Pioneer Fund

Pioneer Fund is a San Francisco-based venture capital firm founded in 2017 that makes early-stage investments across a wide range of sectors, including consumer products and services, financial services, information technology, advanced manufacturing, blockchain, life sciences, gaming, artificial intelligence and machine learning, construction technology, education technology, fintech, agriculture technology, advertising technology, augmented reality, autonomous vehicles, legal technology, oncology, pet technology, real estate technology, ride-hailing, SaaS and supply chain technology. The firm benefits from a network of more than 420 Y Combinator alumni, enabling it to identify and support YC-backed startups.

Lior Abraham

Venture Partner

Wayne Anderson

Venture Partner

Jon Armstrong

Venture Partner

Tamara Bain

Venture Partner

Kate Bambino

Venture Partner

Lena Belogolova

Venture Partner

Bryan Beshore

Venture Partner

Rajiv Bhat

Venture Partner

Amitav Chakravartty

Venture Partner

Bryant Chou

Venture Partner

Andrew DSouza

Venture Partner

Michael Dilworth

CFO and Partner

Kshitij Dixit

Venture Partner

Cobi Druxerman

Venture Partner

Luqui Díaz

Venture Partner

Steli Efti

Venture Partner

James Fong

Venture Partner

Taro Fukuyama

Venture Partner

Jarret Glasscock

Venture Partner

Jason Gray

Managing Partner

Alanna Gregory

Venture Partner

Ranvir Gujral

Venture Partner

Joshua Halickman

Venture Partner

Taylor Halliday

Venture Partner

Michael Heinrich

Venture Partner

Nancy Hua

Venture Partner

Albert Huang MD

Venture Partner

Faiz Jalia

Analyst

Steven Johnston

Venture Partner

Beth Kolko

Venture Partner

Jackie Kong

Venture Partner

Kwin Hultman Kramer

Venture Partner

Greg Kress

Venture Partner

Ashwin Kumar

Venture Partner

Tiffany Kuo

Venture Partner

Vanessa Lee

Venture Partner

Ilya Lichtenstein

Venture Partner

Evan Lodge

Venture Partner

Parthi Loganathan

Venture Partner

Richard Ma

Venture Partner

Ritik Malhotra

Venture Partner

Rohit Malhotra

Venture Partner

Matthew McDonald

Venture Partner

Dave Messina

General Partner

Will Mitchell

Venture Partner

Francesco Mosconi

Venture Partner

Anthony Nemitz

Venture Partner

Victor Ng

Venture Partner

Peter Nixey

Venture Partner

Eric Norman

Visiting General Partner

Will Olsen

Venture Partner

Jon Parker

Venture Partner

Amit Patel

Venture Partner

Puja Patel

Venture Partner

David Rabie

Venture Partner

Saad Rizvi

Venture Partner

Juan Salcedo

Venture Partner

Matt Schiller

Venture Partner

William Schlacks

Venture Partner

Robert Schultz

Venture Partner

Jonathan Schwartz

Venture Partner

Martin Shen

Venture Partner

Bradley Siegler

Venture Partner

Vikram Somasundaram

Venture Partner

Laks Srini

Venture Partner

Thomas Steinacher

Venture Partner

Steven Stewart

Venture Partner

Evan Stites-Clayton

Venture Partner

Brad Stronger

Venture Partner

Alexander Strunkin

Venture Partner

Ted Suzman

General Partner

Tim Suzman

General Partner

Jonathan Tang

Venture Partner

Bryan Wilcox

Venture Partner

Kitch Wilson

Venture Partner

Ray Wu

Venture Partner

Andrew Yaroshevsky

Venture Partner

Richard Yu

Venture Partner

Winston Zhang

Venture Partner

Ti Zhao

Venture Partner

Past deals in Open Source

Unsloth

Seed Round in 2024
Unsloth is an AI startup dedicated to enhancing the accessibility of artificial intelligence for users across various sectors. The company has developed an open-source fine-tuning and training platform that significantly accelerates the process of customizing large language models (LLMs), making them 2.2 times faster and reducing VRAM usage by 62%. This all-in-one solution is designed to assist scientists and researchers in diverse fields, including skin cancer prediction, DNA sequencing, vaccine development, environmental conservation, and space research. By providing tools that enable the rapid creation of accurate custom models, Unsloth empowers users to analyze large datasets more effectively, thus facilitating advancements in critical areas of research and innovation.

Exploding Gradients

Pre Seed Round in 2024
Exploding Gradients is into building an open-source evaluation and testing infrastructure for LLM applications.

K-Scale Labs

Pre Seed Round in 2024
K-Scale Labs specializes in developing advanced humanoid robots, with a focus on making them versatile, accessible, and capable of real-world applications. The company's flagship product, K-Bot, is a state-of-the-art platform designed for flexibility, running any user-provided AI models and coming preloaded with K-Scale OS, a high-performance, memory-safe operating system built in Rust. K-Bot is fully repairable and customizable, offering superior quality and empowering developers to innovate without constraints. Additionally, K-Scale Labs provides open-source tools to facilitate robotics development, and a cash-back program based on usage, encouraging data-sharing initiatives.

Fileforge

Seed Round in 2024
Fileforge is an API for PDF document workflows. With Fileforge, you can generate, manipulate, host, share, sign and track your documents - all in on place. Our open-source library helps developers build complex documents that integrate with our API and external services to build document-centric workflows.

Ubicloud

Seed Round in 2024
Ubicloud is an operator of an open source Infrastructure-as-a-Service (IaaS) platform that enables users to run cloud services in a flexible manner, either through a managed service or via self-hosting. The platform is designed to significantly reduce cloud spending by offering cost-effective solutions that can lower expenses by 3 to 10 times. Ubicloud provides a range of features, including elastic computing, virtual networking, block storage, and Attribute-Based Access Control (ABAC). This empowers businesses to utilize cloud services while maintaining control over their infrastructure through open source code, ensuring portability and freedom in their cloud operations.

Flower Labs

Series A in 2024
Flower Labs is an open-source framework dedicated to advancing artificial intelligence through federated learning. By enabling companies to train AI models on distributed, sensitive data, Flower Labs addresses a critical challenge in the AI landscape where most models rely on centralized public data. The platform is designed to be interoperable across various operating systems and hardware, allowing for seamless integration in heterogeneous edge device environments. It supports a wide range of machine learning frameworks and programming languages, making federated approaches accessible to a diverse set of users. Notable companies such as Banking Circle, Nokia, Porsche, and Brave utilize Flower to enhance their AI capabilities while maintaining data privacy and security. This innovative approach aims to leverage significantly more data, unlocking potential advancements in AI development.

Tracecat

Pre Seed Round in 2024
Tracecat develops an open-source, AI-powered cloud-based security management tool. It offers real-time threat detection and response, automating workflows for security teams across various business sizes.

Twenty (YC S23)

Seed Round in 2023
Building a better Salesforce, powered by the Open Source community.

Flower Labs

Pre Seed Round in 2023
Flower Labs is an open-source framework dedicated to advancing artificial intelligence through federated learning. By enabling companies to train AI models on distributed, sensitive data, Flower Labs addresses a critical challenge in the AI landscape where most models rely on centralized public data. The platform is designed to be interoperable across various operating systems and hardware, allowing for seamless integration in heterogeneous edge device environments. It supports a wide range of machine learning frameworks and programming languages, making federated approaches accessible to a diverse set of users. Notable companies such as Banking Circle, Nokia, Porsche, and Brave utilize Flower to enhance their AI capabilities while maintaining data privacy and security. This innovative approach aims to leverage significantly more data, unlocking potential advancements in AI development.

Netmaker

Seed Round in 2022
Netmaker is an open-source platform with a modern virtual networking solution on wireguards.

Medplum

Seed Round in 2022
Medplum offers an open-source developer platform designed to simplify healthcare application development. It focuses on streamlining workflow automation, secure data storage, and providing UI components tailored for healthcare.

Hydra

Pre Seed Round in 2022
Hydra is an open source Snowflake alternative that transforms Postgres into a fast, scalable data warehouse. With Hydra, engineers can standardize both transactional and analytics workloads around the familiar Postgres syntax, tools, and ecosystem without app code changes. Hydra offers a fully managed cloud instance with columnar storage and high throughput writes. In addition, Hydra decouples Postgres' query layer from compute and storage to enable developers to run Postgres queries across any database. Hydra's mission is to end vendor lock-in and standardize on developers' favorite open-source database, Postgres.

Netmaker

Venture Round in 2022
Netmaker is an open-source platform with a modern virtual networking solution on wireguards.

Hydra

Seed Round in 2022
Hydra is an open-source data warehouse that specializes in columnar storage, vectorization, and parallelized query execution

Athens Research

Seed Round in 2021
Athens Research operates a private and extensible knowledge graph designed for research and notetaking. It is developed as an open-source alternative to Roam Research, emphasizing community-driven contributions. The platform allows users to organize, connect, and access information efficiently, fostering collaboration and enhancing productivity in research activities. By providing a flexible and user-friendly environment, Athens Research supports individuals and teams in managing their knowledge more effectively.
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