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  4. [Form 4] NWPX Infrastructure, Inc. Insider Trading Activity

NWPX director sells 1,172 shares at $110 avg

Director Keith R. Larson sold 1,172 shares at about $110.04 each, leaving him with 18,711 shares after the Aug. 31, 2026 10b5-1 plan sale.

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

NWPX Infrastructure, Inc. (NWPX) director Keith R. Larson reported selling 1,172 shares of common stock on August 31, 2026 in an open-market transaction at a weighted average price of $110.0398 per share. After this sale, he directly holds 18,711 shares. The transaction was made under a Rule 10b5-1(c) trading plan adopted on May 18, 2026 and was executed in multiple trades between $110.00 and $110.19 per share.

Positive

  • None.

Negative

  • None.
Insider LARSON KEITH R
Role Director
Sold 1,172 shs ($129K)
Type Security Shares Price Value
Sale Common Stock F1, F2 1,172 $110.0398 $129K
Holdings After Transaction: Common Stock — 18,711 shares (Direct)
Footnotes (2)
  1. F1. Adoption date of referenced 10b5-1(c) plan is: 05-18-2026
  2. F2. This transaction was executed in multiple trades at prices ranging from $110.00 to $110.19 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.
Shares sold 1,172 shares Common stock sale by director Keith R. Larson on August 31, 2026
Weighted average sale price $110.0398 per share Open-market sale of NWPX common stock on August 31, 2026
Sale price range $110.00–$110.19 per share Multiple trades comprising the August 31, 2026 sale
Shares owned after transaction 18,711 shares Direct holdings of Keith R. Larson following the August 31, 2026 sale
Rule 10b5-1(c) plan adoption date May 18, 2026 Trading plan governing the reported August 31, 2026 sale
Rule 10b5-1(c) plan regulatory
"Adoption date of referenced 10b5-1(c) plan is: 05-18-2026"
weighted average sale price financial
"The price reported reflects the weighted average sale price"
open market or private transaction market
"Sale in open market or private transaction"

FAQ

What insider transaction did NWPX director Keith R. Larson report?
Keith R. Larson reported selling 1,172 shares of NWPX common stock on August 31, 2026 in an open-market transaction at a weighted average price of $110.0398 per share, executed in multiple trades between $110.00 and $110.19 per share.

How many NWPX shares does Keith R. Larson own after this Form 4 transaction?
After the reported sale, Keith R. Larson directly owns 18,711 shares of NWPX common stock. This figure reflects his holdings immediately following the August 31, 2026 transaction disclosed in the Form 4 filing.

Was the August 31, 2026 NWPX stock sale by Keith R. Larson under a Rule 10b5-1 plan?
Yes. The filing states the sale was made under a Rule 10b5-1(c) trading plan adopted on May 18, 2026, and the Form 4 indicates the Rule 10b5-1 checkbox as affirmed.

What price range were the NWPX shares sold for in Keith R. Larson’s August 31, 2026 transaction?
The shares were sold in multiple trades at prices ranging from $110.00 to $110.19 per share. The reported transaction price of $110.0398 per share represents the weighted average sale price across those trades.

How many total NWPX shares did Keith R. Larson sell in this Form 4 filing?
He sold 1,172 shares of NWPX common stock in the reported transaction on August 31, 2026, categorized as a sale in an open-market or private transaction.

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SEC Form 4
FORM 4UNITED 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*
LARSON KEITH R
(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/31/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/31/2026S(1)1,172(1)D$110.0398(2)18,711D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Adoption date of referenced 10b5-1(c) plan is: 05-18-2026
2. This transaction was executed in multiple trades at prices ranging from $110.00 to $110.19 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.
/s/ Megan Kendrick09/01/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR