Company: WFG
Filing Date: 2025-02-12
Form Type: 40-F
Source: 0001628280-25-005183
Chunk: 0

Company: WEST FRASER TIMBER CO., LTD
Filing Date: 2025-02-12
Form: 40-F
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### FORM 40-F
| o |     | REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934    |
|   |     | OR                                                                                      |
| x |     | ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

| For the fiscal year ended | December 31, 2024 |     | Commission File Number: | 001-39974 |

|                                                                   |     |                           WEST FRASER TIMBER CO. LTD. |     |                    |
|                                                                   |     | -Exact name of Registrant as specified in its charter |     |                    |
| British Columbia, Canada                                          |     |                                                  2421 |     | 98-1630330         |
| (Province or Other Jurisdiction of Incorporation or Organization) |     |      -Primary Standard Industrial Classification Code |     | -I.R.S. Employer   
 Identification No. |

#### 1500 – 885 West Georgia Street

#### Vancouver, British Columbia

#### Canada V6C 3E8

#### Tel: ( 604)

#### 895-2700
<div align='center'>(Address and telephone number of Registrant’s principal executive offices)</div>

#### West Fraser, Inc.

#### 57 Germantown Court, Suite 300

#### Cordova, TN 38018-4274

#### Tel: ( 901) 620-4200
<div align='center'>(Name, address (including zip code) and telephone number (including

area code) of agent for service in the United States)</div>

Securities registered or to be registered pursuant to section 12(b) of the Act:

| Title Of Each Class         |     | Trading Symbol(s) |     | Name Of Each Exchange On Which Registered |
| Common Shares, no par value |     | WFG               |     | New York Stock Exchange                   |

Securities registered or to be registered pursuant to Section 12(g) of the Act: None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

For annual reports, indicate by check mark the information filed with this Form:

| x |     | Annual Information Form |     | x |     | Aud