# David S. Miller

> David S. Miller is a seed investor at Clean Energy Ventures backing Manufacturing and Battery. See 9 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Clean Energy Ventures](https://shizune.co/investors/profile/clean-energy-ventures-cev)
- Location: Boston, United States
- Total investments: 9
- Last investment: Nov 2024
- Lead investor: 89%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/davidsmiller7/
- X (Twitter): https://twitter.com/CleanEnergyVC
- Website: https://x.com/CleanEnergyVC

David S. Miller is a seed investor at Clean Energy Ventures in Boston focused on Manufacturing and Battery. David S. Miller is based out of Waban, Massachusetts and is the Co-Founder and Managing Partner of Clean Energy Ventures. David previously worked at Clean Energy Venture Group as an executive managing director. David S. Miller attended the Massachusetts Institute of Technology. David S. Miller was awarded a patent for co-developing a “one number”telecom service, and taught at Rutgers University in the Electrical Engineering Department.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Manufacturing | 2 | 22% |
| Battery | 1 | 11% |
| Leisure | 1 | 11% |
| Chemical | 1 | 11% |
| Consumer | 1 | 11% |

14 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 3 | 33% |
| Series A | 2 | 22% |
| Convertible Note | 2 | 22% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Transaera | Transaera is developing a new class of affordable, energy-efficient,environmentally friendly cooling systems. | $8.2M | Seed | Nov 04, 2024 |  |
| Pearl Certification | Pearl is a national firm that provides third-party certification of healthy, safe, comfortable, energy, and water-efficient homes. Working with real estate agents, contractors, and builders, the company helps sellers recoup the value of their home investments by increasing buyer confidence in one of the most important transactions of purchasing ahome. By promoting and verifying high-performance homes, Pearl Certification helps drive the adoption of energy-efficient and sustainable building practices, ultimately benefiting homeowners, the real estate market, and the environment. | $9.5M | Series A | May 20, 2021 |  |
| Boston Materials | Boston Materials manufactures Z-axis Carbon Fiber products that can revolutionize the $130B+ lightweight materials market and unlock significant GHG emissions reductions across industries. Boston Materials products add new conductivity, stiffness, and durability benefits to existing composite materials, like carbon fiber, and sheet metals. Thecompany's products are made using 100 percent reclaimed carbon fiber enabling up to 80 percent GHG emissions savings compared to standard composite materials and metals. | $8M | Series A | May 20, 2021 |  |
| Volexion | Volexion is a battery manufacturing and graphene coating technology for commercial Li-ion cathode materials with 10x performance. The company's technology provides a comprehensive and generalizable combination. It gives clients longer battery life, better power output, and a wider voltage range. | $1.1M | Seed | Apr 08, 2021 |  |
| Boston Materials | Boston Materials manufactures Z-axis Carbon Fiber products that can revolutionize the $130B+ lightweight materials market and unlock significant GHG emissions reductions across industries. Boston Materials products add new conductivity, stiffness, and durability benefits to existing composite materials, like carbon fiber, and sheet metals. Thecompany's products are made using 100 percent reclaimed carbon fiber enabling up to 80 percent GHG emissions savings compared to standard composite materials and metals. | $565K | Seed | May 11, 2020 |  |
| Pearl Certification | Pearl is a national firm that provides third-party certification of healthy, safe, comfortable, energy, and water-efficient homes. Working with real estate agents, contractors, and builders, the company helps sellers recoup the value of their home investments by increasing buyer confidence in one of the most important transactions of purchasing ahome. By promoting and verifying high-performance homes, Pearl Certification helps drive the adoption of energy-efficient and sustainable building practices, ultimately benefiting homeowners, the real estate market, and the environment. | $2.5M | Series A | Dec 22, 2019 |  |
| Boston Materials | Boston Materials manufactures Z-axis Carbon Fiber products that can revolutionize the $130B+ lightweight materials market and unlock significant GHG emissions reductions across industries. Boston Materials products add new conductivity, stiffness, and durability benefits to existing composite materials, like carbon fiber, and sheet metals. Thecompany's products are made using 100 percent reclaimed carbon fiber enabling up to 80 percent GHG emissions savings compared to standard composite materials and metals. | $2.1M | Convertible Note | Oct 18, 2019 |  |
| Pearl Certification | Pearl is a national firm that provides third-party certification of healthy, safe, comfortable, energy, and water-efficient homes. Working with real estate agents, contractors, and builders, the company helps sellers recoup the value of their home investments by increasing buyer confidence in one of the most important transactions of purchasing ahome. By promoting and verifying high-performance homes, Pearl Certification helps drive the adoption of energy-efficient and sustainable building practices, ultimately benefiting homeowners, the real estate market, and the environment. | $2M | Convertible Note | Jul 17, 2019 |  |
| Boston Materials | Boston Materials manufactures Z-axis Carbon Fiber products that can revolutionize the $130B+ lightweight materials market and unlock significant GHG emissions reductions across industries. Boston Materials products add new conductivity, stiffness, and durability benefits to existing composite materials, like carbon fiber, and sheet metals. Thecompany's products are made using 100 percent reclaimed carbon fiber enabling up to 80 percent GHG emissions savings compared to standard composite materials and metals. | $1.8M | Seed | Mar 19, 2019 |  |

9 of 9 investments shown.

## Co-investors
- [Clean Energy Venture Group](https://shizune.co/investors/profile/clean-energy-venture-group) — VC Fund, 3 deals together
- [Second Century Ventures](https://shizune.co/investors/profile/second-century-ventures) — VC Fund, 2 deals together
- [Accelr8](https://shizune.co/investors/profile/accelr8) — VC Fund, 1 deal together
- [ACVC Partners](https://shizune.co/investors/profile/acvc-partners) — VC Fund, 1 deal together
- [Earth Foundry](https://shizune.co/investors/profile/earthfoundry) — VC Fund, 1 deal together
- [Earth Foundry](https://shizune.co/investors/profile/energy-foundry) — VC Fund, 1 deal together

## About Clean Energy Ventures

VC Fund · Boston, United States

Clean Energy Ventures invests in seed-stage climate tech startups in North America, Europe, and Israel. The company's investments are commercializing disruptive clean energy technologies and business model innovations and achieving significant scale by taking advantage of market-driven forces to address climate change.

5 contacts available at Clean Energy Ventures.

| Name | Title | Profile |
| --- | --- | --- |
| Daniel Goldman | Co-Founder & Managing Director | https://shizune.co/investors/profile/dan-goldman-f113 |
| David S. Miller | Co-Founder & Managing Director | https://shizune.co/investors/profile/david-s-miller-dc98 |
| Temple Fennell | Co-Founder & Managing Director | https://shizune.co/investors/profile/temple-fennell |
| Jeffrey Weiss | Senior Venture Partner | https://shizune.co/investors/profile/jeffrey-weiss-38bf |
| John Santoleri | Venture Partner | https://shizune.co/investors/profile/john-santoleri |

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### Similar stage
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- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does David S. Miller invest in?

David S. Miller invests primarily in Manufacturing, Battery and Leisure startups, most often at Seed and Series A stage. Most of the 9 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 S. Miller last invest?

The most recent investment recorded for David S. Miller closed in Nov 2024. Shizune tracks 9 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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