Negociants UK's sales and marketing director Guy Wilkes has become acting MD.
Wilkes will take the place of Michael Cox until a permanent replacement can be found. Cox is leaving the business in May to become MD of Wines of Chile.
Both he and Wilkes have been with Negociants since they helped set it up 12 years ago.
Until the MD post is filled, Wilkes and executive account manager Chris Smith will handle all national account business.
Wilkes said: "The business is in great shape and we will continue to work to build the reputation of our Australian and New Zealand wines."
Negociants UK distributes wine brands such as Oxford Landing, Vasse Felix and Wirra Wirra to both on and off-trades.

Wilkes will have some responsibility for national multiple retail accounts