| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Doerfler Mari | Vice President and Controller | ONE OWENS CORNING PARKWAY, TOLEDO | /s/ Katherine M. Serevitch, Attorney-in-Fact | 14 Aug 2025 | 0001957375 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | OC | $.01 Par Value Common | Sale | $65,709 | -441 | -7.8% | $149.00 | 5,239 | 12 Aug 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | The total amount of holdings reflects an acquisition on May 30, 2025 of 122 shares through the Issuer's Employee Stock Purchase Plan which is exempt under Rule 16b-3(c). |