He also suggested the IPO was being hampered by the impact of the new financial advisers regime, which he said appeared to limit the ability of brokers to make recommendations to their clients.
The Accident Compensation Corporation was a pre-IPO investor and had subscribed for a significant number of shares under the offer, Ramsay said.
The decision to extend was based on continuing discussions with a potential strategic and several institutional investors.
"We were unable to conclude these discussions before the IPO closure last Friday and the extension will give us time to potentially reach a positive conclusion," he said.
Assuming the issue goes ahead, the company's founders, Chris Mardon and Tom Mackenzie, will own 10.25 million shares each, giving them combined ownership of about half the company.
In the last financial year the company achieved revenue of $8.6 million compared with $5.9 million the previous year, and earnings before interest, tax, depreciation and amortisation of $1.4 million.
Wellington-based firm Woodward Partners is the lead manager for the issue.