Investment adviser · CRD 298999

CASTLE ISLAND VENTURES

Exempt reporting adviser (ERA)

Exempt reporting advisers use a shorter Form ADV report. Some adviser-level figures are not reported; fund disclosures appear below when available.

CASTLE ISLAND MANAGEMENT, LLC

BOSTON, MA, United States · Form ADV filed Mar 31, 2026

Adviser-level assets, account counts and staffing figures are unavailable in this filing. View the reported fund disclosures below →

Private funds & service providers

18 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.

CASTLE ISLAND VENTURES III, L.P.Venture Capital Fund · Last reported Mar 31, 2026$214MGross asset value

Form D fundraising filings

Castle Island Ventures III, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian ANCHORAGE DIGITAL BANK N.A. SIOUX FALLS, South Dakota, United States Related to adviser: No
Custodian FIDELITY DIGITAL ASSET SERVICES BOSTON, Massachusetts, United States Related to adviser: No
Custodian FIREBLOCKS TRUST COMPANY, LLC NEW YORK, New York, United States Related to adviser: No
Custodian FIRST CITIZENS BANK & TRUST COMPANY RALEIGH, North Carolina, United States Related to adviser: No
Custodian LEADER BANK ARLINGTON, 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

CBIZ CPAS P.C.
PCAOB 199

Fund details & source
Fund ID
805-9215361783
Reported beneficial owners
127
Minimum commitment
$0
Form D file number
021-431022

Form ADV 2079262 · Mar 31, 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.

CASTLE ISLAND VENTURES III-A, L.P.Venture Capital Fund · Last reported Mar 31, 2026$146MGross asset value

Form D fundraising filings

Castle Island Ventures III-A, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian ANCHORAGE DIGITAL BANK N.A. SIOUX FALLS, South Dakota, United States Related to adviser: No
Custodian FIDELITY DIGITAL ASSET SERVICES BOSTON, Massachusetts, United States Related to adviser: No
Custodian FIREBLOCKS TRUST COMPANY, LLC NEW YORK, New York, United States Related to adviser: No
Custodian FIRST CITIZENS BANK & TRUST COMPANY RALEIGH, North Carolina, United States Related to adviser: No
Custodian LEADER BANK ARLINGTON, 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

CBIZ CPAS P.C.
PCAOB 199

Fund details & source
Fund ID
805-7979703987
Reported beneficial owners
68
Minimum commitment
$0
Form D file number
021-430999

Form ADV 2079262 · Mar 31, 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.

CASTLE ISLAND VENTURES IV, LPVenture Capital Fund · Last reported Mar 31, 2026$143MGross asset value

Form D fundraising filings

Castle Island Ventures IV, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian CITIZENS PRIVATE BANK RIVERSIDE, Rhode Island, 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

CBIZ CPAS P.C.
PCAOB 199

Fund details & source
Fund ID
805-9934911948
Reported beneficial owners
89
Minimum commitment
$0
Form D file number
021-559173

Form ADV 2079262 · Mar 31, 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.

CASTLE ISLAND VENTURES I, L.P.Venture Capital Fund · Last reported Mar 31, 2026$135MGross asset value

Form D fundraising filings

Castle Island Ventures I, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian ANCHORAGE DIGITAL BANK N.A. SIOUX FALLS, South Dakota, United States Related to adviser: No
Custodian FIDELITY DIGITAL ASSET SERVICES BOSTON, Massachusetts, United States Related to adviser: No
Custodian FIREBLOCKS TRUST COMPANY, LLC NEW YORK, New York, United States Related to adviser: No
Custodian FIRST CITIZENS BANK & TRUST COMPANY RALEIGH, North Carolina, United States Related to adviser: No
Custodian LEADER BANK ARLINGTON, Massachusetts, United States Related to adviser: No
Custodian RAYMOND JAMES & ASSOCIATES, INC. HUNT VALLEY, Maryland, 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

CBIZ CPAS P.C.
PCAOB 199

RAYMOND JAMES & ASSOCIATES, INC.
SEC 8-10999

Fund details & source
Fund ID
805-3409961436
Reported beneficial owners
47
Minimum commitment
$0
Form D file number
021-315148

Form ADV 2079262 · Mar 31, 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.

CASTLE ISLAND VENTURES II, L.P.Venture Capital Fund · Last reported Mar 31, 2026$30.6MGross asset value

Form D fundraising filings

Castle Island Ventures II, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian ANCHORAGE DIGITAL BANK N.A. SIOUX FALLS, South Dakota, United States Related to adviser: No
Custodian FIDELITY DIGITAL ASSET SERVICES BOSTON, Maryland, United States Related to adviser: No
Custodian FIREBLOCKS TRUST COMPANY, LLC NEW YORK, New York, United States Related to adviser: No
Custodian FIRST CITIZENS BANK & TRUST COMPANY RALEIGH, North Carolina, United States Related to adviser: No
Custodian LEADER BANK ARLINGTON, Massachusetts, United States Related to adviser: No
Custodian RAYMOND JAMES & ASSOCIATES, INC. HUNT VALLEY, Maryland, 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

CBIZ CPAS P.C.
PCAOB 199

RAYMOND JAMES & ASSOCIATES, INC.
SEC 8-10999

Fund details & source
Fund ID
805-5229672211
Reported beneficial owners
62
Minimum commitment
$0
Form D file number
021-369479

Form ADV 2079262 · Mar 31, 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.

CASTLE ISLAND VENTURES IV FEEDER, LPVenture Capital Fund · Last reported Mar 31, 2026$26.1MGross asset value

Form D fundraising filings

Castle Island Ventures IV Feeder, L.P.

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Auditor CBIZ CPAS P.C. BOSTON, Massachusetts, United States
Custodian CITIZENS PRIVATE BANK RIVERSIDE, Rhode Island, 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

CBIZ CPAS P.C.
PCAOB 199

Fund details & source
Fund ID
805-6016156300
Reported beneficial owners
11
Minimum commitment
$0
Form D file number
021-562621

Form ADV 2079262 · Mar 31, 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.

CIV OPPORTUNITY SERIES CO-INVEST I, L.P. - (SERIES 9)Venture Capital Fund · Last reported Mar 31, 2026$25.9MGross asset value

Form D fundraising filings

CIV Opportunity Series Co-Invest I, L.P. - (Series 9)

Fund administrator JUNIPER SQUARE SAN FRANCISCO, California, United States Investor statements: Yes (provided to all investors) Related to adviser: No
Custodian FIRST CITIZENS BANK & TRUST COMPANY RALEIGH, North Carolina, United States Related to adviser: No
Provider details
Annual audit
No
Prime brokers
No
Custodians
Yes
Administrator other than the adviser
Yes
External marketing
No
Fund details & source
Fund ID
805-2798828456
Reported beneficial owners
5
Minimum commitment
$0
Form D file number
021-439837

Form ADV 2079262 · Mar 31, 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.

Services & filing details

Most recent filing: Mar 31, 2026. View historical filings

Reported services

Not reported in these imported fields

Compensation

Not reported in these imported fields

Principal office

374 CONGRESS STREET, SUITE 301
BOSTON, MA, 02210, United States

CRD 298999

Filing source

Form ADV 2079262 · Mar 31, 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.