Carl S. Turza is CIO at SIGMA ALDRICH CORP (SIAL). They have made 4 open-market trades across 1 company since 2007, most recently 2010-02-17.
CIK 0001361432
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
2 open-market purchases totalling $114K since 2007, against 2 sales. Too few scored purchases to measure a record yet.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.