EXHIBIT 11.01 PORTOLA PACKAGING, INC. COMPUTATION OF NET INCOME (LOSS) PER SHARE (1) (IN THOUSANDS, EXCEPT PER SHARE DATA) Year Ended August 31, 1994 1995 1996 --------- --------- --------- Weighted average common shares outstanding for the period 11,087 11,393 11,800 --------- --------- --------- Shares used in per share calculation 11,087 11,393 11,800 --------- --------- --------- --------- --------- --------- Income (loss)before extraordinary items and cumulative effect of change in accounting principle $1,100 $140 ($8,177) Less the increase in the put value of warrants (455) (610) (895) --------- --------- --------- Income (loss) before extraordinary item $645 ($470) ($9,072) --------- --------- --------- --------- --------- --------- Cumulative effect of change in accounting principle $85 --------- --------- Net income (loss) $225 $140 ($9,442) Less the increase in the put value of warrants (455) (610) (895) --------- --------- --------- Net income (loss) ($230) ($470) ($10,337) --------- --------- --------- --------- --------- --------- Net income (loss) per share before extraordinary item and cumulative effect of change in accounting principle $0.06 ($0.04) ($0.77) --------- --------- --------- --------- --------- --------- Cumulative effect of change in accounting principle $0.01 Net income (loss) per share --------- --------- ($0.02) ($0.04) ($0.88) --------- --------- --------- --------- --------- --------- (1) There is no difference between primary and fully diluted net income (loss) per share for all periods presented.