Northwest Pipe Company has announced a change in its independent registered public accounting firm following the merger of Moss Adams LLP with Baker Tilly US, LLP, effective June 3, 2025. Moss Adams, the former auditors for Northwest Pipe, has resigned, and the company's Audit Committee has approved Baker Tilly as the new auditors. During the recent years and interim periods, there were no disagreements or reportable events with Moss Adams regarding financial statements or auditing practices. Moss Adams' audit reports did not contain any adverse opinions or modifications. A letter from Moss Adams confirming these details has been filed with the Securities and Exchange Commission.