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Dyax attracts large bullish position

Mike Yamamoto (mike.yamamoto@optionmonster.com)

Dyax rarely sees much option activity, but yesterday one trader made a large bet that the biopharmaceutical firm will rally hard by next spring.

optionMONSTER's Heat Seeker system detected the purchase of 5,000 May 10 calls in less than 2 minutes, led by a single print of 4,728 that went for $0.55. This is a new position, as there was no open interest in the strike before the trade appeared.

These long calls lock in the price where traders can buy the stock for the next eight months no matter how far it might rise. They could be sold earlier at a profit if premiums rise with a rally before then, but the contracts will expire worthless if shares remain below $10 through mid-May 2014. (See our Education section)

DYAX finished yesterday unchanged at $6.06. The drug developer broke out of an extremely tight range in late August and has been climbing ever since.

Leerink Swann raised its price target on Dyax to $7 from $5 last week. The company, a favorite among some hedge funds, focuses on the treatment of inflammatory diseases.

Yesterday's call buying made up almost all of the option volume in DYAX, which was 73 times its daily average for the last month. Overall calls outnumbered puts by a bullish 21-to-1 ratio.

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