Company lists · Data refreshed September 2026

Top 25 Lower middle market investment firms based in Chicago, United States

Name: Lower middle market investment firms based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 276 companies tracked

RevenueBase identified 276 lower middle market investment firms headquartered in Chicago, United States as of September 2026 and tracks 6,532 professional contacts across them, including 3,734 with verified work emails. Across the United States, New York is the largest hub for this category (855 companies); Chicago follows with 276.

This list covers lower middle market investment firms headquartered in Chicago, 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 28, 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 28, 2026 86% judged on-target in blind review

276Companies

6,532Contacts tracked

3,734Verified emails

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The 25 largest lower middle market investment firms based in Chicago, United States

Ranked by team size

Top 25 of 276 lower middle market investment firms based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to lower middle market investment 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	Ziegler	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	435 contacts →
	Strong evidence “Ziegler is a privately held investment bank, capital markets and proprietary investments firm.” Source: RevenueBase Database · checked Sep 28, 2026
2	Adams Street Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	367 contacts →
	Strong evidence “Adams Street Partners is a global investment firm managing a comprehensive suite of private markets investment solutions.” Source: RevenueBase Database · checked Sep 28, 2026
3	Shore Capital Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	327 contacts →
	Strong 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 28, 2026
4	Monroe Capital LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	325 contacts →
	Partial evidence “Monroe Capital LLC (“Monroe”) is a premier asset management firm specializing in private credit markets across various strategies, including direct lending, technology finance…” Source: RevenueBase Database · checked Sep 28, 2026
5	Thoma Bravo	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	309 contacts →
	Partial 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 28, 2026
6	PPM America, INC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	292 contacts →
	Partial evidence “PPM America, Inc.(PPM) is a client-focused investment manager.” Source: RevenueBase Database · checked Sep 28, 2026
7	Gtcr LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 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 28, 2026
8	Livingstone	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	207 contacts →
	Partial evidence “Livingstone is an international mid-market M&A and debt advisory firm with offices in Amsterdam, Beijing, Chicago, Düsseldorf, Frankfurt, Hamburg, London, Los Angeles, Madrid…” Source: RevenueBase Database · checked Sep 28, 2026
9	Portage Point Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	173 contacts →
	Strong evidence “Portage Point is a business advisory, interim management and investment banking firm intensely focused on the middle market.” Source: RevenueBase Database · checked Sep 28, 2026
10	Association For Corporate Growth ACG	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	138 contacts →
	Indirect evidence “Founded in 1954, the Association for Corporate Growth (ACG) has 60 chapters worldwide, representing members.” Source: RevenueBase Database · checked Sep 28, 2026
11	Pgim Private Capital	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	134 contacts →
	Partial evidence “We use a patient, long-term investment strategy applying our scale, relationships, and experience.” Source: RevenueBase Database · checked Sep 28, 2026
12	BPOC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	11-50	131 contacts →
	Indirect evidence “Experience.” Source: RevenueBase Database · checked Sep 28, 2026
13	TPG Twin Brook Capital Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	129 contacts →
	Strong evidence “TPG Twin Brook Capital Partners, TPG Angelo Gordon’s middle market direct lending business, is a direct lending finance company focused on providing cash-flow based financing…” Source: RevenueBase Database · checked Sep 28, 2026
14	Chicago Atlantic	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	110 contacts →
	Strong evidence “Chicago Atlantic is a private market investment firm combining deep expertise with an entrepreneurial approach to multi-asset class investing.” Source: RevenueBase Database · checked Sep 28, 2026
15	NXT Capital	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	103 contacts →
	Strong evidence “NXT Capital is a direct lender with a specialized focus on high-quality middle-market solutions.” Source: RevenueBase Database · checked Sep 28, 2026
16	Madison Dearborn Partners, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	99 contacts →
	Partial evidence “Madison Dearborn Partners, LLC ("MDP") is a leading private equity investment firm based in Chicago that, since its formation in 1992, has raised aggregate capital of…” Source: RevenueBase Database · checked Sep 28, 2026
17	Equity Group Investments	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	86 contacts →
	Partial evidence “Equity Group Investments (EGI) is the private investment firm founded by Sam Zell in 1968.” Source: RevenueBase Database · checked Sep 28, 2026
18	Flexpoint Ford	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	79 contacts →
	Indirect evidence “Flexpoint Ford is a specialist private equity firm focused on financial services and adjacent verticals.” Source: RevenueBase Database · checked Sep 28, 2026
19	Wind Point Partners	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	11-50	78 contacts →
	Partial evidence “Wind Point Partners is a Chicago-based private equity investment firm with approximately $6 billion in assets under management*.” Source: RevenueBase Database · checked Sep 28, 2026
20	RCP Advisors	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	78 contacts →
	Partial evidence “Founded in 2001, RCP Advisors, a strategy of Ridgepost Capital (NYSE: RPC), is a private equity investment firm that provides access to North American small buyout fund managers…” Source: RevenueBase Database · checked Sep 28, 2026
21	Victory Park Capital Advisors	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	74 contacts →
	Indirect evidence “Victory Park Capital Advisors, LLC (“VPC” or the “Firm”) is a global alternative asset manager that specializes in private asset-backed credit.” Source: RevenueBase Database · checked Sep 28, 2026
22	Pmcf Investment Banking	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	11-50	69 contacts →
	Strong evidence “PMCF is a middle market investment bank that provides merger and acquisitions advisory services to individual and family-owned businesses, large public companies, and private…” Source: RevenueBase Database · checked Sep 28, 2026
23	PPC Pritzker Private Capital	Strong evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	67 contacts →
	Strong evidence “PPC partners with middle-market companies based in North America with positions in the manufactured products and services sectors.” Source: RevenueBase Database · checked Sep 28, 2026
24	Morgan Street Holdings	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	65 contacts →
	Partial evidence “Morgan Street Holdings is a holding company and private investment group with a growth mindset, owning a diverse portfolio across industries.” Source: RevenueBase Database · checked Sep 28, 2026
25	Sterling Partners	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	51-200	60 contacts →
	Partial evidence “Sterling Partners is an investment management platform.” Source: RevenueBase Database · checked Sep 28, 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: lower middle market investment 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 lower middle market investment firms.
Partial evidence: Its own public description names part of lower middle market investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lower middle market investment 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 276 lower middle market investment firms based in Chicago, United States

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Lower middle market investment firms based in Chicago, United States at a glance

As of Sep 28, 2026

57.2%Verified-email coverage

23.7Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

158

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 276 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 lower middle market investment 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 Chicago, United States whose own description of what they do matches “lower middle market investment 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 lower middle market investment 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 lower middle market investment firms, and records with no verified work email. Companies headquartered outside Chicago 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, 3,734 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 28, 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.

Lower middle market investment firms 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 lower middle market investment 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 lower middle market investment firms are there based in Chicago, United States?

RevenueBase identified 276 lower middle market investment firms headquartered in Chicago, 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?

Ziegler, headquartered in Chicago, tops this list with the largest team on record.

Which city in the United States has the most lower middle market investment firms?

New York leads the United States with 855 headquartered companies, followed by Chicago (276) and Dallas (204).

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 3,734 verified decision-maker contacts tracked across these 276 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 28, 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.