Preston-Werner Ventures — Full Portfolio

Retrace is an open-source record-replay tool and AI debugger for Python that captures failed pytest and CI runs as replayable .retrace artifacts, letting an AI debug backwards from real runtime values to the root cause.

AI & Machine LearningDeveloper ToolsSaaS

Aalo develops advanced nuclear reactor technology aimed at producing electricity at under 3 cents per kilowatt-hour.

Climate TechDeep TechEnergyHardware

Matt(Co-founder)inYasir(Co-founder)in

Aera Farms makes Victory, a fridge-sized aeroponic farming appliance that uses automation and AI-powered crop management to grow leafy greens and root vegetables indoors from reusable seed pods.

AgTechFoodTechHardware

Flock Safety provides an automated drone-based first responder system that deploys drones to 911 calls and critical incidents, delivering rapid scene awareness and video intelligence to law enforcement and emergency services.

Defense TechGovTechRobotics

Alinia builds compliance and safety guardrails for enterprise AI, detecting hallucinations and regulatory violations in LLM and agent-based applications such as RAG assistants.

AI & Machine LearningCybersecurityEnterprise Software

Astranis manufactures small, high-powered geosynchronous satellites equipped with advanced digital processing technology for global telecommunications and connectivity services.

Advanced ManufacturingDeep TechHardwareSpace TechSan Francisco, US

John Gedmark(Founder/CEO)inRyan McLinko(Founder/CTO)in

Atuin is a developer tool that syncs, searches, and backs up shell history across machines with end-to-end encryption, and includes an integrated AI assistant accessible directly from the terminal prompt.

Developer Tools

BuildPass is a construction management platform covering estimating and takeoff, site management, and job finances (budgets, commitments, progress claims and cash forecasting), plus an AI agent that works from a company's live project records.

Construction TechPropTechSaaS

Cleanlab develops machine learning tools for data quality and model improvement, serving enterprises and ML practitioners across industries.

AI & Machine LearningData & InfrastructureDeveloper ToolsEnterprise SoftwareSaaS

Curtis NorthcuttinJonas Mueller(Co-founder)inAnish AthalyeinAnishathalye(Co-founder)Ulyana Tkachenko(Co-founder)in

Clerk provides user management and authentication infrastructure for developers, enabling quick integration of complete user management systems into applications.

Developer ToolsEnterprise SoftwareSaaSSan Francisco, US

Braden Sidoti(Executive Officer, Director)Colin Sidoti(Executive Officer, Director)

BoardShvetank Jain(Director)Karan Mehandru(Director)in

Command Code is a terminal-based AI coding agent that builds, fixes, tests, and refactors software while continuously learning a developer's coding preferences through their accepts, rejects, and edits.

AI & Machine LearningDeveloper ToolsSaaS

Commonwealth Fusion Systems develops commercial fusion power plants using high-temperature superconducting magnet technology to provide grid-scale energy.

CleantechClimate TechDeep TechEnergyCambridge, US

Brandon Sorbom(Founder)Robert Mumgaard(Executive Officer, Director)Daniel Brunner(Executive Officer)

BoardMassimiliano Pieri(Director)Katie Rae(Director)inAlan Eustace(Director)

Commutator Studios offers a tool that automatically optimizes quantum applications by finding the best execution parameters across different quantum computers, reducing errors and improving accuracy, reliability, and performance.

Deep TechDeveloper ToolsQuantum Computing

Cursor is a code editor that enables teams to manage and distribute Model Context Protocol (MCP) servers and integrations through team marketplaces, with features for organization-level access control and cloud agent integration.

AI & Machine LearningDeveloper Tools

Cursor is a company building AI-assisted software development tools, with work spanning secure codebase indexing, semantic search, context-aware code completions, and multi-agent collaboration.

AI & Machine LearningDeveloper ToolsSaaS

Earthmover builds a cloud data platform for exploring, visualizing, analyzing, and sharing large-scale scientific datasets, with a focus on climate and Earth science data.

AI & Machine LearningClimate TechCloud ComputingData & InfrastructureNew York, US

Joseph Hamman(Executive Officer, Director)Ryan Abernathey(Co-founder)Tony Liu(Director)Joe Hamman(Co-founder)

Elicit is an AI-powered research assistant that helps users discover, analyze, and synthesize scientific literature and research findings.

AI & Machine LearningEdTechEnterprise SoftwareSaaSOakland, US

Andreas Stuhlmüller(Co-founder)Jungwon ByunAdam Heneghan(Executive Officer)Kevin Willer(Director)John McGee(Director)G. Eric Heneghan(Director)

Fal provides fast inference for generative AI models, particularly for image and video generation tasks like SDXL and Whisper.

AI & Machine LearningCloud ComputingCreator EconomyDeveloper ToolsSan Francisco, US

Gorkem Yurtseven(Founder & CEO)inBurkay Gur(Founder)in

BoardSteve Jang(Director)inJennifer Li(Director)inGlenn Solomon(Director)in

Flock Safety provides a platform that connects neighborhoods, businesses, and law enforcement to share verified incident information and enable coordinated emergency response based on shared evidence.

AI & Machine LearningDeveloper ToolsEnterprise SoftwareGovTechHardwareSaaSAtlanta, US

Garrett Langley(Founder/CEO)inMatt Feury(Founder/CTO)in

Flux develops a browser-based tool for hardware design collaboration that enables teams to work together efficiently.

AI & Machine LearningDeveloper ToolsHardware

Matthias Wagner(Founder)inLance Cassidy(Founder)in

Freeplay provides a platform for software product development teams to build and maintain generative AI products using best practices in experimentation, iteration, and data management.

AI & Machine LearningDeveloper ToolsEnterprise Software

Opensend identifies engaged website visitors and matches them to opt-in consumer profiles so ecommerce brands can re-engage and convert them via email, SMS, and ads.

AI & Machine LearningE-commerceMarketing Tech

Graphite is an AI-powered code review platform that helps development teams ship code faster through automated reviews, collaborative features, and a unified PR workflow integrated with GitHub.

AI & Machine LearningDeveloper Tools

Merrill Lutsky(Founder)inGreg Foster(Founder)in

Impossible Foods produces plant-based meat alternatives, including beef, pork, chicken, and sausage products designed to replicate the taste, nutrition, and cooking properties of conventional animal meat.

ConsumerFoodTechHealthtechRedwood City, US

Pat Brown(Founder & CEO)David Lee(Executive Officer)

BoardBart Swanson(Director)inSamir Kaul(Director)inTai Ronnen(Director)Fedele Bauccio(Director)

Inference Capital is an investment firm representing permanent capital and allocators across private markets, providing advisory and direct allocation services.

Fintech

Inngest is an execution layer for agents and workflows that helps engineers build and optimize event-driven workflows without manual retry logic or queue management.

AI & Machine LearningCloud ComputingDeveloper ToolsRoyal Oak, US

Tony Holdstock-Brown(CEO & Founder)Dan Farrelly(CTO & Founder)inDaniel Farrelly(Executive Officer, Director)

BoardJamin Ball(Director)Dan Cahana(Director)in

Inth provides developer-first consent infrastructure that allows software teams to manage cookie consent, regional rules, and script loading directly in code rather than through external platforms.

AI & Machine LearningData & InfrastructureDeveloper ToolsEnterprise SoftwareSaaSSan Francisco, US

Christopher Burns(Founder)in

Limitless creates AI tools designed to augment human intelligence and overcome cognitive limitations by improving memory and focus.

AI & Machine LearningEnterprise SoftwareFuture of WorkHardware

Dan Siroker(Founder)in

Liquid AI is a foundation model company, spun out of MIT CSAIL, that builds efficient, compute- and cost-optimized general-purpose AI systems designed to run on any device.

AI & Machine LearningDeep TechEnterprise SoftwareBrookline, US

Daniela Rus(Co-founder)Mathias Lechner(Co-founder & CTO)Ramin Hasani(Co-founder & CEO)Alexander Amini(Co-founder & CSO)Louis Hunt(Executive Officer)Stephen Pagliuca(Director)

LM Studio offers Bionic, a locally-run AI agent designed to work with open models for creativity, work, and coding tasks.

AI & Machine LearningDeep TechDeveloper Tools

Massdriver provides infrastructure automation and management for cloud-native organizations, enabling developers and operations teams to provision and manage infrastructure with ease while maintaining compliance and operational standards.

Cloud ComputingDeveloper ToolsEnterprise SoftwareLos Angeles, US

Cory O'Daniel(Founder)inChris Hill(Founder)in

Milestone is an analytics platform that tracks AI spend, coding agents, software delivery, and custom KPIs by grounding answers in a company's engineering data.

AI & Machine LearningDeveloper ToolsEnterprise Software

MoneyHash provides a payment orchestration platform that lets businesses integrate multiple payment methods—cards, cash, wallets, BNPL, bank accounts, and crypto—customize checkout experiences, and localize payments by market.

FintechSaaS

Monumo develops an AI engine called Anser to design and optimize electric motors and drives, aiming to reduce cost and improve performance in EV powertrains.

AI & Machine LearningDeep TechMobility & Transportation

The page lists financial and data regulations (e.g.

Fintech

Netlify is a platform for building, deploying, and scaling modern web applications, serving millions of developers and thousands of enterprises.

AI & Machine LearningCloud ComputingDeveloper ToolsSaaSSan Francisco, US

Mathias Biilmann(Co-founder & CEO)Christian Bach(Co-founder, Chief Strategy and Creative Officer)

Not Diamond provides an intelligent model router for coding agents that predicts which language model to use for each input, aiming to reduce inference costs while maintaining accuracy.

AI & Machine LearningDeveloper ToolsEnterprise Software

Ona provides secure cloud workspaces for running AI coding agents, giving each agent a full cloud development environment with network access, permissions, and runtime controls.

AI & Machine LearningCloud ComputingDeveloper Tools

PATH makes refillable aluminum water bottles designed to reduce single-use plastic waste.

Circular EconomyConsumer

PlanetScale is a database platform built on the Vitess open-source project, designed for scaling large distributed systems.

Cloud ComputingData & InfrastructureDeveloper Tools

Poolside builds open-weight foundation models and agentic coding models, including the Laguna family, along with the systems and infrastructure needed to train, refine, and improve these models.

AI & Machine LearningDeveloper Tools

Jason Warner(Founder & CEO)Eiso Kant(Founder)

Postman is an API platform that helps developers build, test, and manage APIs throughout their lifecycle.

AI & Machine LearningCloud ComputingDeep TechDeveloper ToolsEnterprise SoftwareSaaSSan Francisco, US

Abhinav Asthana(CEO and co-founder)Ankit Sobti(Co-founder)Abhijit Kane(Co-founder)

Power Planet develops enhanced geothermal systems (EGS) that extract clean, always-on power from deep, high-temperature rock, using proprietary drilling automation technology.

CleantechClimate TechEnergy

Prisma builds an ORM and database tools for developers to simplify database workflows across application development, deployment, and scaling.

Cloud ComputingData & InfrastructureDeveloper Tools

Purplefish is a takeoff tool that extracts material bills of materials, weld counts, and labor takeoff from isometric piping drawings (ISOs) using custom AI models, linking each line item back to its spot on the drawing.

AI & Machine LearningConstruction TechSaaS

QuantPi provides a validation and testing platform for enterprise AI, checking models, agents, and AI systems before and after deployment to produce statistical evidence of reliability.

AI & Machine LearningEnterprise SoftwareSaaS

Railway is a cloud deployment platform that connects to a code repository and handles build, configuration, networking (SSL, load balancing, public/private endpoints), scaling, and observability.

Cloud ComputingData & InfrastructureDeveloper Tools

RedwoodSDK is a software development framework, presented through its blog and version 1.0 release.

Developer Tools

Peter Pistorius

Replicated provides a container-based platform for software vendors to deploy cloud-native applications in customer environments.

Cloud ComputingDeveloper ToolsEnterprise Software

ReSim provides a simulation and testing platform for physical AI and robotics teams, letting them evaluate embodied AI performance across thousands of virtual scenarios before deployment.

AI & Machine LearningDeveloper ToolsRobotics

Retool is a platform for building and governing internal tools, admin panels, and dashboards across teams.

Data & InfrastructureDeveloper ToolsEnterprise SoftwareFuture of WorkSaaSSan Francisco, US

David Hsu(Founder/CEO)in

Snyk is a developer-focused security platform that identifies and fixes vulnerabilities in code, dependencies, containers, and cloud infrastructure using AI-powered analysis.

AI & Machine LearningCybersecurityDeveloper ToolsBoston, US

Guy Podjarny(Director)Peter McKay(Executive Officer, Director)Stephanie Dominy(Executive Officer)

BoardPhilippe Botteri(Director)inMatthew Weigand(Director)inKen Fox(Director)

StackBlitz provides a browser-based development environment for creating and launching web applications, with code execution happening entirely within the user's browser using WebAssembly technology.

Cloud ComputingDeveloper ToolsEnterprise SoftwareSan Francisco, US

Eric Simons(CEO & Co-Founder)Albert Pai(CTO & Co-Founder)Alexander Berger(Chief Operating Officer)Bryan Adams(Vice President of Sales)Mitchell Wright(Head of Growth Marketing and Data)Hyllarie Colyer(Head of People)

StackOne provides infrastructure for AI agents to integrate with and act across business applications through optimized connectivity, execution, and security features.

AI & Machine LearningDeveloper ToolsEnterprise SoftwareNewbury, GB

Romain Sestier(Founder)in

Stripe provides financial infrastructure for businesses to accept payments, offer financial services, and implement custom revenue models across international markets in 135+ currencies.

FintechSaaSSan Francisco, US

John Collison(Founder/President)inPatrick Collison(Founder/CEO)inWilliam Gaybrick(Executive Officer)

BoardMichael Moritz(Director)in

Supabase is a fully managed PostgreSQL backend platform that integrates with AI builders like Claude, Lovable, and Bolt to enable rapid development of production applications.

Cloud ComputingData & InfrastructureDeveloper ToolsEnterprise SoftwareSan Francisco, US

Paul Copplestone(Founder)inAnt Wilson(Founder)in

Tailscale provides secure connectivity infrastructure.

Cloud ComputingCybersecurityDeveloper Tools

Avery Pennarun(Founder & CEO)in

Thunder Compute develops GPU virtualization software that improves utilization of graphics processing units in data centers.

AI & Machine LearningCloud ComputingData & InfrastructureDeep TechDeveloper ToolsEnterprise SoftwareSan Francisco, US

Carl Peterson(Founder)inBrian Model(Founder)in

Team Tito builds Tito, a ticketing platform used by event organisers worldwide that has processed over $1 billion in tickets.

MarketplacesMedia & EntertainmentSaaSLong Island City, US

Weiqiang Chu(Executive Officer, Director)Platon Levitski(Executive Officer, Director)PaulDoc

tldraw provides an SDK for building canvas-based applications like whiteboards, diagrams, and collaborative tools in React.

Developer ToolsSaaSLondon

Stephen Ruiz(Executive Officer, Director)

Tuist offers a platform for mobile development teams working with Xcode projects, providing tools to generate projects, speed up builds, run impacted tests, and share app previews.

Developer ToolsSaaS

Turso is a database engine built as a Rust rewrite of SQLite, adding concurrent writes, native vector search, cloud-native replication, and browser/on-device support via WebAssembly.

AI & Machine LearningData & InfrastructureDeveloper Tools

Unkey is a developer platform that unifies API infrastructure into a single control plane, offering Git-based and Docker deployments, edge gateways, API key management, rate limiting, and real-time analytics.

Cloud ComputingData & InfrastructureDeveloper Tools

Upside Foods produces cultivated meat using cell-based technology.

BiotechFoodTechSan Francisco, US

Uma Valeti(Founder & CEO)in

Val Town is a platform that lets GTM and operations teams build and deploy internal tools, integrations, and automations to live URLs, with support for AI coding agents like Claude, Codex, and Cursor.

Cloud ComputingDeveloper ToolsSaaS

VoidZero builds open-source infrastructure and tooling for the JavaScript ecosystem, developed by the creators and maintainers of widely used JavaScript projects.

AI & Machine LearningDeveloper ToolsSaaS

Weights & Biases is an AI developer platform that enables teams to build, train, and monitor AI agents, applications, and models with tools for experiment tracking, model management, and agent evaluation.

AI & Machine LearningData & InfrastructureDeveloper ToolsSan Francisco, US

Shawn Lewis(Executive Officer, Director)Lukas Biewald(Executive Officer, Director)Chris Van Pelt(Executive Officer, Director)Mariah Nagy(Executive Officer)Yan-David Erlich(Executive Officer)Cameron Kinloch(Executive Officer)

Zed is a code editor written from scratch in Rust that uses multiple CPU cores and the GPU for high performance, with support for running AI agents in parallel to edit code and run tools.

AI & Machine LearningDeveloper ToolsFuture of Work

Nathan SoboAntonio ScandurraMax Brunsfeld

Zoo builds Zoo Design Studio, AI-native CAD software featuring Zookeeper, a conversational CAD agent that interprets design intent, reasons and iterates, and generates editable B-rep models on a modern geometry engine.

Advanced ManufacturingAI & Machine LearningSaaS