income (loss)............................................ $ (230) $ (470) $ (10,337) $ (675) $ (1,182) --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Net income (loss) per share before extraordinary item and cumulative effect of change in accounting principle........ $ 0.06 $ (0.04) $ (0.77) $ 0.05 $ (0.10) --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Cumulative effect of change in accounting priciple........... $ 0.01 $ (0.11) --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- Net income (loss) per share.................................. $ (0.02) $ (0.04) $ (0.88) $ (0.06) $ (0.10) --------- --------- ---------- --------- ---------- --------- --------- ---------- --------- ---------- (1) There is no difference between primary and fully diluted net income (loss) per share for all periods presented.