X0609 4 2026-05-09 0000106535 WEYERHAEUSER CO WY 0001183850 PIASECKI NICOLE WEYERHAEUSER false 2000 WELLS FARGO PLACE 30 EAST 7TH STREET SAINT PAUL MN 55101-4930 true false false false false Common 2026-05-09 4 F false 106.34 23.53 D 12840 D Common 784 I Shares held by my spouse These shares are being withheld to cover taxes for a restricted stock unit vesting. Reported holdings include shares acquired since the Reporting Person's last filing on Form 4 from dividend reinvestment transactions exempt from Section 16 of the Securities Exchange Act of 1934, as amended, and reflect a cash payment in lieu of fractional shares upon the restricted stock unit vesting. /s/ Jason K Mitchell, Attorney-in-fact for Nicole Weyerhaeuser Piasecki 2026-05-12