OTC Clearing posted strong growth in September, with notional outstanding volumes up 37 percent year-on-year to EUR 46,699 billion, compared with EUR 34,115 billion in the same month of 2024. The surge was driven largely by overnight index swaps, which leapt 52 percent to EUR 6,084 billion. Interest rate swaps also contributed significantly, rising 29 percent to EUR 19,814 billion.