MARINER INVESTMENT GROUP, LLC: Investment Adviser Form ADV Filing

How this adviser has changed

Annual filings

Regulatory assets under management

Up to five fiscal years, using the latest annual update available at the selected filing date. Asset changes can reflect acquisitions, client flows, and valuations; they are not investment returns.

Annual adviser history and sources
Fiscal year	Regulatory AUM	Employees	Filed
2021	$201,250,850,921	111	Mar 31, 2022
2022	$180,493,766,178	117	Mar 29, 2023
2023	$126,022,034,338	126	Mar 28, 2024
2024	$119,844,000,000	134	Feb 28, 2025
2025	$149,623,092,189	146	Mar 31, 2026

Who they report serving

Form ADV · Item 5.D

Client types and their share of reported regulatory assets.

Client type	Clients	Regulatory assets	Share of AUM
Pooled investment vehicles	34	$127,217,602,356	72.2%
Sovereign wealth & foreign institutions	Fewer than 5	$41,912,084,560	23.8%
Investment companies	2	$4,396,190,611	2.5%
Retirement plans	Fewer than 5	$2,782,251,124	1.6%

Filing source

Form ADV 2121461 · Aug 28, 2026 · Item 5.D

Reported by MARINER INVESTMENT GROUP, LLC (CRD 124744).

Other-Than Anual Amendment For Registered Adviser.

Official IAPD profile (latest public filing). Historical values on this page come from the SEC/IAPD filing archive; the public profile may show a newer filing.

Private funds & service providers

1 selected fund records

Largest reported gross asset value first; unreported values last. Gross asset value is fund-level disclosure, distinct from adviser AUM and Form D fundraising. Master and feeder funds may overlap.

View all funds in this filing

MARINER ATLANTIC MULTI-STRATEGY MASTER FUND, LTD.Hedge Fund · Master$33.2BGross asset value

Form D fundraising filings

View filings for the issuers linked by this fund’s reported Form D file numbers.

Fund administrator MUFG FUND SERVICES CAYMAN LIMITED HALIFAX, Canada Investor statements: Yes (provided to all investors) Related to adviser: No Other funds reporting this name →

Auditor KPMG LLP STAMFORD, Connecticut, United States Other funds reporting this name →

Custodian BNP PARIBAS SECURITIES CORP. NEW YORK, New York, United States Related to adviser: No Other funds reporting this name →

Custodian BNY MELLON CAPITAL MARKETS, LLC NEW YORK, New York, United States Related to adviser: No Other funds reporting this name →

Custodian J.P. MORGAN SECURITIES LLC NEW YORK, New York, United States Related to adviser: No Other funds reporting this name →

Custodian SG AMERICAS SECURITIES, LLC NEW YORK, New York, United States Related to adviser: No Other funds reporting this name →

See filing for more → Showing the first 6 providers by role and name. IAPD may show a newer filing.

Provider details

Annual audit: Yes
Prime brokers: Yes
Custodians: Yes
Administrator other than the adviser: Yes
External marketing: Yes

KPMG LLP
PCAOB 185

BNP PARIBAS SECURITIES CORP.
SEC 8-32682

BNY MELLON CAPITAL MARKETS, LLC
SEC 8-35255

J.P. MORGAN SECURITIES LLC
SEC 8-35008

SG AMERICAS SECURITIES, LLC
SEC 8-66125

Fund details & source

Fund ID: 805-4991304990
Reported beneficial owners: 561
Minimum commitment: $5M
Form D file number: 021-126777
Form D file number: 021-127002
Form D file number: 021-121432

Form ADV 2121461 · Aug 28, 2026 · Schedule D 7.B.(1)

Reported by MARINER INVESTMENT GROUP, LLC (CRD 124744).

Other-Than Anual Amendment For Registered Adviser.

Official IAPD profile (latest public filing). Historical values on this page come from the SEC/IAPD filing archive; the public profile may show a newer filing.

Services & filing details

View a filing

Showing values from the selected filing. Latest observed filing does not establish current registration status.

What changed?

Since Mar 31, 2026 · previous imported filing

Regulatory AUM$149,623,092,189 → $176,308,128,651
Client accounts37 → 39
Employees146 → 176

Filing source

Form ADV 2121461 · Aug 28, 2026 · Items 1 & 5

Reported by MARINER INVESTMENT GROUP, LLC (CRD 124744).

Other-Than Anual Amendment For Registered Adviser.

Official IAPD profile (latest public filing). Historical values on this page come from the SEC/IAPD filing archive; the public profile may show a newer filing.

Management of assets

Discretionary: $176B
Non-discretionary: $0

Reported services

Investment company portfolio management · Pooled investment vehicle management · Business portfolio management

Compensation

Percentage of assets · Performance-based

Principal office

299 PARK AVENUE, 5TH FLOOR
NEW YORK, NY, 10171, United States

CRD 124744

Filing source

Form ADV 2121461 · Aug 28, 2026 · Items 1 & 5

Reported by MARINER INVESTMENT GROUP, LLC (CRD 124744).

Other-Than Anual Amendment For Registered Adviser.

Official IAPD profile (latest public filing). Historical values on this page come from the SEC/IAPD filing archive; the public profile may show a newer filing.