David M. Demshur is CEO at CORE LABORATORIES N V (CLB). They have made 14 open-market trades across 1 company since 2007, most recently 2019-12-31.
CIK 0001282547
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 14 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CLB | 385,118 | $3.9M |
Shares reported on the most recent Form 4, priced at the 2020-01-03 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CLB | SELL | 2011-07-25 | 2011-07-27 | $109.26 | $21.9M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2010-07-29 | 2010-07-30 | $76.07 | $7.6M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2010-02-16 | 2010-02-18 | $123.36 | $18.5M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2009-10-29 | 2009-11-02 | $107.49 | $10.7M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2008-02-29 | 2008-03-03 | $122.99 | $1.7M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2008-02-29 | 2008-03-03 | $122.13 | $3.3M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2008-02-28 | 2008-03-03 | $123.71 | $3.2M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2008-02-28 | 2008-03-03 | $124.65 | $4.1M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-08-17 | 2007-08-21 | $102.58 | $2.5M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-08-17 | 2007-08-21 | $103.43 | $1.4M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-08-14 | 2007-08-16 | $104.91 | $3.4M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-02-22 | 2007-02-23 | $80.04 | $4.2M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-02-22 | 2007-02-23 | $79.59 | $2.3M | -13.1% | -1.5% | -1.5% |
| CLB | SELL | 2007-02-22 | 2007-02-23 | $79.32 | $1.4M | -13.1% | -1.5% | -1.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.