Traders See Upside to Sigma-Aldrich

By Pete Najarian, co-founder of OptionMonster

Sigma-Aldrich (SIAL Quote) has risen more than 45% 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 Tuesday vs. just 58 puts, according to OptionMonster's proprietary monitoring program.

Trading was focused on the June 50 options, in which more than 3,300 calls went for 30 cents to 55 cents, dwarfing open interest of just 20 contracts. Normally just one call trades at that strike on average each day. ...