Simpson Manufacturing Co Inc

(a) The following documents are filed as part of this Annual Report on Form 10-K:

1. Consolidated financial statements

The following consolidated financial statements are filed as a part of this report:

Reports of Independent Registered Public Accounting Firms

Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2023, 2022 and 2021

Notes to Consolidated Financial Statements

2. Financial Statement Schedules

The following consolidated financial statement schedule for each of the years in the three-year period ended December 31, 2023, is filed as part of this Annual Report on Form 10-K:

Schedule II - Valuation and Qualifying Accounts-Years ended December 31, 2023, 2022 and 2021.

All other schedules have been omitted as the required information is not present or is not present in amounts sufficient to require submission of the schedule, or because the information required is included in the consolidated financial statements and related notes thereto.

(b) Exhibits

The following exhibits are either incorporated by reference into, or filed or furnished with, this Annual Report on Form 10-K, as indicated below.

3.1 Certificate of Incorporation of Simpson Manufacturing Co., Inc., as amended, is incorporated by reference to Exhibit 3.1 of its Quarterly Report on Form 10-Q for the quarter ended March 31, 2018.

3.2 Amended and Restated Bylaws of Simpson Manufacturing Co., Inc., as amended, are incorporated by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K filed on March 14, 2023.

4.1 Description of Securities Registered under Section 12 of the Exchange Act incorporated by reference to Exhibit 4.1 of Simpson Manufacturing Co., Inc.’s Annual Report on Form 10-K for the year ended December 31, 2019.

10.1*Form of Indemnification Agreement between Simpson Manufacturing Co., Inc. and its directors and executive officers, as well as the officers of Simpson Strong-Tie Company Inc., is incorporated by reference to Exhibit 10.2 of Simpson Manufacturing Co., Inc.’s Annual Report on Form 10-K for the year ended December 31, 2004.

10.2 Amended and Restated Credit Agreement among the Company, the subsidiaries of the Company party thereto as guarantors, the lenders party thereto, Wells Fargo Bank, National Association, as administrative agent, and the other parties party thereto is incorporated by reference to Exhibit 10.1 of the Company's Current Report on Form 8-K filed April 4, 2022.

10.3 Securities Purchase Agreement by and between Simpson Strong-Tie Europe, Simpson Manufacturing Co., Inc., on the one hand and the sellers identified herein, on the other hand, with respect to Fixco Invest, dated January 26, 2022 is incorporated by reference to Exhibit 2.1 of the Company's Current Report on Form 8-K filed on January 31, 2022.

10.4 Amendment No. 1 to the Securities Purchase Agreement by and between Simpson Strong-Tie Europe, Simpson Manufacturing Co., Inc., on the other hand, and the sellers identified therein, on the other hand, with respect to Fixco Invest, dated March 17, 2022 is incorporated by reference to Exhibit 10.2 of the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2022.

10.5*Simpson Manufacturing Co., Inc. Executive Officer Cash Profit Sharing Plan, as amended through March 17, 2017 isfiled herewith.

10.6*Simpson Manufacturing Co., Inc. Amended and Restated 2011 Incentive Planis incorporated by reference to Exhibit A of Simpson Manufacturing Co., Inc.’s Schedule 14A Proxy Statement dated March 9, 2015.

10.7*Simpson Manufacturing Co., Inc. 401(k) Profit Sharing Plan is incorporated by reference to Exhibit 4.5 of Simpson Manufacturing Co., Inc.’s Registration Statement on Form S-8, File Number 333-173811, dated December 15, 2015.

10.8*Simpson Manufacturing Co., Inc. Non-qualified Plan is incorporated by reference to Exhibit 4.3 of the Company's Form S-8 filed on May 8, 2023.

10.9*Form of Simpson Manufacturing Co., Inc. Director Time Based Restricted Stock Unit Agreement is incorporated by reference to Exhibit 10.9 of its Annual Report on Form 10-K dated February 28, 2022.

10.10*Form of Simpson Manufacturing Co., Inc.2022 Performance Based Restricted Stock Unit Agreement is incorporated by reference to Exhibit 10.10 of its Annual Report on Form 10-K dated February 28, 2022.

10.11*Form of Simpson Manufacturing Co., Inc.2022 Time Based Restricted Stock Unit Agreement is incorporated by reference to Exhibit 10.11 of its Annual Report on Form 10-K dated February 28, 2022.

10.12*Form of Simpson Manufacturing Co., Inc. 2024 Performance Based Restricted Stock Unit Agreement isfiled herewith.

10.13*Form of Simpson Manufacturing Co., Inc. 2024 Time Based Restricted Stock Unit Agreement is filed herewith.

21. List of Subsidiaries of the Registrant is filed herewith.

23 Consent of Grant Thornton LLP is filed herewith.

31.1 Chief Executive Officer’s Rule 13a-14(a)/15d-14(a) Certification is filed herewith.

31.2 Chief Financial Officer’s Rule 13a-14(a)/15d-14(a) Certification is filed herewith.

32. Section 1350 Certifications are furnished herewith.

33. Compensation Recovery Policyof Simpson Manufac turing Co., Inc., effective as of July 28, 2023, is filed herewith.

101 Financial statements from the annual report on Form 10-K of Simpson Manufacturing Co., Inc. for the year ended December 31, 2023, formatted in XBRL, are filed herewith and include: (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Statement of Comprehensive Income, (iv) the Consolidated Statements of Stockholders’ Equity, (v) the Consolidated Statements of Cash Flows and (vi) the Notes to Consolidated Financial Statements.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document).