So it would stand to reason that should some unexpectedly good news come out, and short sellers did not have 8 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.

Supernus Pharmaceuticals Inc ( SUPN) 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, SUPN has seen 3 different instances of insider buying, as summarized by the table below:

Purchased Insider Title Shares Price/Share Value
03/14/2013 Gregory S. Patrick VP, Chief Financial Officer 5,000 $6.95 $34,737.00
03/21/2013 John M. Siebert Director 3,000 $5.50 $16,499.70
03/22/2013 Michael Bigham Director 35,000 $5.41 $189,270.00

Below is a chart showing the "days to cover" for SUPN over time:

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