Co. Investment 2000 FUND L.P. is 10% at Rubicon Technology, Inc. (RBCN). They have made 3 open-market trades across 2 companies since 2013, most recently 2017-04-10.
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 3 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.