EXHIBIT 11.01 PORTOLA PACKAGING, INC. AND SUBSIDIARIES COMPUTATION OF NET INCOME (LOSS) PER SHARE (1) (IN THOUSANDS, EXCEPT PER SHARE DATA) SIX MONTHS ENDED YEAR ENDED AUGUST 31, -------------------- -------------------------------- FEB. 29, FEB. 28, 1994 1995 1996 1996 1997 --------- --------- ---------- --------- --------- Weighted average common shares outstanding for the period... 11,087 11,393 11,800 11,585 11,806 --------- --------- ---------- --------- --------- Shares used in per share calculation........................ 11,087 11,393 11,800 11,585 11,806 --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Income (loss) before extraordinary items and cumulative effect of change in accounting principle.................. $ 1,100 $ 140 $ (8,177) $ (200) $ (5,235) Less the increase in the put value of warrants.............. (455) (610) (895) (423) (526) --------- --------- ---------- --------- --------- Income (loss) before extraordinary item..................... $ 645 $ (470) $ (9,072) $ (623) $ (5,761) --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Cumulative effect of change in accounting principle......... $ 85 --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Net income (loss)........................................... $ 225 $ 140 $ (9,442) $ (1,465) $ (5,235) Less the increase in the put value of warrants.............. (455) (610) (895) (423) (526) --------- --------- ---------- --------- --------- Net income (loss)........................................... $ (230) $ (470) $ (10,337) $ (1,888) $ (5,761) --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Net income (loss) per share before extraordinary item and cumulative effect of change in accounting principle....... $ 0.06 $ (0.04) $ (0.77) $ (0.05) $ (0.49) --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Cumulative effect of change in accounting priciple.......... $ 0.01 --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- Net income (loss) per share................................. $ (0.02) $ (0.04) $ (0.88) $ (0.16) $ (0.49) --------- --------- ---------- --------- --------- --------- --------- ---------- --------- --------- (1) There is no difference between primary and fully diluted net income (loss) per share for all periods presented.