In a joint statement at the time, Queenstown Rafting and Challenge Rafting said they had voluntarily suspended rafting operations.
The two companies had worked together to promote the event.
Paroci's raft had overturned at the "Toilet" rapid around 3.45pm, they said.
The rapid was about three quarters of the way through the rafting trip.
The two outfits said rafts overturning was not unusual for grade 4 to 5 rivers.
Queenstown Rafting General Manager Luke Taylor said he and his staff are devastated by the incident.
"Our hearts go out to our guests and the families of those involved in this. Both our companies wish to offer the group our sincere condolences and ongoing support."
Police would continue to make inquiries on behalf of the coroner.
Maritime New Zealand would be assisting in this inquiry, as well as conducting its own investigation into what happened.