Company lists · Data refreshed September 2026

Top 25 Upper middle market private equity firms based in Houston, United States

RevenueBase identified 194 company matches for upper middle market private equity firms associated with Houston, United States as of September 2026 and tracks 1,935 professional contacts across them, including 920 with verified work emails. Across the United States, New York is the largest hub for this category (988 companies); Houston has 194.

This list covers company matches for upper middle market private equity firms associated with Houston, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 21, 2026 How this list was built
194Companies
1,935Contacts tracked
920Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest upper middle market private equity firms based in Houston, United States

Ranked by team size
Top 25 of 194 company matches for upper middle market private equity firms based in Houston, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202651-200173 contacts →

Exact match

“Founded in 1998, Quantum Capital Group is a leading provider of private equity, credit, and venture capital to the global energy and energy transition industry, having managed…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202651-200131 contacts →

Exact match

“Main Street Capital (NYSE: MAIN) is a leading provider of long-term, flexible capital solutions to established lower middle market companies, supporting American businesses that…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-50120 contacts →

Exact match

“Founded in 1982, The Sterling Group, is a private equity investment firm that targets controlling interests in basic manufacturing, industrial services and distribution companies.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-50109 contacts →

Exact match

“Stellus Capital Management is a leading private credit manager focused on the North American lower middle market.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5Exact matchHouston, TX, United StatesHQ recorded Sep 21, 20261,001-5,00099 contacts →

Exact match

“Established in 1997, ZT Corporate is a private investment firm with a portfolio in healthcare services and automotive dealerships.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202651-20054 contacts →

Exact match

“Pickering Energy Partners (PEP) is an energy focused financial services platform.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5054 contacts →

Exact match

“Founded in 1989, SCF Partners (“SCF”) provides equity capital and strategic growth assistance to build leading energy service and equipment companies that operate throughout the…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5048 contacts →

Exact match

“Founded in 2009, EIV Capital is a Houston-based private equity firm specializing in providing growth equity to the North American energy industry.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5043 contacts →

Exact match

“Pan Capital is an energy-focused investment firm committed to identifying opportunities and delivering value for our investors.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5042 contacts →

Exact match

“GulfStar is one of the leading middle market investment banking firms in the United States, with deep experience in mergers and acquisitions, private capital placement and…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11Exact matchHouston, TX, United StatesHQ recorded Sep 21, 2026n/a40 contacts →

Exact match

“Trek One Capital is a family office backed private investment firm focused on lower and middle market acquisitions and strategic investments.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202651-20032 contacts →

Exact match

“EnCap Investments is a premier private markets investor with a multi-decade track record of value creation across the North American energy landscape.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5029 contacts →

Exact match

“Founded in 1990, Capstreet invests in lower middle market business services companies.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5026 contacts →

Exact match

“Founded in 2006, Platform Partners LLC is a Houston-based private investment firm that partners with founders and executives of companies with enterprise values typically between…”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15Exact matchHouston, TX, United StatesHQ recorded Sep 21, 20261-1021 contacts →

Exact match

“Yellowstone Capital Partners, LLC is based in Houston and New York.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5020 contacts →

Exact match

“JDH Capital is a private investment firm based in Houston, TX.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5018 contacts →

Exact match

“BroadVail Capital Partners is a private equity firm that partners with best-in-class management teams to build institutional real estate investment platforms.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5017 contacts →

Exact match

“ApexOne Investment Partners is a privately held real estate investment firm and fund manager.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5017 contacts →

Exact match

“Lilium Group LLC (“Lilium”) is a Houston-based private equity fund manager focused on middle market investments in the transportation and industrials sectors.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20Exact matchHouston, TX, United StatesHQ recorded Sep 21, 20261-1016 contacts →

Exact match

“Founded in Genesis Park uses operational expertise, discipline and patience to build value for portfolio companies and investors, regardless of prevailing market conditions.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5016 contacts →

Exact match

“We don’t invest where everyone else does.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5015 contacts →

Exact match

“We empower companies to unearth their potential, build lasting value and break apart from the crowd.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23Exact matchHouston, TX, United StatesHQ recorded Sep 21, 202611-5014 contacts →

Exact match

“Dauntless Capital Partners invests in businesses across select industries where strategic capital and operational excellence can drive exceptional growth.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24Exact matchHouston, TX, United StatesHQ recorded Sep 21, 20261-1014 contacts →

Exact match

“Founded in 2005, Tulcan is a Houston-based family operating investment partnership.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25Exact matchHouston, TX, United StatesHQ recorded Sep 21, 20261-1013 contacts →

Exact match

“Jumana is a private investment firm specializing in partnerships with entrepreneur lead companies that are looking to transform into enduring businesses.”

Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase

Showing 25 of 194 upper middle market private equity firms based in Houston, United States

See the full list, filter by size, metro and specialty, and access 920 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Upper middle market private equity firms based in Houston, United States at a glance

As of Sep 21, 2026
47.5%Verified-email coverage
10.0Average contacts per company
1-10Median size (employees)
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
132
11-50
47
51-200
10
201-500
3
1,001-5,000
1

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 194 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with Houston, United States whose business descriptions match “upper middle market private equity firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 920 professional contacts with verified work emails across the full matched dataset. 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 21, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Upper middle market private equity firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “upper middle market private equity firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many upper middle market private equity firms are there based in Houston, United States?

RevenueBase identified 194 company matches for upper middle market private equity firms associated with Houston, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Quantum Capital Group tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most upper middle market private equity firms?

New York leads the United States with 988 company records, followed by Chicago (333) and Dallas (294). Houston has 194.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 920 professional contacts with verified work emails tracked across these 194 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 194 upper middle market private equity firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

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 SmartSearch, 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.