Preston-Werner Ventures
VC Fund
San Francisco, United States
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.
- Total investments:
- 23
- Last investment:
- Lead investor:
- 26%
- Fund size:
- $1.2M
- Last fund:
Last updated:
For AI agents: llms.txt
Industries Preston-Werner Ventures invests in
Stages Preston-Werner Ventures invests in
Countries Preston-Werner Ventures invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Round size
- Seed
- $1.7M–$7.5M
- Pre-Seed
- $850k–$9M
- Series A
- $7M–$27M
Investment Focus
Industry
- Software 8 (35%)
- Artificial Intelligence 8 (35%)
- Information Technology 6 (26%)
- Developer Tools 4 (17%)
- Cloud Computing 3 (13%)
Stage
- Seed 13 (57%)
- Pre-Seed 5 (22%)
- Series A 3 (13%)
- Angel 1 (4%)
- Series C 1 (4%)
Country
- United States 15 (65%)
- Australia 1 (4%)
- United Kingdom 1 (4%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Tom Preston-Werner
Cofounder
|
Cofounder | Total investments: 66 | Find email |
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| 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 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 | ||
| 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 develops a cloud GPU platform that provides on-demand GPU infrastructure for artificial intelligence, machine learning, and other compute-intensive workloads. The company uses proprietary GPU virtualization and orchestration technology to improve GPU utilization and make computing capacity available at lower costs. Its platformprovides configurable GPU instances with persistent storage, fast provisioning, multi-GPU configurations, and developer tools including a web console, command-line interface, and VS Code integration. Thunder Compute also provides GPU virtualization software that can integrate with existing enterprise environments, including Kubernetes, Slurm, virtual machines, bare-metal GPU hosts, and cloud infrastructure, to increase usable capacity from existing GPU fleets. The company serves developers, researchers, startups, enterprises, and GPU infrastructure providers. | $4.5M / Seed / Jan 20, 2026 | ||
| Earthmover is an early-stage startup developing a cloud-based platform for array data analytics. | $7.2M / Seed / Sep 22, 2025 | ||
| 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 created technologies to improve quantum application performance. | $1.7M / Seed / Jul 17, 2025 | ||
| 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 is a software development company that offers open source toolchain for JavaScript. | $4.6M / Seed / Nov 10, 2024 | ||
| 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 | ||
| See all 23 investments → | |||
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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 Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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