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Castle Island Ventures

1 Broadway Ste 16, Cambridge, Massachusetts, 02142, United States

Overview

Venture capital firm focused on public blockchain investments.

Founded

2018

Deals · 12mo

11

Links

WebsiteLinkedInX (Twitter)

Stage focus

Seed
Series A

Geographic focus

United States

Sector focus

Venture Capital

Investment portfolio

77rounds
NAMEDATESIZE
Félix
Sep 2026Participated
$200 MDebt
Birdai Labs
Jul 2026Led
$4 MSeed
Cyclops
Jul 2026Participated
$20 MSeries A
Valinor
Mar 2026Led
$25 MSeed
XFX
Mar 2026Led
$17 MSeries A
Cyclops
Mar 2026Participated
$8 MOther Equity
Birch Hill Holdings
Feb 2026Led
$3 MSeed
Project Eleven
Jan 2026Led
$20 MSeries A
Gondorfi
Dec 2025Participated
$3 MSeed
Arx Research
Nov 2025Participated
$6 MSeed
Tesser
Oct 2025Led
$5 MSeed
RockSolid
Sep 2025Led
$3 MSeed
Félix
Sep 2026Participated
$200 MDebt
Birdai Labs
Jul 2026Led
$4 MSeed
Cyclops
Jul 2026Participated
$20 MSeries A
Valinor
Mar 2026Led
$25 MSeed
XFX
Mar 2026Led
$17 MSeries A
Cyclops
Mar 2026Participated
$8 MOther Equity
Birch Hill Holdings
Feb 2026Led
$3 MSeed
Project Eleven
Jan 2026Led
$20 MSeries A
Gondorfi
Dec 2025Participated
$3 MSeed
Arx Research
Nov 2025Participated
$6 MSeed
Tesser
Oct 2025Led
$5 MSeed
RockSolid
Sep 2025Led
$3 MSeed
77
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Deal Distribution

Castle Island Ventures: 77 funding rounds are recorded in the selected participation categories.All available history.
Castle Island Ventures: 77 funding rounds are recorded in the selected participation categories. All available history
Round typeLed dealsParticipated deals
Seed1618
Series A713
Series B17
Series C+03
Other Equity010
Debt11

Monthly Deal Activity

Castle Island Ventures: 77 deals are recorded across 98 months.All available history.
Castle Island Ventures: 77 deals are recorded across 98 months. All available history
MonthDeals
Sep '181
Oct '180
Nov '181
Dec '180
Jan '190
Feb '191
Mar '190
Apr '191
May '190
Jun '190
Jul '191
Aug '190
Sep '191
Oct '190
Nov '190
Dec '191
Jan '200
Feb '201
Mar '202
Apr '200
May '200
Jun '201
Jul '200
Aug '201
Sep '200
Oct '200
Nov '200
Dec '200
Jan '210
Feb '211
Mar '212
Apr '210
May '213
Jun '211
Jul '210
Aug '212
Sep '211
Oct '210
Nov '212
Dec '211
Jan '222
Feb '220
Mar '220
Apr '224
May '223
Jun '221
Jul '222
Aug '220
Sep '220
Oct '221
Nov '221
Dec '220
Jan '231
Feb '231
Mar '230
Apr '231
May '232
Jun '230
Jul '230
Aug '230
Sep '230
Oct '230
Nov '230
Dec '234
Jan '240
Feb '240
Mar '241
Apr '242
May '241
Jun '240
Jul '242
Aug '243
Sep '240
Oct '241
Nov '240
Dec '241
Jan '250
Feb '251
Mar '250
Apr '251
May '251
Jun '251
Jul '251
Aug '251
Sep '251
Oct '251
Nov '251
Dec '251
Jan '261
Feb '261
Mar '263
Apr '260
May '260
Jun '260
Jul '262
Aug '260
Sep '261
Oct '260

Sector Breakdown

Castle Island Ventures: Crypto & Blockchain is the largest displayed sector by deal count (53 deals).All available history.

A deal can appear in multiple sectors, so sector totals may overlap. Capital represents disclosed total round sizes, not fund cheque sizes.

Castle Island Ventures: Crypto & Blockchain is the largest displayed sector by deal count (53 deals). All available history
SectorDeals
Crypto & Blockchain53
Fintech39
Networks, Cloud & Communication11
Enterprise Software10
Cybersecurity & Privacy8
Data, Analytics & IT8
Professional Services7
Space & Frontier Tech6
Hardware & Robotics4
Media & Entertainment4
AI & Machine Learning4
Transportation & Logistics3
Education & Workforce1
E-Commerce & Retail1
Clean Energy & Sustainability1
Real Estate & Construction1
Marketing & Advertising1
Developer Tools1

Deal Size Distribution

Castle Island Ventures: 77 rounds have a disclosed size in the displayed size bands.All available history.

Undisclosed round sizes are excluded. Capital represents total round sizes, not fund cheque sizes.

Castle Island Ventures: 77 rounds have a disclosed size in the displayed size bands. All available history
Round size band (USD)Deals
<$5M21
$5M-$10M17
$10M-$25M22
$25M-$50M7
$50M-$100M7
$100M-$250M2
$250M-$500M0
$500M-$1B1
$1B+0

Deals By Geography

Castle Island Ventures: United States has the largest recorded deal count among the displayed regions (65 deals).All available history.

Top 9 of 9 regions; European countries are grouped as Europe.

Castle Island Ventures: United States has the largest recorded deal count among the displayed regions (65 deals). All available history
RegionDeals
United States65
Europe3
Cayman Islands2
Indonesia2
Canada1
Denver1
Israel1
India1
Seychelles1
Castle Island Ventures: 20 co-investors are shown, with CMT Digital sharing 10 recorded deals.All available history.

Co-Investors

Bubble size = shared deals

Click a bubble to open that fund in a new tab.

Shows up to 20 co-investors ranked by shared deals. Deals may be shared with multiple funds, so rows overlap. Capital is total round size, not fund cheque size.

Castle Island Ventures: 20 co-investors are shown, with CMT Digital sharing 10 recorded deals. All available history
Co-investorShared deals
CMT Digital10
Coinbase Ventures10
Polychain Capital9
Avon Ventures6
Hash35
Notation Capital5
Andreessen Horowitz4
Digital Currency Group4
Dragonfly4
DRW Venture Capital4
Fidelity Management & Research Company4
Hack VC4
Illuminate Financial4
Jump Capital4
Pantera Capital4
PayPal Ventures4
Winklevoss Capital4
Alameda Ventures3
Blockchain Capital3
Blockchain.com Ventures3

Investment Strategy

Castle Island Ventures: Led accounts for 32% and participating for 68% of round participation.All available history.
Castle Island Ventures: Led accounts for 32% and participating for 68% of round participation. All available history
CategoryDeals (count)Share (%)
Led2532%
Participating5268%
Castle Island Ventures: Single-lead accounts for 68% and co-led for 32% of lead dynamics.All available history.
Castle Island Ventures: Single-lead accounts for 68% and co-led for 32% of lead dynamics. All available history
CategoryDeals (count)Share (%)
Single-lead1768%
Co-led832%

Team

Hunter Merghart

Venture Partner

Matthew Walsh

Founding Partner

Nic Carter

Founding Partner

Ria Bhutoria

General Partner

Sean Judge

General Partner