A. Mark Zeffiro is President & VP at TRIMAS CORP (TRS). They have made 19 open-market trades across 3 companies since 2008, most recently 2026-08-28.
CIK 0001446066
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.
7 open-market purchases totalling $226K since 2008, against 12 sales. Across 7 scored buys the stock is up 0.3% at ninety days, and 0.4 points behind the S&P over the same stretch.
7 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 0% | 0% | 14% |
| Avg Move | -4.2% | -2.1% | +0.3% |
| Alpha | +1.0% | -2.1% | -0.4% |
| Scored | 7 | 7 | 7 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ATKR | SELL | 2024-05-22 | 2024-05-22 | $154.11 | $308K | -10.0% | -14.1% | -38.9% |
| ATKR | SELL | 2023-05-24 | 2023-05-24 | $118.82 | $89K | +11.0% | +21.4% | +19.9% |
| ATKR | SELL | 2021-05-11 | 2021-05-12 | $85.69 | $857K | -4.2% | -7.4% | +14.0% |
| HZN | SELL | 2017-09-18 | 2017-09-20 | $16.38 | $885K | +8.9% | +2.7% | -14.4% |
| HZN | BUY | 2017-03-14 | 2017-03-16 | $13.57 | $147K | -6.3% | -7.5% | +9.0% |
| TRS | SELL | 2014-04-30 | 2014-05-02 | $35.05 | $456K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2013-10-31 | 2013-11-04 | $37.92 | $306K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2013-10-29 | 2013-10-31 | $40.27 | $709K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2013-03-08 | 2013-03-12 | $29.01 | $290K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2012-03-09 | 2012-03-13 | $23.15 | $742K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2011-05-27 | 2011-05-31 | $20.95 | $292K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2011-05-10 | 2011-05-12 | $22.40 | $339K | -3.8% | -1.2% | -1.2% |
| TRS | SELL | 2011-03-01 | 2011-03-03 | $19.87 | $725K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2010-05-20 | 2010-05-24 | $9.21 | $2K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2010-05-07 | 2010-05-11 | $9.82 | $15K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2010-03-04 | 2010-03-10 | $6.52 | $26K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2009-03-11 | 2009-03-13 | $1.52 | $11K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2008-11-13 | 2008-11-14 | $1.28 | $15K | -3.8% | -1.2% | -1.2% |
| TRS | BUY | 2008-11-11 | 2008-11-13 | $2.17 | $10K | -3.8% | -1.2% | -1.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.