Company lists · Data refreshed September 2026

Top 25 Add-on acquisition firms based in the United States

Name: Add-on acquisition firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 4,662 companies tracked

RevenueBase identified 4,662 add-on acquisition firms headquartered in the United States as of September 2026 and tracks 70,581 professional contacts across them, including 32,304 with verified work emails. New York is the largest hub.

This list covers add-on acquisition firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

4,662Companies

70,581Contacts tracked

32,304Verified emails

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The 25 largest add-on acquisition firms based in the United States

Ranked by team size

Top 25 of 4,662 add-on acquisition firms based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to add-on acquisition firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	The Carlyle Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,515 contacts →
	Indirect evidence “Carlyle (NASDAQ: CG) is a global investment firm with deep industry expertise that deploys private capital across three business segments: Global Private Equity, Global Credit…” Source: RevenueBase Database · checked Sep 19, 2026
2	H.I.G. Capital	Indirect evidence	Miami, FL, United StatesHQ checked Sep 19, 2026	501-1,000	1,301 contacts →
	Indirect evidence “H.I.G.” Source: RevenueBase Database · checked Sep 19, 2026
3	Advent	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	501-1,000	1,025 contacts →
	Indirect evidence “Advent is a leading global private equity investor committed to working in partnership with management teams, entrepreneurs, and founders to help transform businesses.” Source: RevenueBase Database · checked Sep 19, 2026
4	TA Associates	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	881 contacts →
	Partial evidence “TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: RevenueBase Database · checked Sep 19, 2026
5	Vista Equity Partners	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	501-1,000	839 contacts →
	Indirect evidence “Vista Equity Partners (Vista) is a leading global technology investor specializing in software.” Source: RevenueBase Database · checked Sep 19, 2026
6	Platinum Equity	Indirect evidence	Beverly Hills, CA, United StatesHQ checked Sep 19, 2026	201-500	577 contacts →
	Indirect evidence “Founded in 1995 by Tom Gores, Platinum Equity is a global investment firm with approximately ~$48 billion of assets under management and a portfolio of approximately 60 operating…” Source: RevenueBase Database · checked Sep 19, 2026
7	PSG	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	513 contacts →
	Partial evidence “PSG is a growth equity firm that partners with software and technology-enabled services companies to help them navigate transformational growth, capitalize on strategic…” Source: RevenueBase Database · checked Sep 19, 2026
8	Summit Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	465 contacts →
	Indirect evidence “Summit Partners is a global alternative investment firm with capital dedicated to growth equity, fixed income, and public equity opportunities.” Source: RevenueBase Database · checked Sep 19, 2026
9	Northland	Indirect evidence	Newton, MA, United StatesHQ checked Sep 19, 2026	501-1,000	464 contacts →
	Indirect evidence “Northland is a real estate private equity firm with $8 billion of assets under management, including more than residential units and 1.3 million square feet of commercial space…” Source: RevenueBase Database · checked Sep 19, 2026
10	The Riverside Company	Partial evidence	New York City, NY, United StatesHQ checked Sep 19, 2026	201-500	447 contacts →
	Partial evidence “The Riverside Company is a global investment firm focused on being one of the leading private capital options for business owners and employees at the smaller end of the middle…” Source: RevenueBase Database · checked Sep 19, 2026
11	JRK Property Holdings	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	411 contacts →
	Indirect evidence “JRK Property Holdings is a Los Angeles–based real estate private equity firm founded in 1991 by James Lippman, Robert Rooney, and Keith Holmes.” Source: RevenueBase Database · checked Sep 19, 2026
12	Cd&r	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	51-200	385 contacts →
	Partial evidence “Founded in 1978, CD & R is an investment firm with an investment strategy predicated on building stronger, more profitable businesses.” Source: RevenueBase Database · checked Sep 19, 2026
13	NEW Mountain Capital	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	201-500	346 contacts →
	Indirect evidence “New Mountain Capital (“New Mountain”) is an alternative investment manager with private equity, credit and net lease strategies.” Source: RevenueBase Database · checked Sep 19, 2026
14	W Capital Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	n/a	337 contacts →
	Indirect evidence “W Capital Partners is a private equity firm that provides secondary liquidity to shareholders in private businesses and growth capital for those companies.” Source: RevenueBase Database · checked Sep 19, 2026
15	Shore Capital Partners	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	51-200	327 contacts →
	Indirect evidence “Shore Capital, a Chicago-based private equity firm with an office in Nashville, is an investor in lower-middle market companies in the Healthcare, Food and Beverage, Business…” Source: RevenueBase Database · checked Sep 19, 2026
16	Thoma Bravo	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	201-500	309 contacts →
	Indirect evidence “Thoma Bravo is the world’s largest software-focused investment firm, with more than $172 billion in assets under management as of March 31, 2026.” Source: RevenueBase Database · checked Sep 19, 2026
17	York IE	Partial evidence	Manchester, NH, United StatesHQ checked Sep 19, 2026	201-500	292 contacts →
	Partial evidence “York IE® is an investment and operating firm that combines a family of funds with a hands-on operating platform to build and back software companies.” Source: RevenueBase Database · checked Sep 19, 2026
18	Alpine Investors	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	51-200	278 contacts →
	Indirect evidence “Alpine Investors is a people-driven private equity firm that invests in software and services businesses.” Source: RevenueBase Database · checked Sep 19, 2026
19	HGGC	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 19, 2026	51-200	272 contacts →
	Indirect evidence “Since 2007, we’ve specialized in transforming good businesses into great companies through our differentiated approach to partnership investing.” Source: RevenueBase Database · checked Sep 19, 2026
20	Clearlake Capital Group	Indirect evidence	Santa Monica, CA, United StatesHQ checked Sep 19, 2026	51-200	266 contacts →
	Indirect evidence “Clearlake Capital is a leading global alternative asset manager founded in 2006 with over $185 billion of assets under management.” Source: RevenueBase Database · checked Sep 19, 2026
21	Berkshire Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	255 contacts →
	Partial evidence “Berkshire Partners is a 100% employee-owned, multi-sector specialist investor in private and public equity, with a focus on North American-based, middle-market companies.” Source: RevenueBase Database · checked Sep 19, 2026
22	Roark Capital	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	51-200	252 contacts →
	Indirect evidence “Roark is an Atlanta‐based private equity firm with $41 billion in assets under management.” Source: RevenueBase Database · checked Sep 19, 2026
23	Caprae Capital Partners	Indirect evidence	Glendale, United StatesHQ checked Sep 19, 2026	n/a	248 contacts →
	Indirect evidence “Caprae Capital Partners is a family office investment platform that is not a traditional PE fund - we are a tech-enabled business built to change the lower middle market PE space.” Source: RevenueBase Database · checked Sep 19, 2026
24	Gtcr LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	51-200	237 contacts →
	Indirect evidence “Founded in 1980, GTCR is a leading private equity firm that invests behind The Leaders Strategy™ – finding and partnering with management leaders in core domains to identify…” Source: RevenueBase Database · checked Sep 19, 2026
25	Charlesbank Capital Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	236 contacts →
	Indirect evidence “Based in Boston and New York City, Charlesbank is a leading middle-market private investment firm with $21.5 billion in assets under management as of 3/31/2026.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: add-on acquisition firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names add-on acquisition firms.
Partial evidence: Its own public description names part of add-on acquisition firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name add-on acquisition firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 4,662 add-on acquisition firms based in the United States

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Add-on acquisition firms based in the United States at a glance

As of Sep 19, 2026

45.8%Verified-email coverage

15.1Average contacts per company

1-10Median size (employees)

14.0%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

3,041

11-50

1,236

51-200

263

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,662 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among add-on acquisition firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “add-on acquisition firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names add-on acquisition firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among add-on acquisition firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 32,304 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Add-on acquisition firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names add-on acquisition firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many add-on acquisition firms are there based in the United States?

RevenueBase identified 4,662 add-on acquisition firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

The Carlyle Group, headquartered in Washington, tops this list with the largest team on record.

Which city has the most add-on acquisition firms?

New York leads with 654 headquartered companies, followed by Chicago (254) and Dallas (210).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 32,304 verified decision-maker contacts tracked across these 4,662 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.