Additional Proxy Soliciting Materials (Form DEFA14A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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 7, 2025

Gulf Island Fabrication, Inc.

(Exact name of registrant as specified in its charter)

2170 Buckthorne Place, Suite 420

The Woodlands, Texas 77380

(Address of principal executive offices)(Zip Code)

(713) 714-6100

(Registrant's telephone number, including area code)

Not applicable

(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:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☒ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR § 240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01

Other Events.

On November 7, 2025, Gulf Island Fabrication, Inc. (the "Company") and IES Holdings, Inc. ("IES") issued a joint press release (the "Press Release") announcing the entry into an Agreement and Plan of Merger (the "Merger Agreement") that provides for, among other things and on the terms and subject to the conditions of the Merger Agreement, the merger of IES Merger Sub, LLC, a Louisiana limited liability company and an indirect wholly owned subsidiary of IES ("Merger Sub"), with and into the Company, with the Company surviving the merger as an indirect wholly owned subsidiary of IES. A copy of the Press Release is attached hereto as Exhibit 99.1.

Cautionary Statement on Forward-Looking Statements

The foregoing contains forward-looking statements. Forward-looking statements, within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, are all statements other than statements of historical facts, such as projections or expectations relating to the consummation of the proposed transaction and the realization of the anticipated benefits of the proposed transaction. The words "anticipates," "may," "can," "plans," "expects," "expected," "projects," "targets," "intends," "likely," "will," "should," "to be," "proposed," "potential" and any similar expressions are intended to identify those assertions as forward-looking statements.

We caution you that forward-looking statements are not guarantees of future performance and actual results may differ materially from those anticipated, projected or assumed in the forward-looking statements. Important factors that can cause our actual results to differ materially from those anticipated in the forward-looking statements include, but are not limited to: the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; the inability to complete the proposed transaction due to the failure to obtain the shareholder approval necessary for the proposed transaction; the failure to obtain, delays in obtaining, or adverse conditions contained in any required regulatory or other approvals for consummation of the proposed transaction or the failure to satisfy other conditions to completion of the proposed transaction; the failure of the proposed transaction to close for any other reason; risks related to disruption of management's attention from the Company's ongoing business operations due to the proposed transaction; the outcome of any legal proceedings, regulatory proceedings or enforcement matters that may be instituted against the Company and others relating to the merger agreement, proposed transaction or otherwise; the risk that the pendency of the proposed transaction disrupts current plans and operations and the potential difficulties in employee retention as a result of the pendency of the proposed transaction; the effect of the announcement of the proposed transaction on the Company's relationships with its contractual counterparties, including customers, operating results and business generally; and the amount of the costs, fees, expenses and charges related to the proposed transaction; and other factors described under the heading "Risk Factors" in Part I, Item 1A of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024, as updated by subsequent filings with the SEC.

Additional factors or risks that we currently deem immaterial, that are not presently known to us or that arise in the future could also cause our actual results to differ materially from our expected results. Given these uncertainties, investors are cautioned that many of the assumptions upon which our forward-looking statements are based are likely to change after the date the forward-looking statements are made, which we cannot control. Further, we may make changes to our plans that could affect our results. We caution investors that we undertake no obligation to publicly update or revise any forward-looking statements, which speak only as of the date made, for any reason, whether as a result of new information, future events or developments, changed circumstances, or otherwise, and notwithstanding any changes in our assumptions, changes in plans, actual experience or other changes.

Additional Information and Where to Find It

This communication may be deemed to be solicitation material in respect of the transaction between the Company, IES and Merger Sub. The Company expects to announce a special meeting of the Company's shareholders as soon as practicable to obtain shareholder approval of the proposed transaction. In connection with the transaction, the Company intends to file relevant materials with the SEC, including a proxy statement in preliminary and definitive form. YOU ARE URGED TO READ THE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE TRANSACTION AND THE PARTIES TO THE TRANSACTION. You may obtain a free copy of these materials (when they are available) and other documents filed by the Company with the SEC at the SEC's website at www.sec.gov, at the investor relations section of the Company's website located at https://ir.gulfisland.com/sec-filings/all-sec-filings, or by requesting copies from the Secretary of the Company at (713) 714-6100 or 2170 Buckthorne Place, Suite 420, The Woodlands, Texas, 77380.

Participants to Solicitation

The directors and executive officers of the Company, and other persons, may be deemed to be participants in the solicitation of proxies in respect of the transaction. Information regarding the Company's directors and executive officers is available in the Company's definitive proxy statement filed with the SEC on April 10, 2025 in connection with the Company's 2025 annual meeting of shareholders. This document can be obtained free of charge from the sources indicated above. Other information regarding persons who may be deemed participants in the solicitation of proxies and a description of their interests, by security holdings or otherwise, will be included in the proxy statement relating to the transaction (when available) and other relevant materials to be filed with the SEC.

(d) Exhibits

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.