Borderlink, which trades as GoFibre, has received a further £164m investment from Gresham House to accelerate its full fibre rollout in Scotland and the north of England.
Full fibre provider Call Flow has closed a £26.6m-plus growth investment round from European investors.
East Peckham-based Call Flow will bring full fibre broadband under the Trooli brand to more small towns in south east England.
The investment is the first step in Trooli's plan to build full fibre networks that pass over 500,000 premises in the next five years, starting in towns and villages across Kent.
The company, which was founded by former BT exec Andy Conibere in 2002, currently operates FTTC network passing over 12,000 premises, with existing FTTH networks passing more than 6,000 premises.
"There is an urgent need for the higher broadband speeds and more reliable services that only true fibre offers over copper alternatives, particularly in small towns where Internet users feel left behind," stated Trooli CFO Ashley Atkins.
"This investment will enable us to ramp up our build rate and use our rapid deployment method to meet this demand with our ultra-fast broadband services."
Marcus Allchurch, Partner at Acuity Advisors, which advised Call Flow on the investment, added: "In an increasingly crowded marketplace for fibre growth businesses, it is vital that good teams, such as Andy and his team, are able to clearly differentiate themselves to maximise options and terms."