Sterling Infrastructure CFO reports tax share withholding

Sterling Infrastructure’s CFO Nicholas M. Grindstaff reported a tax-withholding disposition of 556 shares of common stock at $682.29 per share.

Accepted by SEC EDGAR 07/14/2026 - 04:03 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Sterling Infrastructure’s CFO Nicholas M. Grindstaff reported a tax-withholding disposition of 556 shares of common stock at $682.29 per share. The shares were retained by the company to satisfy tax obligations from a restricted stock unit release. He now holds 6,037 shares directly, including 4,735 that remain subject to sale restrictions and potential forfeiture.

Insider Trade Summary

Tax Withholding: 556 shares

Tax Withholding 1 txn

Insider GRINDSTAFF NICHOLAS M

Role Chief Financial Officer (CFO)

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1, F2	556	$682.29	$379K

Holdings After Transaction: Common Stock — 6,037 shares (Direct)

Holdings Before and After: Common Stock, 6,593 to 6,037 shares (Direct)

Footnotes (2)

1. F1. These shares were retained by the Company at the election of the Reporting Person pursuant to a procedure approved by the Compensation Committee of the Board of Directors to satisfy the Company's tax withholding requirements (based on the closing price of the Company's common stock on the release date) arising from the release of restrictions as permitted by the plan pursuant to which the restricted stock unit award was made.
2. F2. Of these shares, 4,735 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances.

Key Figures

Tax-withheld shares: 556 shares Price per share: $682.29 Shares held after transaction: 6,037 shares +1 more

4 metrics

Tax-withheld shares 556 shares Shares retained by the company to satisfy tax withholding from RSU release

Price per share $682.29 Value used for the 556-share tax-withholding disposition

Shares held after transaction 6,037 shares Total common shares directly owned by the CFO following the disposition

Restricted shares outstanding 4,735 shares Portion of the CFO’s holdings subject to restrictions and potential forfeiture

Key Terms

tax withholding requirements, restricted stock unit award, release of restrictions, forfeiture

4 terms

tax withholding requirements financial

"to satisfy the Company's tax withholding requirements (based on the closing price"

restricted stock unit award financial

"arising from the release of restrictions as permitted by the plan pursuant to which the restricted stock unit award was made"

A restricted stock unit award is a promise by a company to give an employee a specified number of company shares at a future date if certain conditions are met, such as staying with the company or hitting performance goals. For investors, these awards matter because they can increase the total number of shares outstanding when converted, diluting existing holders, and they align employees’ incentives with shareholders’ interests much like giving a rising bonus that becomes real only after conditions are satisfied.

release of restrictions financial

"arising from the release of restrictions as permitted by the plan"

forfeiture financial

"shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances"

FAQ

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

What insider transaction did STRL’s CFO Nicholas Grindstaff report?

CFO Nicholas Grindstaff reported a tax-withholding disposition of 556 shares of Sterling Infrastructure common stock at $682.29 per share. The company retained these shares to cover tax withholding triggered by a restricted stock unit release approved under its compensation plan.

Was the STRL CFO’s Form 4 transaction an open-market sale?

No. The 556 shares were retained by the company to satisfy tax withholding requirements from a restricted stock unit vesting, not an open-market sale. The Form 4 describes this as a payment of tax liability by delivering securities to Sterling Infrastructure.

How many Sterling Infrastructure (STRL) shares does the CFO hold after this filing?

After the tax-withholding disposition, Nicholas Grindstaff directly holds 6,037 shares of Sterling Infrastructure common stock. According to the disclosure, 4,735 of these shares remain subject to restrictions on sale or transfer and to potential forfeiture under certain circumstances.

What price was used for the STRL CFO’s tax-withholding share disposition?

The transaction used a price of $682.29 per share for the 556 shares retained by the company. The footnote states that tax withholding was based on the closing price of Sterling Infrastructure’s common stock on the restricted stock unit release date.

Why did Sterling Infrastructure (STRL) retain 556 of the CFO’s shares?

Sterling Infrastructure retained 556 shares at the CFO’s election to satisfy the company’s tax withholding requirements. This arose from the release of restrictions on a restricted stock unit award under a company plan approved by the Compensation Committee of the Board of Directors.

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

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

GRINDSTAFF NICHOLAS M

(Last) (First) (Middle)

1800 HUGHES LANDING BLVD.

SUITE 250

(Street)

THE WOODLANDS TEXAS 77380

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
STERLING INFRASTRUCTURE, INC. [ STRL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer (CFO)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/10/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/10/2026		F		556(1)	D	$682.29(1)	6,037(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These shares were retained by the Company at the election of the Reporting Person pursuant to a procedure approved by the Compensation Committee of the Board of Directors to satisfy the Company's tax withholding requirements (based on the closing price of the Company's common stock on the release date) arising from the release of restrictions as permitted by the plan pursuant to which the restricted stock unit award was made.

2. Of these shares, 4,735 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances.

Remarks:

	Nicholas M. Grindstaff	07/14/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)