# Claire Arthurs Kart

> Claire Arthurs Kart is a angel investor at o1Labs (San Francisco) backing Web3 and Blockchain. See 1 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [o1Labs](https://shizune.co/investors/profile/o-1-labs)
- Location: San Francisco, United States
- Total investments: 1
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/claire-arthurs-kart-6601b67/

Claire Arthurs Kart is a angel investor at o1Labs in San Francisco focused on Web3 and Blockchain. Claire Arthurs Kart serves as Head of Marketing & Community at O(1) Labs.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Web3 | 1 | 100% |
| Blockchain | 1 | 100% |
| Decentralized Finance (DeFi) | 1 | 100% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Optimum | Optimum constitutes a decentralized, high-performance memory infrastructure tailored for use across various blockchains. |  | Angel | Feb 28, 2025 |  |

1 of 1 investments shown.

## About o1Labs

VC Fund · San Francisco, United States

Founded in 2017, o1Labs is a blockchain technology company with a core focus on zero knowledge (zk) and other forms of novel cryptography. Their notable achievements include the incubation of the Mina Protocol, the world’s first zk blockchain that is lightweight, scalable, and decentralized, and the creation of o1js, a powerful and intuitiveframework for zk application developers. o1Labs’ vision is to catalyze a new generation of applications powered by zero knowledge cryptography.

5 contacts available at o1Labs.

| Name | Title | Profile |
| --- | --- | --- |
| Nicole Farrar | General Counsel | https://shizune.co/investors/profile/nicole-farrar |
| Benjamin Ward | Head of BizOps & Finance; Head of BizOps & Finance | https://shizune.co/investors/profile/benjamin-ward-e917 |
| Brad Cohn | Head of Strategy & Operations | https://shizune.co/investors/profile/brad-cohn |
| Claire Arthurs Kart | Head of Marketing & Community | https://shizune.co/investors/profile/claire-arthurs-kart |
| Emre Tekişalp | VP of Business Development and Operations; CEO | https://shizune.co/investors/profile/emre-teki%C5%9Falp |

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## FAQ

### What does Claire Arthurs Kart invest in?

Claire Arthurs Kart invests primarily in Web3, Blockchain and Decentralized Finance (DeFi) startups, most often at Angel stage. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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