Nathan Doctor
Founder @ Infinite Capital
United States
Nathan Doctor is a seed investor at Infinite Capital in United States focused on Software and Blockchain. Nathan Doctor is the Founder of Infinite Capital, a firm investing in generational innovation, with a focus on deep tech. The firm manages a number of funds, and has been active across frontier technology markets for over a decade, with pre-consensus investments into sectors including electric vehicles, cryptocurrency, autonomous aerospace, satellites, and physical AI. Formerly he was the CEO/Co-Founder of Qualified.io a skills assessment platform, used by Apple, Facebook, GE, and Zoom. The team also built the developer community, Codewars.com, where over 4 million engineers train their coding skills.
- Total investments:
- 59
- Last investment:
- Lead investor:
- 3%
Last updated:
For AI agents: llms.txt
Industries Nathan Doctor invests in
Stages Nathan Doctor invests in
Countries Nathan Doctor invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $250k–$9M
- Pre-Seed
- $125k–$3M
Investment Focus
Industry
- Software 13 (22%)
- Blockchain 11 (19%)
- Cryptocurrency 7 (12%)
- Financial Services 5 (8%)
- FinTech 4 (7%)
Stage
- Seed 20 (34%)
- Funding Round 6 (10%)
- Pre-Seed 5 (8%)
- Series A 5 (8%)
- Initial Coin Offering 4 (7%)
Country
- United States 28 (47%)
- Singapore 3 (5%)
- Vietnam 1 (2%)
- Australia 1 (2%)
- South Korea 1 (2%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Mach Industries is a defense manufacturing company that develops unmanned systems and defense infrastructure. | $600M / Series C / Sep 10, 2026 | ||
| Mach Industries is a defense manufacturing company that develops unmanned systems and defense infrastructure. | $300M / Series C / Jun 01, 2026 | ||
| Radical AI is a technology startup focusing on changing materials science and advanced manufacturing through artificial intelligence. | $55M / Seed / Jul 18, 2025 | ||
| Printr is a chain-abstracted memecoin launchpad that instantly prints and trades memes. | $2.5M / Pre-Seed / Jan 25, 2025 | ||
| H3X Technologies manufactures the lightest electric aircraft propulsion systems in the world to enable sustainable aviation. H3X was founded by Jason Sylvestre, Eric Maciolek, and Max Liben in 2020. | $20M / Series A / Aug 06, 2024 | ||
| NFTs have become a huge part of web3. Whether you’re in it for the tech, the art, or just to be part of the amazing communities, NFTs are here to stay.However, with nftperp, you can now speculate on the floor prices of NFT projects including Bored Ape Yacht Club, CryptoPunks and more.nftperp was established in January, 2022 in Washington,District of Columbia. | Angel / May 15, 2024 | ||
| Holograph enables NFTs to survive and bridge between blockchains while maintaining total data integrity. The company was founded in 2020 and is based in Los Angeles, US. | $3M / Venture - Series Unknown / Apr 29, 2024 | ||
| Powering the future of hospitality & entertainment globally. | $3M / Pre-Seed / Mar 15, 2024 | ||
| Medallion is a company in the media and entertainment industry. Medallion is the future of fans. It was launched in 2020 and is based in New York City, United States. | $13.7M / Series A / Dec 21, 2023 | ||
| Membrane Labs is a fintech firm that provides institutional digital asset services for OTC transactions. | $20M / Series A / Oct 11, 2023 | ||
| See all 59 investments → | |||
Co-Investors
About Infinite Capital
Infinite Capital invests in generational innovation, with a focus on decentralized networks and deep tech.
Infinite Capital Contacts
| Name | Phone | Socials | |
|---|---|---|---|
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Nathan Doctor
Founder
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FAQ
What does Nathan Doctor invest in?
Nathan Doctor invests primarily in Software, Blockchain and Cryptocurrency startups, most often at Seed and Funding Round stage. Most of the 59 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does Nathan Doctor invest in?
Nathan Doctor typically joins rounds of $250k–$9M at Seed and $125k–$3M at Pre-Seed. These are whole funding-round sizes, not Nathan Doctor's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds Nathan Doctor took part in.
How do I contact Nathan Doctor?
Public channels for Nathan Doctor 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 Nathan Doctor last invest?
The most recent investment recorded for Nathan Doctor closed in Sep 2026. Shizune tracks 59 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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