List of 50 Massachusetts-based Environmental Companies

Name	Sector	Revenue $mlns	M&A Activity			Last 5 Years
Name	Sector	Revenue $mlns	Total	Buy	Sell	Last 5 Years
Wind River Environmental PE Backed Gryphon Investors 2017-04-04 Marlborough, Massachusetts, United States website	Environmental	-	24	24	-
Clean Harbors NYSE : CLH Norwell, Massachusetts, United States website	Environmental	5,889	16	10	6
Axius Water PE Backed XPV Water Partners KKR 2019-12-03 Pocasset, Massachusetts, United States website	Environmental	-	6	6	-
Gradiant PE Backed Warburg Pincus 2021-11-17 Woburn, Massachusetts, United States website	Environmental	-	6	6	-
Controlled Environment Systems PE Backed NewSpring Capital 2020-01-24 Mansfield, Massachusetts, United States website	Environmental	-	3	3	-
ENPRO Services, Inc. Acquired NRC Group Holdings LLC 2016-04-11 Salisbury, Massachusetts, United States website	Environmental	-	3	3	-
Babcock Power Environmental, Inc. Private Worcester, Massachusetts, United States website	Environmental	-	2	2	-
Northstar Recycling PE Backed Ridgemont Equity Partners PNC Erieview Capital 2021-10-05 East Longmeadow, Massachusetts, United States website	Environmental	-	2	2	-
GEI Consultants, Inc. Private Woburn, Massachusetts, United States website	Environmental	-	2	2	-
ThermoEnergy Public Worcester, Massachusetts, United States website	Environmental	3	1	1	-
Cambrian Private Watertown, Massachusetts, United States website	Environmental	-	1	1	-
Graham Waste PE Backed Aavin Equity Advisors 2018-01-01 Brockton, Massachusetts, United States website	Environmental	-	1	1	-
Ionics, Inc. Acquired General Electric 2004-11-24 $1.1B Burlington, Massachusetts, United States website	Environmental	-	1	1	-
Acton Concord Septic, Inc. Acquired Wind River Environmental 2018-02-28 Concord, Massachusetts, United States	Environmental	-	-	-	-
Allonnia PE Backed General Atlantic 2020-10-22 Boston, Massachusetts, United States website	Environmental	-	-	-	-
Northeast Air Solutions Acquired American Air Filter Co, Inc. 2024-03-20 Wilmington, Massachusetts, United States website	Environmental	-	-	-	-

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