Calls lock it the price where investors can buy stock, so they can make huge moves on a percentage basis from a modest gain in the underlying share price. But these options will expire worthless if the stock doesn't go in the right direction quickly enough.
Harley-Davidson shares rose 2.06 percent to close at $47.62 yesterday. It's been trapped below $48 since late June, so yesterday's call buyers are looking for that resistance to give way by expiration at the end of next week.
Total option volume was almost 10 times greater than average in the session. Calls outnumbered puts by a bullish 37-to-1 ratio.
—Written by CNBC Contributor David Russell
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David Russell is a reporter and writer for OptionMonster. Russell has no positions in HOG.