Preston-Werner Ventures

Preston-Werner Ventures is a San Francisco-based venture capital firm founded in 2023 by Tom Preston-Werner and Theresa Preston-Werner. It concentrates on technology investments with an emphasis on social justice and climate solutions, supporting ventures that develop technologies to remove or reduce atmospheric carbon dioxide and advance equity and dignity.

Tom Preston-Werner

Co-Founder

14 past transactions

Mote

Series A in 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.

VoidZero

Seed Round in 2024
VoidZero is a software development company specializing in open-source tools for JavaScript developers. It creates a unified, high-performance toolchain that streamlines web development, offering components such as a parser, transformer, resolver, linter, formatter, minifier, bundler, test runner, and meta framework support. This suite of tools aims to enhance productivity and efficiency for JavaScript developers.

BuildPass

Seed Round in 2024
BuildPass is a company that specializes in enhancing construction site efficiency through its AI-driven platform. The platform consolidates essential workflows into one system, linking all stakeholders involved in a project. This integration aims to ensure projects are completed on schedule, meet high-quality standards, and maintain worker safety. BuildPass offers features such as ticket management, document handling, inductions, site diaries, toolbox services, medical information tracking, and SMS communication. These tools enable builders of various sizes to transition to digital operations using mobile devices.

Brightband

Series A in 2024
Brightband is a software company specializing in advanced, end-to-end Earth System AI for enhanced weather and climate decision-making. Its platform, powered by AI technology, offers personalized predictions and access to observational data and forecasts, empowering individuals to adapt to and manage weather changes effectively.

Aalo Atomics

Series A in 2024
Aalo Atomics is a clean energy company focused on developing and manufacturing small modular nuclear reactors (SMRs). These reactors are designed to be compact enough to fit in a garage yet powerful enough to supply electricity to various applications, from data centers to entire cities. The company aims to produce clean, affordable energy by commercializing high-technological readiness nuclear fission reactors, thereby reducing power consumption and promoting safety.

Langbase

Pre Seed Round in 2024
Langbase is a leading serverless platform designed for the development of AI products, offering a unique infrastructure that enables developers to build, collaborate, and deploy various AI applications. The company specializes in creating an open-source web AI framework, BaseAI.dev, which facilitates the integration of hyper-personalized memory into AI agents. By providing a serverless, pay-as-you-go model, Langbase processes billions of tokens and messages daily, making AI accessible to a broader range of developers beyond just AI and machine learning experts. Its platform supports the development of generative AI applications and features an inference engine for large language models, emphasizing an enhanced developer experience and enterprise governance. Langbase is dedicated to empowering developers to transform their ideas into innovative AI solutions.

Myriad AI

Pre Seed Round in 2024
Myriad AI provides a reliable and controllable AI-powered platform to put Compliance on Autopilot, enabling businesses to thrive.

Aspect Build

Pre Seed Round in 2023
Aspect Build is a technology company that specializes in streamlining the use of Bazel, a powerful build tool, for Developer Infrastructure teams. Their platform integrates with existing continuous integration and delivery systems, accelerating build times and reducing compute costs. It enables teams managing large codebases to enhance productivity and efficiency by leveraging Bazel's built-in incremental capabilities.

Tldraw

Seed Round in 2023
Tldraw is a startup founded in 2021 by Steve Ruiz, offering a collaborative drawing application accessible without any login requirement. The platform provides an infinite canvas where users can draw lines or objects, add text, and insert media such as images, videos, or GIFs. Tldraw's software is designed to facilitate software development by offering a virtual whiteboard with hand-drawn style diagrams. It also provides developer tools for integrating its canvas into other platforms. The service is available free of charge.

Rho Impact

Pre Seed Round in 2023
Rho Impact is a company that specializes in providing data-driven climate impact forecasts to assist investors and organizations in developing and implementing effective net-zero strategies. Its platform, Koi, delivers real-time, auditable data that allows users to evaluate the potential effects of climate technologies across various sectors and regions. By integrating expert research and advanced artificial intelligence, Rho Impact equips stakeholders with the necessary tools to accurately model avoided emissions and validate their contributions to global decarbonization initiatives. The company's focus on addressing the challenges of impact and ESG planning, tracking, and reporting enables clients to streamline their strategies, manage environmental, social, and governance risks, and meet stakeholder expectations and regulatory requirements.

Massdriver

Angel Round in 2023
Massdriver is a Pasadena, California-based company founded on June 23, 2021, by Cory O'Daniel. It offers a visual development environment that enables engineers to create production-ready cloud architectures efficiently. By simplifying the cloud infrastructure design process, Massdriver allows users to draw and connect components without needing extensive DevOps expertise. The platform integrates observability and security into every aspect of its infrastructure, providing standardized, self-service options for users. This enables customers to compose entire systems seamlessly across different regions or cloud providers, enhancing scalability and security in their cloud operations.

Renewell

Seed Round in 2022
Renewell, headquartered in Bakersfield, California, specializes in repurposing idle oil and gas wells into gravity-based energy storage systems. Their technology involves lowering a weight connected to a regenerative winch down an abandoned wellbore during periods of low demand, storing potential energy, and raising it back up when demand is high, releasing electricity onto the grid. This innovative approach helps reduce greenhouse gas emissions by transforming inactive oil and gas infrastructure into flexible renewable energy storage solutions.

fal

Pre Seed Round in 2022
Generative Media Platform for Developers

Netlify

Series C in 2020
Netlify, Inc. is a cloud-based platform that streamlines web development by automating the process of building and deploying web applications. Founded in 2014 and based in San Francisco, the company offers a comprehensive suite of services including the Netlify platform, which integrates repositories and automates builds and deployments, as well as Netlify Build, a Git workflow for managing modern web projects. Additionally, Netlify provides tools like Netlify Edge, an application delivery network optimized for speed, and Netlify Dev, which allows users to run the platform locally on their laptops. By combining modern web frameworks, serverless functions, and edge computing, Netlify empowers developers and businesses to create high-performance, scalable websites efficiently. The platform is trusted by a range of notable brands, enhancing the way digital experiences are delivered across the web.
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