Exhibit 99.1

GULF ISLAND

REPORTS THIRD QUARTER 2025 RESULTS

THE WOODLANDS, TX - Gulf Island Fabrication, Inc. (NASDAQ: GIFI) (“Gulf Island” or the “Company”), a leading steel fabricator and service provider to the industrial, energy and government sectors, today announced its results for the third quarter 2025.

THIRD QUARTER 2025 SUMMARY

See “Non-GAAP Measures” below for the Company’s definition of EBITDA and adjusted EBITDA and reconciliations of the relevant amounts to the most directly comparable GAAP measure. See “Pending Transaction with IES” below for discussion of the November 2025 agreement with IES Holdings, Inc.

MANAGEMENT COMMENTARY

“We delivered strong third-quarter results with revenue of $51.5 million and adjusted EBITDA of $2.5 million, despite softer trends in our services business, a decline in small-scale fabrication activity and anticipated losses from our recently acquired Englobal business,” stated Richard Heo, Gulf Island’s Chief Executive Officer.

“We have made meaningful progress toward our strategic goal of business diversification with our previous acquisition of Englobal and growing focus on markets outside of oil and gas, such as infrastructure and government services. We believe our contract supporting the rebuild of the Francis Scott Key Bridge directly demonstrates the success of this strategy and highlights our competitive advantages in various end markets. We are also encouraged by the progress of the ongoing integration of Englobal, including our recent award with the U.S. Defense Logistics Agency, which underscores the benefits of this acquisition.”

“We have built a strong, more diversified business with a stable foundation in services and small-scale fabrication, complemented by attractive growth platforms in large fabrication and the Englobal business. I am proud of the progress we have made on our strategic transformation and the strong platform that we have created, which would not have been possible without the hard work and dedication of our employees across the organization,” concluded Heo.

RESULTS FOR THIRD QUARTER 2025

Consolidated – Revenue for the third quarter 2025 was $51.5 million, compared to $37.6 million for the prior year period. Net income for the third quarter 2025 was $1.6 million, compared to $2.3 million for the third quarter 2024. Adjusted EBITDA for the third quarter 2025 was $2.5 million, compared to $2.9 million for the prior year period. Adjusted EBITDA for the third quarter 2025 excludes integration costs of $0.1 million associated with the Englobal Acquisition, but includes operating losses of $1.0 million associated with the Englobal Business. See “Non-GAAP Measures” below for the Company’s definition of adjusted EBITDA and a reconciliation of consolidated net income to adjusted EBITDA.

Services Division – Revenue for the third quarter 2025 was $21.5 million, an increase of $1.2 million, or 6.2%, compared to the third quarter 2024, primarily due to the Englobal government services business.

Operating income was $0.8 million for the third quarter 2025, compared to $1.4 million for the third quarter 2024. EBITDA for the third quarter 2025 was $1.3 million (or 6.0% of revenue), down from $1.9 million (or 9.3% of revenue) for the prior year period. The decrease was primarily due to operating losses of $0.4 million resulting from the underutilization of resources for the Englobal engineering business and a less favorable project margin mix, offset partially by higher revenue. See “Non-GAAP Measures” below for the Company’s definition of EBITDA and a reconciliation of the Services division’s operating income to EBITDA.

Fabrication Division – Revenue for the third quarter 2025 was $30.6 million, an increase of $13.4 million, or 78.6%, compared to the third quarter 2024, primarily due to the division’s large structural steel components project (primarily related to procurement activities) and the Englobal automation business, offset partially by lower small-scale fabrication activity.

Operating income was $2.1 million for the third quarter 2025, compared to $2.0 million for the third quarter 2024. EBITDA for the third quarter 2025 was $2.9 million, up from $2.7 million for the prior year period. The increase was primarily due to higher revenue and a more favorable project margin mix for small-scale fabrication work, offset partially by lower utilization of facilities and resources, including operating losses of $0.6 million resulting from the underutilization of resources for the Englobal automation business. See “Non-GAAP Measures” below for the Company’s definition of EBITDA and a reconciliation of the Fabrication division’s operating income to EBITDA.

Corporate Division – Operating loss was $1.8 million for each of the third quarter 2025 and third quarter 2024. Adjusted EBITDA for each of the third quarter 2025 and third quarter 2024 was a loss of $1.7 million. Adjusted EBITDA for the third quarter 2025 excludes integration costs of $0.1 million associated with the Englobal Acquisition. See “Non-GAAP Measures” below for the Company’s definition of adjusted EBITDA and a reconciliation of the Corporate division’s operating loss to adjusted EBITDA.

BALANCE SHEET AND LIQUIDITY

The Company’s cash and short-term investments balance at September 30, 2025 was $64.6 million, including $1.2 million of restricted cash associated with outstanding letters of credit. At September 30, 2025, the Company had total debt of $19.0 million, bearing interest at a fixed rate of 3.0% per annum, with annual principal and interest payments of approximately $1.7 million through December 2038. The estimated fair value of the debt was $13.3 million at September 30, 2025, based on an estimated market rate of interest.

During the third quarter 2025, the Company repurchased 42,761 shares of its common stock for $0.3 million (average price per share of $6.75) under its share repurchase program. In accordance with certain restrictive covenants in the Merger Agreement (as defined below), the Company has suspended activity under its share repurchase program and does not intend to make further repurchases.

ENGLOBAL ACQUISITION

During the second quarter 2025, the Company acquired certain assets (the “Englobal Acquisition”) of ENGlobal Corporation’s (“Englobal”) automation, engineering and government services businesses (“Englobal Business”). Post-acquisition operating results of the automation business are reflected within the Fabrication division and post-acquisition operating results of the engineering and government businesses are reflected within the Services division. During the second and third quarters of 2025, the Englobal Business incurred operating losses of $0.5 million and $1.0 million, respectively, and the Company believes additional operating losses of approximately $1.0 million may be incurred during the fourth quarter 2025 as the business continues to transition out of bankruptcy. These expectations are consistent with the Company’s previous projections for the Englobal Business.

PENDING TRANSACTION WITH IES

As previously announced, on November 7, 2025, the Company entered into a definitive agreement (the “Merger Agreement”) with IES Holdings, Inc. (“IES”), providing for the acquisition of the Company by IES (the “Pending Transaction”). Under the terms of the Merger Agreement, if the Pending Transaction is completed, the Company’s shareholders will receive $12.00 per share in cash. The Pending Transaction was approved by the Company’s board of directors and is currently expected to close in the first quarter of 2026, subject to customary closing conditions, including approval by the Company’s shareholders and the receipt of required regulatory approvals.

SUSPENSION OF QUARTERLY CONFERENCE CALL DUE TO THE PENDING TRANSACTION

In light of the Pending Transaction, Gulf Island will not hold a conference call to discuss the Company’s financial results for the third quarter 2025.

ABOUT GULF ISLAND

Gulf Island is a leading fabricator of complex steel structures, modules and automation systems, and a provider of specialty services, including engineering, project management, commissioning, repair, maintenance, scaffolding, coatings, welding enclosures, cleaning and environmental, and technical field services to the industrial, energy and government sectors. The Company’s customers include U.S. and, to a lesser extent, international energy producers; refining, petrochemical, LNG, industrial and power operators; EPC companies; and federal, state and local governments. The Company is headquartered in The Woodlands, Texas and its primary operating facilities are located in Houma, Louisiana and Houston, Texas.

NON-GAAP MEASURES

This release includes certain measures, which are not recognized under U.S. generally accepted accounting principles (“GAAP”), including earnings before interest, taxes, depreciation and amortization (“EBITDA”), adjusted EBITDA, adjusted revenue, adjusted gross profit and new project awards. The Company believes EBITDA is a useful supplemental measure as it reflects the Company’s operating results and expectations of future performance excluding the non-cash impacts of depreciation and amortization. The Company believes adjusted EBITDA is a useful supplemental measure as it reflects the Company’s EBITDA adjusted to remove certain nonrecurring items (including transaction, integration and related costs associated with the Englobal Acquisition and a gain from the sale of excess property) and the operating results for the Company’s former Shipyard division (the wind down of which was completed in the first quarter 2025). The Company believes adjusted revenue and adjusted gross profit are useful supplemental measures as they reflect the Company’s revenue and gross profit adjusted to remove revenue and gross profit for the Company’s former Shipyard division (the wind down of which was completed in the first quarter 2025). Reconciliations of these non-GAAP measures, including EBITDA, adjusted EBITDA, adjusted revenue and adjusted gross profit to the most directly comparable GAAP measures are presented under “Consolidated Results of Operations” and “Results of Operations by Division” below.

The Company believes new project awards is a useful supplemental measure as it represents work that the Company is obligated to perform under its current contracts. New project awards represents the expected revenue value of new contract commitments received during a given period, including scope growth on existing contract commitments.

Non-GAAP measures are not intended to be replacements or alternatives to GAAP measures, and investors are urged to consider these non-GAAP measures in addition to, and not in substitution for, measures prepared in accordance with GAAP. The Company may present or calculate non-GAAP measures differently from other companies.

CAUTIONARY STATEMENT

This release contains forward-looking statements in which the Company discusses its potential future performance, operations and projects. 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 consummation of the Pending Transaction; the realization of the expected benefits of the Pending Transaction; operating results; diversification and entry into new end markets; the Company’s integration of the Englobal Business into its existing operations and realization of the anticipated benefits of the Englobal Acquisition; industry outlook; oil and gas prices; timing of investment decisions and new project awards; cash flows and cash balance; capital expenditures; tax rates; implementation of the Company’s share repurchase program and any other return of capital to shareholders; liquidity; and execution of strategic initiatives. The words “anticipates,” “appear,” “may,” “can,” “plans,” “believes,” “estimates,” “expects,” “projects,” “targets,” “intends,” “likely,” “will,” “should,” “to be,” “proposed,” “potential” and any similar expressions are intended to identify those assertions as forward-looking statements.

The Company cautions readers 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 its 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 Pending Transaction or Company Change in Recommendation (as defined in the Merger Agreement); the inability to complete the Pending Transaction due to the failure to obtain the shareholder approval necessary for the Pending Transaction; the failure to obtain, delays in obtaining, or adverse conditions contained in any required regulatory or other approvals for consummation of the Pending Transaction or the failure to satisfy other conditions to completion of the Pending Transaction; the failure of the Pending Transaction to close for any other reason, including due to a Company Material Adverse Effect (as defined in the Merger Agreement); risks related to disruption of management’s attention from the Company’s ongoing business operations due to the Pending 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, the Pending Transaction or otherwise; the risk that the pendency of the Pending Transaction disrupts current plans and operations and the potential difficulties in employee retention as a result of the pendency of the Pending Transaction; the effect of the announcement of the Pending Transaction on the Company’s relationships with its contractual counterparties, including customers, operating results and business generally; the amount of the costs, fees, expenses and charges related to the Pending Transaction; the Company’s ability to successfully integrate the Englobal Business into its existing operations and realize the anticipated benefits of the Englobal Acquisition; changes in trade policies of the U.S. and other countries, including tariffs and related market uncertainties; modifications, delays or terminations of the Company’s contracts with government entities or customers subject to government funding, including due to government funding limitations or any disruptions from a government shutdown; and other factors described under “Risk Factors” in Part I, Item 1A of the Company’s annual report on Form 10-K for the year ended December 31, 2024, as updated by the Company’s subsequent filings with the SEC.

Additional factors or risks that the Company currently deems immaterial, that are not presently known to the Company or that arise in the future could also cause the Company’s actual results to differ materially from its expected results. Given these uncertainties, investors are cautioned that many of the assumptions upon which the Company’s forward-looking statements are based are likely to change after the date the forward-looking statements are made, which it cannot control. Further, the Company may make changes to its business plans that could affect its results. The Company cautions investors that it undertakes 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 its assumptions, changes in business plans, actual experience or other changes.

COMPANY INFORMATION

Consolidated Results of Operations (in thousands, except per share data)

Consolidated Adjusted Revenue(1) Reconciliation (in thousands)

Consolidated Adjusted Gross Profit(1) Reconciliation (in thousands)

Consolidated EBITDA and Adjusted EBITDA(1) Reconciliations (in thousands)

Results of Operations by Division (including Reconciliations of EBITDA and Adjusted EBITDA) (in thousands)

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Consolidated Balance Sheets (in thousands)

Consolidated Cash Flows (in thousands)