X0305 4 2012-03-26 0 0001040593 CARRIZO OIL & GAS INC CRZO 0001044584 JOHNSON S P IV 500 DALLAS STREET SUITE 2300 HOUSTON TX 77002 1 1 0 0 President and CEO Common Stock 2012-03-26 4 S 0 6000 30.1367 D 627915 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on December 28, 2010. 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 range set forth in this Form 4. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.84 inclusive. /s/ Paul F. Boling, attorney-in-fact 2012-03-28