Stonebridge Partners: Buy Box & Recent Acquisitions

At a glance

EBITDA range	$3M to $20M S3
Revenue range	Up to $200M S4
Deal types	Platform, Add-on S4
Geography	United States S4
Sectors	HVAC, Plumbing & Electrical, Construction Services, Industrial & Manufacturing, Distribution

What Stonebridge Partners buys

Stonebridge Partners is a White Plains, New York firm that has been buying niche manufacturing, service and distribution businesses since 1986. It counts more than $930 million invested across 78 transactions, 36 of them platform companies and 42 add-ons. Its stated areas of interest are infrastructure products and services, specialty manufacturing, building products and aerospace. Today it owns an electrical contractor, a mechanical and HVAC services firm, a concrete formwork rental company and several manufacturers.

The firm takes control, or shares control with co-investors, through majority recapitalizations, corporate carve-outs and management buyouts. Its key statistics page gives a ceiling of about $200 million of revenue and an EBITDA range of $3 million to $20 million, while its recent press releases describe a $3 million to $15 million target. Platform companies must be based in the United States. A smaller business can still meet Stonebridge as an add-on: the firm says it will consider add-ons of any size, and Paramount Mechanical is actively buying HVAC service companies in the Mid-Atlantic and Southeast.

Recent deals

Announced in the 24 months before October 28, 2026.

Date	Company	Type	Sector	Source
Feb 2026	CVM ElectricRecapitalization of a Buffalo, NY electrical design and installation contractor, closed January 26, 2026; the Madonia family keeps its leadership roles and a significant stake	Platform	HVAC, Plumbing & Electrical	Source
Oct 2025	American Distributors (ADI)Electronic components distributor held since 2016 sold to AAR CORP., closed September 25, 2025	Exit	Distribution	Source
Jul 2025	Specialty BakersDessert products maker held since 2010 sold to HC Private Investments, a Chicago family office, on May 2, 2025	Exit	Consumer & Food	Source
Jul 2025	Comfort Solutions of TidewaterSuffolk, VA commercial HVAC service company added to Paramount Mechanical on May 1, 2025	Add-on	HVAC, Plumbing & Electrical	Source
Dec 2024	Math MechanicalPortsmouth, VA HVAC, plumbing and medical gas contractor added to Paramount Mechanical on November 21, 2024	Add-on	HVAC, Plumbing & Electrical	Source

Portfolio by sector

From the firm's portfolio page S5.

Current portfolio

CVM Electric
Architectural Polymers
MetalForming
North American Formworx
Paramount Mechanical Corporation
Trivium Packaging

Past investments: American Distributors (ADI), Specialty Bakers

Greymont’s take

How Stonebridge Partners fits a seller

Stonebridge suits a family-owned company in building products, infrastructure services or specialty manufacturing whose owners want liquidity but plan to stay involved. In the CVM Electric deal in January 2026, the founder and his two sons kept their leadership roles and a significant ownership stake, and the lenders on the deal also put in equity. Stonebridge's Operating Partners, several of whom once ran its portfolio companies, work with management on systems, sourcing and acquisitions.

The firm also tends to hold for a long time. It owned Specialty Bakers for almost 15 years and ADI for about nine. HVAC and mechanical contractors in Virginia and nearby states should know that Paramount Mechanical has bought two local service firms since late 2024 and says it wants more. Owners should ask how long Stonebridge expects to hold the business and how the equity they keep will be valued at the next sale.

Questions owners ask

What size company does Stonebridge Partners buy?

Its key statistics page calls for revenue of up to about $200 million and EBITDA of $3 million to $20 million, though its 2025 and 2026 press releases give a $3 million to $15 million range. It will consider add-on acquisitions of any size for its current companies.

Does the family stay involved after a Stonebridge recapitalization?

Often, yes. In the January 2026 CVM Electric deal the founder and his sons kept their leadership roles and a significant stake. The founders of Architectural Polymers and MetalForming also stayed on the board as the largest individual shareholders.

Is Stonebridge buying HVAC companies?

Yes, through Paramount Mechanical, its Manassas, Virginia mechanical and HVAC services company. Paramount bought Math Mechanical in November 2024 and Comfort Solutions of Tidewater in May 2025, and Stonebridge says it is looking for more service-focused HVAC businesses in the Mid-Atlantic and Southeast.

Sources

S1Stonebridge Partners home page Accessed October 28, 2026
S2Stonebridge Partners: About Us Accessed October 28, 2026
S3Stonebridge Partners: Key Statistics Accessed October 28, 2026
S4Stonebridge Partners: Investment Criteria Accessed October 28, 2026
S5Stonebridge Partners: Current Portfolio Companies Accessed October 28, 2026
S6Stonebridge Partners: Former Portfolio Companies (Selected) Accessed October 28, 2026
S7Stonebridge Partners Completes the Recapitalization of CVM Electric (February 23, 2026) Accessed October 28, 2026
S8Stonebridge Partners Announces the Acquisition of Comfort Solutions by Paramount Mechanical (July 3, 2025) Accessed October 28, 2026
S9Stonebridge Partners Announces the Acquisition of Math Mechanical by Paramount Mechanical (December 5, 2024) Accessed October 28, 2026
S10Stonebridge Partners News Accessed October 28, 2026
S11Stonebridge Partners: What We Do Accessed October 28, 2026

Compiled by Greymont Advisors from public sources, including the firm’s own website and press releases. Greymont is not affiliated with Stonebridge Partners. Figures are as reported on the dates shown and may have changed. Request a correction