Company lists · Data refreshed September 2026

Top 25 Private investment companies based in Houston, United States

Name: Private investment 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 20, 2026 125 companies tracked

RevenueBase identified 125 private investment companies headquartered in Houston, United States as of September 2026 and tracks 1,226 professional contacts across them, including 600 with verified work emails. New York is the largest hub.

This list covers private investment 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 20, 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 20, 2026 86% judged on-target in blind review

125Companies

1,226Contacts tracked

600Verified emails

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The 25 largest private investment companies based in Houston, United States

Ranked by team size

Top 25 of 125 private investment companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to private investment 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	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	173 contacts →
	Partial 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 20, 2026
2	Main Street Capital Corporation	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
3	The Sterling Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
4	Sanders Morris	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	80 contacts →
	Partial evidence “Sanders Morris was founded in 1987 to formulate a financial services firm that could not only capitalize on investment opportunities – but could actually create them.” Source: RevenueBase Database · checked Sep 20, 2026
5	Pickering Energy Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	54 contacts →
	Indirect evidence “Pickering Energy Partners (PEP) is an energy focused financial services platform.” Source: RevenueBase Database · checked Sep 20, 2026
6	SCF Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	54 contacts →
	Indirect 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 20, 2026
7	Gulfstar Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	42 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 20, 2026
8	Trek ONE Capital	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	n/a	40 contacts →
	Strong 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 20, 2026
9	The Capstreet Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	29 contacts →
	Indirect evidence “Founded in 1990, Capstreet invests in lower middle market business services companies.” Source: RevenueBase Database · checked Sep 20, 2026
10	Platform Partners LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	26 contacts →
	Strong 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 20, 2026
11	Interra Capital Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	22 contacts →
	Strong evidence “Interra Capital is a boutique private equity and financial advisory firm headquartered in Houston, Texas with a primary focus on commercial real estate investments and secondary…” Source: RevenueBase Database · checked Sep 20, 2026
12	Yellowstone Capital Partners, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	21 contacts →
	Indirect evidence “Yellowstone Capital Partners, LLC is based in Houston and New York.” Source: RevenueBase Database · checked Sep 20, 2026
13	JDH Capital Company	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	20 contacts →
	Strong evidence “JDH Capital is a private investment firm based in Houston, TX.” Source: RevenueBase Database · checked Sep 20, 2026
14	Lilium Group LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
15	Genesis Park	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	16 contacts →
	Indirect 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 20, 2026
16	Amberjack Capital Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
17	Dauntless Capital Partners	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 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 20, 2026
18	Jumana Capital	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	13 contacts →
	Strong 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 20, 2026
19	Thesis Capital Partners	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	11 contacts →
	Partial 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 20, 2026
20	JSJ Investments INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	11 contacts →
	Partial evidence “JSJ Investments is a Texas-based family office with a 20-year history of investing in promising businesses.” Source: RevenueBase Database · checked Sep 20, 2026
21	Winterford Capital	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	8 contacts →
	Partial evidence “Winterford Capital is an investment firm that seeks to partner with outstanding businesses and management teams.” Source: RevenueBase Database · checked Sep 20, 2026
22	Aventurine Partners	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	7 contacts →
	Partial evidence “Aventurine Partners is focused on investment opportunities across the energy, power, and industrial sectors.” Source: RevenueBase Database · checked Sep 20, 2026
23	Market Street Capital, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	7 contacts →
	Indirect evidence “We help companies grow their businesses, aligning them with the right capital partners and strategic relationships.” Source: RevenueBase Database · checked Sep 20, 2026
24	Outfitter Energy Capital	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1-10	7 contacts →
	Strong evidence “Outfitter Energy Capital is a Houston-based private equity group focused on middle-market investment opportunities in the oil and gas industry.” Source: RevenueBase Database · checked Sep 20, 2026
25	Leggett Ventures	Strong evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	7 contacts →
	Strong evidence “A Houston-based Private Equity Firm providing access to opportunistic investments in Real Estate, Energy and other alternative asset classes.” Source: RevenueBase Database · checked Sep 20, 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 investment 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 investment companies.
Partial evidence: Its own public description names part of private investment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name private investment 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 125 private investment companies based in Houston, United States

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Private investment companies based in Houston, United States at a glance

As of Sep 20, 2026

48.9%Verified-email coverage

9.8Average contacts per company

1-10Median size (employees)

607.2%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 125 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 investment 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 investment 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 investment 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 investment 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, 600 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 20, 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 investment companies by metro in the United States

Private investment companies in New York759
Private investment companies in Chicago222
Private investment companies in Los Angeles173
Private investment companies in Dallas164
Private investment companies in San Francisco145
Private investment companies in Houston125
Private investment companies in Boston117
Private investment companies in Miami113
Private investment companies in Austin111
Private investment companies in Atlanta89
Private investment companies in Denver63
Private investment companies in Charlotte53
Private investment companies in Washington46
Private investment companies in Tampa39
Private investment companies in San Diego38
Private investment companies in Newport Beach37
Private investment companies in Greenwich36
Private investment companies in Minneapolis35
Private investment companies in Philadelphia34
Private investment companies in Cleveland30
Private investment companies in Birmingham29
Private investment companies in Nashville28
Private investment companies in New York City27
Private investment companies in Stamford27
Private investment companies in Beverly Hills26
Private investment companies in Scottsdale26
Private investment companies in Seattle25

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 investment 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 investment companies are there based in Houston, United States?

RevenueBase identified 125 private investment 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 investment companies?

New York leads with 759 headquartered companies, followed by Chicago (222) and Los Angeles (173).

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 600 verified decision-maker contacts tracked across these 125 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 20, 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.