Company: OC
Filing Date: 2025-04-03
Form Type: POSASR
Source: 0001370946-25-000135
Chunk: 1

Company: Owens Corning
Filing Date: 2025-04-03
Form: POSASR
Chunk 1
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 Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

### EXPLANATORY NOTE

### DEREGISTRATION OF SECURITIES
This Post-Effective Amendment No. 1 relates to the Registration Statement on Form S-3 (Registration No. 333-275165) (the “2023 Registration Statement”) filed by Owens Corning, a Delaware corporation (the “Company”), which was originally filed with the Securities and Exchange Commission on October 25, 2023.

On May 28, 2024, the Company filed a new Registration Statement on Form S-3 (Registration No. 333-279742) (the “2024 Registration Statement”).

As a result of the filing of the 2024 Registration Statement, the Company has terminated all offerings of its securities pursuant to the 2023 Registration Statement. In accordance with an