While stoked with his victory yesterday, the 18-year-old said it also belonged to all those who had supported him to get to this stage, including his late father.
His father Paul Thompson - who had introduced him to the sport - died after a battle with throat cancer in July last year.
"I've used that as motivation for me to practice and work hard, because he got me into it and he was driving me a lot of the time. He's pushing me at the moment so its awesome to get a win, and I know he'd love this one."
As well as winning the championship - in his last chance to enter the age group - it was thought that Mr Thompson was the first Hawke's Bay golfer to take out the title, at least in recent history.
"There's some big, big names on that trophy so just to be in company with them is something I can't really believe," the 18-year-old said. These names include Greg Turner (1981), Michael Campbell (1987), Michael Long (1988), Adam Scott (1996), Steven Bowditch (2000) and Jason Day (2004).
Encouraged by his solo father, his golfing career began as an 11-year-old on the Te Pohue course.
"I'd just go round by myself, whacking the ball around the paddock with the sheep all on the course."
He developed his skill over the years, moving to Maraenui Golf Club before starting at Napier Boys High School. But earlier this year Mr Thompson had thought about giving up the sport.
"I took time off and thought, this is not what I wanted to do, and went back to playing cricket like I used to do."
But he knew his dad would not have wanted him to "slob around and be sad for a whole year".
"I knew he'd want me to get out and be motivated and whatnot so that's what I started doing".
One tournament brought the spark back for the 18-year-old, and after he picked up a sponsorship from coach Scott Overend, "I haven't looked back since."
"I owe this victory to [Mr Overend]. Just as much as it is mine, its as much his."
It was an intense regime alongside his coach that brought Mr Thompson's game back up.
On top of golf sessions up to five times a week, Mr Thompson went on a diet programme, and began going to the gym around four times a week.
Mr Overend was not the only one backing the young golfer - as well as support from his two brothers, he counted himself lucky to have an "awesome" support network.
His other sponsors included Beth Shan, and Ryan of RW Construction - who had employed Mr Thompson around his golf commitments.
Knowing people had faith in him motivated Mr Thompson: "when you're out practicing sometimes...it just really gets to you, and you're not enjoying it. But then you think back to, for me it's dad and that support network I've got, and who you're doing it for.
"But obviously wins like this make it all worthwhile. It's good if this can help pay back a lot of effort that a lot of people have put into me, its awesome to repay them with a victory like this."
Yesterday it had been a nervous start for the teenager, who made the turn at two-over par.
"I'm very happy after a shaky start with a couple of bogeys on the front nine, but coming home in 33 was pretty cool and very happy with the birdie, birdie finish."
There was no better way to kick start the back nine than with a clutch eagle on the par five, tenth hole.
"I don't normally take driver on that hole, but I then stuck a three iron in there and backed it up with a 15-foot putt, so it was a fun start to the back nine."
The teen now wants to spend the next few seasons in the country, where he will aim to take this form in to the Jennian Homes Charles Tour and grow his game to the next level.
"Hopefully this win opens a few more doors for me going into next year," he said.
As for how his dad would feel about yesterday's win - "he'd be bloody stoked".
