The NYSE plans to change the way it reports trade details , offering more transparent data , but only to those paying a premium for it . The index forms part of the data set used by investors to determine which of the 11 US traded exchanges are most likely to give the best percentage of orders getting filled . IEX Buy - backed consortium and US trading partner , IEX Group , has criticised the move , referring to the situation as ' a fundamental issue about fairness and transparency ' .
The NYSE plans to change the way it reports trade details, giving more transparent data, but only to those paying a premium for it. The data forms part of the data set used by investors to determine which of the 11 US stock exchanges are most likely to give the best chance of orders getting filled. IEX Buy-side consortium owned US trading venue, IEX Group, has criticised the move, referring to the situation as 'a fundamental issue about fairness and transparency'.