Hosking has 339,600 cumulative listeners aged 10+ between 6am and 8:30am, compared to The AM show's 135,300.
ZB evening host Marcus Lush also performed extremely well in the survey and was number one in all markets across New Zealand.
NZME and its partners now has over 2 million listeners and the company's stations - which include ZB, ZM, The Hits and Flava - added 54,500 new listeners in the latest survey.
"This is an overall market share increase of 1.8 percentage points for NZME and Partners whilst MediaWorks went backwards for the second survey in a row... I'm particularly excited that alongside our radio partners, we are better reflecting the new diversity of New Zealand's population," said NZME's chief commercial officer Laura Maxwell.
NZME managing editor Shayne Currie says ZB continued its dominance - having been number one since 2003.
"This means we've again retained the number one crown, while the Mike Hosking Breakfast is the biggest breakfast show in the country," Currie said.
"Marcus Lush has also had a phenomenal result, being number one in all markets across the country," he said.
Another NZME station, Radio Sport, enjoyed the biggest growth of any station with an additional 21,200 listeners in the survey.
This was a testament to both the station's talent and NZME's integrated newsroom, Currie said.
"This absolutely shows the power of NZME. Our broadcasters, producers and reporters are across everything - delivering high-quality exclusive news and sport content and interviews that people want to listen to."
NZME also publishes the New Zealand Herald.