Company: OC
Filing Date: 2025-03-14
Form Type: DEF 14A
Source: 0001370946-25-000125
Chunk: 1

Company: Owens Corning
Filing Date: 2025-03-14
Form: DEF 14A
Chunk 1
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 Meeting of Stockholders (the “Annual Meeting”) virtually because hosting a virtual Annual Meeting enables greater stockholder attendance and participation from any location around the world, improves meeting efficiency and our ability to communicate effectively with our stockholders, provides for cost savings to Owens Corning and our stockholders, and reduces the environmental impact of our Annual Meeting. You will not be able to attend the Annual Meeting physically in person.

We are providing these proxy materials in connection with the solicitation by the Board of Directors (the “Board”) on behalf of Owens Corning, of proxies to be voted at the Annual Meeting and at any adjournment or postponement thereof. On or about March 14, 2025, these proxy materials are being distributed to stockholders. Only stockholders who are eligible to vote at the Annual Meeting will be admitted. Stockholders holding shares at the close of business on the record date of February 18, 2025 may attend the Annual Meeting. You will be able to attend the Annual Meeting, vote, and submit your questions in advance of the meeting by visiting www.virtualshareholdermeeting.com/OC2025 . To participate in the Annual Meeting, you must have your sixteen-digit control number that is shown on your proxy card or your voting instruction form.

### HELP US REDUCE PRINTING AND MAILING COSTS
If you share the same last name with other stockholders living in your household, you may receive only one copy of our Notice of Annual Meeting of Stockholders and Proxy Statement and accompanying documents. Please see the response to the question “What is ‘householding’ and how does it affect me?” in the Questions and Answers About the Annual Meeting and Voting section for more information on this stockholder program that eliminates duplicate mailings.

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

OWENS CORNING

One Owens Corning Parkway

Toledo, Ohio 43659

#### Notice of Annual Meeting of Stockholders
| TIME AND DATE: 
 PLACE:         |     | 9:00 a.m. Eastern Time on Tuesday, April 15, 2025                                                                                                                                                                                                                                                                                       
 Virtual Annual Meeting webcast atwww.virtualshareholdermeeting.com/OC2025                                                                                                                                                                                                                                                               |
|:---------------|:----|:----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| PURPOSE:       |     | 1.To elect the ten director nominees listed in the accompanying Proxy Statement.                                                                                                                                                                                                                                                        
 2.To ratify the selection of PricewaterhouseCoopers LLP as our independent