CME Clearing reported a peak margin breach of $138 million in the fourth quarter of 2018 – the largest since public disclosures began in 2015. Prior to this, the central counterparty's largest margin breach was$47 million in size, incurred in the first quarter of last year.

The clearing house posted a total of seven initial margin breaches in the fourth quarter, with an average size of \$53 million each – the highest average size on public record. In 2018 as a whole, 19 margin breaches were