FMR LLC holds 2.65M shares in Simpson Manufacturing (SSD), 6.4% stake

Rhea-AI Filing Summary

FMR LLC amended a Schedule 13G to report beneficial ownership of 2,646,302.51 shares of Simpson Manufacturing Co. common stock, representing 6.4% of the class. The filing shows sole voting power of 2,640,391.09 shares and sole dispositive power of 2,646,302.51 shares. The cover lists the issuer address as 5956 W Las Positas Blvd, Pleasanton, CA.

Insights

Institutional Ownership Analyst

FMR LLC reported a >5% passive stake in Simpson Manufacturing.

FMR LLC's Amendment No. 1 to Schedule 13G discloses beneficial ownership of 2,646,302.51 shares, equal to 6.4% of the outstanding common stock. The filing attributes sole voting power of 2,640,391.09 shares and sole dispositive power for the full holding.

Ownership is reported on behalf of investment advisory entities; the filing notes that other persons may have the right to proceeds or dividends but no single other person exceeds 5.0%. Subsequent filings may clarify any subsidiary attribution referenced in Exhibit 99.

Key Figures

Beneficial ownership: 2,646,302.51 shares Percent of class: 6.4% Sole voting power: 2,640,391.09 shares +3 more

6 metrics

Beneficial ownership 2,646,302.51 shares Amount beneficially owned per Item 4

Percent of class 6.4% Percent of common stock reported in Item 4

Sole voting power 2,640,391.09 shares Sole power to vote reported on cover page

Sole dispositive power 2,646,302.51 shares Sole power to dispose reported in Item 4

CUSIP 829073105 CUSIP listed on the cover

Filing signature date 05/05/2026 Signature date on amendment

Key Terms

Schedule 13G/A, beneficial ownership, sole dispositive power, Exhibit 99

4 terms

Schedule 13G/A regulatory

"Amendment No. 1 to Schedule 13G to report beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial ownership financial

"Amount beneficially owned: 2646302.51"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 2646302.51"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Exhibit 99 legal

"Please see Exhibit 99 for 13d-1(k)(1) agreement"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

SIMPSON MANUFACTURING CO

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

829073105

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 829073105

1

Names of Reporting Persons

FMR LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,640,391.09
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,646,302.51
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,646,302.51

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.4 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 829073105

1

Names of Reporting Persons

Abigail P. Johnson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,646,302.51
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,646,302.51

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.4 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SIMPSON MANUFACTURING CO
(b)	Address of issuer's principal executive offices: 5956 W LAS POSITAS BLVD,PLEASANTON,CA,US,94588
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 829073105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 2646302.51
(b)	Percent of class: 6.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 2646302.51
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of SIMPSON MANUFACTURING CO. No one other person's interest in the COMMON STOCK of SIMPSON MANUFACTURING CO is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

FMR LLC

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of April 13, 2026, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	05/05/2026

Abigail P. Johnson

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of April 13, 2026, by and on behalf of Abigail P. Johnson*
Date:	05/05/2026

Comments accompanying signature: *This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on April 29,2026, accession number: 0000315066-26-000738.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.

FAQ

What stake does FMR LLC report in Simpson Manufacturing (SSD)?

FMR LLC reports beneficial ownership of 2,646,302.51 shares, representing 6.4% of Simpson Manufacturing common stock. This stake is reported on Amendment No. 1 to a Schedule 13G filing and lists sole dispositive power for the full amount.

How much voting power does FMR LLC hold in SSD?

The filing shows sole voting power of 2,640,391.09 shares and shared voting power of 0.00. The Schedule 13G/A attributes control of voting to FMR LLC as reported on the cover responses to Items 5 and 6.

Does anyone else hold more than 5% of Simpson Manufacturing according to the filing?

The filing states one or more other persons may have rights to dividends or proceeds, but no other person’s interest exceeds 5% of the total outstanding common stock, per Item 6 disclosures in the Schedule 13G/A.

What address is listed for Simpson Manufacturing in the filing?

The issuer's principal executive office is listed as 5956 W Las Positas Blvd, Pleasanton, CA 94588. That address appears in Item 1 alongside the issuer name, Simpson Manufacturing.

Who signed the Schedule 13G/A amendment for FMR LLC?

The filing is signed by Richard Bourgelas as duly authorized under a Power of Attorney on behalf of FMR LLC and on behalf of Abigail P. Johnson, with signature dates shown as 05/05/2026.