Michael Seibel
Managing Director and Partner @ Y Combinator
San Francisco, United States
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.
- Total investments:
- 212
- Last investment:
- Lead investor:
- 46%
Last updated:
For AI agents: llms.txt
Industries Michael Seibel invests in
Stages Michael Seibel invests in
Countries Michael Seibel invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $500k–$7.2M
- Pre-Seed
- $500k–$500k
- Series A
- $5.9M–$21M
Investment Focus
Industry
- Artificial Intelligence 57 (27%)
- Software 49 (23%)
- Information Technology 25 (12%)
- FinTech 24 (11%)
- Internet 20 (9%)
Stage
- Pre-Seed 94 (44%)
- Seed 63 (30%)
- Series A 18 (8%)
- Series B 7 (3%)
- Funding Round 5 (2%)
Country
- United States 128 (60%)
- Nigeria 9 (4%)
- United Kingdom 5 (2%)
- India 3 (1%)
- Singapore 3 (1%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Simple AI is a software development firm that made an AI Assistant. | $14M / Seed / Feb 10, 2026 | ||
| 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 is an AI prospecting tool that provides technology solutions for financial advisors. | $17M / Series A / Dec 18, 2025 | ||
| 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 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 is a healthtech company that develops digital tools for remote injury assessment, monitoring, and treatment plans. | $4.1M / Seed / Nov 03, 2025 | ||
| FleetWorks is a logistics management platform that uses AI to automate manual freight brokerage operations. | $17M / Series A / Oct 10, 2025 | ||
| MarqVision helps global brands remove counterfeits from online marketplaces. | $48M / Series B / Sep 15, 2025 | ||
| DianaHR is an AI-Powered HR Person | $3.7M / Seed / Sep 15, 2025 | ||
| 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 | ||
| See all 212 investments → | |||
Co-Investors
About Y Combinator
Y Combinator invests a standard amount of capital in exchange for equity and through uncapped safe agreements. Participants engage in a three-month intensive cycle that focuses on product development and preparations for fundraising. The firm offers access to a private networking platform for knowledge sharing and hosts events featuring speakers from various sectors. This program culminates in a presentation event where founders showcase their businesses to a curated group of investors.
Y Combinator Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Boris Jabes
Visiting Partner
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Luther Lowe
Head of Public Policy
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Max Kolysh
Visiting Partner
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Brad Flora
Group Partner
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Calvin French-Owen
Visiting Group Partner
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FAQ
What does Michael Seibel invest in?
Michael Seibel invests primarily in Artificial Intelligence, Software and Information Technology startups, most often at Pre-Seed and Seed stage. Most of the 212 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.
How do I contact Michael Seibel?
Public channels for Michael Seibel include LinkedIn, X (Twitter) 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 Michael Seibel last invest?
The most recent investment recorded for Michael Seibel closed in Feb 2026. Shizune tracks 212 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 Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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