Investment adviser · CRD 130585

MAD RIVER INVESTORS

Investment adviser filing (IA)

MRM-HORIZON ADVISORS, LLC

BOSTON, MA, United States · Form ADV filed Jul 7, 2026

Regulatory AUM: $404M
Client accounts: 140
Employees: 6
Advisory professionals: 2

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
High-net-worth individuals	68	$269,207,179	66.7%
Pooled investment vehicles	2	$69,708,458	17.3%
Corporations & businesses	6	$26,439,306	6.6%
Retirement plans	4	$19,495,946	4.8%
Individuals	21	$18,680,859	4.6%

Filing source

Form ADV 2117964 · Jul 7, 2026 · Item 5.D

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

Private funds & service providers

15 Private funds

The count excludes feeder funds. Funds in the latest filing appear first, ordered by reported gross assets. Earlier funds retain their last reported values.

LONG POINT INVESTORS - MAD RIVER MANAGED SERIESHedge Fund · Last reported Jul 7, 2026$68.1MGross asset value

Fund administrator ARTEX FUND SERVICES USA INC CHARLOTTE, North Carolina, United States Investor statements: Yes (provided to all investors) Related to adviser: No

Auditor BDO USA LLP NEW YORK, New York, United States

Custodian FIDELITY BROKERAGE SERVICES LLC BOSTON, Massachusetts, United States Related to adviser: No

Custodian FIRST CITIZEN BANK (FORMERLY SVB AND BOSTON PRIVATE BANK) BOSTON, Massachusetts, United States Related to adviser: No

Custodian PERSHING LLC JERSEY CITY, New Jersey, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: Yes
External marketing: No

BDO USA LLP
PCAOB 243

FIDELITY BROKERAGE SERVICES LLC
SEC 8-23292

PERSHING LLC
SEC 8-17574

Fund details & source

Fund ID: 805-7961592334
Reported beneficial owners: 31
Minimum commitment: $250K
Form D file number: 021-88656

Form ADV 2117964 · Jul 7, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS SERIES CHedge Fund · Last reported Jul 7, 2026$1.63MGross asset value

Fund administrator ARTEX FUND SERVICES USA INC CHARLOTTE, North Carolina, United States Investor statements: Yes (provided to all investors) Related to adviser: No

Auditor BDO USA LLP NEW YORK, New York, United States

Custodian FIDELITY BROKERAGE SERVICES LLC BOSTON, Massachusetts, United States Related to adviser: No

Custodian FIRST CITIZEN BANK (FORMERLY SVB AND BOSTON PRIVATE BANK) BOSTON, Massachusetts, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: Yes
Administrator other than the adviser: Yes
External marketing: No

BDO USA LLP
PCAOB 243

FIDELITY BROKERAGE SERVICES LLC
SEC 8-23292

Fund details & source

Fund ID: 805-2838526538
Reported beneficial owners: 23
Minimum commitment: $25K
Form D file number: 021-88656

Form ADV 2117964 · Jul 7, 2026 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS - PERSHING SQUARE, L.P. SERIESHedge Fund · Last reported Mar 30, 2017$6MGross asset value

Auditor BDO USA LLP NEW YORK, New York, United States

Marketer RIM SECURITIES LLC NEW YORK, New York, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: No
Administrator other than the adviser: No
External marketing: Yes

RIM SECURITIES LLC
CRD 18466 · SEC 8-36759

Fund details & source

Fund ID: 805-7802246875
Reported beneficial owners: 12
Minimum commitment: $250K
Form D file number: 021-88656

Form ADV 1097533 · Mar 30, 2017 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS - ABRAMS BISON, L.P. SERIESHedge Fund · Last reported Mar 30, 2017$5.62MGross asset value

Auditor BDO USA LLP NEW YORK, New York, United States

Marketer RIM SECURITIES LLC NY, New York, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: No
Administrator other than the adviser: No
External marketing: Yes

RIM SECURITIES LLC
CRD 18466 · SEC 8-36759

Fund details & source

Fund ID: 805-6325713614
Reported beneficial owners: 11
Minimum commitment: $250K
Form D file number: 021-88656

Form ADV 1097533 · Mar 30, 2017 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS WEXFORD 10 SERIESPrivate Equity Fund · Last reported Mar 28, 2013$4.44MGross asset value

Auditor BDO USA LLP NEW YORK, New York, United States

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: No
Administrator other than the adviser: No
External marketing: No

Fund details & source

Fund ID: 805-9092434096
Reported beneficial owners: 15
Minimum commitment: $0
Form D file number: 021-88656

Form ADV 718580 · Mar 28, 2013 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS - SILVER POINT CAPITAL FUND, L.P. SERIESHedge Fund · Last reported Mar 29, 2018$3.81MGross asset value

Fund administrator HORSESHOE FUND GROUP CHARLOTTE, North Carolina, United States Investor statements: Yes (provided to all investors) Related to adviser: No

Auditor BDO USA LLP NEW YORK, New York, United States

Marketer RIM SECURITIES LLC NEW YORK, New York, United States Related to adviser: No

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: No
Administrator other than the adviser: Yes
External marketing: Yes

BDO USA LLP
PCAOB 243

RIM SECURITIES LLC
CRD 18466 · SEC 8-36759

Fund details & source

Fund ID: 805-6032959624
Reported beneficial owners: 4
Minimum commitment: $250K
Form D file number: 021-88656

Form ADV 1190677 · Mar 29, 2018 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

LONG POINT INVESTORS - APPALOOSA INVESTMENT LIMITED PARTNERSHIP I SERIESHedge Fund · Last reported Mar 27, 2019$3.81MGross asset value

Fund administrator HORSESHOE FUND GROUP CHARLOTTE, North Carolina, United States Investor statements: Yes (provided to all investors) Related to adviser: No

Auditor BDO USA LLP NEW YORK, New York, United States

Provider details

Annual audit: Yes
Prime brokers: No
Custodians: No
Administrator other than the adviser: Yes
External marketing: No

BDO USA LLP
PCAOB 243

Fund details & source

Fund ID: 805-5346825238
Reported beneficial owners: 13
Minimum commitment: $250K
Form D file number: 021-88656

Form ADV 1298373 · Mar 27, 2019 · Schedule D 7.B.(1)

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

Services & filing details

Most recent filing: Jul 7, 2026. View historical filings

Reported services

Individual portfolio management · Pooled investment vehicle management · Business portfolio management · Selection of other advisers

Compensation

Percentage of assets · Performance-based

Principal office

84 STATE STREET, SUITE 1060
BOSTON, MA, 02109, United States

CRD 130585

Filing source

Form ADV 2117964 · Jul 7, 2026 · Items 1 & 5

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.