Mark F. Lamps is President at Atkore International Group Inc. (ATKR). They have made 7 open-market trades across 1 company since 2019, most recently 2026-08-28.
CIK 0001769052
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 7 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ATKR | 35,849 | $3.4M |
Shares reported on the most recent Form 4, priced at the 2026-08-31 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ATKR | SELL · 10b5-1 | 2026-08-10 | 2026-08-10 | $93.75 | $28K | -0.3% | +0.3% | — |
| ATKR | SELL · 10b5-1 | 2026-02-17 | 2026-02-17 | $65.78 | $66K | -3.0% | -14.9% | +11.8% |
| ATKR | SELL · 10b5-1 | 2025-11-17 | 2025-11-17 | $64.75 | $65K | +4.5% | -0.5% | +3.7% |
| ATKR | SELL · 10b5-1 | 2025-08-15 | 2025-08-18 | $59.37 | $59K | +1.2% | +3.3% | +11.7% |
| ATKR | SELL · 10b5-1 | 2025-05-09 | 2025-05-09 | $69.16 | $69K | -8.4% | -3.0% | -23.3% |
| ATKR | SELL · 10b5-1 | 2025-02-10 | 2025-02-10 | $65.00 | $33K | -4.5% | -7.5% | +2.0% |
| ATKR | SELL · 10b5-1 | 2024-11-11 | 2024-11-13 | $96.55 | $48K | +1.9% | -8.7% | -23.3% |
| ATKR | SELL · 10b5-1 | 2024-08-12 | 2024-08-12 | $95.47 | $48K | +3.0% | -12.4% | +1.3% |
| ATKR | SELL · 10b5-1 | 2024-05-14 | 2024-05-14 | $157.67 | $79K | -1.0% | -9.6% | -40.0% |
| ATKR | SELL · 10b5-1 | 2023-11-22 | 2023-11-22 | $130.66 | $1.3M | -0.3% | +23.8% | +9.2% |
| ATKR | SELL · 10b5-1 | 2023-11-20 | 2023-11-20 | $131.51 | $18K | +2.9% | +22.0% | +10.4% |
| ATKR | SELL | 2023-02-03 | 2023-02-07 | $144.75 | $359K | +1.3% | +1.0% | -11.7% |
| ATKR | SELL | 2022-11-22 | 2022-11-23 | $118.91 | $786K | +4.5% | -3.6% | +19.3% |
| ATKR | SELL | 2022-05-06 | 2022-05-06 | $113.64 | $192K | -7.5% | +9.3% | -19.9% |
| ATKR | SELL | 2022-03-04 | 2022-03-07 | $102.95 | $131K | +13.3% | -4.3% | +30.0% |
| ATKR | SELL · 10b5-1 | 2021-11-30 | 2021-11-30 | $108.12 | $35K | +0.3% | -0.3% | -7.5% |
| ATKR | SELL · 10b5-1 | 2021-11-23 | 2021-11-26 | $112.95 | $35K | +2.8% | +3.4% | -4.4% |
| ATKR | SELL · 10b5-1 | 2021-03-02 | 2021-03-03 | $69.32 | $44K | +7.8% | +7.3% | +15.7% |
| ATKR | SELL · 10b5-1 | 2021-01-04 | 2021-01-06 | $42.70 | $14K | +3.9% | +22.4% | +51.7% |
| ATKR | SELL | 2020-11-27 | 2020-11-30 | $39.45 | $166K | +11.2% | +3.9% | +76.4% |
| ATKR | SELL · 10b5-1 | 2020-03-05 | 2020-03-06 | $37.23 | $25K | -65.6% | -39.1% | -16.7% |
| ATKR | SELL · 10b5-1 | 2019-12-05 | 2019-12-10 | $41.57 | $16K | -3.3% | -2.7% | -17.2% |
| ATKR | SELL | 2019-11-27 | 2019-11-29 | $41.75 | $168K | -0.3% | -2.8% | -12.4% |
| ATKR | SELL | 2019-11-07 | 2019-11-07 | $37.51 | $150K | +0.1% | +12.3% | +12.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.