AltMountain

Marylebone Partners LLP

London, United Kingdom · CRD 168426
Hedge fund managerExempt reporting

Marylebone Partners LLP is an exempt reporting adviser based in London, United Kingdom that reports managing 1 hedge fund on Form ADV. Its private funds, of all types, hold $597.4 million in gross assets.

Regulatory assets under management
—Form ADV Item 5.F
Gross assets of private funds
$597.4 millionAll private fund types, Form ADV
Hedge funds managed
14 private funds in total
Employees
—Form ADV Item 5.A
Registration
Exempt reporting adviserCRD 168426
Latest Form ADV
06/23/2026Disciplinary disclosures: none reported

Hedge funds filing Form D (2)

Matched to this firm by the fund names and related persons in each Form D. The list may be incomplete.

Private funds reported on Form ADV (2)

Fund
Gross assets
Minimum
Owners
Adviser
The Marylebone Lane Master Fund
Cayman IslandsHedge fund
Gross assets$218M
Minimum$1.0
Owners2
AdviserMarylebone Partners LLP
The Portman Square Fund LP
Delaware, United StatesPrivate fund
Gross assets$15.7M
Minimum$15.0M
Owners2
AdviserMarylebone Partners LLP

As reported in the adviser's Form ADV filed Jun 27, 2024. Funds also listed from Form D are shown above.

Fund vehicles: feeder funds and single-deal vehicles (2)

Fund
Gross assets
Minimum
Owners
Adviser
The Marylebone Lane Fund
Cayman IslandsPrivate fund
Gross assets$340M
Minimum$1.0M
Owners83
AdviserMarylebone Partners LLP
The Marylebone Lane Fund LP
Delaware, United StatesPrivate fund
Gross assets$34.6M
Minimum$1.0M
Owners8
AdviserMarylebone Partners LLP

Feeder funds invest through a master fund; single-deal vehicles (SPVs, co-investments, series) hold one investment.

From SEC filings. Firm data comes from the SEC's Form ADV data as of Oct 2, 2026; performance estimates come from Form 13F. AltMountain has not verified this information, and it is not an offer, solicitation or recommendation. Full disclosures