[6][7] CityFibre is based in London, and is co-owned by Antin Infrastructure Partners, Goldman Sachs Asset Management, Mubadala Investment Company and Interogo Holding.

[12][13] Over 35 Internet service providers use CityFibre for their network, including Andrews & Arnold, BrawBand, BrillBand, Facto, FibreHop, Gigabit Networks, Giganet, IDNet, Link Broadband, No One, Octaplus, RunFibre, TalkTalk, Toob, Vodafone, Yayzi, YouFibre, and Zen Internet.

[18][19] In 2018, CityFibre announced that Connect Infrastructure Bidco Limited (a newly formed company indirectly jointly-controlled by a consortium formed by Antin Infrastructure Partners and West Street Infrastructure Partners, a fund managed by Goldman Sachs) had purchased a majority share in the company at 81 pence per share (a 92% premium of the public price of market close at 42 pence per share) and public trading of the company was cancelled on 22 June 2018 taking CityFibre into private ownership.

[20][21] At the beginning of February 2023, the CEO Greg Mesch announced a company restructuring, blaming the UK's "struggling economy" causing rising costs for their business.

With the target that the fresh bright colours raise awareness about full-fibre broadband and separate CityFibre from their Copper based competition.

[11] From the early 2020s, CityFibre has been rapidly expanding its access across the UK, with plans to cover one-third of the country with gigabit Internet by 2025.

[28][8][6][4][29] In 2022, the company completed successful trials of 2 Gbit/s residential services in York, with further plans to increase speeds up-to 10 Gbit/s using XGS-PON technology.

[35][36] In January, CityFibre reported that they were building at the rate of 22,000 premises per week, across 75 metropolitan areas, with a 83% increase in their network footprint from 2022.