Sir Chay Blyth announced Uniysis/ EMC, Sony and Stelmar Shipping as yacht sponsors and Mellon Bank as a consortium member.
Sir Chay said: " Our latest signings bring the number of sponsoring companies involved in the Global Challenge to more than 100.
"We are very proud that the race holds such prestige and is continuing to attract major international blue chip companies. The race continues to build in momentum day by day and these latest signings are testament to this."
Unisys - a worldwide information technology services and solutions company - and EMC - the world leader in products, services, and solutions for information storage and management - are using the sponsorship to showcase their global strategic partnership.
The only female skipper, Dee Caffari will be skippering their yacht, which will be emblazoned with the two companies logos.
Sony will be showcasing its VAIO brand, which can be seen on many of Sony's products. Italian skipper, Amedeo Sorrentino will be taking charge of the VAIO yacht in the race.
Headquartered in Athens, Greece, Stelmar Shipping, which will be sponsoring Clive Cosby's yacht, provides international transportation services to major oil companies, oil traders and state-owned oil companies.
New consortium member, Mellon Bank, which will be aboard Paul Kelly's Team Save the Children, is a US headquartered company, which dates back to 1869. Today it is one of the leading providers of financial services and is divided into two core business groups - asset management and corporate and institutional services.
Barclays, BG Group, SAIC, BP and Carte Blanche Greetings are sponsoring the other Global Challenge yachts.
