SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 8)*

Sandridge Energy, Inc.

(Name of Issuer)

common stock, par value $0.001 per share

(Title of Class of Securities)

80007P869

(CUSIP Number)

Jesse Lynn, Esq.

Icahn Capital LP

767 Fifth Avenue, 47^th Floor

New York, New York 10153

(212) 702-4300

(Name, Address and Telephone Number of Person Authorized to

Receive Notices and Communications)

May 11, 2018

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box / /.

NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d‑7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

The Schedule 13D filed with the Securities and Exchange Commission on November 22, 2017, as previously amended (the "Schedule 13D"), by High River Limited Partnership, Hopper Investments LLC, Barberry Corp., Icahn Partners Master Fund LP, Icahn Offshore LP, Icahn Partners LP, Icahn Onshore LP, Icahn Capital LP, IPH GP LLC, Icahn Enterprises Holdings L.P., Icahn Enterprises G.P. Inc., Beckton Corp. and Carl C. Icahn (collectively, the "Reporting Persons"), with respect to the shares of common stock, par value $0.001 per share ("Shares"), of Sandridge Energy, Inc. (the "Issuer"), is hereby further amended to furnish the additional information set forth herein. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Schedule 13D.

Item 4 of the Schedule 13D is hereby amended by adding the following paragraphs at the end thereof:

On May 4, 2018, the Issuer filed with the Securities and Exchange Commission an amended preliminary proxy statement disclosing that the board of directors will be expanded from five to seven directors. The Issuer's expanded slate proposes to elect the five original nominees of the Issuer in addition to two of the Reporting Persons' nominees. In response, the Reporting Persons have determined to expand their slate of nominees from five to seven. The Reporting Persons believe that it is in the best interests of the Issuer to elect all seven of the Reporting Persons' nominees. Therefore, on May 11, 2018, the Reporting Persons notified the Issuer that the Reporting Persons intend to nominate and seek to elect 2 additional individuals to the Issuer's board of directors at the 2018 annual meeting of stockholders of the Issuer. Biographical information for these 2 individuals is below.

Jonathan Christodoro is currently a private investor. Mr. Christodoro served as a Managing Director of Icahn Capital LP, the entity through which Carl C. Icahn manages investment funds, from July 2012 to February 2017. Mr. Christodoro was responsible for identifying, analyzing and monitoring investment opportunities and portfolio companies for Icahn Capital. Prior to joining Icahn Capital, Mr. Christodoro served in various investment and research roles at P2 Capital Partners, LLC, Prentice Capital Management, LP and S.A.C. Capital Advisors, LP. Mr. Christodoro began his career as an investment banking analyst at Morgan Stanley, where he focused on merger and acquisition transactions across a variety of industries. Mr. Christodoro has been a director of: PayPal Holdings, Inc., a technology platform company that enables digital and mobile payments worldwide, since July 2015; Lyft, Inc., a mobile ride-sharing application, since May 2015; Enzon Pharmaceuticals, Inc., a biotechnology company, since October 2013 (and has been Chairman of the Board of Enzon since November 2013); and Herbalife Ltd., a nutrition company, since April 2013. Mr. Christodoro was previously a director of: Xerox Corporation, a provider of document management solutions, from June 2016 to December 2017; Cheniere Energy, Inc., a developer of natural gas liquefaction and export facilities and related pipelines, from August 2015 to August 2017; American Railcar Industries, Inc., a railcar manufacturing company, from June 2015 to February 2017; Hologic, Inc., a supplier of diagnostic, medical imaging and surgical products, from December 2013 to March 2016; eBay Inc., a global commerce and payments

company, from March 2015 to July 2015; and Talisman Energy Inc., an independent oil and gas exploration and production company, from December 2013 to May 2015. American Railcar Industries is indirectly controlled by Carl C. Icahn. Mr. Icahn has or previously had non−controlling interests in each of Xerox, PayPal, eBay, Lyft, Cheniere, Hologic, Talisman, Enzon and Herbalife through the ownership of securities. Mr. Christodoro received an M.B.A from the University of Pennsylvania's Wharton School of Business with Distinction, majoring in Finance and Entrepreneurial Management. Mr. Christodoro received a B.S. in Applied Economics and Management Magna Cum Laude with Honors Distinction in Research from Cornell University. Mr. Christodoro also served in the United States Marine Corps.

Nancy Dunlap serves as the private counsel and head of the private family office of former New Jersey Governor and United States Senator Jon S. Corzine. Since 1999, Nancy has overseen all personal investment and legal affairs of the Corzine Family Office. As the chair of the Corzine Family Office, Nancy has been responsible for all diligence, analysis and oversight of investment decisions ranging from hedge fund, commercial real estate, and direct private equity and debt investments. Nancy has also been responsible for the corporate and other relationships with financial firms, advisors, and public and private agencies that provide financial and other advisory services to the family office and its investment entities. As head of Mr. Corzine's private family office, Nancy also serves as a Trustee of the Jon J. Corzine Trust and as Director of the Jon S. Corzine Foundation; her duties include the oversight and management of the administrative and investment staff in the family officer, foundation, and related investments. From 2001 to 2010 during Mr. Corzine's tenure as U.S. Senator from New Jersey and as the Governor of New Jersey, Nancy was also responsible for overseeing the financial activities of one senate and two gubernatorial campaigns. Prior to joining Corzine, Nancy was Of Counsel for Nadborny & Brinberg, LLP a New York-based law firm where she has focused on commercial real estate and related corporate finance transactions. From 1992 to 1996, Nancy served as an associate and counsel for Euro Investors Property Inc., a real estate consulting firm, where she provided real estate investment identification, analysis, and portfolio management services for real estate ventures. Nancy was previously a director of Equita Sim a private investment bank headquartered in Milan, Italy from November 2010 to September 2015. Nancy was also previously a director of Amp Electric Vehicles from March 2010 to September 2012. Nancy received a Juris Doctor from St. John's University School of Law and a Bachelor of Arts from University of Denver.

SIGNATURE

After reasonable inquiry and to the best of each of the undersigned knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: May 11, 2018

ICAHN PARTNERS MASTER FUND LP

ICAHN OFFSHORE LP

ICAHN PARTNERS LP

ICAHN ONSHORE LP

BECKTON CORP.

HOPPER INVESTMENTS LLC

BARBERRY CORP.

HIGH RIVER LIMITED PARTNERSHIP

By: Hopper Investments LLC, general partner

By: Barberry Corp.

Name: Edward E. Mattner

Title: Authorized Signatory

ICAHN CAPITAL LP

By: IPH GP LLC, its general partner

By: Icahn Enterprises Holdings L.P., its sole member

By: Icahn Enterprises G.P. Inc., its general partner

IPH GP LLC

By: Icahn Enterprises Holdings L.P., its sole member

By: Icahn Enterprises G.P. Inc., its general partner

ICAHN ENTERPRISES HOLDINGS L.P.

By: Icahn Enterprises G.P. Inc., its general partner

ICAHN ENTERPRISES G.P. INC.

Name: SungHwan Cho

Title: Chief Financial Officer

CARL C. ICAHN

[Signature Page of Amendment No. 8 to Schedule 13D – Sandridge Energy, Inc.]