NorthStar Group Acquires Trans Ash Inc.

Northstar Recycling Acquires Complete Recycling

May 4, 2022

Environmental Services

Northstar Recycling Company, a portfolio company of Ridgemont Equity Partners, has acquired Complete Recycling, an asset-light provider of managed waste and recycling services that serves food, beverage and consumer packaged goods customers. The deal expands Northstar's service offerings and national footprint to better serve multi-facility manufacturers and distributors and advance landfill diversion and sustainability initiatives.

Northstar Recycling Acquires Waste Technology Services

October 14, 2025

Environmental Services

Northstar Recycling Company, LLC has acquired Waste Technology Services, LLC, combining two asset-light providers of managed waste, byproduct management and environmental consulting to strengthen technical capabilities and expand sustainability-oriented services. WTS, founded in 1982 and headquartered in Lewiston, New York, will join Northstar's platform (PE-backed after a 2021 recapitalization led by Ridgemont Equity Partners) to deliver broader recycling, reuse and reclamation solutions across specialty chemical, pharmaceutical, high-technology and industrial end markets.

TransTech Group Acquires Cryogenic Technology Resources (CTR)

September 26, 2024

Industrial Services

TransTech Group, a portfolio company of Bridge Industries, has acquired Cryogenic Technology Resources (CTR) to expand its cryogenic systems, fabrication, service and automation capabilities. The deal strengthens TransTech’s end-to-end offering for industrial gas, air separation, and related end markets while expanding geographic reach and service capacity.

Westerwood Global Acquires NSTAR Global Services

February 1, 2023

Industrial Services

Westerwood Global acquired NSTAR Global Services effective February 1, 2023. The acquisition combines Westerwood's managed workforce solutions with NSTAR's asset relocation, facility and equipment services to create a broader asset lifecycle management and workforce solutions provider for the semiconductor and high-technology manufacturing industries.

SER Capital Partners Acquires Charah Solutions

July 13, 2023

Environmental Services

Funds managed by SER Capital Partners completed the acquisition of Charah Solutions, Inc., a Louisville-based provider of environmental remediation, ash management and byproduct recycling services to the power generation industry, for $6.00 per share. The transaction (approved July 12, 2023) takes Charah private from Bernhard Capital Partners and other shareholders; Charah's outstanding 8.50% Senior Notes remain obligations of the company and the business will continue operating under SER with its existing management and nearly 600 employees.

Clairvest (with Ironwood) Invests in Star Waste Systems (Boston Carting Services)

July 1, 2022

Environmental Services

Clairvest Group Inc., through Clairvest Equity Partners VI, made an equity investment to acquire a majority interest in Star Waste Systems (dba Boston Carting Services). Ironwood Capital, an existing investor, participated in the transaction/recapitalization. The deal will support Star Waste’s growth in the Greater Boston market and expand its waste collection and materials-recovery capabilities.