NZX is to receive $US21.4 million by the end of the month after completing the sale of TZ1 Registry, its carbon credit trading platform.
The business was sold to Markit, financial services company in the United States, in 2009, with NZX initially getting Markit shares in a deal valued at about $US37.1 million.
Under the terms of the deal, if TZ1 exceeded certain targets in 2011, NZX would get half of the profits and a top-up payment.
If it didn't, Markit had the option to repurchase its shares for $US21.4 million, which the company has done.