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Castle Island Ventures — Portfolio, Page 3

Investor actively backing innovative startups and growth-stage companies across various industries and funding rounds.

106
Companies
$955.1M
Total invested
$11.6M
Avg. check
37
Industries
Blockchain 14Cryptocurrency 9Information Technology 6FinTech 6Web3 4Internet 3+31 more
Founder contacts

Verified emails & LinkedIn for founders across this portfolio.

jane@on●●●●●●●.com
linkedin.com/in/●●●●●●
Verified contacts, updated monthly
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Portfolio companies

Showing 4972 of 106
Friktion Labs
January 2022

Solana’s largest portfolio and risk manager for individuals, DAOs, and Institutional Asset Managers

Blockchain · Austin$5.5M Venture - Series Unknown
Endstate
October 2024

Endstate offers shoes with digital features, enabling customers to avail of a physical product to wear and create a digital twin.

Fashion · West Roxbury$575K Seed
Atrium
October 2025

Atrium is an AI-powered intelligence platform built for investors, analysts, and bankers who need to move fast.

Artificial Intelligence (AI) · Atlanta$4.0M Seed
Tesser
October 2025

Tesser is a low-code blockchain payment solution platform that provides stability coin payments.

Blockchain · Nyack$4.5M Seed
Mint Songs
October 2021

Mint Songs is the largest music NFT marketplace helping music artists build web3 communities

Blockchain · Washington$3.0M Seed
Delta
October 2024

Delta is a fully integrated solution designed from the ground up to eliminate the trade-off between sovereignty.

Blockchain · Zürich$11.0M Seed
Cyclops.io
March 2026

Cyclops.io is a new operating system for team collaboration.

Information Technology · Cambridge$8.0M Seed
Birch Hill Holdings
February 2026

Birch Hill Holdings provides institutional digital asset infrastructure for onchain lending and tokenized asset markets.

Asset Management · West New York$2.5M Pre-Seed
Project Eleven
January 2026

Project Eleven is a development company dedicated to advancing post-quantum cryptography solutions.

Information Technology · New York$20.0M Series A
Build on Bitcoin
November 2025

Build on Bitcoin is a hybrid Layer-2 network Bitcoin blockchain

Bitcoin · George Town$4.2M Undisclosed
ARX
November 2025

ARX smart contracts and HaLo chips enable creators build decentralized, immutable and composable physical crypto assets.

Blockchain · Middletown$6.1M Seed
Alpen Labs
October 2025

Alpen Labs is a startup scaling bitcoin with zero-knowledge technology.

Apps · BrooklynGrant
Stable
September 2025

Stable is a blockchain for digital dollar settlement with gas-free peer transfers.

Blockchain · Carson CitySeries Unknown
XFX
June 2025

XFX makes global money movement fast, transparent, and capital-efficient across fiat and stablecoin rails.

Non-Fungible Token (NFT)$9.1M Seed
Try Your Best
June 2025

Try Your Best is a blockchain technology company.

Blockchain · Tucson$11.0M Series A
Nirvana Labs
May 2025

Nirvana Labs offers cloud solutions designed for blockchain infrastructure and services.

Blockchain · Los Angeles$6.0M Seed
Tally
April 2025

Tally is a frontend for onchain DAOs

Blockchain · New York$8.0M Series A
Félix
April 2025

Félix is ​​a chat-based platform that enables Latinos in the US to send money abroad.

Apps · San Francisco$75.0M Series B
Surus
March 2025

Surus is a platform for the future of finance, built on top of our licensed and regulated financial institution.

Financial Services · Asheville$10.6M Series Unknown
Coala Pay
February 2025

Coala Pay is building better contracting and payments infrastructure for the aid sector.

Financial Services · San Francisco$3.5M Seed
BabylonChain
January 2025

Babylon designs security protocols to leverage security for decentralized systems, allowing features like secure timestamps and staking.

Bitcoin · Palo Alto$5.3M Series Unknown
Kinetic
December 2024

The Future of Exchange

Blockchain · San FranciscoSeed
CAT Labs
December 2024

CAT Labs is working on cybersecurity and digital asset recovery solutions.

Computer · Miami$5.4M Seed
Yellow Card
October 2024

Yellow Card is the largest and first licensed Stablecoin on/off ramp on the African continent

Bitcoin · Atlanta$33.0M Series C

Where Castle Island Ventures invests

Blockchain14
Cryptocurrency9
Information Technology6
FinTech6
Web34
Internet3

About Castle Island Ventures's portfolio

How many companies has Castle Island Ventures invested in?

Castle Island Ventures has invested in 106 companies tracked in our database. The portfolio spans multiple industries and funding stages, from seed-stage startups to late-stage companies.

What industries does Castle Island Ventures invest in?

Castle Island Ventures's top investment sectors include Blockchain, Cryptocurrency, Information Technology, FinTech, Web3. The firm invests across 37 different industry categories.

What is Castle Island Ventures's largest investment?

Among tracked funding rounds, Félix received $75.0M in a Series B round. Castle Island Ventures's total known invested capital is $955.1M.

What is the average investment size for Castle Island Ventures?

Castle Island Ventures's average investment size is $11.6M across its portfolio of 106 companies.

What are Castle Island Ventures's most recent investments?

Recent Castle Island Ventures portfolio additions include Friktion Labs, Endstate, Atrium, Tesser, Mint Songs. These companies were founded in 2020 or later.

Reach the founders behind these 106 companies
Verified emails and LinkedIn profiles, updated monthly.
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