X0304 4 2011-11-18 0 0001040593 CARRIZO OIL & GAS INC CRZO 0001044584 JOHNSON S P IV 1000 LOUISIANA STREET SUITE 1500 HOUSTON TX 77002 1 1 0 0 President and CEO Common Stock 2011-11-18 4 M 0 45000 4.01 A 655265 D Common Stock 2011-11-18 4 S 0 21350 25.6582 A 633915 D Stock Option (right to buy) 4.01 2011-11-18 4 M 0 45000 0 A 2011-12-06 Common Stock 45000 0 D Broker-assisted exercise and sale of an option granted December 6, 2001 that would expire on December 6, 2011. The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this Form 4. These shares were sold in multiple transactions at prices ranging from $25.62 to $25.73, inclusive. The options became exercisable in annual increments of one third of the total number of shares of common stock subject thereto, beginning on the first anniversary of the date of grant (December 6, 2001). /s/Paul F. Boling, attorney-in-fact 2011-11-21