of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On July 21, 2026, Armstrong World Industries, Inc. (the “Company”) issued a press release announcing that its Board of Directors has approved an additional $800 million authorization to repurchase shares under the Company’s existing share repurchase program, increasing the total authorized amount under the program to $2.5 billion, and extending the program through December 31, 2029. Pursuant to the program, the Company may purchase shares of its common stock at times and in such…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On April 24, 2026, Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.339 per share of outstanding common stock payable on May 26, 2026 to stockholders of record as of the close of business on May 11, 2026. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On February 19, 2026, Armstrong World Industries, Inc. (the “Company”) issued a press release announcing it has completed the acquisition of Eventscape, Inc. (“Eventscape”) headquartered in Toronto, Ontario, Canada with additional operations in New York City, New York. Eventscape is a leader in the design, fabrication and installation of custom ceilings, walls, facades and other architectural features made of a broad range of materials. AWI funded the transaction with existing ca…

Other Events On February 18, 2026 Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.339 per share of outstanding common stock payable on March 19, 2026 to stockholders of record as of the close of business on March 5, 2026. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

Senior Vice President, General Counsel, Head of Government Relations & Chief Sustainability Officer, Secretary — Austin K. So: Mr. So is leaving the company as part of a broader board and management transition.

CEO — Victor D. Grizzle: The CEO is transitioning to Executive Chair with a named internal successor (COO), indicating an orderly succession rather than a sudden loss of leadership.

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

Entry into a Material Definitive Agreement. On December 10, 2025 (the “Closing Date”), Armstrong World Industries, Inc. (“AWI”) entered into a first amendment to second amended and restated credit agreement (the “First Amendment”), by and among AWI, as the borrower, certain subsidiaries of AWI identified therein as guarantors, Bank of America, N.A., as the administrative agent, the collateral agent, a letter of credit issuer and the swing line lender, Citizens Bank, N.A., Manufacturers & Trad…

Termination of a Material Definitive Agreement. The information set forth in

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Director — Kevin P. Holleran: Appointment of Kevin P. Holleran as a new director to the Board.

Other Events On October 22, 2025 Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.339 per share of outstanding common stock payable on November 20, 2025 to stockholders of record as of the close of business on November 6, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

Other Events On September 18, 2025, Armstrong World Industries, Inc. ("AWI," or the "Company") issued a press release announcing it has completed the acquisition of Geometrik Manufacturing Inc. headquartered in Kelowna, British Columbia ("Geometrik"). Geometrik is a leading Canadian designer and manufacturer of wood acoustical ceiling and wall systems made from multiple wood species, including Western Hemlock. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated her…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On July 23, 2025 Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.308 per share of outstanding common stock payable on August 21, 2025 to stockholders of record as of the close of business on August 7, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On April 23, 2025 Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.308 per share of outstanding common stock payable on May 22, 2025 to stockholders of record as of the close of business on May 8, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

COO — Mark A. Hershey: The filing discloses the internal promotion of a long-tenured executive to the role of Chief Operating Officer, which is a standard succession or expansion event rather than a departure.

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…

Other Events On February 19, 2025 Armstrong World Industries, Inc. (the "Company") issued a press release announcing that its Board of Directors has declared a quarterly cash dividend of $0.308 per share of outstanding common stock payable on March 20, 2025 to stockholders of record as of the close of business on March 6, 2025. A copy of the press release is attached as Exhibit 99.1 hereto and incorporated herein by reference. Section 9 – Financial Statements and Exhibits

Other Events On December 4, 2024, Armstrong World Industries, Inc. ("AWI," or the "Company") issued a press release announcing it has completed the acquisition of A. Zahner Company, LLC headquartered in Kansas City, Missouri (“Zahner”). Zahner is a widely recognized leader in the design, engineering and fabrication of highly crafted, complex exterior architectural metal solutions. A pioneer in the use of metal in architecture, Zahner is renowned for its collaborative design and metal fabricat…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished herewith and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Sect…