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) November 26, 2013

STONE ENERGY CORPORATION

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (337) 237-0410

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:

Item 1.01. Entry into a Material Definitive Agreement.

Third Supplemental Indenture for 8.625% Senior Notes due 2017

On November 26, 2013, Stone Energy Corporation (the “Company”) announced that approximately $236.4 million, or approximately 63%, of the Company’s $375 million aggregate principal amount of 8.625% Senior Notes due 2017 (the “2017 Notes”) were validly tendered (and not validly withdrawn) prior to 5:00 p.m., New York City time, on November 26, 2013 pursuant to its previously announced tender offer and consent solicitation, which commenced on November 13, 2013. In addition, on November 27, 2013, Stone accepted all such 2017 Notes for payment, and later that day Stone made payment of approximately $256.5 million for the 2017 Notes. The tender offer will expire December 11, 2013, unless extended by the Company in its sole discretion. The Company intends to redeem all outstanding 2017 Notes not tendered prior to the expiration of the tender offer, but the timing of such redemption is in the discretion of the Company.

On November 26, 2013, the Company, its wholly owned subsidiary, Stone Energy Offshore, L.L.C. (“Stone Offshore”), and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), entered into the third supplemental indenture (the “Third Supplemental Indenture”) to the indenture governing the Company’s 2017 Notes following receipt of the requisite consents of the holders of the 2017 Notes. The Third Supplemental Indenture eliminates substantially all of the restrictive covenants and certain event of default provisions in the indenture governing the 2017 Notes. The Third Supplemental Indenture became operative upon the purchase by the Company of a majority of the outstanding 2017 Notes on November 27, 2013 pursuant to its tender offer.

The foregoing description of the Third Supplemental Indenture is a summary and is qualified in its entirety by reference to the Third Supplemental Indenture, a copy of which is filed herewith as Exhibit 4.1 and is incorporated herein by reference.

Issuance of Additional 7.500% Senior Notes due 2022

On November 27, 2013, the Company completed the public offering of $475 million aggregate principal amount of 7.500% Senior Notes due 2022 (the “2022 Notes”), which are fully and unconditionally guaranteed on a senior unsecured basis by Stone Offshore and by certain future restricted subsidiaries of the Company (collectively, the “Subsidiary Guarantors”). The 2022 Notes are an additional issuance of the Company’s outstanding 7.500% Senior Notes due 2022, which the Company issued in November 2012 in an aggregate principal amount of $300 million (the “Original Notes”). The 2022 Notes will be issued under the same indenture as the Original Notes and will be treated as a single series with the Original Notes for all purposes under the indenture, including waivers, amendments, redemptions and offers to purchase.

The terms of the 2022 Notes are governed by the indenture dated as of January 26, 2010 (the “Base Indenture”), among the Company, Stone Offshore, and the Trustee, as amended and supplemented by the second supplemental indenture, dated as of November 8, 2012, among the Company, Stone Offshore and the Trustee (the “Supplemental Indenture,” and together with the Base Indenture, the “Indenture”).

The 2022 Notes will mature on November 15, 2022, and interest is payable on the 2022 Notes on each May 15 and November 15, with the next interest payment date being May 15, 2014. The Company may redeem some or all of the 2022 Notes at any time on or after November 15, 2017 at the redemption prices specified in the Indenture, and it may redeem some or all of the 2022 Notes prior to November 15, 2017 at a “make-whole” redemption price as specified in the Indenture. The Company may also redeem up to 35% of the 2022 Notes prior to November 15, 2015 with cash proceeds from certain equity offerings at a redemption price of 107.500% of the principal amount thereof, plus accrued and unpaid interest, if any, to the redemption date. If the Company sells certain assets and does not reinvest the proceeds or repay senior indebtedness, or if the Company experiences certain changes of control, each as described in the Indenture, the Company must offer to repurchase the 2022 Notes.

The 2022 Notes are the Company’s senior unsecured obligations, and rank equally in right of payment with all of the Company’s existing and future senior indebtedness, and rank senior in right of payment to all of the Company’s existing and future subordinated indebtedness, including the 2017 Notes that remain outstanding. The 2022 Notes are effectively subordinated to all of the Company’s existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness (including all of the Company’s borrowings under the Company’s bank credit facility) and are structurally subordinated to all existing and future indebtedness and other liabilities of any of the Company’s subsidiaries that is not also a guarantor of the 2022 Notes.

The Indenture limits the Company’s ability and the ability of its Restricted Subsidiaries (as defined in the Indenture) to, among other things: (i) incur additional indebtedness; (ii) make certain investments or pay dividends or distributions on equity or purchase, redeem or retire equity; (iii) sell assets, including equity of the Restricted Subsidiaries; (iv) restrict dividends or other payments by Restricted Subsidiaries; (v) create liens that secure indebtedness; (vi) enter into transactions with affiliates; and (vii) merge or consolidate with another company. These covenants are subject to a number of important exceptions and qualifications.

The Indenture contains customary events of default, including:

If an event of default under the Indenture occurs and is continuing, the Trustee or the holders of at least 25% in principal amount of the outstanding 2022 Notes may declare the principal of, premium, if any, and accrued and unpaid interest, if any, on the 2022 Notes to be due and payable, or, in the case of certain events of default relating to bankruptcy, insolvency or reorganization, those amounts will automatically become immediately due and payable.

Other material terms of the 2022 Notes, the Base Indenture and the Supplemental Indenture are described in the prospectus supplement, dated November 13, 2013, as filed by the Company with the Securities and Exchange Commission (the “Commission”) on November 14, 2013.

The foregoing descriptions of the Base Indenture, the Supplemental Indenture and the 2022 Notes are summaries and are qualified in their entirety by reference to such Base Indenture and Supplemental Indenture (including the form of 2022 Notes attached thereto). A copy of the Base Indenture was attached as Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on January 29, 2010 and is incorporated herein by reference. A copy of the Supplemental Indenture (including the form of 2022 Notes attached thereto) was attached as Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on November 8, 2012 and is incorporated herein by reference.

The Company and Stone Offshore registered the sale of the 2022 Notes and the underlying guarantees with the Commission pursuant to a shelf Registration Statement on Form S-3 (Registration No. 333-184532) that became effective upon filing on October 22, 2012 (the “Registration Statement”). The Company received net proceeds from the offering of the 2022 Notes of approximately $480.1 million, after deducting underwriting discounts and commissions and estimated expenses. The Company used approximately $256.5 million of the net proceeds to fund the initial settlement of the 2017 Notes and intends to use the remaining proceeds to redeem any of the 2017 Notes not acquired in its pending tender offer and for general corporate purposes.

As previously reported, on November 13, 2013, the Company and Stone Offshore entered into an underwriting agreement with Merrill Lynch, Pierce, Fenner & Smith Incorporated, Barclays Capital Inc. and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein, in connection with the underwritten public offering of the 2022 Notes.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The disclosure contained under Item 1.01 above is incorporated by reference in its entirety into this Item 2.03.

Item 3.03. Material Modification to Rights of Security Holders.

The description of the Third Supplemental Indenture for the 2017 Notes contained under Item 1.01 above is incorporated by reference in its entirety into this Item 3.03.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits:

SIGNATURE

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

EXHIBIT INDEX