Willdan to Acquire Mantis Intermediate Holdings for $285M Cash, Closing Expected October 30
WLDN sits 26% above its 52-week low of $64.665.
Summary
Willdan Group signed a definitive agreement to acquire Mantis Intermediate Holdings for $285 million in cash, with closing expected October 30, 2026, subject to HSR clearance and customary conditions.
Key Events · M&A and Partnerships · WLDN
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Definitive $285M Acquisition Agreement Signed
Willdan Energy Solutions, a wholly owned subsidiary, agreed to acquire 100% of Mantis Intermediate Holdings from Mantis NewCo, LLC for a base purchase price of $285 million in cash, subject to working capital, cash, indebtedness, and transaction expense adjustments.
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Full Corporate Guarantee and Financing
Willdan Group, Inc. provided an absolute, unconditional, and irrevocable guarantee of all Energy Solutions' obligations, and Energy Solutions obtained a debt commitment letter to fund the acquisition.
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$5M Adjustment Escrow and R&W Insurance
The agreement includes a $5 million adjustment escrow held by JPMorgan Chase Bank, N.A., and Energy Solutions has conditionally bound representations and warranties insurance covering certain seller breaches.
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Closing Timeline and Conditions
Closing is scheduled for October 30, 2026, subject to HSR Act waiting period expiration, accuracy of representations, and absence of legal impediments. The Outside Date is November 30, 2026, extendable to January 4, 2027 if only HSR clearance remains outstanding.
Analysis · WLDN · Trade & Services
Willdan Group, through its wholly owned subsidiary Willdan Energy Solutions, has entered into a definitive agreement to acquire 100% of Mantis Intermediate Holdings for a base purchase price of $285 million in cash, subject to working capital, cash, indebtedness, and transaction expense adjustments. The deal is backed by a debt commitment letter and a full corporate guarantee from Willdan Group, with a $5 million adjustment escrow. Closing is targeted for October 30, 2026, subject to HSR clearance and other customary conditions. This is a transformative acquisition for Willdan, deepening its energy solutions footprint, and the definitive terms confirm the previously reported headline price while adding material detail on financing, guarantee structure, and closing mechanics.
How filings like this one have moved
In the 30 days to Oct 2, 2026, 36.4% of the 1070 measured filings Wiseek scored 8 moved their stock by 5% or more by the next session's close. The median move was -0.57%. These are measured outcomes after filings of this importance, not a forecast for this one.
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At the time of this filing, WLDN was trading at $81.36 on NASDAQ in the Trade & Services sector, with a market capitalization of approximately $1.2B. The 52-week trading range was $64.67 to $137.00. This filing was assessed with positive market sentiment and an importance score of 8 out of 10.