Michael Graff is Director at Builders FirstSource, Inc. (BLDR). They have made 48 open-market trades across 3 companies since 2006, most recently 2026-09-18.
CIK 0001299926
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.
20 open-market purchases totalling $5.5M since 2006, against 28 sales. Across 20 scored buys the stock is up 3.2% at ninety days, and 2.3 points ahead of the S&P over the same stretch.
20 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 5% | 95% | 100% |
| Avg Move | -20.1% | +2.2% | +3.2% |
| Alpha | -14.7% | +1.6% | +2.3% |
| Scored | 20 | 20 | 20 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TDG | SELL | 2025-08-26 | 2025-08-27 | $1401.86 | $3.3M | -6.1% | -7.2% | -3.2% |
| TDG | SELL | 2024-02-13 | 2024-02-13 | $1108.15 | $7.6M | +4.6% | +4.4% | +12.8% |
| TDG | BUY | 2020-06-12 | 2020-06-12 | $448.07 | $554K | +2.4% | -2.2% | +17.8% |
| TDG | SELL | 2019-02-08 | 2019-02-12 | $424.36 | $154K | +0.8% | +2.3% | +7.3% |
| TDG | SELL | 2019-02-08 | 2019-02-11 | $424.36 | $2.2M | +1.1% | +1.8% | +7.4% |
| TDG | SELL | 2019-02-08 | 2019-02-11 | $424.36 | $1.1M | +1.1% | +1.8% | +7.4% |
| TDG | SELL | 2017-12-01 | 2017-12-04 | $279.04 | $623K | -0.5% | -2.0% | +3.5% |
| TDG | SELL | 2016-11-21 | 2016-11-22 | $251.33 | $2.0M | -2.2% | -1.6% | +0.7% |
| BLDR | SELL | 2016-05-24 | 2016-05-25 | $10.40 | $275.9M | +1.9% | -8.2% | +9.9% |
| BLDR | SELL | 2015-11-25 | 2015-11-25 | $13.05 | $91.3M | -21.3% | +2.4% | -33.5% |
| BLDR | SELL | 2015-07-31 | 2015-08-03 | $12.22 | $56.2M | -21.3% | +2.4% | +2.4% |
| TDG | SELL | 2014-11-17 | 2014-11-18 | $192.54 | $4.1M | -3.1% | +0.7% | +0.7% |
| BLDR | BUY | 2012-06-07 | 2012-06-11 | $3.71 | $30K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-06-04 | 2012-06-06 | $3.54 | $146K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-05-30 | 2012-06-01 | $3.95 | $19K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-05-24 | 2012-05-29 | $3.97 | $127K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-05-21 | 2012-05-23 | $3.72 | $211K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-05-16 | 2012-05-18 | $4.02 | $187K | -21.3% | +2.4% | +2.4% |
| TDG | SELL | 2012-05-10 | 2012-05-11 | $126.48 | $2.5M | -3.1% | +0.7% | +0.7% |
| BLDR | BUY | 2012-05-07 | 2012-05-09 | $3.93 | $235K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-03-07 | 2012-03-09 | $3.14 | $71K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-03-02 | 2012-03-06 | $3.12 | $136K | -21.3% | +2.4% | +2.4% |
| BLDR | BUY | 2012-02-28 | 2012-03-01 | $3.11 | $311K | -21.3% | +2.4% | +2.4% |
| TDG | SELL | 2012-02-09 | 2012-02-10 | $116.39 | $1.4M | -3.1% | +0.7% | +0.7% |
| TDG | SELL | 2011-09-07 | 2011-09-08 | $90.69 | $1.8M | -3.1% | +0.7% | +0.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.