British companies established in 2005

British video game developer

Scottish video game development studio

Mediatonic Limited is a British video game developer based in London. The company was founded in September 2005 by Brunel University students Dave Bailey and Paul Croft, releasing their first game, Snowman Salvage in December that year. Initially a work-for-hire studio for Flash games, Mediatonic has developed original games for other platforms, including Murder by Numbers and Fall Guys. As of June 2020, Mediatonic employs 230 people in four studios and is part of Tonic Games Group, which is a subsidiary of Epic Games since March 2021.

British video game company

British entertainment company

British video game developer and publisher

thumb|xCORE XS1-AnA processor XMOS is a fabless semiconductor company that develops generative systems-on-chips designed to integrate control, input/output, digital signal processing, and artificial intelligence functions. The company's XCORE platform enables users to generate customizable system-on-chips with real-time reconfigurability and deterministic parallel architecture, enabling developers to execute multiple tasks simultaneously.

Collabora Ltd is a private open-source software consulting company headquartered in Cambridge, United Kingdom, with an additional office in Montreal. It provides consulting, training, and product development services to organizations using open-source technologies.

International broadcasting and media services company

Zopa Bank Ltd. () is a British online bank which offers deposit accounts, personal loans and credit cards. It began as the world's first peer-to-peer lending company in 2005 and gained a full banking licence in 2020. The peer-to-peer side of its business closed in December 2021.