Mark A. Alexander is Director at Builders FirstSource, Inc. (BLDR). They have made 11 open-market trades across 2 companies since 2007, most recently 2026-06-01.
CIK 0001212607
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.
11 open-market purchases totalling $2.0M since 2007, never a sale. Across 8 scored buys the stock is up 6.3% at ninety days, and 1.2 points behind the S&P over the same stretch.
8 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 75% | 75% | 38% |
| Avg Move | +4.9% | +8.4% | +6.3% |
| Alpha | +2.5% | +3.3% | -1.2% |
| Scored | 8 | 8 | 8 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| WPC | BUY | 2024-11-01 | 2024-11-05 | $55.29 | $276K | -0.6% | -0.4% | -1.2% |
| WPC | BUY | 2024-08-16 | 2024-08-20 | $57.03 | $114K | +2.2% | +7.4% | -4.3% |
| WPC | BUY | 2024-08-09 | 2024-08-12 | $55.87 | $196K | +4.0% | +10.0% | -1.3% |
| WPC | BUY | 2023-05-02 | 2023-05-03 | $72.48 | $72K | -0.6% | -1.4% | -6.4% |
| WPC | BUY | 2020-05-19 | 2020-05-21 | $58.78 | $235K | +7.2% | +10.6% | +11.7% |
| WPC | BUY | 2020-03-17 | 2020-03-19 | $60.79 | $243K | +23.5% | +28.5% | +55.7% |
| WPC | BUY | 2019-12-11 | 2019-12-13 | $80.50 | $185K | +1.9% | +7.1% | -13.0% |
| WPC | BUY | 2016-11-17 | 2016-11-17 | $57.73 | $231K | +1.5% | +5.2% | +9.6% |
| KDN | BUY | 2012-05-14 | 2012-05-15 | $23.22 | $232K | N/A | N/A | N/A |
| KDN | BUY | 2009-12-16 | 2009-12-18 | $35.97 | $144K | N/A | N/A | N/A |
| KDN | BUY | 2007-11-02 | 2007-11-06 | $52.03 | $52K | 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.