# Sam Altman

> Sam Altman is a seed investor at Apollo Projects backing Software and Artificial Intelligence. See 187 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Apollo Projects](https://shizune.co/investors/profile/apollo-project)
- Location: San Francisco, United States
- Total investments: 187
- Last investment: Nov 2025
- Lead investor: 21%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/sam-altman-827a33179/
- X (Twitter): http://twitter.com/sama
- Website: http://blog.samaltman.com/
- Facebook: https://www.facebook.com/sam.altman.96

Sam Altman is a seed investor at Apollo Projects in San Francisco focused on Software and Artificial Intelligence. Sam Altman is the CEO and co-founder of OpenAI. He is a Partner of Apollo Projects. Altman was the president of Y Combinator. Sam attended Stanford University.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.2M–$10M |
| Series A | $10M–$50M |
| Series B | $17M–$100M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 36 | 19% |
| Artificial Intelligence | 24 | 13% |
| Biotechnology | 16 | 9% |
| Information Technology | 16 | 9% |
| E-Commerce | 15 | 8% |

212 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 73 | 39% |
| Series A | 38 | 20% |
| Series B | 23 | 12% |
| Pre-Seed | 10 | 5% |
| Series C | 9 | 5% |

13 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 119 | 64% |
| Canada | 2 | 1% |
| Ghana | 1 | 1% |
| Libya | 1 | 1% |
| Israel | 1 | 1% |

8 countries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Exowatt | Modular Full-Stack Renewable Energy Solutions for Commercial and Industrial Applications | $50M | Series A | Nov 13, 2025 |  |
| Red Queen Bio | Red Queen Bio works with frontier labs to map AI-enabled biothreats and pre-build medical countermeasures against them. | $15M | Seed | Nov 13, 2025 |  |
| Preventive | Preventive mission is to determine whether the newest generation of gene editing technologies can be used safely and responsibly to correct devastating genetic conditions for future children. | $30M | Venture - Series Unknown | Oct 30, 2025 |  |
| Arcadia Medicine | Arcadia Medicine is a biotechnology company that creates psychedelic medicine to treat mental health issues. | $9.3M | Seed | Oct 06, 2025 |  |
| Coco | Coco is a last-mile delivery service that deploys human-operated sidewalk robots to transport goods from merchants to their customers. Its robot fleet serves thousands of customers per week in Santa Monica, Los Angeles, Austin, and Houston, paving the way for a more optimistic future of delivery that benefits local communities.Launched inFebruary 2020, the company has partnered with national restaurant brands like SBE (Umami Burger) and is actively scaling across many locations. It serves a wide range of family-operated restaurants like Bangkok West Thai in Santa Monica and San Pedro Brewing Company in Los Angeles. | $80M | Series B | Jun 11, 2025 |  |
| Exowatt | Modular Full-Stack Renewable Energy Solutions for Commercial and Industrial Applications | $35M | Series A | Apr 22, 2025 |  |
| Rescale | Rescale is a cloud simulation platform that enables research scientists and engineers to build, compute, analyze, and scale simulations.The high-performance computing cloud platform delivers intelligent computing for digital R&D and enables more than 300 customers from startups to Fortune 50 enterprises to accelerate design cycles and time tomarket. Rescale gives research scientists and engineers the ability to run their simulation and artificial intelligence workloads on the cloud provider of their choice, using specialized hardware architectures and software templates optimized for their use cases, without any set-up or maintenance. Investors such as Initialized Capital, Keen Venture Partners, SineWave Ventures, Data Collective, ITV Ventures, Jump Capital, and M12 (formerly Microsoft Ventures), as well as Mitsubishi UFJ Capital, Quiet Capital, Streamlined Ventures, Translink Capital, Two Roads Group, Y Combinator, Hitachi Ventures, Nautilus Venture Partners, NVIDIA, Republic Labs, and Samsung Catalyst Fund backs Rescale.In 2011, Joris Poort and Adam McKenzie headquartered the company in San Francisco, California. | $115M | Series D | Apr 07, 2025 |  |
| Rescale | Rescale is a cloud simulation platform that enables research scientists and engineers to build, compute, analyze, and scale simulations.The high-performance computing cloud platform delivers intelligent computing for digital R&D and enables more than 300 customers from startups to Fortune 50 enterprises to accelerate design cycles and time tomarket. Rescale gives research scientists and engineers the ability to run their simulation and artificial intelligence workloads on the cloud provider of their choice, using specialized hardware architectures and software templates optimized for their use cases, without any set-up or maintenance. Investors such as Initialized Capital, Keen Venture Partners, SineWave Ventures, Data Collective, ITV Ventures, Jump Capital, and M12 (formerly Microsoft Ventures), as well as Mitsubishi UFJ Capital, Quiet Capital, Streamlined Ventures, Translink Capital, Two Roads Group, Y Combinator, Hitachi Ventures, Nautilus Venture Partners, NVIDIA, Republic Labs, and Samsung Catalyst Fund backs Rescale.In 2011, Joris Poort and Adam McKenzie headquartered the company in San Francisco, California. | $115M | Series D | Apr 07, 2025 |  |
| Campus | Campuswire is a real-time messaging app for college classes that streamlines class discussions, Q&A, and announcements. The company on a mission to optimize the world’s teaching and learning. They are assembling a world-class team of engineers, designers, pedagogists, and more to solve problems in teaching and learning. | $46M | Series B | Mar 20, 2025 |  |
| Helion Energy | Operator of a patented plasma accelerator technology designed to address the growing need for clean energy. The company's technology specializes in designing fusion generators based on magneto-inertial fusion with a fifty-megawatt module and energy regeneration, thereby enabling customers to use low-cost, clean, and safe energy. | $425M | Series F | Jan 28, 2025 |  |

10 of 187 investments shown.

## Co-investors
- [SV Angel](https://shizune.co/investors/profile/sv-angel) — VC Fund, 23 deals together
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 21 deals together
- [Initialized Capital](https://shizune.co/investors/profile/initialized-capital) — VC Fund, 14 deals together
- [Andreessen Horowitz](https://shizune.co/investors/profile/andreessen-horowitz) — VC Fund, 13 deals together
- [Founders Fund](https://shizune.co/investors/profile/founders-fund) — VC Fund, 13 deals together
- [Sequoia Capital](https://shizune.co/investors/profile/sequoia-capital) — VC Fund, 12 deals together

## About Apollo Projects

VC Fund · Greenville, United States

Apollo Projects is an early-stage investment fund managed by the Altman brothers. It invests in founders who have audacious visions of the future, and who can execute to make their visions reality.

3 contacts available at Apollo Projects.

| Name | Title | Profile |
| --- | --- | --- |
| Jack Altman | Partner | https://shizune.co/investors/profile/jack-altman |
| Max Altman | Managing Partner | https://shizune.co/investors/profile/max-altman |
| Sam Altman | Partner | https://shizune.co/investors/profile/sam-altman |

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## FAQ

### What does Sam Altman invest in?

Sam Altman invests primarily in Software, Artificial Intelligence and Biotechnology startups, most often at Seed and Series A stage. Most of the 187 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 Sam Altman's check size?

Sam Altman typically joins rounds of $1.2M–$10M at Seed, $10M–$50M at Series A and $17M–$100M 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 Sam Altman participates in.

### When did Sam Altman last invest?

The most recent investment recorded for Sam Altman closed in Nov 2025. Shizune tracks 187 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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