Madison Dearborn Partners key facts
- Madison Dearborn Partners is a private equity firm based in Chicago, Illinois with 4 tracked portfolio companies.
- Notable positions include The Ardonagh Group, Carnegie Learning, Harmonia Holdings Group.
- Madison Dearborn Partners has 25 funds on record, raising $41.0B across the 25 that report a size.
- The team roster lists 2 people.
About Madison Dearborn Partners
Founded in 1992, Madison Dearborn Partners is a private equity firm based in Chicago, Illinois. The firm seeks to invest in middle and upper-middle-market companies based in the United States. The firm prefers to invest in basic industries, financial services, healthcare, technology & and government sectors. This firm is a Registered Investment Adviser (RIA).
Madison Dearborn Partners portfolio at a glance
4 portfolio companies are on record for Madison Dearborn Partners, including The Ardonagh Group, Carnegie Learning and Harmonia Holdings Group.
Madison Dearborn Partners funds
25 funds are on record for Madison Dearborn Partners, totalling $41 billion across the 25 that report a size. The most recent is Madison Dearborn Capital Partners IX Executive-B, L.P. (2025 vintage), $3 billion.
Madison Dearborn Partners team
2 people are on record at Madison Dearborn Partners: 1 partner and 1 advisor. Senior names include Samuel Mencoff (Founding Partner) and Douglas Grissom (Senior Advisor). 2 of them have a verified direct contact on file.
Is this your firm? Sign in with your work email to keep it current, or tell us what's wrong.
Madison Dearborn Partners at the SEC
Form ADV · 2026-03 · CRD 157349- Regulatory AUM
- —
- Private fund assets
- $21.5B
- Private funds
- 57 · 57 private equity
- Staff
- 73
- Registered office
- CHICAGO, IL
- SEC status
- Approved
Reports custody of client assets.
Source: SEC Investment Adviser Public Disclosure, Form ADV (registered as MADISON DEARBORN PARTNERS, LLC).
- ·The top 10 names in the book — of 4 recorded positions
- ·Watchlist + alerts for Madison Dearborn Partners's activity
Portfolio
4 companies · priced for members| Company | Industry | Valuation | First invested | Role |
|---|---|---|---|---|
| The Ardonagh Group | — | ▮ | ▮ | ▮ |
| Carnegie Learning | — | ▮ | ▮ | ▮ |
| Harmonia Holdings Group | — | ▮ | ▮ | ▮ |
+ 1 more companies · all 4, priced and dated or a free account shows the top 10 names — no card Membership and data by Private Market View | ||||
Funds
6 of 25 recorded- Madison Dearborn Capital Partners IX Executive-B, L.P.2025$3.0B
- Madison Dearborn Capital Partners IX-A, L.P.2025$3.0B
- Madison Dearborn Capital Partners IX-B, L.P.2025$3.0B
- Madison Dearborn Capital Partners IX Executive-A, L.P.2025$3.0B
- Madison Dearborn Capital Partners IX-C, L.P.2025$3.0B
- MADISON DEARBORN CAPITAL PARTNERS VIII EXECUTIVE-B2, L.P.2020$195.0M
$41.0B raised across the 25 funds that report a size
All 25 funds →Partners, principals, and the people who answer a pitch. Pro members reveal contacts with credits.
Frequently asked about Madison Dearborn Partners
- What companies does Madison Dearborn Partners invest in?
- Madison Dearborn Partners has 4 recorded portfolio companies, including The Ardonagh Group, Carnegie Learning, Harmonia Holdings Group.
- What is Madison Dearborn Partners's AUM?
- Madison Dearborn Partners manages approximately $16.1B in assets.