Simpson holder to sell 3,502 shares under Rule 144

Simpson Manufacturing Co., Inc. (SSD) received a Rule 144 notice indicating that shareholder Michael L. Olosky plans to sell common stock through Fidelity Brokerage Services LLC.

Rhea-AI Filing Summary

Simpson Manufacturing Co., Inc. (SSD) received a Rule 144 notice indicating that shareholder Michael L. Olosky plans to sell common stock through Fidelity Brokerage Services LLC. The notice covers 3,502 shares of common stock, with an indicated aggregate market value of $605,268.55 as of September 10, 2026.

The shares relate to prior restricted stock vesting awards from the issuer, including 2,298 shares that vested on February 17, 2026 and 1,204 shares that vested on February 18, 2025 as compensation.

Key Figures

Shares subject to Rule 144 notice: 3,502 shares Aggregate market value of shares: $605,268.55 Issuer shares outstanding: 40,984,682 shares +3 more

6 metrics

Shares subject to Rule 144 notice 3,502 shares Common stock proposed for sale under Rule 144

Aggregate market value of shares $605,268.55 Value of 3,502 Simpson Manufacturing common shares as of September 10, 2026

Issuer shares outstanding 40,984,682 shares Common shares outstanding of Simpson Manufacturing Co., Inc.

Restricted stock vesting (2026 grant) 2,298 shares Common shares from restricted stock vesting on February 17, 2026 as compensation

Restricted stock vesting (2025 grant) 1,204 shares Common shares from restricted stock vesting on February 18, 2025 as compensation

Form 144 notice date September 10, 2026 Signature date for the Rule 144 notice

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 02/17/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Michael L. Olosky"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for Simpson Manufacturing (SSD)?

The filing discloses that shareholder Michael L. Olosky has notified of a proposed sale under Rule 144 of 3,502 shares of Simpson Manufacturing common stock through Fidelity Brokerage Services LLC, with an indicated aggregate market value of $605,268.55 as of September 10, 2026.

How many Simpson Manufacturing (SSD) shares are covered by this Rule 144 notice?

The notice covers 3,502 shares of Simpson Manufacturing Co., Inc. common stock. This amount appears in the securities information section associated with Fidelity Brokerage Services LLC as the broker handling the proposed sale.

What is the reported value of the SSD shares in this Form 144?

The Form 144 reports an aggregate market value of $605,268.55 for the 3,502 shares of Simpson Manufacturing common stock subject to the notice, as of September 10, 2026.

What is the origin of the Simpson Manufacturing (SSD) shares being sold?

The shares relate to restricted stock vesting from Simpson Manufacturing as compensation, including 2,298 shares that vested on February 17, 2026 and 1,204 shares that vested on February 18, 2025.

Who is involved in executing the proposed sale of SSD shares under Rule 144?

The proposed sale involves shareholder Michael L. Olosky, with Fidelity Brokerage Services LLC listed as the brokerage firm in the securities information section. The filing is signed by Gary Redman as a duly authorized representative of Fidelity, acting as attorney-in-fact for Olosky.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/10/2026 - 03:31 PM Accepted by SEC EDGAR 09/10/2026 - 03:31 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001833593
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Simpson Manufacturing Co., Inc.
SEC File Number	001-13429
Address of Issuer	5956 W LAS POSITAS BLVD PLEASANTON CALIFORNIA 94588
Phone	9255609000
Name of Person for Whose Account the Securities are To Be Sold	Olosky Michael
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	3502	605268.55	40984682	09/10/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/17/2026	Restricted Stock Vesting	Issuer			2298	02/17/2026	Compensation
Common	02/18/2025	Restricted Stock Vesting	Issuer			1204	02/18/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	09/10/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Michael L. Olosky
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)