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 14, 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. Across the United States, New York is the largest hub for this category (913 companies); Houston has 152.

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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 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 14, 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 14, 2026. RevenueBase Smart Search rates how each company's information relates to private equity portfolio companies: 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	Quantum Capital Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	51-200	173 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
2	Lime Rock Resources	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	51-200	144 contacts →
	Indirect evidence “Formed in 2005, Lime Rock Resources acquires, operates, and improves lower-risk oil and gas properties in the United States.” Source: RevenueBase Database · checked Sep 14, 2026
3	Main Street Capital Corporation	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	51-200	131 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
4	The Sterling Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	120 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
5	ZT Corporate	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	99 contacts →
	Strong evidence “Established in 1997, ZT Corporate is a private investment firm with a portfolio in healthcare services and automotive dealerships.” Source: RevenueBase Database · checked Sep 14, 2026
6	SCF Partners	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	54 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 14, 2026
7	Lime Rock Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	49 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
8	Trek ONE Capital	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	n/a	40 contacts →
	Partial evidence “Trek One Capital is a family office backed private investment firm focused on lower and middle market acquisitions and strategic investments.” Source: RevenueBase Database · checked Sep 14, 2026
9	The Capstreet Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	29 contacts →
	Indirect evidence “Founded in 1990, Capstreet invests in lower middle market business services companies.” Source: RevenueBase Database · checked Sep 14, 2026
10	Platform Partners LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	26 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 14, 2026
11	Yellowstone Capital Partners, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	21 contacts →
	Indirect evidence “Yellowstone Capital Partners, LLC is based in Houston and New York.” Source: RevenueBase Database · checked Sep 14, 2026
12	JDH Capital Company	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	20 contacts →
	Partial evidence “JDH Capital is a private investment firm based in Houston, TX.” Source: RevenueBase Database · checked Sep 14, 2026
13	Lilium Group LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	17 contacts →
	Strong evidence “Lilium Group LLC (“Lilium”) is a Houston-based private equity fund manager focused on middle market investments in the transportation and industrials sectors.” Source: RevenueBase Database · checked Sep 14, 2026
14	Genesis Park	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	16 contacts →
	Partial evidence “Founded in Genesis Park uses operational expertise, discipline and patience to build value for portfolio companies and investors, regardless of prevailing market conditions.” Source: RevenueBase Database · checked Sep 14, 2026
15	Post OAK Energy Capital	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	16 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
16	Amberjack Capital Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	15 contacts →
	Indirect evidence “We empower companies to unearth their potential, build lasting value and break apart from the crowd.” Source: RevenueBase Database · checked Sep 14, 2026
17	Dauntless Capital Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Indirect evidence “Dauntless Capital Partners invests in businesses across select industries where strategic capital and operational excellence can drive exceptional growth.” Source: RevenueBase Database · checked Sep 14, 2026
18	Tulcan	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	14 contacts →
	Indirect evidence “Founded in 2005, Tulcan is a Houston-based family operating investment partnership.” Source: RevenueBase Database · checked Sep 14, 2026
19	Jumana Capital	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	13 contacts →
	Partial evidence “Jumana is a private investment firm specializing in partnerships with entrepreneur lead companies that are looking to transform into enduring businesses.” Source: RevenueBase Database · checked Sep 14, 2026
20	Thesis Capital Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	11 contacts →
	Indirect evidence “Thesis Capital is an investment partnership that enables visionary entrepreneurs, operators, and family-owned businesses to become industry leaders.” Source: RevenueBase Database · checked Sep 14, 2026
21	JSJ Investments INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	11 contacts →
	Indirect evidence “JSJ Investments is a Texas-based family office with a 20-year history of investing in promising businesses.” Source: RevenueBase Database · checked Sep 14, 2026
22	Bluestem Equity, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	10 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
23	Bayou City Energy	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	11-50	9 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
24	LDR Partners LP	Strong evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1-10	8 contacts →
	Strong evidence “LDR Partners LP ("LDR") is a Houston-based private equity firm focused on control investments in lower middle-market industrial manufacturing businesses.” Source: RevenueBase Database · checked Sep 14, 2026
25	Vc5 Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	501-1,000	8 contacts →
	Indirect evidence “VC5 Partners is a holding company that invests in, manages, and provides support for entrepreneurs with a vision.” Source: RevenueBase Database · checked Sep 14, 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: private equity portfolio companies. 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 private equity portfolio companies.
Partial evidence: Its own public description names part of private equity portfolio companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name private equity portfolio companies. 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 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 14, 2026

50.9%Verified-email coverage

9.8Average contacts per company

1-10Median size (employees)

Sep 14, 2026Page data 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 for Houston, 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 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 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.
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 private equity portfolio companies), 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 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 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, 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 14, 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

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 private equity portfolio companies, 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 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 in the United States has the most private equity portfolio companies?

New York leads the United States with 913 headquartered companies, followed by Chicago (289) and San Francisco (230). Houston has 152.

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 14, 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.