Willdan Group Subsidiary to Acquire Mantis Intermediate Holdings for $285 Million

Willdan Group's wholly-owned subsidiary, Willdan Energy Solutions, Inc., has entered into a definitive agreement to acquire Mantis Intermediate Holdings, LLC for a base purchase price of $285 million in cash. The acquisition from seller Mantis NewCo, LLC is subject to customary closing conditions and regulatory approvals.

Key Details

• Agreement Terms: Per the agreement dated September 22, 2026, Willdan Energy Solutions will acquire 100% of the equity securities of Mantis Intermediate Holdings.
• Purchase Price: The transaction has a base purchase price of $285 million in cash, which is subject to adjustments for working capital, cash, indebtedness, and other transaction expenses.
• Closing & Conditions: The acquisition is expected to close around October 30, 2026, contingent on the satisfaction of conditions, including the expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act.
• Parent Guarantee: Willdan Group, Inc. has unconditionally guaranteed all payment and performance obligations of its subsidiary under the purchase agreement.