Carolyn J. Turk is Director at MIDDLEFIELD BANC CORP (MBCN). They have made 22 open-market trades across 1 company since 2006, most recently 2026-03-02.
CIK 0001286841
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.
22 open-market purchases totalling $135K since 2006, never a sale. Across 22 scored buys the stock is up 0.8% at ninety days, and 0.1 points ahead of the S&P over the same stretch.
22 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| MBCN | 32,560 | $1.1M |
Shares reported on the most recent Form 4, priced at the 2026-02-25 close.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 91% | 5% | 9% |
| Avg Move | +3.7% | +0.0% | +0.8% |
| Alpha | +7.6% | -0.3% | +0.1% |
| Scored | 22 | 22 | 22 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MBCN | BUY | 2017-03-15 | 2017-03-28 | $41.32 | $5K | -2.7% | +0.2% | +12.4% |
| MBCN | BUY | 2016-05-13 | 2016-05-16 | $33.00 | $33K | -1.6% | +0.0% | +4.3% |
| MBCN | BUY | 2011-12-15 | 2012-01-06 | $17.12 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2011-09-15 | 2011-09-19 | $17.12 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2011-08-10 | 2011-08-15 | $16.00 | $24K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2011-01-31 | 2011-02-02 | $16.00 | $40K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2010-09-15 | 2010-09-20 | $17.61 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2010-03-15 | 2010-03-17 | $23.58 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2009-12-15 | 2009-12-17 | $18.66 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2009-10-30 | 2009-11-03 | $16.25 | $7K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2009-09-15 | 2009-09-17 | $18.38 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2009-06-15 | 2009-06-17 | $20.49 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2008-09-12 | 2008-09-16 | $21.19 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2008-07-18 | 2008-07-21 | $25.00 | $5K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2008-06-13 | 2008-06-17 | $34.72 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2008-03-14 | 2008-03-17 | $36.76 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2007-12-14 | 2007-12-18 | $37.87 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2007-09-15 | 2007-09-25 | $40.33 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2007-06-15 | 2007-06-15 | $39.06 | $3K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2006-09-15 | 2006-09-18 | $43.10 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2006-06-15 | 2006-06-16 | $43.10 | $1K | +4.3% | +0.0% | +0.0% |
| MBCN | BUY | 2006-03-15 | 2006-03-17 | $41.66 | $1K | +4.3% | +0.0% | +0.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.