Company: OC
Filing Date: 2025-03-14
Form Type: DEF 14A
Source: 0001370946-25-000125
Chunk: 2

Company: Owens Corning
Filing Date: 2025-03-14
Form: DEF 14A
Chunk 2
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 registered public accounting firm for 2025.                                                                                                                                                                                                                  
 3.To approve, on an advisory basis, our named executive officer compensation.                                                                                                                                                                                                                                                           
 4.To transact such other business as may properly come before the Annual Meeting or any adjournment or postponement of the Annual Meeting.                                                                                                                                                                                              |
| RECORD DATE:   |     | You can vote if you were a stockholder of record at the close of business onFebruary 18, 2025.                                                                                                                                                                                                                                          |
| ANNUAL REPORT: |     | Our Annual Report for the Fiscal Year Ended December 31, 2024 (“2024 Annual Report”) is enclosed with these materials as a separate booklet.                                                                                                                                                                                            |
| PROXY VOTING:  |     | It is important that your shares be represented and voted at the Annual Meeting. You can vote your shares on the internet, by telephone, or by completing and returning your proxy or voting instruction card. See details under the heading “How do I vote?” in the Questions and Answers About the Annual Meeting and Voting section. |
|                |     | IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD APRIL 15, 2025: The Notice of Annual Meeting of Stockholders, Proxy Statement and 2024 Annual Report are available athttps://materials.proxyvote.com/690742andhttps://investor.owenscorning.com/proxy.                 |

By order of the Board of Directors,

Gina A. Beredo

Corporate Secretary

#### Toledo, Ohio

#### March 14, 2025
T a b l e o f C o n t e n t s

### TABLE OF CONTENTS
|                                                                                                                                 |     |    |     | Page |
| Company Overview                                                                                                                |     |  1 |     |      |
| Proposal 1. Election of Directors                                                                                               |     |  2 |     |      |
| Information Concerning Directors                                                                                                |     |  2 |     |      |
| Board Structure                                                                                                                 |     |  2 |     |      |
| Director Qualifications, Skills and Experience                                                                                  |     |  2 |     |      |
| Board of Directors Skill Matrix                                                                                                 |     |  3 |     |      |
| Director Biographical Information                                                                                               |     |  4 |     |      |
| Governance Information                                                                                                          |     | 14 |