# Preston-Werner Ventures

> Preston-Werner Ventures is a VC fund backing Software. See 23 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: VC Fund
- Location: San Francisco, United States
- Total investments: 23
- Last investment: Jun 2026
- Lead investor: 26%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/preston-werner-ventures/
- Website: https://prestonwernerventures.com/

Preston-Werner Ventures is an investment firm that currently funds projects at the intersection of social justice, climate change, and technology. The company is committed in making investments in order to advance justice and dignity in the present. They invest in solutions to remove and reduce the amount of carbon dioxide in the atmosphere.Preston-Werner Ventures was founded by Tom Preston-Werner and Theresa Preston-Werner.

## Contacts

5 contacts available for Preston-Werner Ventures. Shizune tracks 1 team members at Preston-Werner Ventures. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-team-emails/preston-werner-ventures?utm_source=investor_profile

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $1.7M–$7.5M |
| Pre-Seed | $850k–$9M |
| Series A | $7M–$27M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 8 | 35% |
| Artificial Intelligence | 8 | 35% |
| Information Technology | 6 | 26% |
| Developer Tools | 4 | 17% |
| Cloud Computing | 3 | 13% |

34 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 13 | 57% |
| Pre-Seed | 5 | 22% |
| Series A | 3 | 13% |
| Angel | 1 | 4% |
| Series C | 1 | 4% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 15 | 65% |
| Australia | 1 | 4% |
| United Kingdom | 1 | 4% |

## Team

| Name | Title | Investments | Profile |
| --- | --- | --- | --- |
| Tom Preston-Werner | Cofounder | 66 | https://shizune.co/investors/profile/tom-preston-werner |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Strix | Strix is an open-source AI security platform that uses autonomous agents to continuously pentest applications, APIs, and codebases. | $6.7M | Seed | Jun 01, 2026 |  |
| Unkey | Unkey operates as an open-source API authentication and authorization platform, primarily catering to user-facing APIs. The platform enables developers to create, verify, and manage API keys with low latency. Unkey's services are designed to help developers secure, manage, and scale their APIs. The company also offers an Elixir SDK, providinga simple example of its use. Unkey is also involved in solving API authentication for the next generation of developers. | $4.5M | Seed | Apr 23, 2026 |  |
| Command Code | Langbase helps developers ship composable AI agents with hyper-personalized memory (RAG).Langbase is the composable AI infrastructure and developer experience to build, collaborate, and deploy any AI agents (AI features). Our mission is to make AI accessible to everyone, any developer not just AI/ML experts. We are the only composable AIinfrastructure. That's all we do. | $5M | Seed | Feb 25, 2026 |  |
| Thunder Compute | Thunder is a Cloud computing to democratize access to GPUs and solve the ongoing GPU shortage. Decentralized peer-to-peer GPU cloud computing | $4.5M | Seed | Jan 20, 2026 |  |
| Earthmover | Earthmover is an early-stage startup developing a cloud-based platform for array data analytics. | $7.2M | Seed | Sep 22, 2025 |  |
| Myriad AI | Myriad AI provides a reliable and controllable AI-powered platform to put Compliance on Autopilot, enabling businesses to thrive. | $7.8M | Seed | Sep 16, 2025 |  |
| Commutator Studios | Commutator Studios Commutator Studios created technologies to improve quantum application performance. | $1.7M | Seed | Jul 17, 2025 |  |
| Mote | Mote's carbon-negative hydrogen solution is a one-of-a-kind method of eliminating CO2 from the environment. This second facility, like its first in Bakersfield, will use carbon capture and geological sequestration to produce carbon-negative hydrogen. | $7M | Series A | Mar 04, 2025 |  |
| Voidzero | Voidzero is a software development company that offers open source toolchain for JavaScript. | $4.6M | Seed | Nov 10, 2024 |  |
| BuildPass | BuildPass is a platform that uses AI to make construction sites more efficient. It combines all critical workflows of a construction site into a single platform, connecting all stakeholders and ensuring projects are delivered on time, built to a high quality and workers are kept safe. | $7.5M | Seed | Oct 24, 2024 |  |

10 of 23 investments shown.

## Co-investors
- [1984 Ventures](https://shizune.co/investors/profile/1984-ventures) — VC Fund, 2 deals together
- [Amplify Partners](https://shizune.co/investors/profile/amplify-partners) — VC Fund, 2 deals together
- [Andreessen Horowitz](https://shizune.co/investors/profile/andreessen-horowitz) — VC Fund, 2 deals together
- [bd Partners](https://shizune.co/investors/profile/bd-partners) — VC Fund, 2 deals together
- [Breakwater Ventures](https://shizune.co/investors/profile/breakwater-ventures-7831) — VC Fund, 2 deals together
- [Counteract](https://shizune.co/investors/profile/counteract) — VC Fund, 2 deals together

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## FAQ

### What does Preston-Werner Ventures invest in?

Preston-Werner Ventures invests primarily in Software, Artificial Intelligence and Information Technology startups, most often at Seed and Pre-Seed stage. Most of the 23 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 Preston-Werner Ventures's check size?

Preston-Werner Ventures typically joins rounds of $1.7M–$7.5M at Seed, $850k–$9M at Pre-Seed and $7M–$27M 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 Preston-Werner Ventures participates in.

### How do I contact Preston-Werner Ventures?

Public channels for Preston-Werner Ventures include LinkedIn 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.

### Who are the partners at Preston-Werner Ventures?

The team at Preston-Werner Ventures includes Tom Preston-Werner (Cofounder). The Team section lists each member with their title, investment count and links.

### 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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