UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 19, 2012

Registrant’s telephone number, including area code: (214) 871-0400

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 3.02 Unregistered Sales of Equity Securities

Cross Border Stock Purchase Agreements

On October 2, 2012, October 4, 2012 and October 17, 2012, Red Mountain Resources, Inc. (the “Company”) entered into stock purchase agreements with two stockholders of Cross Border Resources, Inc. (“Cross Border”) pursuant to which the stockholders agreed to sell an aggregate of 512,329 shares of common stock of Cross Border in exchange for the issuance of an aggregate of 1,024,658 shares of the Company’s common stock. The sale of the Company’s common stock was made in reliance on the private placement exemption from the registration requirements of the Securities Act of 1933, as amended, provided by Section 4(2) thereof and Rule 506 of Regulation D promulgated thereunder. The sale of the Company’s common stock was conducted without general solicitation or general advertising, each of the purchasers represented that it was an “accredited investor” as defined in Rule 501 of Regulation D and each purchaser represented that the common stock was acquired for its own account and was not intended to be sold or disposed of in violation of securities laws. The common stock to be issued to the purchasers will also contain appropriate restricted stock legends.

As of October 17, 2012, the Company owned of record 6,415,262 shares of Cross Border common stock, representing 39.7% of the outstanding shares of common stock of Cross Border. In addition, as of October 17, 2012, the Company had outstanding stock purchase agreements pursuant to which it had agreed to acquire 7,919,095 shares of Cross Border common stock and owned warrants to acquire an additional 2,136,164 shares of Cross Border common stock.

Debenture Purchase Agreements

On October 8, 2012, the Company entered into debenture purchase agreements with two holders of Series 2009B Debentures (the “2009B Debentures”) of O&G Leasing, LLC (“O&G”) pursuant to which the holders agreed to sell an aggregate of $165,000 principal amount of 2009B Debentures plus any accrued and unpaid interest, in exchange for the issuance of 154,948 shares of the Company’s common stock.

On October 15, 2012, the Company entered into a debenture purchase agreement with a holder of Senior Series 2009A Debentures (the “2009A Debentures”) of O&G pursuant to which the holder agreed to sell an aggregate of $75,000 principal amount of 2009A Debentures plus any accrued and unpaid interest, in exchange for the issuance of 67,042 shares of the Company’s common stock.

On October 18, 2012, the Company entered into debenture purchase agreements with three holders of the 2009A Debentures and 2009B Debentures pursuant to which the holders agreed to sell an aggregate of $3,030,000 principal amount of 2009A Debentures and $1,255,000 principal amount of 2009B Debentures, plus any accrued and unpaid interest, in exchange for the issuance of 3,887,039 shares of the Company’s common stock.

The sale of the Company’s common stock was made in reliance on the private placement exemption from the registration requirements of the Securities Act of 1933, as amended, provided by Section 4(2) thereof and Rule 506 of Regulation D promulgated thereunder. The sale of the Company’s common stock was conducted without general solicitation or general advertising, each of the purchasers represented that it was an “accredited investor” as defined in Rule 501 of Regulation D and each purchaser represented that the common stock was acquired for its own account and not with a view to resale or distribution. The common stock to be issued to the purchasers will also contain appropriate restricted stock legends.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.