CityFibre, the UK’s largest independent full-fibre platform, has secured £2.3 billion (US$3.1 billion) in new financing to accelerate its growth.

This includes £500 million (US$674.2 million) in new equity from existing shareholders such as Infrastructure at Goldman Sachs Alternatives, Antin Infrastructure Partners, Mubadala Investment Company, and Interogo Holding.

The company also expanded its debt facilities by £960 million (US$1.3 billion), supported by lenders including ABN AMRO, NatWest, and Société Générale.

An £800 million (US1 billion) accordion facility was established to support acquisitions.

The investment will allow CityFibre to broaden its network and connect hundreds of thousands of additional customers.

🔗 Source: CityFibre

🧠 Food for thought

1️⃣ Private capital’s evolving role in UK fiber infrastructure

CityFibre’s journey demonstrates how private infrastructure investment in UK telecom has dramatically scaled in recent years.

When Antin Infrastructure Partners and Goldman Sachs acquired CityFibre for £538 million in 2018, taking it private, they signaled that fiber networks required patient capital beyond public markets 1.

This private ownership model has enabled CityFibre to secure increasingly ambitious financing rounds, from a £1.12 billion debt package in 2018 to this latest £2.3 billion round, showing how investment appetite has grown substantially 23.

The participation of sovereign wealth funds like Mubadala and infrastructure specialists like Antin reflects the evolving classification of fiber networks as essential infrastructure rather than traditional telecom investments, attracting different capital sources than traditional telcos 3.

This financing approach aligns with broader UK infrastructure investment trends, with total market sector infrastructure investment reaching £20.3 billion in 2024, a 16.9% increase from the previous year 4.

2️⃣ Consolidation reshaping UK’s fiber landscape

CityFibre’s dedicated £800 million accordion facility for acquisitions signals a new phase of consolidation in the UK’s fragmented alternative network (“altnet”) sector 3.

The company has already executed this strategy through recent acquisitions, including Lit Fibre and Connexin’s fiber assets, building toward its 8-million premise target while absorbing smaller competitors 3.