# Jim Breyer

> Jim Breyer is a Series B investor at Breyer Capital backing Artificial Intelligence. See 104 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Breyer Capital](https://shizune.co/investors/profile/breyer-capital)
- Location: Menlo Park, United States
- Total investments: 104
- Last investment: Jun 2026
- Lead investor: 33%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/jim-breyer-361900b2/
- X (Twitter): https://twitter.com/jimihendrixlive
- Website: https://breyercapital.com/
- Facebook: https://www.facebook.com/jim.breyer1

Jim Breyer is a Series B investor at Breyer Capital in Menlo Park focused on Artificial Intelligence and Health Care. Jim Breyer is based out of Austin, Texas, and is the Founder & CEO of Breyer Capital. Jim previously worked at IDG Capital as Co-Chairman. Jim Breyer attended Harvard Business School.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $6M–$150M |
| Series A | $7.5M–$30M |
| Series B | $13M–$80M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 16 | 15% |
| Health Care | 13 | 13% |
| Software | 12 | 12% |
| Information Technology | 12 | 12% |
| Financial Services | 8 | 8% |

122 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series B | 22 | 21% |
| Series A | 19 | 18% |
| Seed | 14 | 13% |
| Funding Round | 11 | 11% |
| Series C | 10 | 10% |

12 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 49 | 47% |
| United Kingdom | 3 | 3% |
| Singapore | 2 | 2% |
| Egypt | 1 | 1% |
| Ghana | 1 | 1% |

10 countries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Circuit | Circuit offers a platform for feature extraction to streamline data preparation for AI and machine learning. | $30M | Series A | Jun 17, 2026 |  |
| Catena Labs | Catena Labs incubate independent products spanning identity, communications, AI, and commerce. The company's mission is to empower people with agency, safety, value, and joy online. | $30M | Series A | May 20, 2026 |  |
| Advanced Machine Intelligence | Advanced Machine Intelligence develops artificial intelligence systems that model real-world environments using sensor data. The organization focuses on building machine learning architectures that form abstract representations of physical and digital environments, allowing systems to reason, predict outcomes, and plan sequences of actions. Itsresearch includes world models that process continuous and complex data while filtering unpredictable elements to support structured decision making. The technology is designed to enable AI agents to evaluate the consequences of actions and operate under defined safety and control mechanisms. Advanced Machine Intelligence collaborates with industry and research communities to explore applications of these systems in areas such as industrial automation, robotics, wearable technology, and healthcare. The company also publishes research and develops software frameworks that support experimentation, deployment, and evaluation of intelligent systems. | $1B | Seed | Mar 10, 2026 |  |
| Circuit | Circuit offers a platform for feature extraction to streamline data preparation for AI and machine learning. | $30M |  | Feb 17, 2026 |  |
| RoseRx | Healthcare from home. Access online doctors and treatments anytime, anywhere. |  | Seed | Jun 07, 2025 |  |
| Catena Labs | Catena Labs incubate independent products spanning identity, communications, AI, and commerce. The company's mission is to empower people with agency, safety, value, and joy online. | $18M | Seed | May 20, 2025 |  |
| SandboxAQ | SandboxAQ develops quantitative artificial intelligence technologies that combine AI methods with physics-based modeling and advanced computational techniques to address scientific and industrial challenges. Its Large Quantitative Models (LQMs) are designed to analyze complex quantitative data and support applications in areas such as drugdiscovery, chemicals and materials research, cybersecurity, navigation, and sensing. The company provides software and simulation tools that help organizations study molecular interactions, manage cryptographic systems, and operate in environments where conventional positioning technologies may be unreliable. SandboxAQ also works with experimental and proprietary scientific datasets to generate predictions and insights for research and engineering workflows. Its technologies are used across industries including life sciences, energy, defense, and manufacturing. | $150M | Series E | Apr 04, 2025 |  |
| Network Bio | Network Bio is a clinical and molecular data library enabling precision medicine approaches for common human diseases. Its platform delivers a centralized repository for clinical and molecular data that allows researchers to identify patterns and correlations that can be used to develop new treatments and diagnostic tools. | $17M | Seed | Feb 27, 2025 |  |
| Taager | Taager is a social e-commerce platform enabling online merchants with end-to-end logistics. | $6.8M | Series B | Feb 11, 2025 |  |
| SandboxAQ | SandboxAQ develops quantitative artificial intelligence technologies that combine AI methods with physics-based modeling and advanced computational techniques to address scientific and industrial challenges. Its Large Quantitative Models (LQMs) are designed to analyze complex quantitative data and support applications in areas such as drugdiscovery, chemicals and materials research, cybersecurity, navigation, and sensing. The company provides software and simulation tools that help organizations study molecular interactions, manage cryptographic systems, and operate in environments where conventional positioning technologies may be unreliable. SandboxAQ also works with experimental and proprietary scientific datasets to generate predictions and insights for research and engineering workflows. Its technologies are used across industries including life sciences, energy, defense, and manufacturing. | $300M |  | Dec 18, 2024 |  |

10 of 104 investments shown.

## Co-investors
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund, 17 deals together
- [Omidyar Network](https://shizune.co/investors/profile/omidyar-network) — VC Fund, 6 deals together
- [Digital Currency Group](https://shizune.co/investors/profile/digital-currency-group) — VC Fund, 5 deals together
- [Good Growth Capital](https://shizune.co/investors/profile/good-growth-capital) — VC Fund, 5 deals together
- [Greycroft](https://shizune.co/investors/profile/greycroft) — VC Fund, 5 deals together
- [Khosla Ventures](https://shizune.co/investors/profile/khosla-ventures) — VC Fund, 5 deals together

## About Breyer Capital

VC Fund · Menlo Park, United States

Breyer Capital is a premier global venture capital and private equity investor focused on catalyzing high-impact entrepreneurs in the United States and China. Founded by Jim Breyer in 2006, Breyer Capital makes long-term, idea-driven strategic investments in its chosen core areas: social media, entertainment/media, digital health, andfinancial technologies.Breyer Capital actively partners with a diverse set of companies including early-stage startups building breakthrough technologies, fast growing companies, and established worldwide leading corporations. Its team enjoys helping to frame strategic investments anchored by the passion of founders and owner/operator teams, the insights of its network of world-class investors, and a conviction that artificial intelligence, machine learning, and virtual reality will transform technology and investment opportunities globally.

4 contacts available at Breyer Capital.

| Name | Title | Profile |
| --- | --- | --- |
| Daniel Breyer | Investor | https://shizune.co/investors/profile/daniel-breyer |
| Jim Breyer | Founder & CEO | https://shizune.co/investors/profile/jim-breyer |
| Leo Grady | CEO in Residence | https://shizune.co/investors/profile/leo-grady |
| Morgan Cheatham | Head of health care and life sciences | https://shizune.co/investors/profile/morgan-cheatham |

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## FAQ

### What does Jim Breyer invest in?

Jim Breyer invests primarily in Artificial Intelligence, Health Care and Software startups, most often at Series B and Series A stage. Most of the 104 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Jim Breyer's check size?

Jim Breyer typically joins rounds of $6M–$150M at Seed, $7.5M–$30M at Series A and $13M–$80M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Jim Breyer participates in.

### When did Jim Breyer last invest?

The most recent investment recorded for Jim Breyer closed in Jun 2026. Shizune tracks 104 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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