X0303 4 2010-10-25 0 0001313024 Venoco, Inc. VQ 0001381089 Marquez Timothy 370 17TH STREET SUITE 3900 DENVER CO 80202 1 1 1 0 Chief Executive Officer 0001381116 Marquez Bernadette 370 17TH STREET SUITE 3900 DENVER CO 80202 0 0 1 0 0001381082 Marquez Trust 370 17TH STREET SUITE 39000 DENVER CO 80202 0 0 1 0 Common Stock 2010-10-25 4 S 0 16000 16.0086 D 28367442 I See Footnote Common Stock 2010-10-26 4 S 0 2750 15.7536 D 28364692 I See Footnote Common Stock 859517 D The sales reported in this Form 4 were made pursuant to the terms of a Rule 10b5-1 Trading Plan adopted by the Marquez Trust on November 14, 2009, as amended December 23, 2009. This transaction was executed in multiple trades at prices ranging from $15.71 to $16.31. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the SEC staff, the issuer or a security holder of the issuer upon request, full information regarding the number of shares and prices at which each transaction was effected. All such shares are held by the Marquez Trust under the Trust Agreement dated February 26, 2002, as amended April 22, 2010, for which Timothy Marquez and his wife Bernadette Marquez serve as trustees. This transaction was executed in multiple trades at prices ranging from $15.71 to $15.80. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the SEC staff, the issuer or a security holder of the issuer upon request, full information regarding the number of shares and prices at which each transaction was effected. All such shares represent restricted stock granted to Timothy Marquez on March 27, 2007, February 28, 2008, March 5, 2009 and February 28, 2010. These shares are subject to future vesting requirements. /s/ Timothy Marquez 2010-10-26 /s/ Bernadette Marquez 2010-10-26 /s/ Timothy Marquez, as Trustee of the Marquez Trust 2010-10-26