# Thamesis

Thamesis is a Single Family Office based in London, United Kingdom.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** London, United Kingdom
- **Region:** Europe
- **Address:** London, United Kingdom
- **Assets under management:** Undisclosed
- **Website:** thamesis.com
- **LinkedIn:** https://uk.linkedin.com/company/thamesis-limited

## Regulatory record

- **Reports private funds:** No

## About

Sir Martyn Arbib founded Thamesis after building Perpetual. Family members Annabel Nicoll, Benjamin Arbib and James Arbib serve as directors. The office maintains a multi-generational mandate centered on capital preservation. Thamesis deploys across private equity, real estate, hedge funds, private credit, infrastructure and natural resources. It executes through direct co-investments and SPVs alongside fund commitments. Confirmed geographic reach covers Europe and North America. Sector exposure includes AgriTech & FoodTech, Energy Transition & Renewables, Industrial Tech, Mobility & Transportation, WaterTech and FinTech. The firm lists 61 Grosvenor Street and a London residential portfolio among its real assets. It also holds interests in thoroughbred racing and the River & Rowing Museum. Cressida Myers was appointed CEO in 2026. Thamesis operates with an advisory board that includes Lord Massey of Hampstead. Governance separates investment decisions from the philanthropic vehicles The Annabel Arbib Foundation, The A Team Foundation and The Tellus Mater Foundation.

## Sectors

- AgriTech & FoodTech
- Circular Economy
- Energy Transition & Renewables
- Industrial Tech
- Mobility & Transportation
- Supply Chain & Logistics
- WaterTech
- FinTech

## People

- Sir Martyn Arbib — Founder
- Annabel Nicoll — Director
- Benjamin Arbib — Director
- James Arbib — Director
- Cressida Myers — CEO
- Lord Massey of Hampstead — Advisory Board Member

## Questions

### Who runs investment decisions at Thamesis?

Cressida Myers serves as CEO. Sir Martyn Arbib founded the office. Family directors Annabel Nicoll, Benjamin Arbib and James Arbib participate in oversight.

### Does Thamesis participate in fund commitments or only direct deals?

Thamesis uses both fund commitments and direct co-investments through SPVs.

### Which sectors does Thamesis target?

Confirmed focuses include AgriTech & FoodTech, Energy Transition & Renewables, Industrial Tech, Mobility & Transportation, WaterTech and FinTech.

### How is Thamesis related to philanthropic structures?

The office maintains separate vehicles including The Annabel Arbib Foundation, The A Team Foundation and The Tellus Mater Foundation.

## Related profiles

- [Thai Martin Group](https://altss.com/profile/thai-martin-group)
- [Thara Investment Company](https://altss.com/profile/thara-investment-company)

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Last updated: 2026-08-10T15:54:10.904Z

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