The 612 exhibiting brands come from 66 different countries and occupy 38 of Excel London’s 44 halls.
Last year, 589 exhibitors from 65 nations required 36 of the venue’s halls.
Kate Chambers, Managing Director of Clarion Gaming, said: "The starting point for any exhibition is its exhibitors: great exhibitors attract serious buyers and the more buyers you can attract, the more exhibitors are interested in your event and so the process goes on.
"With this in mind, we have worked extremely hard to attract the most innovative organisations in world gaming onto the ICE London show floor and I am delighted we have succeeded in breaking through the 600 figure, in light of what that means for our huge community of visitors who travel to ICE London to be inspired."
The overall conference floor space has increased from 43,500m2 to 45,000m2, following a trend of growth which began in 2012.
This year, ICE London is twice its 2012 size and runs from 5 to 7 February.