Michael E. Mikolajczyk is Director at Rubicon Technology, Inc. (RBCN). They have made 8 open-market trades across 2 companies since 2006, most recently 2022-08-19.
CIK 0001224360
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.
5 open-market purchases totalling $311K since 2006, against 3 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| RBCN | SELL | 2022-08-19 | 2022-08-22 | $20.00 | $637K | -77.6% | -81.2% | -87.0% |
| RBCN | BUY | 2015-12-30 | 2016-01-04 | $1.20 | $96K | +27.5% | +15.8% | +15.8% |
| RBCN | SELL | 2010-06-21 | 2010-06-23 | $28.41 | $568K | +27.5% | +15.8% | +15.8% |
| DTPI | SELL · 10b5-1 | 2010-06-02 | 2010-06-03 | $10.20 | $204K | N/A | N/A | N/A |
| DTPI | BUY | 2008-11-13 | 2008-11-14 | $3.95 | $59K | N/A | N/A | N/A |
| DTPI | BUY | 2008-09-30 | 2008-09-30 | $4.62 | $46K | N/A | N/A | N/A |
| DTPI | BUY | 2008-09-23 | 2008-09-23 | $5.13 | $103K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2007-05-11 | 2007-05-14 | $13.00 | $195K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2007-02-20 | 2007-02-22 | $15.03 | $334K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2007-02-06 | 2007-02-07 | $14.11 | $212K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2006-12-12 | 2006-12-14 | $12.01 | $90K | N/A | N/A | N/A |
| DTPI | BUY | 2006-12-08 | 2008-08-08 | $8.94 | $8K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2006-11-15 | 2006-11-17 | $12.00 | $150K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2006-11-07 | 2006-11-08 | $10.97 | $55K | N/A | N/A | N/A |
| DTPI | SELL · 10b5-1 | 2006-09-21 | 2006-09-25 | $10.00 | $50K | N/A | N/A | N/A |
| DTPI | SELL | 2006-09-15 | 2008-08-08 | $11.27 | $462 | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.