Gilbertson, whose company publishes titles including Draper's Record, Retail Week and Broadcast, said that there had been misunderstandings about the financial state of his company after an annual equity evaluation valued the company at zero.
"It's true that we have no equity value above what we were valued at, but we are still worth around $1bn (£0.6m) and Apax will be continuing its investment," he told Event.
"This announcement has no effect on our business, it is just a technical accounting procedure. Emap grew in profitability last year and we continue to invest in our exhibition portfolio, which is resilient and has a strong portfolio of 19 shows."
Emap's portfolio of events includes The Education Show, the Recycling and Waste Management Exhibition and BETT.
In January this year, Emap reported that 2008's , marking the show's fifth year-on-year increase.
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