Risk.net Dealers say proposal to force disclosure of all big-bank OTC derivatives trades won’t improve data Need to know Post-trade data published in the European Union is patchy and hard to use for a variety of reasons. One reason is a lack of clarity over when off-venue derivatives trades must be disclosed. Esma’s proposed solution is to require dealers that trade large amounts of a derivative outside of a venue to publish details of all transactions in swaps belonging to the same sub-asset class. Dealers say this approach will simply increase the quantity of trade data without improving its quality. It could also make it harder to decipher aggregate data and raise the risk of pre-emptive trades that would damage less sophisticated market players.