Westerwood Global Acquires NSTAR Global Services

Global Water Technology Acquires Enerstar

May 18, 2026

IT Services

Global Water Technology, Inc. (GWT) announced it is acquiring Enerstar, Inc., a technically driven water and energy services firm based in Elmhurst, Illinois. The deal is designed to integrate Enerstar’s proprietary field enablement platform, related intellectual property, and team into GWT’s national Water & Energy Services platform to improve technical consistency and scalable field execution.

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.

World Insurance Associates Acquires NorthStar Insurance Services

July 1, 2024

Insurance

World Insurance Associates LLC, a nationally ranked insurance brokerage headquartered in Iselin, New Jersey, acquired the business of NorthStar Insurance Services of Needham, Massachusetts, effective July 1, 2024. Terms were not disclosed; NorthStar (founded in 1995) is one of New England's larger independent insurance agencies providing business and personal insurance and risk management services.

WGNSTAR Acquires Principal Service Solutions (PSS)

June 13, 2024

Staffing & HR

WGNSTAR, a provider of managed workforce and asset lifecycle solutions for the semiconductor industry, has acquired Principal Service Solutions (PSS), a Modesto-based technical workforce provider. The deal expands WGNSTAR's capacity and geographic coverage to better serve the growing U.S. semiconductor market and consolidates its position as a market leader in semiconductor workforce solutions.

The Sterling Group Acquires West Star Aviation from Norwest Equity Partners

March 2, 2022

Aerospace & Defense

The Sterling Group, a middle-market private equity firm, has completed the acquisition of West Star Aviation from Norwest Equity Partners. West Star is a leading independent provider of MRO (maintenance, repair, and overhaul) services to the business aviation industry with primary locations in East Alton, Illinois; Grand Junction, Colorado; Chattanooga, Tennessee; and Perryville, Missouri.

Integrated Global Services Acquires AmStar

January 5, 2022

Industrial Services

Integrated Global Services, Inc. (IGS), a portfolio company of investment affiliates of J.F. Lehman & Company, has acquired GE Steam Power’s on-site thermal spray coatings technology, AmStar, including the patented AmStar 888 material. The acquisition expands IGS’s surface protection and corrosion/erosion-resistant coating capabilities to better serve power-generation and industrial customers across the U.S., Europe, South America and Asia.