Apogee Enterprises, Inc.

Item 1.01 Entry into a Material Definitive Agreement Share Purchase Agreement On September 2, 2026, Apogee Enterprises, Inc. (the “Company”) entered into a Share Purchase Agreement (the “Purchase Agreement”) with the sellers party thereto (collectively, the “Sellers”), pursuant to which the Company, through a newly formed, wholly owned subsidiary, agreed to acquire 100% of the issued and outstanding equity interests of SIA “Alzette”, a Latvian limited liability company (“Alzette”) (the “Transaction”). Alzette owns 100% of the equity interests of SIA “GroGlass” (“Groglass”), a Latvia-based provider of high-performance glass surface solutions specializing in anti-reflective and other advanced coating technologies. Under the terms of the Purchase Agreement, the Transaction values Groglass at approximately €62.5 million on a cash-free, debt-free basis; the final purchase price is subject to the adjustments set forth in the Purchase Agreement and is inclusive of a contingent payment described in the next sentence. A portion of the consideration may become payable following closing based upon the achievement of specified financial performance targets during the three-year period following closing. The maximum contingent consideration payable pursuant to the earnout provisions is €10 million. The Company intends to finance the cost of the Transaction with cash on hand and borrowings under its existing credit facility. The Purchase Agreement contains customary representations, warranties, covenants and closing conditions for a transaction of this nature. Closing of the Transaction is subject to the satisfaction or waiver of customary closing conditions and is expected to occur during the Company’s third quarter of fiscal 2027. In connection with the Transaction, the parties, certain of their affiliates and certain of Groglass’ employees will also enter into certain other ancillary agreements, including employment, consulting and restrictive covenant agreements. The foregoing description of the Purchase Agreement does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Purchase Agreement, a copy of which is filed as Exhibit 2.1 to this Current Report on Form 8-K (this “Current Report”) and is incorporated herein by reference. This summary of the principal terms of the Purchase Agreement and the copy of the Purchase Agreement filed as Exhibit 2.1 have been included to provide investors with information regarding its terms. It is not intended to provide any other factual information about the Company, the Sellers, Groglass, Alzette or any of their respective subsidiaries or affiliates. In particular, the assertions embodied in the representations and warranties contained in the Purchase Agreement are qualified by information in confidential disclosure schedules provided by the parties in connection with the signing of the Purchase Agreement. These confidential disclosure schedules contain information that modifies, qualifies and creates exceptions to the representations and warranties and certain covenants set forth in the Purchase Agreement. Moreover, the representations, warranties and covenants in the Purchase Agreement were made as of specific dates, were made solely for the Purchase Agreement and for the purposes of allocating risk between the parties to the Purchase Agreement, rather than establishing matters as facts, are solely for the benefit of such parties, may be subject to qualifications or limitations agreed upon by such parties and may be subject to standards of materiality applicable to such parties that differ from those generally applicable to investors and reports and documents filed with the U.S. Securities and Exchange Commission. Accordingly, investors are not third-party beneficiaries under the Purchase Agreement and the representations, warranties and covenants in the Purchase Agreement, and any descriptions thereof, should not be relied on as characterizations of the actual state of facts or circumstances of the Company, the Sellers, Groglass, Alzette or any of their respective subsidiaries or affiliates. Moreover, information concerning the subject matter of such representations, warranties and covenants may change after the date of the Purchase Agreement, which subsequent information may or may not be fully reflected in the parties’ public disclosures.

Item 7.01 Regulation FD Disclosure. On September 2, 2026, the Company issued a press release (the “Press Release”) regarding the matters described in Item 1.01 of the Current Report on Form 8-K, a copy of which is filed as Exhibit 99.1 and incorporated into this Item 7.01. The information furnished pursuant to this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that section, and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, unless specifically identified therein as being incorporated therein by reference. Forward-Looking Statements This Current Report contains “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. The words “believe,” “expect,” “anticipate,” “intend,” “estimate,” “forecast,” “project,” “should,” “will” and similar expressions are intended to identify “forward-looking statements”. These statements reflect Apogee management’s expectations or beliefs as of the date of this release. The Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. All forward-looking statements are qualified by factors that may affect the results, performance, financial condition, prospects and opportunities of the Company, including the following: (A) the risk of not closing the pending Transaction, or of not closing it on the expected timeline; (B) risks related to integration of the operations and business of Groglass into the Company following the closing of the Transaction; (C) the risk of not achieving projected cost synergies following the closing of the Transaction, or of not achieving them on the projected timeline; and (D) the risk of not achieving our expected revenue, margin and profitability targets in connection with the Transaction. The Company cautions investors that actual future results could differ materially from those described in the forward-looking statements and that other factors may in the future prove to be important in affecting the Company’s results, performance, prospects, or opportunities. New factors emerge from time to time, and it is not possible for management to predict all such factors, nor can it assess the impact of each factor on the business or the extent to which any factor, or a combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.