Owens Corning reports Q3 2026 results

Item 2.02 Results of Operations and Financial Condition

On November 4, 2026, Owens Corning (the "Company") issued a press release announcing its financial results for the quarter ended September 30, 2026.¹

Exhibit 99.1 contains certain financial measures that are considered "non-GAAP financial measures" as defined in the federal securities laws and contains an explanation and, as applicable, a reconciliation of these non-GAAP financial measures to their most directly comparable financial measures calculated and presented in accordance with accounting principles generally accepted in the United States.

The information in Item 2.02 of this Current Report is being furnished pursuant to General Instructions B.2 of Form 8-K and shall not be deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended², or otherwise subject to the liabilities of that Section. The information in Item 2.02 of this Current Report shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits.

Exhibit No. Description

99.1 Press Release, dated November 4, 2026

104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Owens Corning

November 4, 2026 By: /s/ Jonathan M. Collins

Jonathan M. Collins

Executive Vice President, Chief Financial Officer

(Principal Financial Officer)

Owens Corning Announces Third-Quarter 2026 Results

TOLEDO, Ohio – November 4, 2026 - Owens Corning (NYSE: OC), a branded building products leader, today reported third-quarter 2026 results.

• Reported Net Sales of $2.5 Billion , a 7% Decrease from Prior Year³

• Generated Net Earnings Margin of (10)% and Adjusted EBITDA Margin of 20%

• Delivered Diluted EPS of $(3.15) and Adjusted Diluted EPS of $2.44, which excludes the impact of Non-Cash, Pre-Tax Impairment Charges of $476 Million related to the Doors Business⁴

• Produced Operating Cash Flow of $813 Million and Free Cash Flow of $622 Million⁵

• Returned $337 Million to Shareholders through Dividends and Share Repurchases; Reduced Debt by $299 Million

"During the quarter, challenging residential market conditions were further impacted by a second consecutive year of weak storm activity and rapidly rising transportation and input material costs. Despite these pressures, our team demonstrated disciplined commercial and operational execution, delivering a resilient margin and strong cash flow," said Chair and Chief Executive Officer Brian Chambers. "Our performance reflects the fundamentally stronger company we have built, and we remain focused on executing our strategy and leveraging our unique OC Advantages TM to create additional long-term value for our customers and shareholders."

Enterprise Performance from Continuing Operations⁷

($ in millions, except per share amounts)⁷ Third-Quarter

Nine Months

Operating Cash Flow 1

813 918 1,057 1,196

Free Cash Flow 1

622 752 434 629

1 Reflects full company performance inclusive of discontinued operations.

Enterprise Highlights

• Owens Corning maintained a high level of safety performance with a recordable incident rate (RIR) of 0.81.

• Todd Fister was promoted to President and Chief Operating Officer, leading efforts to unlock efficiencies, strengthen execution, and accelerate organic growth across the enterprise. Jonathan Collins joined Owens Corning in August as Executive Vice President and Chief Financial Officer, succeeding Fister and bringing deep financial leadership experience and a proven background in scaling rapidly evolving businesses.

• Owens Corning placed second on the 100 Best Corporate Citizens list, marking the company's ninth consecutive year among the top 10. The list recognizes outstanding corporate responsibility performance among the largest publicly traded companies in the U.S.

Cash Returned to Shareholders

• In the third quarter, Owens Corning returned $337 million to shareholders.^{6 6}The company repurchased 1.9 million shares of common stock for $275 million and paid a quarterly cash dividend of $62 million.^{6 6}The company also reduced debt by $299 million⁶ and maintained net leverage within the targeted range of 2x to 3x.

"I am excited to partner with Brian and the leadership team as we build on Owens Corning's strong foundation and invest in the long-term growth of the company," said Executive Vice President and Chief Financial Officer Jonathan Collins. "In the third quarter, we continued to demonstrate our ability to generate attractive cash flow and returned significant capital to shareholders. Looking ahead, our financial approach remains grounded in disciplined capital allocation, maintaining a strong balance sheet, and preserving the financial flexibility to advance our strategic priorities."

Third-Quarter Business Performance

• The company continued to deliver resilient margin performance. For the third quarter, Owens Corning generated an enterprise adjusted EBITDA margin of 20%.

Segment Results ($ in millions) Net Sales EBITDA EBITDA Margin

Fourth-Quarter Outlook

• The key economic factors that impact the company's business are residential repair activity, residential remodeling activity, U.S. housing starts, and commercial construction activity.

• Owens Corning expects existing home sales, discretionary remodeling activity, and residential new construction to remain under pressure. In Roofing, a second consecutive year without significant storm activity and related distribution destocking are expected to weigh on near-term demand. Non-residential construction in North America is expected to continue to show pockets of strength, and conditions in the company's core European markets are anticipated to remain stable.

• Owens Corning anticipates significant input and delivery cost inflation to result in incremental expense, with minimal price expectations in the quarter.

• For the fourth-quarter 2026, Owens Corning expects revenue of $2.0 billion to $2.2 billion.^{8 8}The company expects to generate an enterprise adjusted EBITDA margin of approximately 10% to 12%.⁸ This reflects the impacts of significantly higher inflation and transportation cost increases, as well as fourth-quarter seasonality and incremental downtime due to weaker market volumes.

"While we are navigating a challenging market in the nea