# David Delfassy

> David Delfassy is a Series A investor at TDK Ventures (London) backing Energy and Renewable Energy. See 4 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [TDK Ventures](https://shizune.co/investors/profile/tdk-ventures)
- Location: London, United Kingdom
- Total investments: 4
- Last investment: Jun 2026
- Lead investor: 50%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/david-delfassy/
- Website: https://x.com/DavidDelfassy

David Delfassy is a Series A investor at TDK Ventures in London focused on Energy and Renewable Energy. David Delfassy is based out of London, England, and is the Investment Director at TDK Ventures and Board of Director at Rodatherm Energy. David Delfassy attended Duke University. David Delfassy has been certified as a Private Pilot.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Energy | 2 | 50% |
| Renewable Energy | 2 | 50% |
| Software | 1 | 25% |
| Metaverse | 1 | 25% |
| Industrial | 1 | 25% |

9 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 3 | 75% |
| Seed | 1 | 25% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 3 | 75% |
| Luxembourg | 1 | 25% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Aston Labs | Aston Labs operates a decentralized utility organization working to build a carbon-free utility network. The company's platform is made to support 100% uptime, equality of access, zero carbon, digital currency, Defi, and metaverse, giving people access to modern life. | $20M | Series A | Jun 16, 2026 |  |
| Rodatherm Energy | A geothermal company that plumbs its boreholes with a closed loop | $38M | Series A | Sep 15, 2025 |  |
| Tulum Energy | Tulum Energy is a cutting-edge energy business developing a unique methane pyrolysis approach for low-cost, scalable clean hydrogen production that does not require CCS infrastructure. | $27M | Seed | Jul 07, 2025 |  |
| Spiritus | Spiritus is a climate tech company developing direct-air-capture technology. Its approach combines the Spiritus Sorbent and the Spiritus Carbon Orchard, offering a scalable and modular system for low-cost DAC and sequestration (DAC+S). The company is committed to making carbon removal an accessible and practical tool in the global fight againstclimate change. | $30M | Series A | Mar 06, 2025 |  |

4 of 4 investments shown.

## Co-investors
- [TechEnergy Ventures](https://shizune.co/investors/profile/techenergy-ventures) — VC Fund, 2 deals together
- [Active Impact Investments](https://shizune.co/investors/profile/active-impact-investments) — VC Fund, 1 deal together
- [Aramco Ventures](https://shizune.co/investors/profile/aramco-ventures) — VC Fund, 1 deal together
- [Building Ventures](https://shizune.co/investors/profile/building-ventures) — VC Fund, 1 deal together
- [CDP Venture Capital](https://shizune.co/investors/profile/cdp-venture-capital) — VC Fund, 1 deal together
- [Doral Energy-Tech Ventures](https://shizune.co/investors/profile/doral-energy-tech-ventures) — VC Fund, 1 deal together

## About TDK Ventures

VC Fund · San Jose, United States

TDK Ventures is a technology-focused venture fund based in San Jose, California. We invest globally in Seed to B-round startups that leverage fundamental material science to unlock an attractive and sustainable future for the world. We believe in a sustainable world where digital and energy transformation will improve billions of lives for thebetter. Our mission is to help accelerate learnings and contributions to society, investing in start-ups with similar idealism. We aim to find meaningful opportunities in early-stage technology, especially in Health & Wellness, next Generation Transportation, Robotics & Industrial, Mixed Reality, and the wider IoT market segments. Dielectrics, magnetics, MEMS, neuro-electricals, organic materials, piezoelectrics, semiconductors, and many other types of materials, TDK Ventures is looking for the hardest problems where we have a proven track record of solving since 1935 and are passionate to continue solving these challenges together with our global innovation partners.

3 contacts available at TDK Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Anil Achyuta | Investment Director | https://shizune.co/investors/profile/anil-achyuta |
| Nicolas Sauvage | President | https://shizune.co/investors/profile/nicolas-sauvage |
| David Delfassy | Investment Director | https://shizune.co/investors/profile/david-delfassy |

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund

## FAQ

### What does David Delfassy invest in?

David Delfassy invests primarily in Energy, Renewable Energy and Software startups, most often at Series A and Seed stage. Most of the 4 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did David Delfassy last invest?

The most recent investment recorded for David Delfassy closed in Jun 2026. Shizune tracks 4 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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