# Arthur Breitman

> Arthur Breitman is a seed investor backing Software and Information Technology. See 3 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Total investments: 3
- Last investment: Jan 2026
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/arthur-breitman-7b04aa308
- Website: https://x.com/arthurb

Arthur Breitman is a seed investor focused on Software and Information Technology. Arthur worked as a quantitative analyst at Goldman Sachs and Morgan Stanley.

## Contacts

5 contacts available for Arthur Breitman: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/arthur-breitman?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $6M–$6M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 3 | 100% |
| Information Technology | 3 | 100% |
| Artificial Intelligence | 2 | 67% |
| Blockchain | 1 | 33% |
| Cryptocurrency | 1 | 33% |

7 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 2 | 67% |
| Series A | 1 | 33% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Israel | 1 | 33% |
| United States | 1 | 33% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Theorem | Theorem is an AI based Software Development firm offering productivity and verification tools for development. | $6M | Seed | Jan 27, 2026 | https://theoremlabs.com/ |
| Magic | Magic is an AI coding startup that enables developers to work with AI to find code for building apps. The company allows software engineers to use natural language to describe the application or function they want to create. Magic AI then generates all the necessary code to develop that app. | $23M | Series A | Feb 06, 2023 | https://magic.dev |
| StarkWare Industries | StarkWare Industries uses Stark technology to develop a full proof stack in generating and verifying proofs of computational integrity. | $6M | Seed | Jan 31, 2018 | http://www.starkware.co |

3 of 3 investments shown.

## Co-investors
- [10x Founders](https://shizune.co/investors/profile/10x-founders) — VC Fund, 1 deal together
- [Amplify Partners](https://shizune.co/investors/profile/amplify-partners) — VC Fund, 1 deal together
- [CapitalG](https://shizune.co/investors/profile/google-capital) — VC Fund, 1 deal together
- [Halcyon](https://shizune.co/investors/profile/halcyon-d8cf) — VC Fund, 1 deal together
- [Khosla Ventures](https://shizune.co/investors/profile/khosla-ventures) — VC Fund, 1 deal together
- [MetaStable Capital](https://shizune.co/investors/profile/metastable-capital) — VC Fund, 1 deal together

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## FAQ

### What does Arthur Breitman invest in?

Arthur Breitman invests primarily in Software, Information Technology and Artificial Intelligence startups, most often at Seed and Series A stage. Most of the 3 investments tracked by Shizune back companies in Israel. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Arthur Breitman's check size?

Arthur Breitman typically joins rounds of $6M–$6M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Arthur Breitman participates in.

### How do I contact Arthur Breitman?

Public channels for Arthur Breitman include LinkedIn and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### When did Arthur Breitman last invest?

The most recent investment recorded for Arthur Breitman closed in Jan 2026. Shizune tracks 3 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### 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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