Stellant Systems Acquires Comtech's Power Systems Technology (PST) Product Line

TransDigm Group Acquires Stellant Systems in About $960 Million Deal

January 14, 2026

Aerospace & Defense

TransDigm Group Incorporated entered into a definitive agreement to acquire Stellant Systems, Inc., a portfolio company of Arlington Capital Partners, for approximately $960 million in cash (including certain tax benefits). Stellant designs and manufactures high-power electronic components and subsystems for aerospace and defense and other industrial and medical applications, and is expected to generate about $300 million in revenue in 2025.

Integrated Power Services Acquires Power Systems Testing Company (PST)

May 1, 2025

Industrial Services

Integrated Power Services (IPS) has acquired Power Systems Testing Company (PST), a NETA-certified electrical testing and field services provider headquartered in Livermore, California. The acquisition expands IPS's NETA field-service capabilities and strengthens its West Coast footprint, adding PST's testing, commissioning and engineering expertise to IPS's service network.

Summit Fire & Security Acquires Professional Systems Technology

February 14, 2023

Industrial Services

Summit Fire & Security LLC, a subsidiary of SFP Holding, Inc. (Summit Companies), has completed the acquisition of Professional Systems Technology, Inc. (PST). The acquisition brings PST's low-voltage, fire alarm, life-safety, access control and AV expertise into Summit's Salt Lake City team to expand capabilities and service coverage in the intermountain West.

Arlington Capital Partners Acquires L3Harris' Electron Devices and Narda Microwave-West to Form Stellant Systems

October 4, 2021

Aerospace & Defense

Arlington Capital Partners completed the acquisition of L3Harris Technologies' Electron Devices and Narda Microwave-West divisions and has established the business as Stellant Systems, a standalone platform focused on mission-critical defense and space electronics. The company, led by CEO Paul Russell, designs and manufactures RF amplification products (including traveling wave tubes and microwave power modules) and employs over 800 people across facilities in Torrance, California; Williamsport, Pennsylvania; and Folsom, California.

Comstar Technologies Acquires E-Tel Systems Corporation

January 28, 2019

Telecommunications

Comstar Technologies, a portfolio company of Wincove Private Holdings, has acquired northern Virginia-based E-Tel Systems Corporation. The add-on strengthens Comstar's technology and telecommunications presence in the Washington D.C. metro area and supports the founder's retirement and customer continuity.

PennSpring Capital Acquires PSST

July 26, 2018

Software

PennSpring Capital, a lower middle market private equity firm, acquired Professional Systems Software & Technology (PSST), a Louisville-based iPaaS provider serving K‑12 school districts, municipalities and corporate clients. The deal will fund product investment and expansion of PSST's customer footprint while preserving the company's mission and leadership team.