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Thamesis
Sir Martyn Arbib founded Thamesis after building Perpetual. Family members Annabel Nicoll, Benjamin Arbib and James Arbib serve as directors.
Thamesis
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.
General information
Firm type
Single Family Office
Location
Region
Europe
Country
United Kingdom
City
London
Corporate office
London, United Kingdom
Principals
Sir Martyn Arbib
Founder
Annabel Nicoll
Director
Benjamin Arbib
Director
James Arbib
Director
Cressida Myers
CEO
Lord Massey of Hampstead
Advisory Board Member
Sector focus
Frequently asked 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.
Where does the underlying wealth come from?
Sir Martyn Arbib founded Perpetual, the source of the family wealth now stewarded by Thamesis.
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.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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