On the Closing Date, the Company notified the New York Stock Exchange (the “NYSE”) of the consummation of the Merger and that each share of the Company Stock issued and outstanding immediately prior to the Effective Time (subject to certain customary exceptions specified in the Merger Agreement) had been converted into the right to receive the Merger Consideration. The Company requested that the NYSE (i) halt trading of the Company Stock on the NYSE prior to the opening of trading on the Clos…

As a result of the consummation of the Merger, at the Effective Time, holders of Company Stock (subject to certain customary exceptions specified in the Merger Agreement) immediately prior to such time ceased to have any rights as stockholders of the Company, other than their right to receive the Merger Consideration pursuant to the terms of the Merger Agreement.

Termination of Credit Facilities In connection with the consummation of the Merger on the Closing Date, the Company terminated all commitments outstanding under its credit facilities and repaid in full all obligations outstanding thereunder, including all amounts required to be paid in connection with such termination and repayment, and all liens and security interests securing such obligations and all guarantees of such obligations were released and terminated. The credit facilities consiste…

Pursuant to the Merger Agreement, each share of the Company's common stock, par value $0.01 per share (the “Company Stock”), issued and outstanding immediately prior to the effective time of the Merger (the “Effective Time”) (subject to certain customary exceptions specified in the Merger Agreement) was converted into the right to receive $95.00 in cash, without interest (the “Merger Consideration”). Also at the Effective Time: • Each option to purchase shares of Company Stock (a “Company Opt…

As a result of the consummation of the Merger, at the Effective Time, a change in control of the Company occurred and the Company became a wholly owned subsidiary of Buyer. The aggregate amount of cash payable as Merger Consideration by Buyer in connection with the Merger is approximately $3.3 billion, funded by a combination of equity financing and debt financing.

CEO — Andrea Pirondini: The filing describes a complete change in the board and officer roster resulting from a merger, which is a structural corporate event rather than a routine departure or promotion.

Regulation FD Disclosure On October 8, 2026, Atkore Inc. (the “Company”) gave conditional notice of redemption pursuant to the Indenture, dated as of May 26, 2021 (the “Indenture”), among the Company, the guarantors from time to time party thereto and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), that the Company has elected to redeem on the Redemption Date (as defined below) all outstanding notes under the Indenture, consisting of $400,000,000 aggregate princip…

Other Events. As previously reported, on August 2, 2026, Atkore Inc., a Delaware corporation (“Atkore” or the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among the Company, Prysmian S.p.A., a company organized under the laws of the Republic of Italy (“Buyer”), Trinity Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Buyer (“Merger Sub”), and, solely as provided in certain sections of the Merger Agreement, Prysmian Cables an…

and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of such section, and shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act. Additional Information and Where to Find It This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any…

of this Current Report on Form 8-K, including Exhibits 99.1 attached hereto, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 ("Exchange Act"), as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. SIGNATURES Pursuant to the…

Entry into a Material Definitive Agreement. Merger Agreement On August 2, 2026, Atkore Inc., a Delaware corporation (“Atkore” or the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Prysmian S.p.A., a company organized under the laws of the Republic of Italy (“Buyer”), Trinity Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Buyer (“Merger Sub”), and, solely as provided in certain sections of the Merger Agreement, Prysmian Cables…

Entry into a Material Definitive Agreement. As previously reported, multiple putative class action lawsuits were filed in 2024 and 2025 against Atkore Inc. and one or more of its subsidiaries (together, the "Company") and several other manufacturers of extruded PVC pipe and conduit products. In September 2024, those cases were centralized in the U.S. District Court for the Northern District of Illinois (the "Court") in a case captioned In re PVC Pipe Antitrust Litigation (the "Class Action Li…

Results of Operations and Financial Condition.* On May 5, 2026, Atkore International Group Inc. (the "Company" or "Atkore") issued a press release announcing the Company’s financial results for its fiscal 2026 second quarter ended March 27, 2026. A copy of the press release is being furnished as Exhibit 99.1 and incorporated herein by reference.

Entry into a Material Definitive Agreement. As previously reported, multiple putative class action lawsuits were filed in 2024 and 2025 against Atkore Inc. and one or more of its subsidiaries (together, the "Company") and several other manufacturers of extruded PVC pipe and conduit products. In September 2024, those cases were centralized in the U.S. District Court for the Northern District of Illinois (the "Court") in a case captioned In re PVC Pipe Antitrust Litigation (the "Class Action Li…

Results of Operations and Financial Condition.* On February 3, 2026, Atkore International Group Inc. (the "Company" or "Atkore") issued a press release announcing the Company’s financial results for its fiscal 2026 first quarter ended December 26, 2025. A copy of the press release is being furnished as Exhibit 99.1 and incorporated herein by reference.

Director — Franklin S. Edmonds, Jr.: Franklin S. Edmonds, Jr. was appointed to the Board of Directors and Strategic Review Committee as part of a cooperation agreement.

Entry into a Material Definitive Agreement. On November 20, 2025, Atkore Inc. (the “Company”) announced that it has entered into a cooperation agreement (the “Cooperation Agreement”) with Irenic Capital Management LP and certain of its affiliates (collectively, “Irenic”). Pursuant to the Cooperation Agreement, the Company has agreed to, among other things: (i) increase the size of the Company’s Board of Directors (the “Board”) by one (1) director and appoint Franklin S. Edmonds, Jr. (the “New…

Results of Operations and Financial Condition.* On November 20, 2025, Atkore Inc. (the "Company" or "Atkore") issued a press release announcing the Company’s financial results for the fourth fiscal quarter and year ended September 30, 2025. A copy of the press release is being furnished as Exhibit 99.1 and incorporated herein by reference.

Costs Associated with Exit or Disposal Activities. On September 29, 2025, Atkore Inc. (the "Company") announced its plan to cease manufacturing operations at three facilities in order to reduce costs. The Company intends to stop production at each of these facilities by approximately the end of the second quarter of fiscal 2026. As a result of the foregoing plan, the Company expects to incur pre-tax cash charges of between $5 and $15 million, which consist of employee-related costs and other…

Entry into a Material Definitive Agreement On September 29, 2025, Atkore International, Inc. (“ AII ”), a wholly owned subsidiary of Atkore Inc. (the “ Company ”), entered into a new $373 million senior secured term loan facility (the “ New Senior Secured Term Loan Facility ”) pursuant to an amendment to its existing Term Loan Credit Agreement (the “ Amendment ”). The New Senior Secured Term Loan Facility will mature on the earlier of (i) September 29, 2032 and (ii) the date that is 91 days p…

Creation of a Direct Financial Obligation or an Obligation under Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Results of Operations and Financial Condition.* On August 5, 2025, Atkore International Group Inc. (the "Company" or "Atkore") issued a press release announcing the Company’s financial results for its fiscal 2025 third quarter ended June 27, 2025. A copy of the press release is being furnished as Exhibit 99.1 and incorporated herein by reference.

President and CEO — William E. Waltz, Jr.: William E. Waltz, Jr., the President and CEO, plans to retire but will continue until a successor is appointed.

Results of Operations and Financial Condition.* On May 6, 2025, Atkore International Group Inc. (the "Company" or "Atkore") issued a press release announcing the Company’s financial results for its fiscal 2025 second quarter ended March 28, 2025. A copy of the press release is being furnished as Exhibit 99.1 and incorporated herein by reference.

Entry into a Material Definitive Agreement. Credit Agreement Amendment On April 30, 2025, Atkore International, Inc. (“ Atkore Borrower ”), a wholly owned subsidiary of Atkore Inc., entered into a Fourth Amendment (the “ Fourth Amendment ”) to its existing Credit Agreement, dated as of August 28, 2020 (the “ Existing Credit Agreement ”; and the Existing Credit Agreement as amended by the Fourth Amendment, the “ Credit Agreement ”), by and among Atkore Borrower, the subsidiary borrowers from t…