X0609 4 2026-08-17 0001001385 NWPX Infrastructure, Inc. NWPX 0001401658 LARSON KEITH R false 201 NE PARK PLAZA DRIVE SUITE 100 VANCOUVER WA 98684 1 1 Common Stock 2026-08-17 4 S 0 1250 115.8631 D 21133 D Adoption date of referenced 10b5-1(c) plan is: 05-18-2026 This transaction was executed in multiple trades at prices ranging from $114.50 to $117.42 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 Kendrick 2026-08-18