Castle Island Ventures
Boston, MA · CRD 298999
Venture capital managerExempt reporting
Castle Island Ventures is an exempt reporting adviser based in Boston, MA that reports managing 16 private funds on Form ADV, including 16 venture capital funds. Its private funds hold $789.9 million in gross assets.
- Regulatory assets under management
- —Form ADV Item 5.F
- Gross assets of private funds
- $789.9 millionAll private fund types, Form ADV
- Private funds managed
- 16PE 0 · VC 16 · hedge 0
- Employees
- —Form ADV Item 5.A
- Registration
- Exempt reporting adviserCRD 298999
- Latest Form ADV
- 03/31/2026Disciplinary disclosures: none reported
Venture capital funds filing Form D (2)
Fund
First sale
Raised
Investors
Minimum
Offering
Castle Island Ventures IV Feeder, L.P.
Boston, MA
First sale—
Raised$0
Investors0
MinimumNone set
Offering506(b)
Castle Island Ventures IV, L.P.
Boston, MA
First sale—
Raised$0
Investors0
MinimumNone set
Offering506(b)
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 (6)
Fund
Gross assets
Minimum
Owners
Adviser
Castle Island Ventures I, L.P.
Delaware, United StatesVenture capital fund
Gross assets$168M
MinimumNone set
Owners93
AdviserCastle Island Management, LLC
Castle Island Ventures III, L.P.
Delaware, United StatesVenture capital fund
Gross assets$146M
MinimumNone set
Owners153
AdviserCastle Island Management, LLC
Castle Island Ventures III-A, L.P.
Delaware, United StatesVenture capital fund
Gross assets$100M
MinimumNone set
Owners69
AdviserCastle Island Management, LLC
Castle Island Ventures II, L.P.
Delaware, United StatesVenture capital fund
Gross assets$34.5M
MinimumNone set
Owners65
AdviserCastle Island Management, LLC
Castle Island Ventures II-A, L.P.
Delaware, United StatesVenture capital fund
Gross assets$23.1M
MinimumNone set
Owners85
AdviserCastle Island Management, LLC
Castle Island Ventures I-A, L.P.
Delaware, United StatesVenture capital fund
Gross assets$14.3M
MinimumNone set
Owners17
AdviserCastle Island Management, LLC
As reported in the adviser's Form ADV filed Mar 29, 2024. Funds also listed from Form D are shown above.
Fund vehicles: feeder funds and single-deal vehicles (10)
Fund
Gross assets
Minimum
Owners
Adviser
CIV Opportunity Series Co-Invest I, L.P. - (Series 4)
Delaware, United StatesVenture capital fund
Gross assets$18.8M
MinimumNone set
Owners25
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 9)
Delaware, United StatesVenture capital fund
Gross assets$9.0M
MinimumNone set
Owners5
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 6)
Delaware, United StatesVenture capital fund
Gross assets$7.3M
MinimumNone set
Owners13
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 8)
Delaware, United StatesVenture capital fund
Gross assets$6.8M
MinimumNone set
Owners10
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 7)
Delaware, United StatesVenture capital fund
Gross assets$6.5M
MinimumNone set
Owners19
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 3)
Delaware, United StatesVenture capital fund
Gross assets$4.6M
MinimumNone set
Owners11
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 5)
Delaware, United StatesVenture capital fund
Gross assets$2.0M
MinimumNone set
Owners70
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 10)
Delaware, United StatesVenture capital fund
Gross assets$458K
MinimumNone set
Owners3
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 1)
Delaware, United StatesVenture capital fund
Gross assets$0
MinimumNone set
Owners0
AdviserCastle Island Management, LLC
CIV Opportunity Series Co-Invest I, L.P. - (Series 2)
Delaware, United StatesVenture capital fund
Gross assets$0
MinimumNone set
Owners0
AdviserCastle Island Management, LLC
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. AltMountain has not verified this information, and it is not an offer, solicitation or recommendation. Full disclosures