Titled 'Exhibition and Event Organisers' this research from Plimsoll also revealed that out of the top 726 companies analysed 475 are worth less than they were last year.
Plimsoll analyst David Pattison said: "It's not surprising that the value of companies have taken a pounding recently, but the extent of the squeeze is striking."
"A number of factors have affected values. As demand slackened and companies were inclined to protect their market share, many saw profitability fall as a result. Declining margins have been the biggest weight on values in the market. The 343 companies that have suffered 30% and more falls in their value have all seen their profit margins plunge too."
However, there is hope for the industry with 249 companies worth more than they were last year. Pattison added: "Considering the malaise in the market over recent years that is a quite remarkable achievement. I hope it points to better times ahead."
In addition to valuing 726 companies in the market, the new analysis will instantly highlight which companies are prospering in the post recession market place, those taking a big gamble and those heading for trouble. It gives an instant performance rating on each company and highlights those ripe for acquisition.
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