The CME Group is one of the world's largest options exchanges and the largest futures exchange in the world, based in Chicago in the state of Illinois, the company was formed on July 12, 2007 through the merger of the Chicago Board of Trade and Chicago Mercantile Exchange.
A Failure to deliver also known as fails-to-deliver or FTD occurs when a buyer or seller is unable to meet his trading obligations. FTDs for US listed companies are reported to the SEC and published twice a month. Therefore there is a certain delay between the reporting and the publishing of the data.
Number of shares, 3 months chart