(Mark One) OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto Commission File Number: 000-22462 GIBRALTAR INDUSTRIES, INC. (Exact name of registrant as specified in its charter) 16-1445150 (I.R.S. Employer Identification No.) (State or Other Jurisdiction of Incorporation or Organization) 14219-0228 (716)826-6500(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Name of each exchange on which registered ROCK The NASDAQ Stock Market LLC Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),and (2)has been subject to such filing requirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuantto Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrantwas required to submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reportingcompany,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. Acceleratedfiler☐Smaller reporting company☐Emerging growthcompany☐ Large accelerated filer☒Non-accelerated filer☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicated by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No☒ As of August3, 2026, the number of shares of common stock outstanding was: 29,683,889. GIBRALTAR INDUSTRIES, INC. INDEX PARTI.FINANCIAL INFORMATIONItem 1.Financial StatementsConsolidated Statements of Operations for the Three and Six Months Ended June 30, 2026 and 2025(unaudited)3Consolidated Statements of Comprehensive Income(Loss) for the Three and Six Months Ended June 30, 2026and 2025 (unaudited)4Consolidated Balance Sheets as of June 30, 2026 (unaudited) and December 31, 20255Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2026 and 2025 (unaudited)6Consolidated Statements of Stockholders’ Equity for the Three and Six Months Ended June 30, 2026 and 2025(unaudited)7Notes to Consolidated Financial Statements (unaudited)9Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations25Item 3.Quantitative and Qualitative Disclosures About Market Risk34Item 4.Controls and Procedures35PARTII.OTHER INFORMATIONItem 1.Legal Proceedings35Item 1A.Risk Factors35Item 2.Unregistered Sales of Equity Securities and Use of Proceeds36Item 3.Defaults Upon Senior Securities36Item 4.Mine Safety Disclosures36Item 5.Other Information36Item 6.Exhibits36SIGNATURES38 GIBRALTAR INDUSTRIES, INC.CONSOLIDATED STATEMENTS OF OPERATIONS(in thousands, except per share data)(unaudited) GIBRALTAR INDUSTRIES, INC.CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(in thousands)(unaudited) GIBRALTAR INDUSTRIES, INC.CONSOLIDATED BALANCE SHEETS(in thousands, except per share data) GIBRALTAR INDUSTRIES, INC.CONSOLIDATED STATEMENTS OF CASH FLOWS(in thousands)(unaudited) See accompanying notes to consolidated financial statements. GIBRALTAR INDUSTRIES, INC.NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(unaudited) (1)BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements of Gibraltar Industries, Inc. (the "Company") have beenpreparedby management in accordance with U.S.generally accepted accounting principles for interim financialinformation and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, alladjustments (consisting of normal recurring adjustments) considered necessary for the fair presentation of results for theinterim period have been included. The Company's operations are seasonal, for this and other reasons financial results forany interim period are not necessarily indicative of the results expected for any subsequent interim period or for the fullyear. The accompanying unaudited consolidated financial statements should be read in conjunction with the financialstatements and notes thereto included in the Company's annual report on Form 10-K for the year ended December31,2025. The consolidated balance sheet atDecember31, 2025has been derived from the audited financial statements at thatdate, but does not include all of the information and footnotes