Kevin J. Knopp is CEO & President at 908 Devices Inc. (MASS). They have made 25 open-market trades across 1 company since 2021, most recently 2026-08-17.
CIK 0001836523
7 open-market purchases totalling $547K since 2024, against 18 sales. Across 7 scored buys the stock is down 6.6% at ninety days, and 9.8 points behind the S&P over the same stretch.
7 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| MASS | 555,968 | $6.3M |
Shares reported on the most recent Form 4, priced at the 2026-08-17 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 86% | 86% | 29% |
| Avg Move | +15.3% | +22.0% | -6.6% |
| Alpha | +13.9% | +19.3% | -9.8% |
| Scored | 7 | 7 | 7 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MASS | SELL · 10b5-1 | 2026-08-13 | 2026-08-17 | $10.27 | $284K | +10.4% | -1.2% | — |
| MASS | SELL · 10b5-1 | 2026-08-10 | 2026-08-12 | $9.90 | $1.5M | +9.3% | -4.6% | — |
| MASS | SELL · 10b5-1 | 2026-07-02 | 2026-07-07 | $9.07 | $2K | -6.0% | +6.1% | +63.5% |
| MASS | SELL · 10b5-1 | 2026-06-26 | 2026-06-30 | $9.09 | $25K | -10.6% | -14.1% | +31.1% |
| MASS | SELL · 10b5-1 | 2026-06-23 | 2026-06-25 | $9.12 | $551K | -11.5% | -20.0% | +22.8% |
| MASS | SELL | 2026-02-02 | 2026-02-03 | $6.18 | $215K | +1.2% | +5.3% | +2.0% |
| MASS | BUY | 2025-05-15 | 2025-05-19 | $4.44 | $67K | +19.3% | +67.4% | +31.7% |
| MASS | BUY | 2025-05-14 | 2025-05-14 | $4.32 | $130K | +22.2% | +64.3% | +45.4% |
| MASS | SELL | 2025-02-03 | 2025-02-04 | $2.32 | $37K | +18.3% | +28.1% | +129.8% |
| MASS | BUY | 2024-05-13 | 2024-05-13 | $6.42 | $64K | -2.1% | -8.6% | -36.7% |
| MASS | BUY | 2024-05-10 | 2024-05-10 | $5.77 | $115K | +16.5% | +6.9% | -23.9% |
| MASS | BUY | 2024-05-09 | 2024-05-09 | $5.83 | $58K | +11.7% | +7.1% | -24.1% |
| MASS | BUY | 2024-05-08 | 2024-05-08 | $5.72 | $57K | +18.9% | +7.1% | -19.6% |
| MASS | BUY | 2024-05-07 | 2024-05-07 | $5.60 | $56K | +20.4% | +9.8% | -18.6% |
| MASS | SELL | 2024-02-01 | 2024-02-02 | $7.00 | $63K | +6.2% | +3.6% | -18.8% |
| MASS | SELL · 10b5-1 | 2023-05-23 | 2023-05-25 | $10.12 | $607K | -0.4% | -27.9% | -21.6% |
| MASS | SELL | 2023-02-15 | 2023-02-17 | $10.27 | $361K | -9.9% | -36.0% | -23.0% |
| MASS | SELL | 2023-02-01 | 2023-02-03 | $10.40 | $458K | +1.1% | -11.9% | -30.9% |
| MASS | SELL | 2022-11-15 | 2022-11-17 | $11.00 | $429K | -0.5% | -23.6% | -4.3% |
| MASS | SELL | 2022-10-17 | 2022-10-19 | $15.08 | $452K | +3.8% | -35.8% | -37.6% |
| MASS | SELL | 2022-09-15 | 2022-09-19 | $16.94 | $1.0M | -4.7% | -6.7% | -50.6% |
| MASS | SELL | 2022-08-15 | 2022-08-17 | $19.25 | $1.1M | +12.7% | -5.0% | -40.6% |
| MASS | SELL | 2022-08-05 | 2022-08-09 | $25.32 | $1.3M | -1.2% | +1.5% | -26.8% |
| MASS | SELL | 2022-07-28 | 2022-08-01 | $22.30 | $1.3M | -11.4% | -9.4% | -28.1% |
| MASS | SELL · 10b5-1 | 2022-07-21 | 2022-07-25 | $22.04 | $4K | +17.6% | -2.5% | -24.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.