UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

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): March 22, 2013

HARBINGER GROUP INC.

(Exact name of registrant as specified in its charter)

Delaware

(State or other jurisdiction

of incorporation)

(212) 906-8555

(Registrant’s telephone number, including area code)

(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:

Subsidiary Notes Offering

On March 22, 2013, Harbinger Group Inc. (“HGI”) announced that its wholly-owned subsidiary, Fidelity & Guaranty Life Holdings, Inc. (“FGL”), priced an offering of $300.0 million aggregate principal amount of its 6.375% senior notes due 2021 (the “notes”).

The notes will not be registered under the Securities Act of 1933, as amended, and may not be offered or sold in the United States absent such registration or an exemption from the registration requirements of such Act. This report shall not constitute an offer to sell or a solicitation of an offer to buy any security and shall not constitute an offer, solicitation or sale of any securities in any jurisdiction where such an offering or sale would be unlawful.

Forward Looking Statements

“Safe Harbor” Statement Under the Private Securities Litigation Reform Act of 1995: This document contains, and certain oral statements made by our representatives from time to time may contain, forward-looking statements, including the statements herein regarding the FGL notes offering. Such statements are subject to risks and uncertainties that could cause actual results, events and developments to differ materially from those set forth in or implied by such statements. These statements are based on the beliefs and assumptions of HGI’s management and the management of HGI’s subsidiaries (including target businesses). Generally, forward-looking statements include information concerning possible or assumed future actions, events, results, strategies and expectations and are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans,” “seeks,” “estimates,” “projects,” “may,” “will”, “could,” “might,” or “continues” or similar expressions. Factors that could cause actual results, events and developments to differ include, without limitation: the ability of HGI’s subsidiaries (including, target businesses following their acquisition) to generate sufficient net income and cash flows to make upstream cash distributions, capital market conditions, HGI and its subsidiaries ability to identify any suitable future acquisition opportunities, efficiencies/cost avoidance, cost savings, income and margins, growth, economies of scale, combined operations, future economic performance, conditions to, and the timetable for, completing the integration of financial reporting of acquired or target businesses with HGI or HGI subsidiaries, completing future acquisitions and dispositions, litigation, potential and contingent liabilities, management’s plans, changes in regulations, taxes and the forward looking statements included under the caption “Risk Factors” in HGI’s most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q. All forward-looking statements described herein are qualified by these cautionary statements and there can be no assurance that the actual results, events or developments referenced herein will occur or be realized. HGI does not undertake any obligation to update or revise forward-looking statements to reflect changed assumptions, the occurrence of unanticipated events or changes to future operation results.

A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

This information shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not incorporated by reference into any filing of HGI, whether made before or after the date of this report.

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.

EXHIBIT INDEX