X0508 4 2026-03-09 0001001385 NWPX Infrastructure, Inc. NWPX 0001228503 MONTROSS SCOTT J 201 NE PARK PLAZA DRIVE SUITE 100 VANCOUVER WA 98684 1 President & CEO 1 Common Stock 2026-03-09 4 S 0 2500 72.3155 D 70977 D Restricted Stock Units Common Stock 7616 7616 D Performance Shares Common Stock 46752 46752 D Adoption date of referenced 10b5-1(c) plan is: 12/03/2025 This transaction was executed in multiple trades at prices ranging from $71.91 to $73.65 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. Each Restricted Stock Unit represents a contingent right to receive one share of NWPX common stock. The Restricted Stock Units vest in installments in January of 2027 and 2028. 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. The Performance Shares vest in installments in March of 2026, 2027 and 2028. /s/ Megan Kendrick 2026-03-10