Block Thresholds for regular trading hours (RTH) will be modified beginning March 29, 2009, for selected Interest Rate futures and options, and block rules will be standardized where appropriate. Block thresholds during European trading hours (12 a.m. - 7 a.m.) will be half of regular trading hours (7 a.m. – 4 p.m. ) and block thresholds during Asian trading hours (4 p.m. -12 a.m.) will be one quarter of regular trading hours.

For all interest rate products, block trade reporting time requirements will be standardized to 15 minutes during European and Asian hours and five minutes during regular trading hours.

View a summary of the changes
View the Market Regulation Advisory