Michael E Mikolajczyk insider trades: Rubicon Technology (RBCN) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Michael reports to the SEC
Open-market buys and sales
17 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 19, 2022 | RBCN | ↓ Sell | 31,851 | $20.00 | $637K | Direct | Aug 22, 2022 (3d) |
| Dec 31, 2015 | RBCN | ↑ Buy | 80,000 | $1.20 | $96K | Direct | Jan 4, 2016 (4d) |
| Jun 21, 2010 | RBCN | ↓ Sell | 20,000 | $28.41 | $568K | Direct | Jun 23, 2010 (2d) |
| Jun 2, 2010 | DTPI | ↓ Sell | 20,000 | $10.20 | $204K | Direct | Jun 3, 2010 (1d) |
| Nov 13, 2008 | DTPI | ↑ Buy | 15,000 | $3.94 | $59K | Direct | Nov 14, 2008 (1d) |
| Sep 30, 2008 | DTPI | ↑ Buy | 10,000 | $4.62 | $46K | Direct | Sep 30, 2008 (0d) |
| Sep 23, 2008 | DTPI | ↑ Buy | 20,000 | $5.13 | $103K | Direct | Sep 23, 2008 (0d) |
| Dec 6, 2007 | DTPI | ↑ Buy | 881 | $8.94 | $8K | Direct | Aug 8, 2008 (246d) |
| May 11, 2007 | DTPI | ↓ Sell | 15,000 | $13.00 | $195K | Direct | May 14, 2007 (3d) |
| Apr 24, 2007 | DTPI | ↓ Sell | 41 | $11.27 | $462 | Direct | Aug 8, 2008 (472d) |
| Feb 20, 2007 | DTPI | ↓ Sell | 22,248 | $15.03 | $334K | Direct | Feb 22, 2007 (2d) |
| Feb 6, 2007 | DTPI | ↓ Sell | 15,000 | $14.11 | $212K | Direct | Feb 7, 2007 (1d) |
| Dec 12, 2006 | DTPI | ↓ Sell | 7,500 | $12.01 | $90K | Direct | Dec 14, 2006 (2d) |
| Nov 16, 2006 | DTPI | ↓ Sell | 12,500 | $12.00 | $150K | Direct | Nov 17, 2006 (1d) |
| Nov 7, 2006 | DTPI | ↓ Sell | 5,000 | $10.97 | $55K | Direct | Nov 8, 2006 (1d) |
| Sep 21, 2006 | DTPI | ↓ Sell | 5,000 | $10.00 | $50K | Direct | Sep 25, 2006 (4d) |
| Jun 16, 2005 | DTPI | ↓ Sell | 10,000 | $15.01 | $150K | Direct | Jun 17, 2005 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Michael E Mikolajczyk's insider trades
Michael E Mikolajczyk is a director at Rubicon Technology (RBCN). Since Jun 16, 2005, Michael has reported 5 open-market purchases worth $311K and 12 sales worth $2.6M on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include grants and awards (35 filings), shares returned to the company (5 filings), option exercises (3 filings), shares withheld for taxes (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every RBCN insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.