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"You've got to remember that these companies have been listing against a backdrop of decline in global markets, and indeed the NZX50, so there's a bit of market sentiment that has had an impact," Bennett said.
However, he said companies that had been planning to list in the third and fourth quarters of this year were still pushing ahead with those plans.
"There's probably half a dozen that could list in Q3 and Q4," he said, adding there was a good chance the number could end up being "a bit lower than that".
Bennett wasn't naming potential issuers, but firms tipped to list this year include Auckland-based software developers Orion Health and Wherescape, as well as jetpack developer Martin Aircraft Company.
Mobile technology developer Pushpay is expected to carry out its NZAX compliance listing on Thursday, while transport software firm Eroad will float on Friday and another NZAX compliance listing, Lateral Corporation, is scheduled for next week.
Bennett said geopolitical tensions, such as in Ukraine, or protracted coalition discussions after the September 20 election could cause a blip in the IPO market.
NZX yesterday reported an 8.3 per cent rise in net profit to $7 million for the six months to June 30, while revenue lifted 2.8 per cent to $31.2 million.
Shares in NZX, which declared an interim dividend of 3c a share, closed up 1c at $1.28 yesterday.