Tom Preston-Werner
Cofounder @ Preston-Werner Ventures
San Francisco, United States
Tom Preston-Werner is a seed investor at Preston-Werner Ventures in San Francisco focused on Software and Information Technology. Steve Jang is an individual investor.
- Total investments:
- 66
- Last investment:
- Lead investor:
- 11%
Last updated:
For AI agents: llms.txt
Industries Tom Preston-Werner invests in
Stages Tom Preston-Werner invests in
Countries Tom Preston-Werner invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $2M–$10M
- Pre-Seed
- $337k–$3.1M
- Series A
- $10M–$30M
Investment Focus
Industry
- Software 27 (41%)
- Information Technology 18 (27%)
- Artificial Intelligence 16 (24%)
- Developer Tools 12 (18%)
- Developer Platform 9 (14%)
Stage
- Seed 30 (45%)
- Series A 14 (21%)
- Pre-Seed 10 (15%)
- Series B 3 (5%)
- Angel 2 (3%)
Country
- United States 31 (47%)
- Germany 2 (3%)
- Singapore 2 (3%)
- United Kingdom 2 (3%)
- Spain 1 (2%)
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 | ||
| 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 | ||
| Milestone ensures your GenAI tools are fully integrated, optimized, and aligned with your business goals, driving measurable ROI and sustained innovation. | $10M / Seed / Nov 13, 2025 | ||
| Commutator Studios Commutator Studios created technologies to improve quantum application performance. | $1.7M / Seed / Jul 17, 2025 | ||
| Creatify AI provides a platform for creating user-generated content UGC style video ads. Users can generate multiple video ads by simply pasting a product link, utilizing a library of AI avatars for a more engaging presentation. The service automates video production, allowing users to produce ads quickly and efficiently. Additionally, Creatifyoffers tools for performance marketers to analyze their advertising strategies and gain insights into their competition. This combination of video creation and analytical features supports sales teams in enhancing their marketing efforts and improving engagement with potential customers. | $15.5M / Series A / May 28, 2025 | ||
| Sourcetable connect, sync, and query all the data in a spreadsheet, without needing to know how to code. Founded in 2019, Sourcetable is based in San Francisco, California, United States. | $4.3M / Seed / Mar 31, 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 | ||
| MoneyHash provides access to payment and fintech services across the Middle East & Africa with one simple integration. | $5.2M / Seed / Jan 20, 2025 | ||
| 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. | Pre-Seed / Aug 01, 2024 | ||
| Not Diamond focuses on optimizing the use of various AI models based on their strengths and capabilities. | $2.3M / Pre-Seed / Jul 30, 2024 | ||
| See all 66 investments → | |||
Co-Investors
About Preston-Werner Ventures
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.
Preston-Werner Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
|
Tom Preston-Werner
Cofounder
|
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FAQ
What does Tom Preston-Werner invest in?
Tom Preston-Werner invests primarily in Software, Information Technology and Artificial Intelligence startups, most often at Seed and Series A stage. Most of the 66 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 Tom Preston-Werner's check size?
Tom Preston-Werner typically joins rounds of $2M–$10M at Seed, $337k–$3.1M at Pre-Seed and $10M–$30M 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 Tom Preston-Werner participates in.
How do I contact Tom Preston-Werner?
Public channels for Tom Preston-Werner include LinkedIn, X (Twitter) and Facebook. 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 Tom Preston-Werner last invest?
The most recent investment recorded for Tom Preston-Werner closed in Jun 2026. Shizune tracks 66 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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