Company lists · Data refreshed September 2026

Top 25 Private equity portfolio companies based in Houston, United States

Name: Private equity portfolio companies based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 152 companies tracked

RevenueBase identified 152 private equity portfolio companies headquartered in Houston, United States as of September 2026 and tracks 1,485 professional contacts across them, including 756 with verified work emails. New York is the largest hub.

This list covers private equity portfolio companies headquartered in Houston, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

152Companies

1,485Contacts tracked

756Verified emails

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The 25 largest private equity portfolio companies based in Houston, United States

Ranked by team size

Top 25 of 152 private equity portfolio companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private equity portfolio companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Quantum Capital GroupStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	51-200	173
	“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…” Source: company website · checked Sep 5, 2026
2	Lime Rock ResourcesIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	51-200	144
	“Formed in 2005, Lime Rock Resources acquires, operates, and improves lower-risk oil and gas properties in the United States.” Source: company website · checked Sep 5, 2026
3	Main Street Capital CorporationIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	51-200	131
	“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…” Source: company website · checked Sep 5, 2026
4	The Sterling GroupStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	120
	“Founded in 1982, The Sterling Group, is a private equity investment firm that targets controlling interests in basic manufacturing, industrial services and distribution companies.” Source: company website · checked Sep 5, 2026
5	ZT CorporateStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	99
	“Established in 1997, ZT Corporate is a private investment firm with a portfolio in healthcare services and automotive dealerships.” Source: company website · checked Sep 5, 2026
6	SCF PartnersPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	54
	“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…” Source: company website · checked Sep 5, 2026
7	Lime Rock PartnersIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	49
	“Founded in 1998, Lime Rock Partners is a creative, value-adding, and long-term investor of growth capital in global energy companies in the exploration & production, energy…” Source: company website · checked Sep 5, 2026
8	Trek ONE CapitalPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	n/a	40
	“Trek One Capital is a family office backed private investment firm focused on lower and middle market acquisitions and strategic investments.” Source: company website · checked Sep 5, 2026
9	The Capstreet GroupIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	29
	“Founded in 1990, Capstreet invests in lower middle market business services companies.” Source: company website · checked Sep 5, 2026
10	Platform Partners LLCPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	26
	“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…” Source: company website · checked Sep 5, 2026
11	Yellowstone Capital Partners, LLCIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	21
	“Yellowstone Capital Partners, LLC is based in Houston and New York.” Source: company website · checked Sep 5, 2026
12	JDH Capital CompanyPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	20
	“JDH Capital is a private investment firm based in Houston, TX.” Source: company website · checked Sep 5, 2026
13	Lilium Group LLCStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	17
	“Lilium Group LLC (“Lilium”) is a Houston-based private equity fund manager focused on middle market investments in the transportation and industrials sectors.” Source: company website · checked Sep 5, 2026
14	Genesis ParkPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	16
	“Founded in Genesis Park uses operational expertise, discipline and patience to build value for portfolio companies and investors, regardless of prevailing market conditions.” Source: company website · checked Sep 5, 2026
15	Post OAK Energy CapitalStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	16
	“Post Oak Energy Capital is a Houston-based private equity firm primarily focused on making domestic investments in the upstream, midstream and oilfield services sectors of the…” Source: company website · checked Sep 5, 2026
16	Amberjack Capital PartnersIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	15
	“We empower companies to unearth their potential, build lasting value and break apart from the crowd.” Source: company website · checked Sep 5, 2026
17	Dauntless Capital PartnersIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	14
	“Dauntless Capital Partners invests in businesses across select industries where strategic capital and operational excellence can drive exceptional growth.” Source: company website · checked Sep 5, 2026
18	TulcanIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	14
	“Founded in 2005, Tulcan is a Houston-based family operating investment partnership.” Source: company website · checked Sep 5, 2026
19	Jumana CapitalPartial evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	13
	“Jumana is a private investment firm specializing in partnerships with entrepreneur lead companies that are looking to transform into enduring businesses.” Source: company website · checked Sep 5, 2026
20	Thesis Capital PartnersIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	11
	“Thesis Capital is an investment partnership that enables visionary entrepreneurs, operators, and family-owned businesses to become industry leaders.” Source: company website · checked Sep 5, 2026
21	JSJ Investments INCIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	11
	“JSJ Investments is a Texas-based family office with a 20-year history of investing in promising businesses.” Source: company website · checked Sep 5, 2026
22	Bluestem Equity, LLCIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	10
	Source: company website · checked Sep 5, 2026
23	Bayou City EnergyStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	11-50	9
	“Bayou City Energy (BCE) is a private equity firm founded in 2015 to focus on making investments in the North American upstream oil and gas sector.” Source: company website · checked Sep 5, 2026
24	LDR Partners LPStrong evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1-10	8
	“LDR Partners LP ("LDR") is a Houston-based private equity firm focused on control investments in lower middle-market industrial manufacturing businesses.” Source: company website · checked Sep 5, 2026
25	Vc5 PartnersIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	501-1,000	8
	“VC5 Partners is a holding company that invests in, manages, and provides support for entrepreneurs with a vision.” Source: company website · checked Sep 5, 2026

Showing 25 of 152 private equity portfolio companies based in Houston, United States

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Private equity portfolio companies based in Houston, United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 913 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

110

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 152 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 private equity portfolio companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Houston, United States whose own description of what they do matches “private equity portfolio companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among private equity portfolio companies, and records with no verified work email. Companies headquartered outside Houston 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 an evidence 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, 756 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 5, 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.

Private equity portfolio companies by metro in the United States

Frequently asked

How many private equity portfolio companies are there based in Houston, United States?

RevenueBase identified 152 private equity portfolio companies headquartered in Houston, 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?

Quantum Capital Group, headquartered in Houston, tops this list with the largest team on record.

Which city has the most private equity portfolio companies?

New York leads with 913 headquartered companies, followed by Chicago (289) and San Francisco (230).

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 756 verified decision-maker contacts tracked across these 152 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 5, 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 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.