The National Securities Clearing Corporation (NSCC), a division of the Depository Trust & Clearing Corporation (DTCC), has reported its largest margin breach since public reporting began: a shortfall of $137 million in the second quarter of this year. This helped to push the average size of margin breaches over the quarter to$8 million, also the highest since disclosures were first issued in the third quarter of 2015. The total number of breaches incurred in the 12 months to end-June was 143.