Improbable is a London-headquartered simulation and virtual-world technology company founded in 2012 by Herman Narula, Rob Whitehead, and Peter Lipka while at the University of Cambridge. The company built SpatialOS, a distributed cloud platform designed to run massive multiplayer game worlds and complex simulations such as defence training environments.
Improbable became one of the highest-profile UK unicorns of the 2010s when it raised $502 million from SoftBank Vision Fund in 2017 at a reported valuation of more than $2 billion, making it one of the largest UK Series B rounds on record. The principal UK entity, Improbable Worlds Ltd., is a private limited company registered at Companies House.
The company subsequently expanded into defence simulation through a separate subsidiary, Improbable Defence, and into web3 and metaverse infrastructure through MSquared.
Improbable has had a turbulent commercial history, with SpatialOS adoption among games studios slower than initial pitches anticipated and significant restructuring across business lines, but the defence and simulation lines have continued to win UK Ministry of Defence and US Department of Defense contracts.
The company remains private and is one of the few UK tech businesses to have built deep relationships with the UK and US defence-industrial bases.
Improbable is a structurally interesting case for several reasons that bear on UK corporate-structure choices. First, the 2017 SoftBank round, at the time the largest Series B in European tech history, demonstrated that UK Ltds can accommodate single-investor mega-rounds without immediate restructuring under a US top-co; SoftBank's investment was made into Improbable Worlds Ltd.
as a UK English-law preferred share class, with all rights, ratchets, and protective provisions captured in the articles filed at Companies House.
Second, the company's subsequent diversification into defence created a structural choice between operating Improbable Defence as a division of the main UK Ltd, a separate subsidiary, or a fully ring-fenced entity with its own security clearances.
Improbable opted for a subsidiary structure that supports National Security and Investment Act 2021 compliance, MOD List X facility security clearances, and UK CMA scrutiny under the foreign-direct-investment regime.
Third, Improbable's metaverse subsidiary MSquared and its associated MML token raised difficult questions about how UK companies should structure crypto-economic ventures when UK FCA registration for crypto-asset firms remains tightly scoped.
Fourth, Improbable's growth predates the EIS gross-asset thresholds becoming binding for most rounds, meaning early angel investors did benefit from EIS relief, while later SoftBank capital was institutional and outside the scheme. Improbable has not pursued an IPO; AIM is unlikely given scale and capital intensity, and the LSE Main Market or a US listing remain theoretical future options.
Reverse-takeover into a listed cash shell is a route specifically used by smaller UK tech companies seeking liquidity but is rarely chosen by unicorns of Improbable's scale.
Improbable Worlds Ltd. is a private limited company incorporated in England and Wales and registered at Companies House, with its head office in Farringdon, London.
Yes. SoftBank Vision Fund led a $502 million round in Improbable in 2017, at the time the largest Series B in European tech history, and SoftBank holds a substantial preferred-share position disclosed at Companies House.
Improbable Defence is a UK subsidiary that delivers simulation and synthetic-environment software to the UK Ministry of Defence and US Department of Defense, operated as a separate entity to support security clearances and FDI compliance.
Improbable has not announced a listing. Future routes could include the LSE Main Market under the 2024 reformed regime or a US listing, although the company remains private.
