Tobias Citron

Partner, Cybersecurity

Thesis

The threat of cybersecurity in an AI world is existential, but we are plagued with a history of incremental solutions that won't suffice. Now is the time to build businesses that solve society's biggest digital risks and make us all safer.

About

Tobias joined Primary after helping build Radicle Labs, a private markets research firm spun out of Prehype. He earned his MBA from Wharton and holds an AB in Public Policy from Princeton. Tobias is drawn to founders tackling complex technical problems with elegance and precision, bringing a research-driven mindset to every partnership. Born and raised on the Upper West Side, he's always happy to debate the best pizza places and commiserate about New York sports teams.

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Investments

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Maximizing GPU performance for AI workloads

Founders

Alon Yariv
Omer Landau

View company
Invested
2024
Stage
Exited

Maximizing GPU performance for AI workloads

Aquired by Crusoe. Atero boosts GPU efficiency for AI through its novel unified memory approach. Now part of Crusoe, it powers scalable, energy-efficient infrastructure for next-gen AI.

Founded
2024
HQ
Tel Aviv, Israel
Investor
Brian Schechter
Tobias Citron
Invested
2024
Founders

Alon Yariv
Omer Landau

Stage
Exited
Visit Website
Infrastructure

The fastest path to production AI

Founders

Misha Herscu

View company
Invested
2021
Stage
Seed

The fastest path to production AI

Cutting-edge AI is accessible for the 1%, but hard to use for the 99%. Cake bundles open source AI to help customers reach production faster at lower cost.

Founded
2021
HQ
New York, NY
Investor
Brian Schechter
Tobias Citron
Invested
2021
Founders

Misha Herscu

Stage
Seed
Visit Website
Infrastructure

Identity security for the agentic era

Founders

Archit Lohokare
Kash Ivaturi

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Invested
2025
Stage
Seed

Identity security for the agentic era

Helping enterprises drive AI adoption by providing visibility, demonstrating governance and eliminating the access risk of AI Agents.

Founded
2025
HQ
San Mateo, CA
Investor
Tobias Citron
Invested
2025
Founders

Archit Lohokare
Kash Ivaturi

Stage
Seed
Visit Website
Cybersecurity

A compute stack powering the fastest inference in the world

Founders

Gavin Uberti
Chris Zhu
Robert Wachen

View company
Invested
2023
Stage
Series B

A compute stack powering the fastest inference in the world

Etched is tackling one of the largest markets in history - AI inference. Their first chip, Sohu, deliver low latency, high-throughput inference for transformers.

Founded
2022
HQ
San Francisco, CA
Investor
Brian Schechter
Tobias Citron
Invested
2023
Founders

Gavin Uberti
Chris Zhu
Robert Wachen

Stage
Series B
View Company Page
Visit Website
Infrastructure

Etched’s Series A to revolutionize AI hardware with purpose-built LLM chips

Control plane for platform teams managing Kubernetes at scale

Founders

Sam Weaver
Michael Guarino

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Invested
2020
Stage
Seed

Control plane for platform teams managing Kubernetes at scale

Enterprise kubernetes fleet management for the most complex, sophisticated kubernetes environments

Founded
2020
HQ
New York, NY
Investor
Brian Schechter
Tobias Citron
Invested
2020
Founders

Sam Weaver
Michael Guarino

Stage
Seed
Visit Website
Infrastructure

Automated data protection, at scale

Founders

Elizabeth Nammour

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Invested
2023
Stage
Series A

Automated data protection, at scale

Teleskope automates data security and privacy across your entire data footprint. Their platform arms security teams, once drowning in complexity, with powerful tools that manage risk and remediate issues at the source.

Founded
2023
HQ
New York, NY
Investor
Brian Schechter
Tobias Citron
Invested
2023
Founders

Elizabeth Nammour

Stage
Series A
View Company Page
Visit Website
Cybersecurity

Founder Testimonial

Tobias brings the kind of partnership every founder hopes for: clear, insightful, and deeply human. He pushed us to think bigger while staying grounded, and his belief in us was pivotal to scaling with ambition and staying true to our mission.

Alon Yariv
CEO & Co-Founder

Associate

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Writing

Investing in the reinvention of cybersecurity

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