CityFibre

CityFibre, open access fibre optic network in the United Kingdom

CityFibre is a fibre optic infrastructure operator headquartered in London, founded in 2011. The company presents itself as the UK's largest open access, full fibre only operator, with active services in cities, towns and villages across the country. Its network is designed to serve homes, businesses, the public sector, landlords and mobile operators.

Infrastructure and technical capabilities

CityFibre's network is built on XGS-PON technology and is conceived as a national platform capable of supporting speeds of up to 8.5 Gbps. According to the company's information, the network already passes more than 4.5 million premises in the UK. The company describes its infrastructure as independent, with virtually unlimited capacity, ease of upgrade and state-of-the-art fibre exchanges.

Open access model and partner providers

CityFibre does not sell directly to the end user: it manages the fibre network, while the broadband service is provided by the provider each customer signs up with. The company states that users can choose from more than 30 broadband providers once the network is available in their area. Among its partners is Sky, with an agreement to offer Sky Full Fibre Broadband over CityFibre's network.

Segments served

The company's offering is organised into several segments: homes, businesses, public sector and landlords. The company also works with mobile operators. Its network serves residential, business, mobile and public sector sites across the country.

Projects and corporate activity

The company participates in the Project Gigabit programme. Its recent track record includes the strategic sale of Entanet and a new wholesale partnership, announced on 1 July 2026, as well as the acquisition of Lit Fibre, assuming full ownership from Newlight Partners. The company also reported its first full year of profitability, with more than 500,000 customer connections.

Structure and ownership

CityFibre Holdings Limited is registered in England, with its registered office at 15 Bedford Street, London, WC2E 9HE, and company number 07488363. The company is jointly owned by Antin Infrastructure Partners, Goldman Sachs Asset Management, Mubadala Investment Company, Interogo Holding, Newlight Partners and PATRIZIA's European Infrastructure Fund II.

Social and educational initiatives

Among its disclosed initiatives is a programme to improve the digital literacy of one million primary school students, announced on 23 June 2026. The company publishes corporate reports, information on its gender pay gap and its commitment to women in the workplace, as well as its responsible business strategy.

Location and contact

15 Bedford Street, London WC2E 9HE · Phone: 0800 298 6267