Short Interest

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Short Quote™

Symbol:

Prothena Corporation Plc Ord WI $ 13.14
PRTA (NASDAQ) 0.13
Short Squeeze Ranking™ view
Daily Short Sale Volume view
Short Interest (Shares Short) 8,780,000
Short Interest Ratio (Days To Cover) 17.9
Short Percent of Float 20.66 %
Short % Increase / Decrease -4 %
Short Interest (Shares Short) - Prior 9,130,000
Shares Float 42,500,000
Trading Volume - Today 211,935
Trading Volume - Average 490,000
Trading Volume - Today vs. Average 43.25%
% Owned by Insiders 12.42%
% Owned by Institutions
Earnings Per Share
PE Ratio
Market Cap. $ 0
% From 52-Wk High -48.61%
% From 52-Wk Low 12.31%
% From 200-Day MA -26.59%
% From 50-Day MA -7.67%
Sector Healthcare
Industry Biotechnology
Exchange NAS
Record Date 2025-MarB

In The News

“The possibility of a short squeeze is one reason some analysts look at a high amount of short interest as a bullish indicator. Short Interest is the fuel, performance is the fuse, says ShortSqueeze.com”
- USA Today

...short sellers, not financial results, are driving up Air T's share price. More than half the shares were sold short last month, according to ShortSqueeze.com”
- Reuters

“...according to ShortSqueeze.com. Any encouraging news from Martha Stewart Living could lead to a wave of short sellers trying to buy stock and limit their losses, pushing the price higher. ”
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