Willdan Group has agreed to acquire Mantis Innovation for $285 million in cash. The deal, expected to close in the fourth quarter of 2026, is subject to Hart-Scott-Rodino antitrust approval. Houston-based Mantis provides building controls, energy efficiency, energy advisory, and facility management solutions. The company employs over 220 people and serves data centres, food and beverage, healthcare, and other industries. Mantis is expected to generate $120 million in revenue in 2026 with an adjusted EBITDA margin in the low 20s. The acquisition strengthens Willdan's commercial market presence and energy procurement offering. Willdan will fund the transaction through a $250 million term loan facility, cash on hand, and existing credit facilities. Jefferies served as financial adviser to Mantis.

HOUSTON--(BUSINESS WIRE)--Jun 16, 2026-- Mantis Innovation, a national leader in facility performance and energy efficiency consulting, today announced its acquisition of E4E Solutions, expanding its ability to design and deliver complex mechanical and energy efficiency projects from concept through implementation.

Mantis Innovation acquires E4E Solutions to accelerate the design and implementation of energy efficiency projects across client portfolios. HOUSTON-(BUSINESS WIRE)-Mantis Innovation, a national leader in facility performance and energy efficiency consulting, today announced its acquisition of E4E Solutions, expanding its ability to design and deliver complex mechanical and energy efficiency projects from concept through implementation. "E4E adds a strong engineering foundation that complements what we already do well and strengthens our ability to follow through from insight to implementation." Share This acquisition strengthens Mantis Innovation's ability to execute across the full lifecycle of facility and energy initiatives, combining its expertise in building controls, energy efficiency, energy advisory, and facility management with E4E Solutions' deep engineering and project delivery capabilities. E4E Solutions brings specialized technical experience in mechanical, electrical, and plumbing (MEP) engineering, energy assessments, and design-build project delivery. The firm has a proven track record of delivering high-return projects, including HVAC and central plant upgrades, system retrofits, and utility infrastructure modernization, helping organizations reduce operating costs while improving performance and reliability. As organizations face increasing pressure to reduce energy consumption, extend asset lifespans, and manage capital, many still struggle to translate strategy into execution. The addition of E4E Solutions helps close that gap, ensuring engineering design is grounded in actual asset conditions and carried through to completed, high-return-on-investment projects. "This is really about bringing the right expertise together to better serve our clients," said Darrell Whitley, CEO of Mantis Innovation. "Our job is to help organizations spend smarter, operate more efficiently, and make confident decisions about their facilities and energy strategy. E4E adds a strong engineering foundation that complements what we already do well and strengthens our ability to follow through from insight to implementation." E4E Solutions' capabilities span energy consulting, sustainability program design, and turnkey project delivery, including identifying and designing projects that deliver significant customer savings. Their team of engineers and project professionals is experienced in advancing projects from early-stage assessment through detailed design, construction, and startup. "E4E was built around delivering engineering solutions that perform in the real world - not just on paper - and that focus has helped our clients turn complex energy and infrastructure challenges into high-impact, executable projects," said Josh Long, President & CEO of E4E Solutions. "Joining Mantis Innovation allows us to extend that capability by combining engineering, data, and strategy into a more integrated approach, helping clients move faster from insight to implementation and make more confident capital decisions. I'm incredibly proud of what our team has built and excited about the opportunity to scale our impact as part of Mantis." The combined organization brings together complementary strengths across design, engineering, and implementation, an integrated approach that few providers can deliver at scale. For clients, this means better alignment between how energy is purchased, how assets perform, and how capital projects are prioritized and executed. This is particularly valuable for organizations managing large, distributed portfolios where mechanical system performance, energy use, and capital planning are closely linked. With expanded in-house engineering and delivery capabilities, Mantis Innovation is positioned to accelerate project timelines, improve scoping and design accuracy, and deliver more predictable outcomes. Mantis Innovation will integrate E4E Solutions' team and capabilities over the coming months, with a focus on expanding technical depth, increasing delivery capacity, and maintaining the high level of service both organizations' clients expect. Together, the combined organization is positioned to deliver more execution-ready, data-informed solutions at a time when facility and energy decisions are becoming more complex and more critical to long-term performance. About Mantis Innovation Mantis Innovation is the premier provider of smart solutions that deliver better building performance through managed facility services and turnkey program management. Leveraging expertise from a wide range of professional disciplines, Mantis Innovation offers a full suite of services across facility asset management, building controls, energy efficiency, and energy procurement. About E4E Solutions E4E Solutions is an engineering and project delivery firm specializing in mechanical systems, energy efficiency, and utility infrastructure modernization. The company provides end-to-end services spanning assessment, design engineering, construction, and performance-based project implementation, helping organizations reduce energy consumption, lower operating costs, and improve facility performance. More News From Mantis Innovation HOUSTON-( BUSINESS WIRE )-Mantis Innovation, a national facility performance and energy efficiency consulting firm, today announced the launch of its next-generation Perform platform, advancing how organizations understand, prioritize, and act on facility and energy data across their portfolios. As facility and energy teams manage increasingly complex operations, many struggle with fragmented data, disconnected reporting, and limited visibility into how asset conditions, energy performance, cap... HOUSTON-( BUSINESS WIRE )-Mantis Innovation is pleased to announce the appointment of Chris Kaiser as its new Vice President of Sales. This strategic addition reinforces Mantis Innovation's dedication to providing outstanding sales leadership, fostering growth across various market segments, and positioning its sales team for success in key regions. Chris Kaiser, who joins Mantis as VP of Sales, Projects, West, brings a wealth of experience in the energy efficiency industry, assisting his clien... HOUSTON-( BUSINESS WIRE )-Mantis Innovation is pleased to announce the appointment of two new Vice Presidents of Sales, Jeremy Gonser and Richard Prinz. This strategic addition bolsters Mantis Innovation's commitment to delivering exceptional sales leadership and driving growth across its diverse market segments. Jeremy Gonser, who joins Mantis as VP of Sales, Energy, previously held roles at Constellation, Hudson, Shell Energy, and Gridwealth. Jeremy has built and led successful sales teams, f...