The race is this year part of the 10-event Ultra-Trail World series.
Race director Paul Charteris said he was blown away by the news of the investment. "It's unbelievable and just perfect timing," he said yesterday.
"We've got a massive crowd here at registration and I can't wait to tell them. It's amazing.
"I thought this race would grow a bit faster than it has but in six years it's become such an emerging international event. This is hugely rewarding. It will raise the profile for the event."
Mr Charteris said he would be targeting more runners from the United States, Australia, China and Japan as trail runs are popular in those countries.
Athletes competing this year have already commented on the location to Mr Charteris.
One of the favourites for today's event, Michael Wardian, said he was "speechless" after Thursday's fun run, which ran through Te Puia.
"He said it was like running through a fairytale landscape," Mr Charteris said.
Mr McClay said he was thrilled for the event to get the investment.