Dsm N.v. Royal is 10% at MARTEK BIOSCIENCES CORP (MATK). They have made 3 open-market trades across 2 companies since 2011, most recently 2012-06-22.
CIK 0001339422
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.
3 open-market purchases totalling $809.4M since 2011, never a sale. 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.