Editor's note: In this feature from Stockpickr, we highlight lists of stocks that have made new highs, lows or seen other unusual activity.

Dendreon's ( DNDN) 64% plunge, after the Food and Drug Administration said it needed more information about the company's prostate cancer treatment, Provenge, made the biotech company Stockpickr's Biggest % Loser.

Shares of Emageon ( EMAG) tumbled 27% to a 52-Week Low, after it slashed its full-year guidance following a disappointing first quarter.

Foster Wheeler ( FWLT) headed the Biggest % Gainers, after the engineering services company posted earnings results that easily beat Wall Street's forecast.

Talk of a possible takeover by rival miner BHP Billiton ( BHP) drove shares of London-based Rio Tinto ( RTP) to the top of Stockpickr's 52-Week Highs list.

Arrow International ( ARRO), which makes catheters and other critical and cardiac care products, headed the Rising on Unusual Volume list, after acknowledging it was considering strategic alternatives, including a possible sale.

Finally, National Semiconductor ( NSM) topped the list of Latest Activist Situations, after Relational Investors disclosed it had upped its stake in the company.


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