CHAP Chaparral Energy Inc

As filed with the Securities and Exchange Commission on October 9, 2020

Registration No. 333-219976

Registration No. 333-233244

Registration No. 333-235738

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT No. 1 TO

FORM S-8 REGISTRATION STATEMENT No. 333-219976

FORM S-8 REGISTRATION STATEMENT No. 333-233244

FORM S-8 REGISTRATION STATEMENT No. 333-235738

UNDER

THE SECURITIES ACT OF 1933

701 Cedar Lake Boulevard

Oklahoma City, Oklahoma 73114

Telephone: (405) 478-8770

(Address of Principal Executive Offices, Including Zip Code)

Chaparral Energy, Inc. Management Incentive Plan

Chaparral Energy, Inc. 2019 Long-Term Incentive Plan

Inducement Equity Awards

(Full title of the plan)

Justin Byrne

Vice President and General Counsel

701 Cedar Lake Boulevard

Oklahoma City, Oklahoma 73114

Telephone: (405) 478-8770

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

With a copy to:

J. Mark Metts

Sidley Austin LLP

1000 Louisiana Street, Suite 5900

Houston, Texas 77002

Telephone: (713) 495-4500

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 the Securities Act.  ☐

DEREGISTRATION OF SECURITIES

This Post-Effective Amendment No. 1 relates to the following Registration Statements on Form S-8 (collectively, the “Registration Statements”), filed with the Securities and Exchange Commission (the “SEC”) by Chaparral Energy, Inc. (the “Registrant”):

The Registrant is no longer issuing securities under any of the Plans. This Post-Effective Amendment No. 1 to the Registration Statements on Form S-8 is being filed in order to deregister all Shares that were registered under the Forms S-8 and remain unissued under the Plans.