UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934*

(Amendment No.     )

Halcón Resources Corporation

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

40537Q209

(CUSIP Number)

COPY TO:

Joshua Beiser, Esq.

Assistant Secretary

Kellen Holdings, LLC

175 Berkeley Street

Boston, MA 02116

(617) 357-9500

(Name, Address and Telephone Number of Persons Authorized to Receive Notices and Communications)

September 17, 2012

(Dates of Events which Require Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 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(b) for other parties to whom copies are to be sent.

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

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The class of equity securities to which this Statement on Schedule 13D (the “Statement”) relates is the common stock, par value $0.0001 per share (the “Common Stock” or “Halcón Common Stock”) of Halcón Resources Corporation, a Delaware corporation (the “Issuer” or “Halcón”). The principal executive offices of the Issuer are located at 1000 Louisiana Street, Suite 6700, Houston, Texas 77002.

This Statement is filed on behalf of the following person:

Kellen Holdings, LLC (“Kellen”), a Delaware limited liability company, c/o Liberty Energy Holdings, LLC 175 Berkeley Street, Boston, Massachusetts 02116. Kellen’s principal business is investment in hydrocarbons and related energy investments.

In accordance with the provisions of General Instruction C to Schedule 13D, information concerning the directors, executive officers and controlling persons of Kellen, required by Item 2 of Schedule 13D is listed on Schedule A hereto and is incorporated by reference herein.

Within the last five years, neither Kellen, nor to the best of their respective knowledge, any executive officer or director of Kellen, has been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors) or has been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

The securities of the Issuer as to which this schedule is filed were acquired by Kellen as part of a distribution of Halcón Common Stock by HALRES LLC. On September 17, 2012, HALRES LLC distributed shares of Halcón Common Stock to its members. Kellen is a member in HALRES LLC and was issued 14,666,666 shares of Halcón Common Stock.

Kellen originally acquired the securities in HALRES LLC for investment purposes and received and intends to maintain the Issuer’s securities distributed to it from HALRES LLC for investment purposes. Depending on market conditions, its continuing evaluation of the business and prospects of the Issuer and other factors, Kellen may dispose of or acquire additional securities of the Issuer. Kellen intends to monitor and evaluate its investment in the Issuer in light of pertinent factors, market conditions, the Issuer’s performance and prospects, the trading prices of Halcón Common Stock, conditions in the industry and general economic conditions. Kellen may make additional purchases of Halcón Common Stock in the future through market transactions or otherwise, maintain its current investment, or dispose of some of all of Halcón Common Stock. Except as set forth below, Kellen does not have any current plans or proposals which would relate to or would result in (a) the acquisition by any person of additional securities of the Issuer, or the disposition of securities of the Issuer; (b) an extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries; (c) a sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; (d) any change in the present board of directors or management of the Issuer, including any plans or proposals to change

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the number or term of directors or to fill any existing vacancies on the board; (e) any material change in the present capitalization or dividend policy of the Issuer; (f) any other material change in the Issuer’s business or corporate structure, including but not limited to, if the Issuer is a registered closed-end-investment company, any plans or proposals to make any changes in its investment policy for which a vote is required by Section 13 of the Investment Company Act of 1940; (g) changes in the Issuer’s charter, bylaws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person; (h) causing a class of securities of the Issuer to be delisted from a national securities exchange or to cease to be authorized to be quoted on an inter-dealer quotation system of a registered national securities association; (i) a class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934, as amended, or (j) any action similar to any of those enumerated above.

The ownership percentages set for below are based on 216,217,425 shares of the Issuer’s Common Stock outstanding as reported in the Form 3 Registration Statement of the Issuer filed with the Securities and Exchange Commission on September 12, 2012.

(a) Kellen owns an aggregate amount of 14,666,666 shares of Halcón Common Stock, which constitutes approximately 6.8% of the 216,217,425 issued and outstanding shares of Halcón Common Stock.

(b) Kellen has the sole power to vote or direct the vote of, and the sole power to dispose or direct the disposition of, 14,666,666 shares. Kellen has no shared power to either vote or dispose of the shares.

(c) Except as otherwise described herein, including in Item 3, or in any Exhibit filed herewith, to the knowledge of the reporting person, none of the persons named in response to paragraph (a) above has effected any transaction in shares of Halcón Common Stock during the past 60 days.

(d) With respect to Kellen, to the best of its knowledge, no other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceedings from the sale of, such securities, where such interest relates to either more or less than five percent of the class.

(e) Not applicable.

Daniel Rioux, an officer of Kellen, sits on the Issuer’s Board of Directors. Pursuant to a director’s stock agreement, Kellen is to receive 5,000 shares of Halcón Restricted Stock which vests on December 7, 2012.

None

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SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

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SCHEDULE A

Controlling Persons

Kellen Holdings, LLC, a Delaware limited liability company, is a direct subsidiary of Liberty Energy Holdings, LLC, a Delaware limited liability company (“LEH”) and is an indirect subsidiary of Liberty Mutual Holding Company Inc., a Massachusetts mutual holding company. Liberty Mutual Holding Company Inc. is the ultimate controlling person of Kellen Holdings, LLC. Liberty Mutual Holding Company Inc. is a mutual holding company wherein its members are entitled to vote at meetings of the company. No such member is entitled to cast 10% or more of the votes. Liberty Mutual Holding Company Inc. has issued no voting securities.

The officer and director information for Kellen Holdings, LLC and Liberty Mutual Holding Company Inc. is as set forth below. The officer and director information for LEH is the same as Kellen.

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Kellen Holdings, LLC

175 Berkeley Street

Boston, Massachusetts 02116

Executive Officers

Directors

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Executive Officers and Directors of Ultimate Control Person

Liberty Mutual Holding Company Inc.

175 Berkeley Street

Boston, Massachusetts 02116

Executive Officers

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Liberty Mutual Holding Company Inc.

175 Berkeley Street

Boston, Massachusetts 02116

Directors

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