This Amendment No. 1 (this Amendment) amends and supplements the
Solicitation/Recommendation Statement on Schedule 14D-9 filed with the Securities and Exchange Commission (the SEC) on January 10, 2023, (together with any amendments and supplements thereto,
the Schedule 14D-9) by Horizon Global Corporation, a Delaware corporation (Horizon), and relates to the offer by PHX Merger Sub, Inc., a Delaware corporation (Purchaser) and
a wholly owned subsidiary of First Brands Group, LLC, a Delaware limited liability company (Parent), to purchase all of the outstanding shares of common stock, par value $0.01 per share (the Common Stock), and all of the
outstanding shares of Series B Preferred Stock, par value $0.01 per share (the Preferred Stock) of Horizon, at a price of $1.75 per share of Common Stock and an amount equal to the Redemption Price (as defined in the Certificate of
Designations, Preferences and Rights of Series B Preferred Stock of Horizon Global Corporation attached as Exhibit (d) hereto and incorporated herein by reference) per share of Preferred Stock calculated as of the Acceptance Time, in each case,
net to the seller in cash, without interest thereon and less any applicable withholding taxes, upon the terms and conditions set forth in the offer to purchase and in the related letter of transmittal, copies of which were filed as Exhibit (a)(1)(A)
and Exhibit (a)(1)(B), respectively, to the Schedule 14D-9 filed by Horizon with the SEC on January 10, 2023 (together with any other related materials, as each may be amended or supplemented from time to
time, collectively constitute the Offer). Any capitalized term used and not otherwise defined herein shall have the meaning ascribed to such term in the Schedule 14D-9.
Subsequent Developments
Since the filing
of the Schedule 14D-9 on January 10, 2023, and as of January 27, 2023, four stockholder actions have been filed in federal courts in New York and Delaware by purported stockholders of Horizon in
connection with the transaction contemplated by the Offer: Stein v. Horizon Global Corporation, et al., Case No. 1:23-cv-288 (S.D.N.Y., filed January 12,
2023) (the Stein Action); Johnson v. Horizon Global Corporation, et al., Case No. 1:23-cv-00392 (S.D.N.Y., filed January 17, 2023) (the
Johnson Action); Smith v. Horizon Global Corporation, et al., Case No. 1:23-cv-00061 (D.Del., filed January 19, 2023) (the Smith
Action); and Thompson v. Horizon Global Corporation, et al., Case No. 1:23-cv-00500 (SD.N.Y., filed January 20, 2023) (the Thompson Action,
and together with the Stein Action, the Johnson Action and the Smith Action, the Horizon Stockholder Actions). Each of the Horizon Stockholder Actions names Horizon and its directors as defendants and alleges, among other things, that
certain public disclosures made by Horizon in the Schedule 14D-9 concerning the Offer are false and misleading and/or omit material information concerning the transactions contemplated by the Offer and Merger
Agreement in violation of Sections 14(d), 14(e) and 20(a) of the Securities Exchange Act of 1934 (the Exchange Act) and Rule 14d-9 promulgated thereunder. Plaintiffs in the Horizon Stockholder
Actions, among other things, seek to enjoin the transactions contemplated by the Offer and Merger Agreement and an award of attorneys fees and expenses.
In addition to the Horizon Stockholder Actions, as of January 27, 2023, Horizon has received demand letters from stockholders (the
Demand Letters), which, like the complaints in the Horizon Stockholder Actions, contend that certain public disclosures made by Horizon in the Schedule 14D-9 concerning the Offer are false and
misleading and/or omit material information concerning the transactions contemplated by the Offer and Merger Agreement and demand, generally, that certain information allegedly omitted from the Schedule 14D-9
be disclosed.