# Euclidean Capital

Euclidean Capital is a Single Family Office based in New York, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** New York, United States
- **Region:** North America
- **Address:** New York, NY, United States
- **Founded:** 2009
- **Assets under management:** 21.6B (Altss estimate)
- **Website:** euclidcap.com
- **LinkedIn:** https://www.linkedin.com/company/euclidean-capital-llc

## Regulatory record

- **Reports private funds:** No

## About

Euclidean Capital was founded in 2009 by James Simons after his career building Renaissance Technologies. Marilyn Simons serves as co-chair of the Simons Foundation, the primary philanthropic vehicle tied to the family. The firm deploys capital across hedge funds, private equity, venture capital, and infrastructure. Asset classes include Energy Transition & Renewables, FinTech, Digital Health, and PropTech. Confirmed co-investors include Viking Global Investors and Team8. Geographies covered are North America, Europe, Asia, and Oceania. Investment stages range from Series A through buyouts. The team size remains undisclosed. Offices sit at 160 Fifth Avenue and 149 Fifth Avenue in New York. Adjacent vehicles include the Simons Foundation and Math for America. No operational events from the last 24 months appear in available records. Euclidean Capital maintains separation between investment activities and the Simons Foundation's grant-making. This structure routes philanthropic commitments through dedicated entities rather than direct family-office balance sheet allocations.

## Sectors

- Energy Transition & Renewables
- FinTech
- Digital Health
- AgriTech & FoodTech
- PropTech

## People

- James H. Simons — Founder
- Marilyn Simons — Co-chair of the Simons Foundation

## Questions

### Who runs investment decisions at Euclidean Capital?

Marilyn Simons holds oversight through her role as co-chair of the Simons Foundation. Day-to-day investment management details are not publicly disclosed.

### Does Euclidean Capital participate in fund commitments or only direct deals?

The firm uses both fund commitments and direct co-investments. Confirmed co-investors include Viking Global Investors.

### What investment stages does Euclidean Capital typically target?

Stages include Series A, Series B, Series C, growth equity, and buyouts.

### How is Euclidean Capital related to the Simons Foundation?

The foundation serves as the family's primary philanthropic vehicle and shares leadership with Marilyn Simons.

## Related profiles

- [Johnson Investment Counsel](https://altss.com/profile/johnson-investment-counsel)
- [Abante Asesores](https://altss.com/profile/abante-asesores)

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Last updated: 2026-08-10T15:58:45.833Z

Canonical page: https://altss.com/profile/euclidean-capital-james-simons-family-office

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