NWPX Infrastructure (NWPX) EVP logs 3,300-share sale, keeps large stake

Rhea-AI Filing Summary

NWPX Infrastructure, Inc. Executive Vice President Brittain Miles reported an open-market sale of 3,300 shares of common stock at a weighted average price of $70.8912 per share on March 20, 2026. The shares were held indirectly through a trust, where he is a beneficiary, and the sale was executed under a pre-arranged Rule 10b5-1(c) trading plan adopted on December 5, 2025. Following the sale, the trust still holds 20,006 shares of common stock. Miles also has equity incentives directly in his name, including restricted stock units covering 2,691 shares of common stock and performance shares tied to up to 16,761 shares, which vest between 2026 and 2028 based on NWPX’s total EBITDA margin.

Insights

Equity compensation and insider-trading analyst

Pre-planned, modest insider sale with substantial remaining exposure.

Executive Vice President Brittain Miles executed an open-market sale of 3,300 common shares at a weighted average of $70.8912. The shares were held through a trust, and the sale occurred under a pre-established Rule 10b5-1(c) trading plan adopted on December 5, 2025, indicating a pre-planned diversification step rather than opportunistic timing.

After the sale, the trust still holds 20,006 shares of common stock, so the transaction represents only a portion of his indirect holdings. In addition, Miles retains direct equity incentives: restricted stock units for 2,691 underlying shares and performance shares tied to 16,761 underlying shares, all with a zero exercise price, reflecting meaningful continued alignment with shareholders.

The performance shares can vest between 0% and 200% of target based on NWPX’s total EBITDA margin over the measurement period and are scheduled to vest in installments in March 2026, 2027, and 2028. The restricted stock units vest in January 2027 and January 2028, reinforcing ongoing long-term incentives. Overall, the filing shows a routine, pre-planned sale with significant remaining exposure through both stock and performance-based awards.

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

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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^*

Brittain Miles

(Last) (First) (Middle)

201 NE PARK PLAZA DRIVE

SUITE 100

(Street)

VANCOUVER WASHINGTON 98684

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
NWPX Infrastructure, Inc. [ NWPX ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

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	03/20/2026		S(1)		3,300(1)	D	$70.8912(2)	20,006	I	Trust(7)

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
Restricted Stock Units	(3)							(4)	(4)	Common Stock	2,691(3)		2,691	D
Performance Shares	(5)							(6)	(6)	Common Stock	16,761(5)		16,761(5)	D

Explanation of Responses:

1. Adoption date of referenced 10b5-1(c) plan is: 12/05/2025

2. This transaction was executed in multiple trades at prices ranging from $69.6001 to $71.85 per share. The price reported reflects the weighted average sale price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. Each Restricted Stock Unit represents a contingent right to receive one share of NWPX common stock.

4. The Restricted Stock Units vest in installments in January of 2027 and 2028.

5. Performance Shares vest in an amount ranging from 0-200% to the extent such Performance Shares are earned. Performance Shares are earned based on NWPX's total EBITDA margin over the measurement period.

6. The Performance Shares vest in installments in March of 2026, 2027 and 2028.

7. Reporting person is a beneficiary of the trust.

	/s/ Miles Brittain	03/23/2026
	** 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)

FAQ

What did NWPX Executive Vice President Brittain Miles report in this Form 4?

Brittain Miles reported selling 3,300 shares of NWPX common stock at a weighted average of $70.8912 per share. The shares were held through a trust, and the transaction was executed under a pre-arranged Rule 10b5-1(c) trading plan adopted on December 5, 2025.

How many NWPX shares does Brittain Miles hold after the reported sale?

After the sale, a trust associated with Brittain Miles holds 20,006 shares of NWPX common stock. In addition, he has restricted stock units tied to 2,691 shares and performance shares tied to 16,761 shares, providing further potential ownership through equity incentives.

Was the NWPX insider sale by Brittain Miles part of a Rule 10b5-1 plan?

Yes, the 3,300-share sale by Brittain Miles was carried out under a Rule 10b5-1(c) trading plan. The plan’s adoption date is disclosed as December 5, 2025, indicating the transaction was scheduled in advance rather than timed reactively to market developments.

What equity awards in NWPX does Brittain Miles still hold following this Form 4?

Brittain Miles continues to hold restricted stock units representing 2,691 shares of NWPX common stock and performance shares tied to 16,761 shares. The RSUs vest in January 2027 and January 2028, while performance shares vest in March 2026, 2027, and 2028.

How are Brittain Miles’ NWPX performance shares structured and when do they vest?

The performance shares can vest between 0% and 200% of the 16,761 underlying shares, depending on NWPX’s total EBITDA margin over a defined measurement period. These awards are scheduled to vest in installments during March 2026, March 2027, and March 2028.