Joe Porwoll, Insider at SIGMA ALDRICH CORP (SIAL), sold 4,100 shares at $66.00 ($271K) on 2010-11-04, disclosed to the SEC on 2010-12-17.
Open-market sale of $271k SIAL by Insider. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.
Nothing distinguishes this filing.