X0609 4/A 2026-05-15 2026-05-18 0 0000106535 WEYERHAEUSER CO WY 0001183850 PIASECKI NICOLE WEYERHAEUSER false 2000 WELLS FARGO PLACE 30 EAST 7TH STREET SAINT PAUL MN 55101-4930 1 0 0 0 0 Share equivalents 0 2026-05-15 4 A 0 7832 0 A Common 7832 93391.357 D The stock equivalents reported herein were acquired pursuant to the Issuer's Fee Deferral Plan for Directors. The Reporting Person elected to defer receipt of 7,832 restricted stock units into an equal number of stock equivalents. The restricted stock units (rounded down to the nearest whole unit) represent the equity portion of the annual retainer fee in the amount of $180,000, with the number of units determined by dividing the dollar amount of the fee by $22.98, the average of the high ($23.40) and low ($22.56) price of the Issuer's common stock on the date of the grant. Additional stock equivalents accrue as and when dividends are paid on the Issuer's common stock. Stock equivalents are paid in an equal number of shares of the Issuer's common stock upon the Reporting Person's termination of service as a director. Reported holdings include stock equivalents 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. /s/ Jason K Mitchell, Attorney-in-fact for Nicole W. Piasecki 2026-05-19