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Short interest in NEOP starts at 6.5 million in mid-Feb, but hedge funds started shorting a month before that

Neoprobe was just uplisted to Amex and so there's only two short interest data points (both roughly 6.5 million shares short interest out of 69 million float).

However, investors have been shorting NEOP for a few years now.  Of course as recently as September 2010, there were only 11,900 shares being borrowed and shorted in the market according to SunGard's Short Side database.  Hedge funds really started to ramp up shorting activity on January 11, 2011 as you can see in the chart below.

There are only 3 institutions that currently hold shares of NEOP, and they only hold a total of 150,000 shares.  Insiders own 13% of shares oustanding, which is 69 million shares.

Should an institutional investor purchase a significant percentage of float and prevent their shares from being lent (to facilitate short sales), current short sellers could face a buy-in as NEOP is already one of the most expensive stocks to borrow and short right now.