X0303 4 2009-12-16 0 0000709804 ADAPTEC INC ADPT 0001337747 Lowe Marcus D 691 SOUTH MILPITAS BLVD. MILPITAS CA 95035 0 1 0 0 VP, Marketing & Business Dev. Common Stock 2009-12-16 4 F 0 1834 3.29 D 11499 D Common Stock 196 I by Trust Represents shares that were automatically withheld to cover tax withholding obligations. On December 16, 2009, the Company accelerated 25% of the total restricted stock award granted on August 4, 2008 (as reported on Form 4 filed on August 6, 2008), not to exceed the unvested options as of November 6, 2009, as per the provisions of the 2004 Equity Incentive Plan. - On December 16, 2009, the Company accelerated 25% of the total stock options granted on November 13, 2008 (as reported on Form 4 filed on November 15, 2008), not to exceed the unvested options as of November 6, 2009, as per the provisions of the 2004 Equity Incentive Plan. - On December 16, 2009, the Company accelerated 25% of the total stock options granted on August 4, 2008 (as reported on Form 4 filed on August 6, 2008), not to exceed the unvested options as of November 6, 2009, as per the provisions of the 2004 Equity Incentive Plan. - On December 16, 2009, the Company accelerated 25% of the total stock options granted on July 11, 2005 (as reported on Form 3 filed on September 2, 2005), not to exceed the unvested options as of November 6, 2009, as per the provisions of the 2004 Equity Incentive Plan. /s/ Marcus D. Lowe 2009-12-18