X0303 4 2010-10-07 0 0001040593 CARRIZO OIL & GAS INC CRZO 0001257331 BOLING PAUL F 1000 LOUISIANA STREET SUITE 1500 HOUSTON TX 77002 0 1 0 0 CFO, VP, Secretary, Treasurer Common Stock 2010-10-07 4 A 0 40358 0 A 79820 D Common Stock 2010-10-07 4 S 0 1200 24.32 D 78620 D Stock Appreciation Rights 17.28 2010-10-07 4 A 0 30969 0 A 2017-05-29 Common Stock 30969 30969 D The sales reported in this Form 4 were effected to satisfy the reporting person's federal income tax obligations with respect to the vesting of equity awards. 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 $24.30 to $24.35, inclusive. The stock appreciation rights are settled in cash. The stock appreciation rights vest in three equal installments on May 29, 2011, May 29, 2012 and May 29, 2013. /s/Paul F. Boling 2010-10-12