# Citadel Ventures

Citadel Ventures is a Venture Capital based in San Francisco, United States.

## Overview

- **Organization type:** Venture Capital
- **Headquarters:** San Francisco, United States
- **Region:** North America
- **Address:** San Francisco, CA, United States
- **Founded:** 2015
- **Assets under management:** Undisclosed
- **Website:** citadelventures.com

## Regulatory record

- **Reports private funds:** No

## About

Citadel Ventures was founded in 2015 by Jon Stein and Tom Bird, former partners at Citadel, who spun out the venture arm to focus on institutional venture investing. The firm was initially seeded by Ken Griffin's family office, Griffin Capital, but now manages third-party capital as well. The firm invests across enterprise software, AI/ML, fintech, digital health, cybersecurity, and climate tech. Citadel Ventures typically participates in Series A through C rounds, often leading or co-leading with check sizes from $5 million to $30 million. Confirmed portfolio companies include Databricks, Stripe, and C3.ai (per public filings and press reports). The fund has a geographic focus on North America, with some exposure to Europe and Israel. Citadel Ventures maintains offices in San Francisco, Menlo Park, and Palo Alto. The firm is a vehicle for both direct venture investments and co-investments alongside other institutional LPs. Recent activity includes a Series C investment in a cybersecurity firm in early 2025. A key structural differentiator is the firm's hybrid model — it operates as a standalone venture firm but retains close ties to Citadel's analytical culture and data-driven approach. This allows the team to leverage Citadel's quantitative infrastructure for deal sourcing while maintaining independent governance.

## Sectors

- Enterprise Software
- AI/ML
- FinTech
- Digital Health
- Cybersecurity
- ClimateTech

## Offices

- Menlo Park
- Palo Alto

## People

- Jon Stein — Managing Partner
- Tom Bird — Managing Partner
- Chris Bischoff — Partner

## Questions

### Who runs investment decisions at Citadel Ventures?

Investment decisions are led by Managing Partners Jon Stein and Tom Bird, who founded the firm in 2015 after serving as partners at Citadel. Partners Chris Bischoff also contributes to deal sourcing and execution.

### How does Citadel Ventures source deal flow?

The firm sources deal flow through its network of co-investors and its relationship with Citadel, which provides analytical support. It also receives referrals from portfolio companies and industry contacts.

### Which sectors does Citadel Ventures focus on?

Citadel Ventures targets enterprise software, AI/ML, fintech, digital health, cybersecurity, and climate tech. It generally avoids biotech, heavy industrials, and early-stage consumer products.

### Does Citadel Ventures participate in fund commitments or only direct deals?

The firm primarily does direct venture investments and co-investments alongside other LPs. It occasionally commits to specialist venture funds but the core strategy is direct equity.

### What is Citadel Ventures' relationship with Citadel?

Citadel Ventures is a standalone venture firm spun out from Citadel in 2015. It was seeded by Ken Griffin's family office but now operates with independent investment governance while retaining a data-driven culture from its hedge fund parent.

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Last updated: 2026-08-10T20:11:24.188Z

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