Spark, formerly known as Telecom, has bought a 26 per cent stake in Hawke's Bay-based telecommunications company NOW.
NOW CEO Hamish White said the stake from its competitor was a vote of confidence it was "on the right track" and would use proceeds of the sale towards its ongoing rollout of broadband and calling services in the lower North Island.
NOW has grown 40 per cent for each of the past two financial years.
"I see Spark's interest as a real show of confidence in NOW's proven ability to understand our local customers and give them the service they deserve," he said. "They appreciate our 'high service, high value' business model that ensures our customers get the most from their technology."
Founded in Hawke's Bay in 2002, NOW provides broadband and calling services to business and residential customers throughout Hawke's Bay, Wellington, Kapiti, Rotorua, Taupo and Whakatane.