CRZO Carrizo Oil and Gas Inc

As filed with the Securities and Exchange Commission on December 20, 2019

Registration No. 333-221121

Registration No. 333-221122

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1 TO:

FORM S-3 REGISTRATION STATEMENT NO. 333-221121

FORM S-3 REGISTRATION STATEMENT NO. 333-221122

Under

THE SECURITIES ACT OF 1933

2000 W. Sam Houston Parkway S., Suite 2000

Houston, Texas 77042

(281) 589-5200

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Michol L. Ecklund

Senior Vice President, General Counsel and Corporate Secretary

2000 W. Sam Houston Parkway S., Suite 2000

Houston, Texas 77042

(281) 589-5200

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Sean T. Wheeler, P.C.

Lanchi D. Huynh

Kirkland & Ellis LLP

609 Main Street

Houston, TX 77002

United States

(713) 836-3600

Approximate date of commencement of proposed sale to the public: Not applicable.

If the only securities being registered on this Form are to be offered pursuant to dividend or interest reinvestment plans, please check the following box.  ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.  ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act.  ☐

EXPLANATORY NOTE

DEREGISTRATION OF SECURITIES

Pursuant to that certain Agreement and Plan of Merger, dated as of July 14, 2019 (as amended), by and between Callon Petroleum Company, a Delaware corporation (“Callon”), and Carrizo Oil & Gas, Inc., a Texas corporation (“Carrizo”), Carrizo merged with and into Callon (the “Merger”) on December 20, 2019, with Callon surviving the Merger. As a result of the Merger, Callon is Carrizo’s successor-in-interest.

Callon (as Carrizo’s successor-in-interest) has terminated all offerings of Carrizo’s securities pursuant to Carrizo’s existing registration statements. Accordingly, Callon (as Carrizo’s successor-in-interest) and the additional registrants set forth in the “Table of Additional Registrants” on the cover page hereto (together, the “Registrants”) are filing these post-effective amendments (these “Post-Effective Amendments”) to the following Registration Statements on Form S-3 (the “Registration Statements”), which have been previously filed by Carrizo and the other applicable Registrants with the Securities and Exchange Commission (the “SEC”), to deregister:

The Registrants, by filing these Post-Effective Amendments, hereby terminate the effectiveness of the Registration Statements. These Post-Effective Amendments are being filed in accordance with an undertaking made by the applicable Registrants in Part II of each Registration Statement to remove from registration by means of a post-effective amendment any securities that had been registered for issuance but remain unsold at the termination of the offering.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, each of the Registrants certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused these Post-Effective Amendments to the above-referenced Registration Statements to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on December 20, 2019.

No other person is required to sign these Post-Effective Amendments in reliance upon Rule 478 under the Securities Act of 1933, as amended.