Spark boss Simon Moutter has resigned, with customer director Jolie Hodson to take over in July.
Moutter will finish up as managing director and chief executive of Spark on June 30 and Hodson will take over on July 1.
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Spark chair Justine Smyth said Moutter had always had a five to seven-year term as managing director in mind and the board had already been considering a successor.
"The Board are particularly pleased that we've been able to achieve a very smooth and professional succession arrangement, and in particular we are delighted that Jolie Hodson has been appointed as Simon's successor," she said.
Smyth said Moutter had led the company through an impressive transformation since he took up the managing director role in 2012.
"In almost every respect, Spark today is a vastly different company to the one that Simon re-joined in 2012."
Moutter said he hasn't made any decisions about what to do once he finishes at Spark, aside from spend more time with his family.
"I've given my absolute best to putting Spark onto a positive track over the last seven years, so the company can fully deliver on its purpose to 'help all of New Zealand win big in a digital world'.
"I feel it's the right time to pass the leadership baton on and I am delighted the Board has chosen an outstanding leader in Jolie to succeed me."