Company: LPX
Filing Date: 2025-12-12
Form Type: 10-Q/A
Source: 0000060519-25-000039
Chunk: 1

Company: LOUISIANA-PACIFIC CORP
Filing Date: 2025-12-12
Form: 10-Q/A
Chunk 1
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 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 |     | x |     | Accelerated filer         |     | o |
| Non-accelerated filer   |     | o |     | 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 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: 69,643,461shares of common stock, $1 par value per share, outstanding as of November 3, 2025.

### EXPLANATORY NOTE
This Amendment No. 1 on Form 10-Q/A (this “Amendment”) amends the Quarterly Report on Form 10-Q for the quarter ended September 30, 2025 originally filed by Louisiana-Pacific Corporation, a Delaware corporation (“we,” “our,” “us” or the “Company”), with the Securities and Exchange Commission (“SEC”) on November 5, 2025 (the “Original Filing”). We are filing this Amendment solely to (a) amend Item 5 of Part II of the Original Filing to include information concerning a Rule 10b5-1 trading arrangement adopted by our Chief Executive Officer on August 27, 2025 that was inadvertently omitted from the Original Filing and (b) amend Item 6 of Part II of the Original Filing to include (i) new certifications of our Chief Executive Officer and Chief Financial Officer, as Exhibits 31.1 and 31.2, pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K,