Organiser Pat Coutts confirmed more than 350 companies have already committed including 63 first time exhibitors.
Coutts said: "It's the 40th year of Four Oaks and we are on the up and up. We haven't been affected by the new shows at all really. The Cancellation of Garden Expo may well increase numbers for us but we had a look at their list and there didn't seem to be a lot of meat on the bones and a lot of them were going to Glee anyway."
House E will be extended by 30 stands to make room for the extra demand and Coutts said she was confident the show would easily outstrip the 450 companies it attracted in 2009.
The British lorry display introduced by Anderson's last year will return for a second outing and it will be joined by seven Dutch lorries in the outdoor area.
Coutts said the proportion of international exhibitors was holding steady at about 30 per cent and that more hardware and sundry suppliers were helping create a "well balanced show."