MADISON DEARBORN PARTNERS, LLC
MADISON DEARBORN PARTNERS, LLC is a Private limited company (Ltd.) registered in United States under L00261815, and its current status with Illinois Secretary of State is active. The company was incorporated on 23 February 1999 and lists its registered address as CHICAGO, United States. No shareholders are recorded for MADISON DEARBORN PARTNERS, LLC; ownership in this jurisdiction is held as the stock ledger under state corporate law (e.g. §219 of the Delaware General Corporation Law), a record kept privately rather than filed publicly. No beneficial owner (UBO) data is recorded for MADISON DEARBORN PARTNERS, LLC; access to beneficial-ownership data in this jurisdiction is governed by its own register rules. This profile is sourced directly from Illinois Secretary of State and was last updated on 13 October 2026.
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Officers
3
Three officers are currently on record for MADISON DEARBORN PARTNERS, LLC, filed with Illinois Secretary of State. Samuel M. Mencoff, Paul Finnegan and Samuel Mencoff all serve as Manager.
The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Group Structure
MADISON DEARBORN PARTNERS, LLC has no recorded parent company — it sits at the top of its own group structure, with 6 subsidiaries recorded beneath it across 1 jurisdiction. Each of these downward relationships is derived rather than filed: resolved by matching entities across the registry network, not stated directly in a single document.
Those 6 subsidiaries span United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Three of the 6 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
MADISON DEARBORN PARTNERS, LLC
United States
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Frequently Asked Questions
Who is MADISON DEARBORN PARTNERS, LLC's UBO (Ultimate Beneficial Owner)?
No Ultimate Beneficial Owner (UBO) data is recorded for MADISON DEARBORN PARTNERS, LLC; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.
What is MADISON DEARBORN PARTNERS, LLC's company registration number?
MADISON DEARBORN PARTNERS, LLC's registration number is L00261815, filed with Illinois Secretary of State in United States. Its current status on the register is active.
Is MADISON DEARBORN PARTNERS, LLC still an active company?
MADISON DEARBORN PARTNERS, LLC's status on Illinois Secretary of State is listed as active.
When was MADISON DEARBORN PARTNERS, LLC incorporated?
MADISON DEARBORN PARTNERS, LLC was incorporated on 23 February 1999, according to Illinois Secretary of State.
What is MADISON DEARBORN PARTNERS, LLC's registered address?
The registered address on file for MADISON DEARBORN PARTNERS, LLC is CHICAGO, United States.
What legal structure is MADISON DEARBORN PARTNERS, LLC registered as?
MADISON DEARBORN PARTNERS, LLC is registered as a Private limited company (Ltd.) in United States.
Who are the officers/directors of MADISON DEARBORN PARTNERS, LLC?
Three officers are currently on record for MADISON DEARBORN PARTNERS, LLC, filed with Illinois Secretary of State. Samuel M. Mencoff, Paul Finnegan and Samuel Mencoff all serve as Manager.
Does MADISON DEARBORN PARTNERS, LLC have a parent company or subsidiaries?
MADISON DEARBORN PARTNERS, LLC has no recorded parent company — it sits at the top of its own group structure, with 6 subsidiaries recorded beneath it across 1 jurisdiction. Those 6 subsidiaries span United States jurisdiction, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Three of the 6 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
Can Zavia monitor changes to MADISON DEARBORN PARTNERS, LLC's ownership over time?
This profile reflects a point-in-time snapshot from Illinois Secretary of State. Zavia's monitoring API can track changes to MADISON DEARBORN PARTNERS, LLC's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access MADISON DEARBORN PARTNERS, LLC's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United States, so records like MADISON DEARBORN PARTNERS, LLC's registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Illinois Secretary of State and was last synced on 13 October 2026.