# Michael Seibel

> Michael Seibel is a pre-seed investor at Y Combinator backing Artificial Intelligence. See 207 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Y Combinator](https://shizune.co/investors/profile/y-combinator)
- Location: San Francisco, United States
- Total investments: 207
- Last investment: Feb 2026
- Lead investor: 47%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/mwseibel/
- X (Twitter): http://twitter.com/mwseibel
- Website: http://michaelseibel.com
- Facebook: https://www.facebook.com/michael.seibel

Michael Seibel is a pre-seed investor at Y Combinator in San Francisco focused on Artificial Intelligence and Software. Michael Seibel is the Managing Director and Group Partner of Y Combinator. He previously worked at Socialcam as a CEO. Michael Seibel attended Yale University.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $500k–$7.2M |
| Pre-Seed | $500k–$500k |
| Series A | $5.9M–$21M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Artificial Intelligence | 56 | 27% |
| Software | 49 | 24% |
| FinTech | 24 | 12% |
| Information Technology | 24 | 12% |
| Internet | 20 | 10% |

179 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Pre-Seed | 92 | 44% |
| Seed | 64 | 31% |
| Series A | 18 | 9% |
| Series B | 7 | 3% |
| Funding Round | 5 | 2% |

11 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 127 | 61% |
| Nigeria | 9 | 4% |
| United Kingdom | 5 | 2% |
| India | 3 | 1% |
| Singapore | 3 | 1% |

15 countries tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Simple AI | Simple AI is a software development firm that made an AI Assistant. | $14M | Seed | Feb 10, 2026 |  |
| Legion Health | Legion Health provides telepsychiatry services that enhance patient access to mental health care. The company focuses on integrating technology to streamline interactions between patients and providers while ensuring services are covered by insurance. It aims to support comprehensive mental wellness through personalized treatment plans andcollaboration with other care team members. |  | Seed | Jan 13, 2026 |  |
| FINNY | FINNY is an AI prospecting tool that provides technology solutions for financial advisors. | $17M | Series A | Dec 18, 2025 |  |
| Reditus Space | Reditus Space specializes in microgravity manufacturing, offering reusable small-scale re-entry vehicles for space research and production. | $7.1M | Seed | Dec 01, 2025 |  |
| Cuckoo | Cuckoo is an always-available, in-house realtime translator. Cuckoo instantly learns the technical details of your conversation from your keywords and documents and interprets into over 20 languages—customized for your specific industry and organization. Global teams like Snowflake, PagerDuty, Weights & Biases, dbt Labs, and SeAH rely onCuckoo for multilingual meetings, events, business trips, and more. | $1.8M | Seed | Nov 04, 2025 |  |
| Mecha Health | Mecha Health is a healthtech company that develops digital tools for remote injury assessment, monitoring, and treatment plans. | $4.1M | Seed | Nov 03, 2025 |  |
| FleetWorks Technology | FleetWorks is a logistics management platform that uses AI to automate manual freight brokerage operations. | $17M | Series A | Oct 10, 2025 |  |
| MarqVision | MarqVision helps global brands remove counterfeits from online marketplaces. | $48M | Series B | Sep 15, 2025 |  |
| DianaHR | DianaHR is an AI-Powered HR Person | $3.7M | Seed | Sep 15, 2025 |  |
| Motion | Motion is an AI time management platform that provides real-time interventions, reminders, and analytics. Motion mark sites as distracting to limit the time on them in the future.The company's tool keeps users from becoming distracted while browsing the web by providing real-time interventions, reminders, and analytics, as well as calendar,tab management, and focus tools. | $8.1M | Series C | Sep 08, 2025 |  |

10 of 207 investments shown.

## Co-investors
- [Pioneer Fund](https://shizune.co/investors/profile/pioneer-fund) — VC Fund, 19 deals together
- [Y Combinator](https://shizune.co/investors/profile/y-combinator) — VC Fund, 14 deals together
- [Unpopular Ventures](https://shizune.co/investors/profile/unpopular-ventures) — VC Fund, 13 deals together
- [Global Founders Capital](https://shizune.co/investors/profile/global-founders-capital) — VC Fund, 11 deals together
- [Liquid 2 Ventures](https://shizune.co/investors/profile/liquid2-ventures) — VC Fund, 10 deals together
- [Goodwater Capital](https://shizune.co/investors/profile/goodwater-capital) — VC Fund, 9 deals together

## About Y Combinator

VC Fund · Mountain View, United States

Y Combinator is a startup accelerator that provides funding and mentorship to early-stage companies. It offers a program where startups receive guidance from experienced entrepreneurs and investors. The organization helps founders in their business models and develop their products. Y Combinator serves industries such as technology, healthcare, andfinance.

5 contacts available at Y Combinator.

| Name | Title | Profile |
| --- | --- | --- |
| Boris Jabes | Visiting Partner | https://shizune.co/investors/profile/boris-jabes |
| Luther Lowe | Head of Public Policy | https://shizune.co/investors/profile/luther-lowe |
| Max Kolysh | Visiting Partner | https://shizune.co/investors/profile/max-kolysh |
| Brad Flora | Group Partner | https://shizune.co/investors/profile/brad-flora |
| Calvin French-Owen | Visiting Group Partner | https://shizune.co/investors/profile/calvin-french-owen |

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## FAQ

### What does Michael Seibel invest in?

Michael Seibel invests primarily in Artificial Intelligence, Software and FinTech startups, most often at Pre-Seed and Seed stage. Most of the 207 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 Michael Seibel's check size?

Michael Seibel typically joins rounds of $500k–$7.2M at Seed, $500k–$500k at Pre-Seed and $5.9M–$21M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Michael Seibel participates in.

### When did Michael Seibel last invest?

The most recent investment recorded for Michael Seibel closed in Feb 2026. Shizune tracks 207 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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