Fibre broadband provider CityFibre has confirmed that the number of direct fibre-connected customer premises now stands at 3,962.
This compares with 1,200 in 2015, while the number of new connections sold and acquired has gone up from 1,110 to 5,063 over the last year.
In its latest trading statement, CityFibre also revealed that completed route kilometres of ducted fibre increased from 743 km in 2015 to 3,383 km in 2016.
These developments helped the company's turnover go up by 140 per cent to £15.4 million last year, while gross profit rose by 145 per cent to £13.5 million.
Greg Mesch, Chief Executive of CityFibre, commented: "2016 was truly a transformational year for CityFibre.
"Alongside delivering on our stated growth strategy, the acquired network footprint has accelerated our original business plan by up to seven years."
Mr Mesch noted that over the last year, CityFibre has more than doubled its contracted revenue base and added 29 new cities.
He said the company now has a "significant presence" in 42 cities across the UK, while the "rapid commercialisation" of its assets shows there is "strong demand for an alternative to BT Openreach at a national level".
"We continue to see significant levels of demand from both business and public services sectors alongside increasing interest from mobile operators and residential broadband providers," Mr Mesch said.
He added that since the regulatory and political landscapes now both favour alternative fibre investment, CityFibre has "never been better placed to capitalise on expanding its existing footprint and a growing number of near term strategic opportunities".