So it would stand to reason that should some unexpectedly good news come out, and short sellers did not have 15 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.

Idexx Laboratories, Inc. ( IDXX) 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, IDXX has seen 2 different instances of insider buying, as summarized by the table below:

Purchased Insider Title Shares Price/Share Value
11/04/2013 M. Anne Szostak Director 1,000 $108.24 $108,240.00
11/22/2013 Sophie V. Vandebroek Director 1,000 $107.84 $107,840.00

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

And looking at the chart below, IDXX's low point in its 52 week range is $81.57 per share, with $113.11 as the 52 week high point — that compares with a last trade of $105.92.

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