David Bock files SEC Form 4 disclosures for PIONEER MUNICIPAL HIGH INCOME ADVANTAGE TRUST. They have made 4 open-market trades across 3 companies since 2008, most recently 2011-03-17.
CIK 0001251972
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 $84K since 2008, 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.