Sigma-Aldrich has risen more than 45 percent since its March lows, and some options traders apparently believe that the biochemical company has even more upside potential.
The average daily total for all Sigma-Aldrich options is 210 contracts, but calls alone totaled 4,474 yesterday versus just 58 puts, according to OptionMonster's proprietary monitoring program.
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Trading was focused on the June 50 options, where more than 3,300 calls went for $0.30 to $0.55, dwarfing open interest of just 20 contracts. Normally just one call trades at that strike on average each day.