The company, which supplies broadband and data connections, mobile services, fixed telephony and hosted phone systems, said strong demand in the UK led to “significantly” higher revenue and earnings per share in the year to the end of December 2018.
The group also reported progress in its expansion into Continental Europe with the acquisition of telecoms firm Dean One in the Netherlands in October last year.
Dean One announced a strategic partnership with T-Mobile in the Netherlands in December and launched a mobile wholesale proposition across the Dutch market.
“We are pleased that Gamma has continued to grow strongly in the UK while simultaneously increasing our addressable market by expanding into Continental Europe,” said chief executive Andrew Taylor.
Taylor said the group continued to grow its market share in its online and cloud phone exchange systems (PBX). In March, the company will launch Collaborate, a unified communications product that will be available as a bolt-on module to the Horizon cloud PBX product.
Gamma said it ended the year with a net cash balance of £35.5mln, compared to £31.6mln last year.
In morning trading, shares rose 1.7% to 810p.