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Fail to Deliver
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Using Firefox, I don't see the charts updating. How do I fix this?
By default, Firefox may not check for newer versions of pages unless they significantly change. Open Firefox and type about:config in the location bar. Find the setting for browser.cache.check_doc_frequency. Right click on this and choose modify from the popup menu. Change the value to 1 and the browser will now check for a new version of the page on every page load. If you do not want a permanent fix for this, you can hit the refresh button after you request a new fails to deliver chart. It will display the new chart image.

How often is this data updated?
This data will be updated as soon as the SEC provides a new update. The last update included 2nd half of Aug 2016 data and was added on 9/15/2016. As of July 2009, the SEC will begin releasing updated data on a two week delay instead of quarterly.

How accurate is this data?
The data is directly from the SEC which states "We cannot guarantee that the data will be posted by a particular date. We cannot guarantee the accuracy of the data." For the purposes of charting, the SEC data was adjusted by this site in the following way: Where the SEC did not track closing prices, they had inserted a "." into the data. These "."s were changed to "1"s.

How did the SEC track this data?
From the SEC: "The values of total fails-to-deliver shares represent the aggregate net balance of shares that failed to be delivered as of a particular settlement date if the balance is 10,000 shares or more. If the aggregate net balance of shares that failed to be delivered is less than 10,000 as of a particular settlement date, then no record will be present in the file for that date even if there are fails in that security. Fails to deliver on a given day are a cumulative number of all fails outstanding until that day, plus new fails that occur that day, less fails that settle that day. The figure is not a daily amount of fails, but a combined figure that includes both new fails on the reporting day as well as existing fails."

What is a Failure to Deliver?
A fail to deliver is recorded when a seller does not provide the shares of stock that were sold within the required 3 day settlement timeframe. From the SEC: "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."

Can I use and republish these charts?
Yes. You may use the chart images in any way you like. However, they are deleted automatically by the server shortly after they are served. You must download them by right clicking on the image and saving it to your machine. From there you can repost the image wherever you like.