Gemspring Capital Acquires Mantis Innovation Group

Willdan Group Acquires Mantis Innovation

September 22, 2026

Energy

Willdan Group agreed to acquire 100% of Mantis Intermediate Holdings, LLC, which operates as Mantis Innovation, for $285 million in cash. The transaction remains subject to HSR antitrust review and other customary closing conditions, with closing expected in the fourth quarter of 2026.

Mantis Innovation Acquires E4E Solutions

June 17, 2026

Professional Services

Mantis Innovation has acquired E4E Solutions to expand its ability to design and deliver complex mechanical and energy-efficiency projects from assessment through implementation. The combined organization brings together Mantis’ expertise in building controls, energy advisory, and facility management with E4E’s engineering and design-build project delivery capabilities.

Gemspring Capital Acquires Midland Industries

May 5, 2023

Industrial Services

Gemspring Capital Management affiliate has acquired Midland Industries, a Kansas City-based manufacturer and distributor of pipe, valve, and fitting products across North America. Existing investor Wynnchurch Capital sold a stake but retained a minority interest and coinvested alongside Gemspring; financial terms were not disclosed.

Gemspring Capital Acquires Majority Stake in JTI Electrical & Instrumentation

January 3, 2022

Industrial Services

Gemspring Capital Management affiliate has acquired a majority interest in JTI Electrical & Instrumentation, a Bakersfield, California-based provider of electrical, mechanical, and automation services to industrial processing facilities. The founder-led management team will remain in place and retain an ownership stake as Gemspring plans to support growth through capability expansion, geographic penetration, and strategic acquisitions.

Gemspring Capital Acquires AINS Inc.

November 8, 2021

Software

An affiliate of Gemspring Capital has acquired a majority interest in AINS Inc., a Gaithersburg, Maryland-based provider of case management software and IT services for government customers. Gemspring plans to partner with AINS's management to expand the company's product portfolio, go-to-market capabilities, implementation, and support organizations to accelerate growth.

Mantis Innovation Group (backed by O2 Investment Partners) Invests in Fairbanks Energy Services

February 23, 2021

Energy

O2 Investment Partners, through its platform Mantis Innovation Group, has made an investment in Fairbanks Energy Services, adding the company's energy-efficiency, HVAC, lighting, and building-automation capabilities to the Mantis platform. The deal expands Mantis' service offering for facility performance, energy efficiency, and ESG initiatives across commercial, industrial and data center clients.