Regulators will have difficulty obtaining a “single snapshot of risk” in the vast over-the-counter derivatives markets unless such markets are required to use a single database that has recorded all trades done, the head of the largest markets post-trade group warned on Tuesday.

The comments, by Don Donahue, chairman and chief executive of The Depository Trust & Clearing Corporation, are a sign of DTCC’s concern that a proliferation of clearing initiatives in the US and Europe could lead to fragmentation of important data about OTC derivatives.