Fairfax said in August that it intended to sell between 30 per cent and 35 per cent of Trade Me via an initial public offering.
Fund managers have seen pre-float document suggesting a valuation of more than $1 billion for the whole business.
The top end of the valuation range for the float is around 16 times projected net profit for 2012. Some fund manager regard this as expensive, while others say it is in the ballpark for a digital business.
The process of the float is being managed around the New Zealand election on November 26 and there is a desire to get the float away before the summer holidays.
Fairfax acquired Trade Me for $750 million in 2006. Founder Sam Morgan is on the Fairfax Media board and former All Blacks captain David Kirk, a former Fairfax chief executive, is set to chair the demerged company.
Trade Me Holdings Ltd and Fairfax Digital Assets NZ Ltd and Fairfax Digital Holdings NZ Ltd have been reserved as names at the Companies Office.
Shares in Fairfax haven't been halted for the bookbuild, and last traded at 94 Australian cents on the ASX. The stock has shed almost a third of its value this year, valuing it at A$2.21 billion by market capitalisation, and is rated an average 'outperform' by 13 analysts, according to Reuters.