Missing businessman Grant Atkinson has been found alive and well by a police search team.

Mr Atkinson, 48, disappeared from after he left his Campbells Bay home on Auckland's North Shore to drive to work in Newmarket on Tuesday.

He was found in Huapai Domain at 8.45am today by a police and search and rescue team. Police said he was dishevelled and slightly disoriented but otherwise physically well.

Inspector Les Paterson says Mr Atkinson would remain with police this morning before being medically assessed.

"We believe he's been sleeping rough in the area, though not in the domain itself, for the past four nights since his car was parked at the Huapai Domain on Tuesday evening," Mr Paterson said.

"At this point there's no reason to believe anyone else had anything to do with Mr Atkinson's disappearance. We'd very much like to thank members of the public for their assistance in the search for him and we're delighted that he has not come to any obvious harm."