The study of 150 AIM-listed companies, from law firm Faegre & Benson and accountancy Baker Tilly, found that only 41 per cent had an introduction to IR as part of their IPO preparations.
Of the 42 per cent that had no IR instruction before their IPOs, three-quarters said learning about IR and managing comms would have been helpful.
The remainder said they did not know or the question was inapplicable.
However, most of the AIM companies contacted for the survey did not feel IR had an important role to play in pre-flotation, with 79 per cent preferring to manage IR in-house rather than hire an external agency.
'Though it is generally acknowledged that AIM enjoys a very high profile, ignorance about PR and IR can prove to be a serious liability, not only in the pre-flotation stages but more particularly post-flotation,' said Baker Tilly head of capital markets Chilton Taylor.
'Many companies rely on their brokers and financial PR without having an overall IR strategy and underestimate the time executives must give to this important area post-flotation.'