Mistakidis worked for six years trading in non-ferrous metals for Cargill. In 1993, he joined Marc Rich & Co in 1993, shortly before there was a management buyout and it was renamed Glencore. He worked in the zinc, copper and lead department, rising to become a co-director in 2000. He became a Billionaire with the May 2011 Glencore IPO.
