Facebook Inc. is an American company based in Menlo Park, California. The company owns the social network Facebook, the video and photo sharing app Instagram, the messenger WhatsApp and Oculus VR, the manufacturer of virtual reality hardware.
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