Exhibit 99.1 Willdan Group Reports Second Quarter Results ANAHEIM, Calif. –August 7, 2025 – Willdan Group, Inc. ("Willdan") (Nasdaq: WLDN) today announced its financial results for the second quarter ended July 4, 2025. Second Quarter 2025 Highlights a Six Months Year to Date 2025 Highlights a Executive Management Comments "We delivered a strong first half of the year, with second quarter results reflecting double-digit revenue and adjusted EBITDA growth, and triple-digit earnings per share growth," said Mi ...