Sterling Infrastructure (STRL) CEO sells 100,000 shares, retains 390,593 stake

Rhea-AI Filing Summary

Sterling Infrastructure CEO Joseph A. Cutillo reported open-market sales of 100,000 shares of Common Stock in two transactions. On March 9, 2026, he sold 52,408 shares at an average price of $408.4179 per share. On March 10, 2026, he sold 47,592 shares at an average price of $416.2103 per share. Both sales were executed in multiple trades within stated price ranges and were made under a Rule 10b5-1 trading plan adopted on December 8, 2025. After these sales, he directly holds 390,593 shares of Sterling Infrastructure common stock, including 20,754 shares that remain subject to transfer restrictions and potential forfeiture.

Insights

Equity compensation and insider-trading analyst

Sterling CEO sells 100,000 shares under a pre-set 10b5-1 plan, retaining a large remaining stake.

CEO Joseph A. Cutillo completed two open-market sales totaling 100,000 shares of Sterling Infrastructure (STRL) common stock on March 9–10, 2026. The average sale prices were $408.4179 and $416.2103 per share, with each transaction executed across multiple trades within disclosed price ranges.

The filing states these transactions were carried out pursuant to a Rule 10b5-1 trading plan adopted on December 8, 2025, indicating they were pre-scheduled rather than timed opportunistically. Following the sales, Cutillo still directly owns 390,593 shares, of which 20,754 shares are subject to sale and forfeiture restrictions, suggesting a continuing, substantial equity stake alongside ongoing liquidity management.

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).

X

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^*

CUTILLO JOSEPH A

(Last) (First) (Middle)

1800 HUGHES LANDING BLVD.

(Street)

THE WOODLANDS TX 77380

(City) (State) (Zip)

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 Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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

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

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

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	03/09/2026		S		52,408(1)	D	$408.4179(2)	438,185(3)	D
Common Stock	03/10/2026		S		47,592(1)	D	$416.2103(4)	390,593(3)	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 8, 2025.

2. Transaction executed in multiple trades at prices ranging from $400.00 to $411.38 per share, inclusive. The price reported in column 4 above reflects the average sale price per share. The Reporting Person hereby undertakes to provide the SEC staff, the Issuer or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

3. Of these shares, 20,754 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances.

4. Transaction executed in multiple trades at prices ranging from $410.20 to $421.40 per share, inclusive. The price reported in column 4 above reflects the average sale price per share. The Reporting Person hereby undertakes to provide the SEC staff, the Issuer or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Remarks:

	Mark D. Wolf (Under a Power of Attorney)	03/11/2026
	** 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.

FAQ

What insider transactions did Sterling Infrastructure (STRL) report for its CEO?

Sterling Infrastructure CEO Joseph A. Cutillo reported two open-market stock sales totaling 100,000 shares. He sold 52,408 shares at an average of $408.4179 and 47,592 shares at $416.2103 per share, as disclosed in the Form 4 filing.

Were the recent STRL CEO share sales made under a Rule 10b5-1 plan?

Yes, the CEO’s Sterling Infrastructure share sales were executed under a Rule 10b5-1 trading plan. The plan was adopted on December 8, 2025, meaning the March 2026 transactions were pre-arranged rather than timed at the CEO’s sole discretion.

How many Sterling Infrastructure (STRL) shares does the CEO still own after these sales?

After the reported transactions, CEO Joseph A. Cutillo directly holds 390,593 STRL shares. Of this amount, 20,754 shares are subject to restrictions on transfer and may be forfeited under certain circumstances, indicating some holdings remain unvested or contingent.

What were the price ranges for the STRL CEO’s recent stock sales?

The CEO’s sales were executed in multiple trades within specified price ranges. One set of trades occurred between $400.00 and $411.38 per share, while the other ranged from $410.20 to $421.40 per share, with reported averages of $408.4179 and $416.2103 respectively.

What is the significance of multiple trade prices in the STRL Form 4 filing?

The Form 4 notes each sale was executed in multiple trades within stated price ranges. The average sale price per share is reported, and the reporting person has undertaken to provide full trade-by-trade pricing details to the SEC, the issuer, or shareholders upon request.

Do any of the STRL CEO’s remaining shares carry restrictions or forfeiture conditions?

Yes, 20,754 of the CEO’s remaining Sterling Infrastructure shares are restricted. These shares are subject to limits on sale or transfer and may be forfeited under certain circumstances, indicating they are likely tied to company equity-based compensation arrangements.