Calls for European politicians to tighten up new rules to limit the fees stock exchanges charge for their data have grown louder, with the Dutch and German asset management trade bodies joining their UK and Brussels-based counterparts in coming out against the proposals as tabled.

Hans Janssen Daalen, director general of the Dutch Fund and Asset Management Association, or Dufas, wrote to prominent MEPs including the UK's Kay Swinburne and Germany's Markus Ferber on June 17, asking them to reject market data provisions included in a revised version of the EU's Markets in Financial Instruments Directive, or Mifid II.