The UK competition watchdog has provisionally found that Nexfibre’s £2bn purchase of rival Netomnia could substantially reduce competition in wholesale fixed broadband.

The Competition and Markets Authority has asked Nexfibre and Netomnia’s owner, Substantial, to propose ways to address its concerns by 16 October. The CMA plans to consult publicly on those proposals before making a final decision.

Nexfibre, backed by Liberty Global, Telefónica and InfraVia Capital Partners, announced the deal in February. It said the acquisition would extend its network to about eight million premises by the end of 2027, creating a larger challenger to BT’s Openreach.

Nexfibre’s shareholders disputed the CMA’s interim findings, arguing that the deal would bring £3.5bn in international investment and help expand full-fibre coverage. Rival provider Cityfibre has called on the watchdog to block the purchase.