Spark NZ yesterday briefly reclaimed the top spot as the most valuable company on the NZX, a position it once firmly held in its previous incarnation as Telecom.
Shares in Spark have surged 33.6 per cent this year to $3.12.
Spark NZ chief executive Simon Moutter said the rising share price indicated the company's rebrand and new focus was working.
"I think [the share price growth] is mostly to do with our clear articulation of strategy and solid execution against that," Moutter said.
"The commentary from the public has been very positive around the way we handled the rebranding of the organisation, and certainly our internal measurement of progress is indicating that the customer response is very positive," he said.