There were 47 people on the volcano when it erupted in December 2019, most of them international tourists.
Twenty-two people were killed and many others were seriously injured.
The others charged were: the island's owner Whakaari Management Limited and its directors Andrew, James and Peter Buttle; GNS Science; the National Emergency Management Agency; White Island Tours Limited; Volcanic Air Safaris Limited; Aerius Limited; Kahu NZ Limited; I D Tours New Zealand Limited; and Tauranga Tourism Services Limited.
The remaining 12 defendants have all pleaded not guilty and a four-month trial has been set to start in July 2023.
The charges do not relate to events on the day of the eruption, or the rescue efforts.