Warburg Serres
San Francisco, CA, 94105, United States
Overview
Warburg Serres Investments is a private equity group investing in blockchain infrastructure projects and Web3 applications.
- Total investments
- 9
- Lead investments
- 0
- Investments · 12mo
- 0
- Active investors
- 2
Investment portfolio
- Calimero Network
Participated · Seed · Jan 2023
Calimero Network provides a SaaS secure private shard infrastructure that lets developers protect their data while leveraging the business benefits of open-source blockchains. Its tech stack includes a console interface, a bridge to communicate between private shards and public networks, privacy features for permissioned private networks, and gas cost reductions. The platform enables users to develop, test and deploy private shards in minutes and to connect to private or public blockchain applications such as DeFi, NFTs and on-chain KYC while retaining confidentiality and access controls. Calimero is interoperable with other enterprises, shards and public blockchains and was spun out of the Near protocol. The company is led by Sandi Fatic and Mario Halambek and is currently in closed alpha. Calimero raised $8.5M in Seed funding and intends to use the proceeds to expand its team and business reach.
- Foundation
Participated · Seed · Dec 2022
Foundation produces Passport Prime, a programmable security device running KeyOS, a Rust microkernel operating system developed over three years. Passport Prime ships with a Bitcoin hardware wallet, FIDO security keys, 2FA storage, a secrets vault, and 50GB of encrypted file storage, and began shipping to pre-order customers in March before opening general availability in May 2026. KeyOS is open source and includes QuantumLink, a post-quantum-secure Bluetooth protocol; Foundation offers an SDK, simulator, CLI tooling, and a developer program to build apps and agent workflows for the device. The company plans a KeyOS app store rollout to all users by the end of Q2 and highlights integrations such as Cake Wallet for cold storage. Foundation's hardware is manufactured in the USA in an ITAR-compliant facility. The firm is expanding its remit from Bitcoin self-custody into identity, multi-factor authentication, and AI agent authorization, and has raised $16.5 million in total funding to date.
- Solsten
Participated · Series B · Aug 2022
Founded in 2018, Solsten builds technology that measures human psychology at scale to help companies better understand and engage their customers. Its core offering is a human-insights engine that ingests psychological datasets and turns them into creative and business intelligence. The company’s new flagship platform, Elaris, enables clients to instantly generate content ideas and strategies based on these insights, aiming to drive customer growth and retention. Solsten is also developing emotionally intelligent AI agents, extending its capabilities beyond analytics into interactive customer experiences. The firm plans to use newly secured capital to expand Elaris, enhance its database services, and accelerate product development. Headquartered in Minneapolis, Solsten positions itself at the intersection of psychology and AI to unlock new levels of value for enterprises. No operating metrics or revenue figures were disclosed in the article.
- IndexZoo
Participated · Seed · Apr 2022
IndexZoo is a Boston-based provider of a decentralized crypto asset index protocol and a DeFi multi-chain ecosystem of tokenized indices. Led by CEO Marshall Chang, its core product is the Habitat Index Protocol. The company plans to deploy Habitat to multiple EVM-compatible Layer 1 and Layer 2 blockchains to establish a multi-chain index standard. IndexZoo has received grants from NEAR, Polygon, Avalanche and others to support development. It closed a $2M Seed funding round to expand operations and development efforts. Backers include CMS Holdings, Warburg Serres, DefinanceX, Pragma Ventures, 0xVentures, BigBrainHoldings and angel investors such as Nick Tong and Yenwen Feng.
- Burrow
Participated · Equity · Mar 2022
Burrow is a non-custodial liquidity pool platform operating as a decentralized money market built on the NEAR protocol. It allows users to supply and borrow assets for trading and supports deposits of NEAR, DAI, USDT, USDC, ETH and wBTC, plus wrapped staking assets such as stNEAR, stETH, stSOL and stFTM. By building on NEAR, Burrow says it offers near-zero transaction costs and fast transaction closing times compared with other blockchains. The company raised $5 million to bootstrap its initial trading liquidity. Burrow plans to launch a governance token staking program in its second month where staking the BRRR token yields xBRRR to vote on DAO proposals. Investors backing the platform include Dragonfly Capital, ParaFi Capital, Jump Crypto and QCP Capital among others, signaling institutional interest in its NEAR-native DeFi approach.