Company: OC
Filing Date: 2025-03-14
Form Type: DEF 14A
Source: 0001370946-25-000125
Chunk: 3

Company: Owens Corning
Filing Date: 2025-03-14
Form: DEF 14A
Chunk 3
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 innovative products and sustainable solutions deliver a material difference to customers and, ultimately, make the world a better place.

Owens Corning’s market-leading positions and unique capabilities contribute to delivering substantial free cash flow and significant stockholder value. The business has a focused geographic footprint in North America and Europe and our business includes approximately 25,000 employees focused on generating value for our customers and making a difference in the communities where they work and live. Founded in 1938 and based in Toledo, Ohio, Owens Corning posted net sales in 2024 of $11.0 billion.

| Business Segments                   |     |                |     |               |
| CORE BUILDING PRODUCTS REVENUE MIX: |     |                |     |               |
| BY SEGMENT1                         |     | BY END MARKET1 |     | BY GEOGRAPHY1 |

1 Management estimates. Excludes the Company’s global glass reinforcements business and the building materials business in China and Korea, as the Company has entered into agreements to sell both businesses. Estimated error margin +/- 5%.

1

T a b l e o f C o n t e n t s

#### PROPOSAL 1

### ELECTION OF DIRECTORS

### INFORMATION CONCERNING DIRECTORS
Currently, the Board of Directors (the “Board”) of the Company consists of eleven directors whose terms expire at the 2025 Annual Meeting of Stockholders (the “Annual Meeting”). Our Board has nominated ten directors for re-election at the Annual Meeting, including Michelle T. Collins, who was elected to the Board in December 2024. Prior to Ms. Collins joining the Board, she was identified by a third-party search firm and recommended to the Governance and Nominating Committee as a potential director. One of our current directors, W. Howard Morris, advised the Board he will not stand for re-election at the Annual Meeting and, therefore, his term will end at the Annual Meeting. We thank Mr. Morris for his years of dedicated service and wish him continued success in the future.

### BOARD STRUCTURE
• The Board is fully declassified and all directors stand for re-election annually.

• The Company’s Fourth Amended and Restated Bylaws (as amended) (“Bylaws”) provide for majority voting in uncontested director elections, with a resignation requirement for directors not elected by a majority vote. Directors will be elected by a majority of votes cast at the Annual Meeting. Each person elected at the Annual Meeting will serve until the 2026 Annual Meeting