The most recent short interest data was recently released by the NASDAQ for the 09/15/2014 settlement date, and ARIAD Pharmaceuticals, Inc. (ARIA is one of the most shorted stocks of the Russell 3000, based on 10.65 "days to cover" versus the median component at 6.91. There are a number of ways to look at short data, but one metric that we find particularly useful is the "days to cover" because it considers both the total shares short and the average daily volume of shares typically traded. The number of shares short is then divided by the average daily volume, to express the total number of trading days it would take to close out all of the open short positions if every share traded represented a short position being closed.In the case of ARIAD Pharmaceuticals, Inc. ( ARIA, the total short interest at the 09/15/2014 settlement date was 51,501,732 shares, which compares to the average daily trading volume of just 4,833,673 shares, for a "days to cover" ratio of 10.65. When short sellers eventually cover their positions, by definition there must be buying activity because a share that is currently sold short must be purchased to be covered. At the present levels of short interest, if from this point forward every single ARIA share traded represented a short position being closed, then at the average daily volume of 4,833,673 shares it would only be during the 11th trading day that every short position would be closed.
So it would stand to reason that should some unexpectedly good news come out, and short sellers did not have 11 days of patience but instead wanted to cover their short positions very suddenly, that situation could result in sending the stock higher until the higher price produces enough sellers to generate the necessary volume to close out those positions quickly.ARIAD Pharmaceuticals, Inc. ( ARIA has something relatively rare for a stock with this much short interest, that being insiders taking the other side of the trade. Looking back over the trailing six month period, ARIA has seen 3 different instances of insider buying, as summarized by the table below:
|08/15/2014||Alexander J. Denner||Director||850,000||$5.83||$4,955,500.00|
|09/10/2014||Sarah J. Schlesinger||Director||5,200||$5.73||$29,783.00|
|09/03/2014||Harvey J. M. D. Berger||Chairman & CEO||25,000||$6.27||$156,636.25|
And looking at the chart below, ARIA's low point in its 52 week range is $2.15 per share, with $19.89 as the 52 week high point — that compares with a last trade of $5.53. In recent trading, shares of ARIAD Pharmaceuticals, Inc. ( ARIA were changing hands at $5.53/share.