Company: OC
Filing Date: 2025-03-14
Form Type: DEF 14A
Source: 0001370946-25-000125
Chunk: 0

Company: Owens Corning
Filing Date: 2025-03-14
Form: DEF 14A
Chunk 0
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T a b l e o f C o n t e n t s

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the
<div align='center'>Securities Exchange Act of 1934 (Amendment No. __)</div>

| Filed by the Registrant ☒ |     | Filed by a Party Other Than the Registrant ☐ |

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as Permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

#### Owens Corning
<div align='center'>(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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

#### NOTICE OF ANNUAL MEETING OF

### STOCKHOLDERS AND PROXY STATEMENT
Tuesday, April 15, 2025

9:00 a.m. Eastern Time

Virtual Meeting

webcast at www.virtualshareholdermeeting.com/OC2025

This proxy statement, the accompanying proxy card and our 2024 Annual Report will be made available on or about March 14, 2025 to stockholders of record as of February 18, 2025.

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

### HOW TO VOTE
Stockholders have a choice of voting on the internet, by telephone, or by mail using a traditional proxy card or voting instruction card. Please refer to the proxy card or other voting instructions included with these proxy materials for information on the voting methods available to you. If you vote on the internet or by telephone, you do not need to return your proxy card.

### VIRTUAL ANNUAL MEETING AND ADMISSION
We have decided to hold the 2025 Annual