Company: OC
Filing Date: 2025-03-14
Form Type: DEF 14A
Source: 0001370946-25-000125
Chunk: 29

Company: Owens Corning
Filing Date: 2025-03-14
Form: DEF 14A
Chunk 29
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 only after receiving approval from the Governance and Nominating Committee.

25

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

### BENEFICIAL OWNERSHIP OF SHARES
The information in the table below sets forth those persons (including any “group” as that term is used in Section 13(d)(3) of the Securities Exchange Act of 1934 (the “Exchange Act”) known by the Company to be the beneficial owners of more than 5% of the Company’s common stock as of February 18, 2025 (except as noted below). Beneficial ownership is determined in accordance with the rules of the SEC and, except as otherwise indicated by footnote, the number of shares and percentage ownership indicated in the following table is based on outstanding shares of the Company’s common stock as of February 18, 2025.

| NAME OF BENEFICIAL OWNER |     | BENEFICIAL OWNERSHIP |     |       | PERCENT OF CLASS |
| BlackRock, Inc.(1)       |     |           10,973,403 |     | 12.83 | %                |
| The Vanguard Group(2)    |     |            9,104,610 |     | 10.64 | %                |

(1) Based solely upon a Schedule 13G/A filed with the SEC on January 23, 2024, BlackRock, Inc., 50 Hudson Yards, New York, NY 10001, beneficially owned 10,973,403 shares of our common stock, with sole voting power over 10,140,170 shares and sole dispositive power over 10,973,403 shares as of December 31, 2023.

(2) Based solely upon a Schedule 13G/A filed with the SEC on February 13, 2024, The Vanguard Group, 100 Vanguard Blvd., Malvern, PA 19355, beneficially owned 9,104,610 shares of our common stock, with shared voting power over 58,881 shares, sole dispositive power over 8,973,237 shares and shared dispositive power over 131,373 shares as of December 29, 2023.

26

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

### SECURITY OWNERSHIP OF EXECUTIVE OFFICERS AND DIRECTORS
The following table contains information, as of February 18, 2025, unless otherwise indicated, about the