Roberson founded Buckingham in 1974 and grew it into one of the UK’s leading wine importers.
In 1994 he sold 25% of the company to the European wine group Schenk, and a further 50% five years ago.
He has now sold the final 25%, making Buckingham a fully owned subsidiary of the group.
Roberson will now concentrate fully on his other business, retailer and wholesaler Roberson Wine.
Buckingham Schenk will continue to be run by managing director Jon Pepper, who said: “This is the end of an era for Buckingham, as Cliff’s unique presence in the office will be sorely missed.
“Schenk are a fantastic partner for us, however, and being part of the group positions us quite uniquely in the UK as the direct sales office of Schenk’s wineries in Italy, Spain and France.”
Roberson will step down as chairman on his 72nd birthday at the end of August.