DFX Intelligence
Venture Capital Intelligence
Firms, funds, partners, companies and rounds from sworn filings, firm sites and announcements, kept as a graph with a date and a source on every edge. Facts, inferences and estimates are labelled as such. A fund target is never a close, GAV is never dry powder, and a round size is never an investor’s check.
Firms / Castle Island Management, LLC
Castle Island Management, LLC
Castle Island Ventures is a venture capital firm investing in public blockchain startups. Explore our mission and portfolio.
venture manager, reported GAV $542M across 18 vehicles
Importance
48
elevated
Active deployment
55
elevated
Emerging
0
low
Completeness
81
high
Freshness
100
high
Research priority
18
moderate
Identity and regulatory footprint
- Headquarters
- Boston, MAadviserinfo.sec.gov
- Office address
- 374 CONGRESS STREET, SUITE 301, Boston, MA, 02210adviserinfo.sec.gov
- Business phone
- 508-202-0432adviserinfo.sec.gov
- Website
- http://www.castleisland.vc
- SEC adviser type
- exempt reporting adviseradviserinfo.sec.gov
- SEC exemption claimed
- venture capital fund adviseradviserinfo.sec.govItem 2.B(1): advises solely venture capital funds
- Latest Form ADV
- Mar 31, 2026
- Private funds reported
- 16 (16 venture capital funds)adviserinfo.sec.gov
- Private fund gross assets
- $790Madviserinfo.sec.govreported GAV of the funds, the adviser's own number; not fund size, not dry powder
- business email
- info@castleisland.vccastleisland.vcpublished by the subject
- business phone
- 508-202-0432adviserinfo.sec.govpublished by the subject
Stated thesis versus observed behaviour
13 observed deals
Stated (the firm’s website)
- Sectors
- crypto
- Stages
- early
- Geography
- not stated
- Check size
- not stated; DFX does not estimate checks from round sizes
- Self-described
- venture capital
Observed (from deals on record)
Stage at participation
seed 50%series a 50%
Stage at first entry
seed 50%series a 50%
Sectors
unknown 92%Other Technology 8%
lead rate 75%follow-on rate 0%new logos, 12 months 13
Funds and vehicles
18 reported
| Vehicle | Type | Vintage | Lifecycle | Reported GAV | Owners | Form D sold | Latest Form D |
|---|---|---|---|---|---|---|---|
| CIV Opportunity Series Co-Invest I, L.P. - (series 9) | SPV or co-invest vehicle | 2023 adv first reported | Active deployment | $9.0M Mar 29, 2024 | 5 | $0 | Mar 31, 2022 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 8) | SPV or co-invest vehicle | 2023 adv first reported | Active deployment | $6.8M Mar 29, 2024 | 10 | $0 | Mar 28, 2022 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 10) | SPV or co-invest vehicle | 2023 adv first reported | Active deployment | $457,713 Mar 29, 2024 | 3 | unknown | unknown |
| Castle Island Ventures III, L.P. | Fund | 2022 adv first reported | Active deployment | $146M Mar 29, 2024 | 153 | $0 | Jan 27, 2022 |
| Castle Island Ventures Iii-A, L.P. | Feeder or parallel | 2022 adv first reported | Active deployment | $100M Mar 29, 2024 | 69 | $0 | Jan 27, 2022 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 4) | SPV or co-invest vehicle | 2022 adv first reported | Active deployment | $18.8M Mar 29, 2024 | 25 | $0 | Jul 30, 2021 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 6) | SPV or co-invest vehicle | 2022 adv first reported | Active deployment | $7.3M Mar 29, 2024 | 13 | $0 | Oct 13, 2021 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 7) | SPV or co-invest vehicle | 2022 adv first reported | Active deployment | $6.5M Mar 29, 2024 | 19 | $0 | Dec 22, 2021 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 3) | SPV or co-invest vehicle | 2022 adv first reported | Active deployment | $4.6M Mar 29, 2024 | 11 | $0 | Mar 29, 2021 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 5) | SPV or co-invest vehicle | 2022 adv first reported | Active deployment | $2.0M Mar 29, 2024 | 70 | $0 | Aug 24, 2021 |
| Castle Island Ventures II, L.P. | Fund | 2021 adv first reported | Mature | $34.5M Mar 29, 2024 | 65 | $0 | Jun 23, 2020 |
| Castle Island Ventures Ii-A, L.P. | Feeder or parallel | 2021 adv first reported | Mature | $23.1M Mar 29, 2024 | 85 | $0 | Jun 23, 2020 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 2) | SPV or co-invest vehicle | 2021 adv first reported | Mature | $0 Mar 29, 2024 | 0 | $0 | Feb 24, 2021 |
| CIV Opportunity Series Co-Invest I, L.P. - (series 1) | SPV or co-invest vehicle | 2021 adv first reported | Mature | $0 Mar 29, 2024 | 0 | $0 | Jul 28, 2020 |
| Castle Island Ventures I, L.P. | Fund | unknown | Unknown | $168M Mar 29, 2024 | 93 | $0 | Jun 21, 2018 |
| Castle Island Ventures I-A, L.P. | Feeder or parallel | unknown | Unknown | $14.3M Mar 29, 2024 | 17 | $0 | Aug 14, 2018 |
| Castle Island Ventures IV, L.P. | Fund | unknown | Fundraising | unknown | unknown | $0 | Sep 29, 2025 |
| Castle Island Ventures IV Feeder, L.P. | Feeder or parallel | unknown | Fundraising | unknown | unknown | $0 | Oct 30, 2025 |
GAV is the gross asset value the adviser reported on Form ADV for the vehicle, never the fund’s committed size and never dry powder. Form D sold is the amount sold as of the latest filing, never a final close.
Investment team
16 current, 0 departed
NIC Carter
General partnerGeneral Partner
Rich Sgalardi
General partnerGeneral Partner
Sean Judge
General partnerGeneral Partner
Sean Judge
General partnerGeneral Partner
Matthew P Walsh
Managing partnerManaging Member · since May 1, 2018
Matthew Walsh
Managing partnerFounding Partner
Nic Carter
Managing partnerFounding Partner
Nicolas Elliott Carter
Managing partnerManaging Member · since Jul 1, 2021
Sean Michael Judge
Managing partnerManaging Member · since Jan 1, 2023
Andrew Brochu
Platform and operationsController
Gretchen Marie Mccarey
Platform and operationsChief Financial Officer · since Feb 1, 2022
Gretchen McCarey
Platform and operationsChief Financial Officer
Gus Coldebella
Platform and operationsChief Legal Officer
Laura Lentz
Platform and operationsExecutive Assistant
Hunter Merghart
Venture partnerVenture Partner
Ria Bhutoria
Venture partnerVenture Partner
Investments on record
13 edges, 13 companies, 2 partner-attributed
“This investor” is the amount disclosed for this investor alone; it is unknown unless a source said it. The round size is the whole round.
Co-investors
29 relationships from shared deals, counted for the whole firm
Haun Ventures Management LP 2 shared · recurringVariant 2 shared · recurring · we led 1Coinbase Ventures 2 shared · recurring · we led 1Andreessen Horowitz 1 shared · one time · they led 1Newtopia Vc 1 shared · one timeCore Venture Capital 1 shared · one timeCNK Equity Partners I, LLC 1 shared · one timeQED Investors, LLC 1 shared · one timeParade Ventures Management, LLC 1 shared · one timeDorm Room Fund 1 shared · one timeSwitch Venture Management, LLC 1 shared · one timeRaptor Capital Management LP 1 shared · one timeChemistry Ventures Management, LLC 1 shared · one time2048 Ventures, LLC 1 shared · one timeElectric Capital Partners, LLC 1 shared · one timeNotation Capital Management, LLC 1 shared · one timeBalerion Space Ventures 1 shared · one timeCircle 1 shared · one timeLasagna Ventures 1 shared · one timeNava Ventures, LLC 1 shared · one time · they led 1PayTech Ventures 1 shared · one timeLattice Fund 1 shared · one time · we led 1Nascent Ventures 1 shared · one time · we led 1FIN Capital 1 shared · one time · we led 1Nebular Management, LLC 1 shared · one time · we led 1Quantonation 1 shared · one time · we led 1Satstreet Ventures 1 shared · one time · we led 1Formation 8 1 shared · one time · we led 1Strobe Ventures 1 shared · one time · we led 1
Limited partners
0 disclosed
No LP commitment on record. An LP edge needs a public disclosure with a quote: a pension report (see Limited partners for the plans read), a fund announcement naming the LP, or a Form ADV owner. The fund page carries the LP’s reported performance.
Timeline
20 dated events
- Mar 29, 2023CIV Opportunity Series Co-Invest I, L.P. - (series 9) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $9,033,971Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 9)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 29, 2023CIV Opportunity Series Co-Invest I, L.P. - (series 10) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $450,000Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 10)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 29, 2023CIV Opportunity Series Co-Invest I, L.P. - (series 8) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $6,832,251Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 8)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Jan 1, 2023Sean Michael Judge joined Schedule A of Castle Island Management, LLC as Managing Member
- Mar 31, 2022CIV Opportunity Series Co-Invest I, L.P. - (series 6) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $7,279,161Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 6)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022CIV Opportunity Series Co-Invest I, L.P. - (series 7) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $6,548,992Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 7)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022CIV Opportunity Series Co-Invest I, L.P. - (series 5) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $2,499,843Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 5)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022CIV Opportunity Series Co-Invest I, L.P. - (series 3) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $1,503,239Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 3)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022Castle Island Ventures Iii-A, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $98,000,000Fund first reported on Form ADVFundsFactCastle Island Ventures Iii-A, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022Castle Island Ventures III, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $152,000,000Fund first reported on Form ADVFundsFactCastle Island Ventures III, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 31, 2022CIV Opportunity Series Co-Invest I, L.P. - (series 4) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $18,820,378Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 4)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Feb 1, 2022Gretchen Marie Mccarey joined Schedule A of Castle Island Management, LLC as Chief Financial Officer
- Jul 1, 2021Nicolas Elliott Carter joined Schedule A of Castle Island Management, LLC as Managing Member
- Mar 11, 2021CIV Opportunity Series Co-Invest I, L.P. - (series 2) first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $1,400,000Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 2)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 11, 2021Castle Island Ventures Ii-A, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $20,525,000Fund first reported on Form ADVFundsFactCastle Island Ventures Ii-A, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 11, 2021CIV Opportunity Series Co-Invest I, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $3,000,000Fund first reported on Form ADVFundsFactCIV Opportunity Series Co-Invest I, L.P. - (series 1)SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Mar 11, 2021Castle Island Ventures II, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $29,775,000Fund first reported on Form ADVFundsFactCastle Island Ventures II, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Oct 12, 2018Castle Island Ventures I, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $27,350,000Fund first reported on Form ADVFundsFactCastle Island Ventures I, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Oct 12, 2018Castle Island Management, LLC first filed Form ADV (ERA, venture capital fund adviser exemption)First SEC adviser filingOrganizationFactSEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
- Oct 12, 2018Castle Island Ventures I-A, L.P. first reported on Form ADV by Castle Island Management, LLC (Venture Capital Fund), GAV $2,100,000Fund first reported on Form ADVFundsFactCastle Island Ventures I-A, L.P.SEC Form ADV filing data 2011 to 2024 (every filing, Schedule D 7.B.(1) private funds, Schedules A/B)
Classification history
- Sep 15, 2026Institutional venture firm (confirmed, 95%, cls-1)venture manager, reported GAV $542M across 18 vehicles
- Sep 12, 2026Institutional venture firm (confirmed, 95%, cls-1)venture manager, reported GAV $542M across 17 vehicles
- Sep 12, 2026Institutional venture firm (confirmed, 95%, cls-1)venture manager, reported GAV $542M across 15 vehicles
Evidence
50 observations from 3 sources