Gerrit van den Dool is VP & Director +1 at SIGMA ALDRICH CORP (SIAL). They have made 2 open-market trades across 1 company since 2009, most recently 2011-02-18.
CIK 0001201803
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.
0 open-market purchases, 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.