WY: Leadership change

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers Item 5.07: Submission of Matters to a Vote of Security Holders Item 9.01: Financial Statements and Exhibits Signatures EXHIBIT 10.1 Weyerhaeuser Company 2026 Deferred Compensation Plan EXHIBIT 104 Cover page interactive data file (embedded within the inline XBRL document). Table of Contents Section 5 – Corporate Governance and Management Item 5.02 . Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers (e) On May 14, 2026, the Weyerhaeuser Company ("Weyerhaeuser" or the "Company") amended and restated the Weyerhaeuser Company 2023 Deferred Compensation Plan. Pursuant to the plan, designated employee participants, including the company’s executive officers, may defer between 10 and 50 percent of base salary and between 10 and 100 percent of cash incentive awards for payment at a future date. Participants may defer base salary into an interest-bearing cash account and cash incentive awards into either an interest-bearing cash account or an account denominated in stock equivalents. Prior to the amendment and restatement of the plan, amounts deferred into stock equivalent accounts were credited with a premium determined each year by the Compensation Committee; the primary purpose of the amendment and restatement of the plan was to eliminate the premium for stock equivalent deferrals and related provisions. The amended and restated plan will govern deferrals and distributions of amounts earned in 2027 and subsequent years. The foregoing descriptions of the Deferred Compensation Plan are not intended to be complete and are qualified