First, the amounts are not accumulative, on 8-30 there was a total of 44 shares FTD, which doesn't mean anything. Here's a paragraph from the link that Fourkids posted: Please note that fails-to-deliver can occur for a number of reasons on both long and short sales. Therefore, fails-to-deliver are not necessarily the result of short selling, and are not evidence of abusive short selling or “naked” short selling. For more information on short selling and fails-to-deliver, see http://www.sec.gov/spotlight/keyregshoissues.htm, http://www.sec.gov/divisions/marketreg/mrfaqregsho1204.htm, and http://www.sec.gov/rules/final/34-50103.htm.