Item 1.01 Entry into a Material Definitive Agreement.
On April 22, 2009, Carrizo Oil & Gas, Inc. (the "Company") entered into an Eighth Amendment (the "Eighth Amendment") to the Credit Agreement dated as of May 25, 2006 among the Company, certain subsidiaries of the Company, the lenders party thereto and Guaranty Bank, as administrative agent (the "Credit Agreement").
The Eighth Amendment amends the Credit Agreement to, among other things,
(1) adjust the maximum ratio of total net debt to Consolidated EBITDAX (as defined in the Credit Agreement) from 4.00 to 1.00 to a maximum ratio of
(a) 4.25 to 1.00 for the quarter ending June 30, 2009, (b) 4.50 to 1.00 for the quarter ending September 30, 2009, (c) 4.75 to 1.00 for each quarter ending on or after December 31, 2009 and on or before September 30, 2010, (d) 4.25 to 1.00 for the quarter ending December 31, 2010, and (e) 4.00 to 1.00 for each quarter ending on or after March 31, 2011; (2) modify the calculation of total net debt for purposes of determining the ratio of total net debt to Consolidated EBITDAX to exclude the following amounts, which represent a portion of the Company's 4.375% Senior Convertible Notes due 2028 deemed to be an equity component under FASB Staff Position Accounting Principles Board 14-1, "Accounting for Convertible Debt Instruments That May Be Settled In Cash Upon Conversion":
$51,252,980 during 2009, $38,874,756 during 2010, $26,021,425 during 2011 and $12,674,753 during 2012 until the maturity date; (3) add a new senior leverage ratio, which requires that the Company's ratio of senior debt (which excludes debt attributable to the Company's 4.375% Senior Convertible Notes due 2028) to Consolidated EBITDAX not exceed 2.25 to 1.00; (4) modify the interest rate margins applicable to Eurodollar loans from a range of between 2.00% and 3.50% to a range of between 2.25% and 3.25% (depending on the then-current level of borrowing base usage); (5) modify the interest rate margins applicable to base rate loans from a range of between 0.75% and 2.25% to a range of between 1.00% and 2.00% (depending on the then-current level of borrowing base usage); and
(6) establish new procedures governing the modification of swap agreements. The foregoing description of the Eighth Amendment is not complete and is qualified by reference to the complete document, which is attached hereto as Exhibit 10.1 and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits.

(d) Exhibits. Exhibit Description 10.1 Eighth Amendment dated as of April 22, 2009 to Credit Agreement dated May 25, 2006 by and among Carrizo Oil & Gas, Inc., as Borrower, Certain Subsidiaries of Borrower, as Guarantors, the Lenders party thereto, and Guaranty Bank, as administrative agent.

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