John Kenneweg is President & VP at 908 Devices Inc. (MASS). They have made 11 open-market trades across 1 company since 2021, most recently 2026-09-17.
CIK 0001836876
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 11 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MASS | 57,784 | $650K |
Shares reported on the most recent Form 4, priced at the 2026-09-17 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MASS | SELL · 10b5-1 | 2026-09-15 | 2026-09-17 | $10.13 | $280K | +11.3% | — | — |
| MASS | SELL | 2026-05-08 | 2026-05-11 | $8.11 | $148K | -8.3% | +3.4% | +13.4% |
| MASS | SELL | 2026-05-01 | 2026-05-04 | $6.83 | $53K | +8.3% | +29.1% | +26.1% |
| MASS | SELL | 2022-04-12 | 2022-04-14 | $20.07 | $397K | -12.9% | -15.7% | +6.2% |
| MASS | SELL | 2022-03-18 | 2022-03-21 | $20.06 | $798K | +4.2% | +6.2% | -17.3% |
| MASS | SELL · 10b5-1 | 2022-03-11 | 2022-03-15 | $20.00 | $2K | +11.3% | +10.3% | -21.4% |
| MASS | SELL | 2022-01-10 | 2022-01-12 | $20.14 | $201K | -24.5% | -21.8% | +1.6% |
| MASS | SELL | 2021-11-16 | 2021-11-18 | $30.30 | $591K | -10.2% | -4.4% | -43.0% |
| MASS | SELL | 2021-10-18 | 2021-10-19 | $32.22 | $322K | -2.4% | -19.9% | -50.1% |
| MASS | SELL | 2021-09-16 | 2021-09-17 | $36.61 | $366K | -7.0% | -6.1% | -30.7% |
| MASS | SELL | 2021-08-16 | 2021-08-17 | $30.45 | $609K | +17.6% | +23.4% | +3.1% |
| MASS | SELL | 2021-07-16 | 2021-07-20 | $32.24 | $621K | -2.3% | -3.2% | +1.4% |
| MASS | SELL | 2021-06-16 | 2021-06-21 | $39.27 | $785K | -4.9% | -13.6% | -9.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.