WEYERHAEUSER CO 10-Q

Item 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS Issuer Purchases of Equity Securities There were no share repurchases during second quarter 2021. 27 Item 6. EXHIBITS 4.1 Second Amendment to Installment Loan Agreement (including as Annex A the Amended Installment Note) dated as of June 30, 2021 between Weyerhaeuser Company, as borrower, and MeadWestvaco Timber Note Holding Company II, LLC as Holder (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed on July 7, 2021 – Commission File Number 1-4825). 31.1 Certification of Chief Executive Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended. 31.2 Certification of Chief Financial Officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended. 32 Certification pursuant to Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended, and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350). 101.INS XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. 101.SCH Inline XBRL Taxonomy Extension Schema Document 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document 101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document 104 The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2021, has been formatted in Inline XBRL. 28 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. WEYERHAEUSER COMPANY (Registrant) Date: July 30, 2021 By: /s/ David M. Wold David M. Wold Vice President and Chief Accounting Officer (Principal Accounting Officer and Duly Authorized Officer) 29