UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 8)*

DESTINATION XL GROUP, INC.

(Name of Issuer)

Common Stock, $0.01 par value

(Title of Class of Securities)

25065K104

(CUSIP Number)

Red Mountain Capital Partners LLC

Attn: Willem Mesdag

1999 Avenue of the Stars, Suite 1100, PMB #314

Los Angeles, California 90067

Telephone (310) 432-0200

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

September 9, 2021

(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 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 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).

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This Amendment No. 8 amends and supplements the Schedule 13D filed with the Securities and Exchange Commission (the “SEC”) on March 25, 2013, as amended by Amendment No. 1 thereto, filed with the SEC on October 10, 2013, Amendment No. 2 thereto, filed with the SEC on December 16, 2013, Amendment No. 3 thereto, filed with the SEC on January 31, 2014, Amendment No. 4 thereto, filed with the SEC on March 24, 2014, Amendment No. 5 thereto, filed with the SEC on April 2, 2014, Amendment No. 6 thereto, filed with the SEC on June 13, 2017, and Amendment No. 7 thereto, filed with the SEC on April 4, 2018, in each case by (i) Red Mountain Capital Partners LLC, a Delaware limited liability company (“RMCP LLC”), (ii) Red Mountain Partners, L.P., a Delaware limited partnership (“RMP”), (iii) RMCP GP LLC, a Delaware limited liability company (“RMCP GP”), (iv) Red Mountain Capital Management, Inc., a Delaware corporation (“RMCM”), and (v) Willem Mesdag, a natural person and citizen of the United States of America, with respect to the common stock, par value $0.01 per share (the “Common Stock”), of Destination XL Group, Inc., a Delaware corporation (“Destination XL”). The filing of any amendment to this Schedule 13D (including the filing of this Amendment No. 8) shall not be construed to be an admission by the Reporting Persons (as defined below) that a material change has occurred in the facts set forth in this Schedule 13D or that such amendment is required under Rule 13d-2 of the Securities Exchange Act of 1934, as amended.

RMCP LLC, RMP, and RMCP GP are sometimes collectively referred to herein as “Red Mountain.” Red Mountain, RMCM and Mr. Mesdag are sometimes collectively referred to herein as the “Reporting Persons.”

Item 3 of this Schedule 13D is hereby amended to include the following information:

On August 2, 2021, the Reporting Persons acquired 6,237 shares of Common Stock issued in connection with Mr. Mesdag’s service on the board of directors of Destination XL (the “Board”).

Item 4 of this Schedule 13D is hereby amended to include the following information:

On September 9, 2021, RMP entered into an underwriting agreement (the “Underwriting Agreement”) with D.A. Davidson & Co. (the “Underwriter Representative”) and Destination XL. Pursuant to the Underwriting Agreement, RMP agreed to sell 5,733,076 shares of Common Stock to the Underwriter at a price of $5.83465 per share (inclusive of the underwriting discount). Accordingly, the aggregate purchase price for the shares of Common Stock being sold by RMP pursuant to the Underwriting Agreement is approximately $33,450,492 (inclusive of the underwriting discount).

The Underwriting Agreement contains customary representations, warranties and covenants of Destination XL and also provides for customary indemnification by Destination XL and RMP against certain liabilities and customary contribution provisions in respect of those liabilities.

The sale of Common Stock by RMP is being made pursuant to a preliminary prospectus supplement and final prospectus supplement related to Destination XL’s shelf registration statement on Form S-3 (Registration No. 333-256990) that became effective on June 21, 2021, each of which has been filed with the SEC. The offering is being made only by means of the prospectus supplement and the accompanying prospectus.

The sale of the Common Stock pursuant to the Underwriting Agreement closed on September 14, 2021.

In connection with the offering, on September 9, 2021, RMP, RMCP LLC and Mr. Mesdag, in his capacity as a director of Destination XL, entered into lock-up agreements (the “Lock-Up Agreements”) with the Underwriter Representative that, subject to certain exceptions, restricts the sale of the shares of Common Stock and certain other securities by RMP and RMCP LLC for a 90 day period following the date of the prospectus supplement.

On September 15, 2021, RMP made a distribution in-kind for no consideration of its remaining shares of Common Stock to its equity holders, including RMCP, RMCM and entities beneficially owned by Mr. Mesdag.

The foregoing references to and description of the Underwriting Agreement and Lock-Up Agreements do not purport to be complete and are subject, and are qualified in their entirety by reference, to the full text of the Underwriting Agreement and form of Lock-Up Agreement, which is incorporated by reference into this Item 4.

Items 5(a), 5(b) 5(c) and 5(e) of this Schedule 13D are hereby amended and restated as follows:

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RMCP LLC beneficially owns directly 1,763,373 shares of Common Stock, which represent approximately 2.8% of the outstanding Common Stock. RMCP LLC has the sole power to vote or direct the vote, and the sole power to dispose or direct the disposition, of all such 1,763,373 shares of Common Stock.

RMCM beneficially owns directly 204,618 shares of Common Stock, which represent approximately 0.3% of the outstanding Common Stock. RMCM has the sole power to vote or direct the vote, and the sole power to dispose or direct the disposition, of all such 204,618 shares of Common Stock. Because RMCM may be deemed to control RMCP LLC, RMCM may be deemed to beneficially own, and to have the power to vote or direct the vote of, or dispose or direct the disposition of, all of the Common Stock beneficially owned by RMCP LLC. Therefore, RMCM may be deemed to beneficially own, in the aggregate, 1,967,991 shares of Common Stock, which represent approximately 3.1% of the outstanding Common Stock.

Mr. Mesdag beneficially owns directly 562,561 shares of Common Stock, which represent approximately 0.9% of the outstanding Common Stock. Mr. Mesdag has the sole power to vote or direct the vote, and the sole power to dispose or direct the disposition, of all such 204,618 shares of Common Stock. Because Mr. Mesdag may be deemed to control RMCP LLC, and RMCM, Mr. Mesdag may be deemed to beneficially own, and to have the power to vote or direct the vote of, or dispose or direct the disposition of, all of the Common Stock beneficially owned by RMCP LLC, and RMCM. In addition, Mr. Mesdag may be deemed to own the 15,000 shares of Common Stock receivable upon exercise of the Director Options, all of which are currently exercisable, as well as the 435,568 shares of Common Stock receivable upon settlement of the Deferred Stock as a result of a separation of service from the Board. As a result, Mr. Mesdag may be deemed to beneficially own, in the aggregate, 2,981,120 shares of Common Stock, which represent approximately 4.7% of the outstanding Common Stock.

Each of RMCP LLC, RMP and RMCP GP affirms membership in a group with each other but disclaims membership in a group with RMCM or Mr. Mesdag. Each of RMCM and Mr. Mesdag disclaims membership in a group with any person.

The filing of this Schedule 13D shall not be construed as an admission that any Reporting Person is the beneficial owner of any of the shares of Common Stock that such Reporting Person may be deemed to beneficially own. Without limiting the foregoing sentence, each of RMCM and Mr. Mesdag disclaims beneficial ownership of all shares of Common Stock reported as beneficially owned by RMP or RMCP LLC in this Schedule 13D, and RMCM disclaims beneficial ownership of all shares of Common Stock reported in this Schedule 13D. In addition, the filing of this Schedule 13D shall not be construed as an admission that any partner, member, director, officer or affiliate of any Reporting Person is the beneficial owner of any of the shares of Common Stock that such partner, member, director, officer or affiliate may be deemed to beneficially own. Without limiting the foregoing sentence, Mr. Teets disclaims beneficial ownership of all shares of Common Stock reported in this Schedule 13D.

(c) The information set forth in Item 4 above is hereby incorporated by reference into this Item 5(c).

(e) As of September 15, the Reporting Persons ceased to be the beneficial owners of more than 5% of the Common Stock.

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Item 6 of this Schedule 13D is hereby amended to include the following information:

The information set forth in Item 4 above is hereby incorporated by reference into this Item 6.

Item 7 of this Schedule 13D is hereby amended to include the following information:

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EXHIBIT INDEX

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SIGNATURE

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.

Dated: September 16, 2021

Exhibit 5

LOCK-UP AGREEMENT

Destination XL Group, Inc.

555 Turnpike Street

Canton, Massachusetts 02021

D.A. DAVIDSON & CO.

611 Anton Boulevard, Suite 600

Costa Mesa, CA 92626

Ladies and Gentlemen:

The undersigned refers to the proposed Underwriting Agreement (the “Underwriting Agreement”) among Destination XL Group, Inc., a Delaware corporation (the “Company”), Red Mountain Partners, L.P., (the “Selling Stockholder”), and the several underwriters named therein (the “Underwriters”). As an inducement to the Underwriters to execute the Underwriting Agreement in connection with the proposed public offering of shares of the Company’s common stock, $0.01 par value per share (“Common Stock”), the undersigned hereby agrees that from the date hereof and until 90 days after the date of the final prospectus used to sell the Common Stock (the “Public Offering Date”) pursuant to the Underwriting Agreement (such 90-day period being referred to herein as the “Lock-Up Period”), the undersigned will not (and will cause any spouse or immediate family member of the spouse or the undersigned living in the undersigned’s household, any partnership, corporation or other entity within the undersigned’s control, and any trustee of any trust that holds Common Stock or other securities of the Company for the benefit of the undersigned or such spouse or family member not to) offer, sell, contract to sell (including any short sale), pledge, hypothecate, establish an open “put equivalent position” within the meaning of Rule 16a-1(h) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), grant any option, right or warrant for the sale of, purchase any option or contract to sell, sell any option or contract to purchase, or otherwise encumber, dispose of or transfer, or grant any rights with respect to, directly or indirectly, any shares of Common Stock or securities convertible into or exchangeable or exercisable for any shares of Common Stock, enter into a transaction which would have the same effect, or enter into any swap, hedge or other arrangement that transfers, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such aforementioned transaction is to be settled by delivery of the Common Stock or such other securities, in cash or otherwise, or publicly disclose the intention to make any such offer, sale, pledge or disposition, or to enter into any such transaction, swap, hedge or other arrangement, without, in each case, the prior written consent of D.A. Davidson & Co. (“D.A. Davidson”), which consent may be withheld in D.A. Davidson’s sole discretion.

Notwithstanding the foregoing, the undersigned may transfer the undersigned’s shares of Common Stock or securities convertible into or exchangeable or exercisable for any shares of Common Stock without the prior written consent of D.A. Davidson:

Notwithstanding the foregoing, the written consent of D.A. Davidson shall not be required for a transfer or distribution of shares of Common Stock by the Selling Stockholder to its limited partners (other than Red Mountain Capital Partners LLC and its affiliates) and such limited partners shall not be required to be bound by the terms of this Lock-up Agreement.

D.A. Davidson may consent (which consent may be withheld in its sole discretion) to an early release from the Lock-Up Period if in its sole and absolute discretion, the market for the Common Stock would not be adversely impacted by sales and in cases of financial emergency.

In addition, the undersigned agrees that, during the period commencing on the date hereof and ending 90 days after the Public Offering Date, without the prior written consent of D.A. Davidson (which consent may be withheld in its sole discretion): (a) the undersigned will not request, make any demand for or exercise any right with respect to, the registration of any Common Stock or any security convertible into or exercisable or exchangeable for Common Stock and (b) the undersigned waives any and all notice requirements and rights with respect to the registration of any such security pursuant to any agreement, understanding or otherwise to which the undersigned is a party.

In furtherance of the foregoing, the Company and its transfer agent and registrar are hereby authorized to (a) decline to make any transfer of shares of Common Stock if such transfer would constitute a violation or breach of this Agreement and (b) place legends and stop transfer instructions on any such shares of Common Stock owned or beneficially owned by the undersigned.

This Agreement is irrevocable and shall be binding on the undersigned and the successors, heirs, personal representatives and assigns of the undersigned. This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without regard to choice of law rules. This Agreement shall lapse and become null and void if the Public Offering Date shall not have occurred on or before September 30, 2021.