Christopher D. Brown is CTO at 908 Devices Inc. (MASS). They have made 16 open-market trades across 1 company since 2021, most recently 2026-10-07.
CIK 0001836988
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 16 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MASS | 805,559 | $9.1M |
Shares reported on the most recent Form 4, priced at the 2026-10-09 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MASS | SELL · 10b5-1 | 2026-10-07 | 2026-10-09 | $11.89 | $357K | — | — | — |
| MASS | SELL · 10b5-1 | 2026-09-02 | 2026-09-04 | $10.58 | $317K | +12.2% | +30.6% | — |
| MASS | SELL · 10b5-1 | 2026-08-10 | 2026-08-12 | $9.12 | $162K | +9.3% | -4.6% | — |
| MASS | SELL · 10b5-1 | 2026-08-05 | 2026-08-07 | $8.49 | $170K | +15.8% | +10.9% | — |
| MASS | SELL · 10b5-1 | 2026-07-02 | 2026-07-07 | $9.02 | $20K | -6.0% | +6.1% | +63.5% |
| MASS | SELL · 10b5-1 | 2026-06-30 | 2026-07-02 | $8.84 | $177K | -7.5% | -2.6% | +41.9% |
| MASS | SELL · 10b5-1 | 2026-06-23 | 2026-06-25 | $9.04 | $89K | -11.5% | -20.0% | +22.8% |
| MASS | SELL · 10b5-1 | 2026-06-04 | 2026-06-05 | $9.00 | $900 | +5.5% | +3.6% | +23.7% |
| MASS | SELL · 10b5-1 | 2026-06-03 | 2026-06-04 | $8.73 | $175K | +1.3% | -1.3% | +21.0% |
| MASS | SELL · 10b5-1 | 2026-05-28 | 2026-05-29 | $9.00 | $270K | -2.0% | +7.8% | +35.4% |
| MASS | SELL · 10b5-1 | 2026-05-06 | 2026-05-07 | $7.23 | $145K | -15.2% | +1.5% | +5.5% |
| MASS | SELL · 10b5-1 | 2026-04-08 | 2026-04-10 | $7.06 | $282K | +0.1% | +11.2% | +14.7% |
| MASS | SELL | 2025-02-03 | 2025-02-04 | $2.34 | $18K | +18.3% | +28.1% | +129.8% |
| MASS | SELL | 2024-02-01 | 2024-02-02 | $7.01 | $28K | +6.2% | +3.6% | -18.8% |
| MASS | SELL | 2023-12-19 | 2023-12-21 | $9.10 | $305K | -4.6% | -10.3% | -24.9% |
| MASS | SELL · 10b5-1 | 2023-06-07 | 2023-06-09 | $10.03 | $45K | -18.3% | -17.6% | -26.1% |
| MASS | SELL · 10b5-1 | 2023-05-23 | 2023-05-25 | $10.02 | $100K | -0.4% | -27.9% | -21.6% |
| MASS | SELL | 2023-02-01 | 2023-02-03 | $9.91 | $115K | +1.1% | -11.9% | -30.9% |
| MASS | SELL | 2022-09-12 | 2022-09-14 | $19.58 | $783K | -8.5% | -18.3% | -46.8% |
| MASS | SELL | 2022-07-06 | 2022-07-08 | $21.28 | $213K | +0.6% | +2.6% | -23.0% |
| MASS | SELL | 2022-06-29 | 2022-07-01 | $20.21 | $741K | -14.0% | +7.7% | -24.5% |
| MASS | SELL | 2022-04-12 | 2022-04-14 | $20.06 | $394K | -12.9% | -15.7% | +6.2% |
| MASS | SELL | 2022-03-18 | 2022-03-21 | $20.06 | $399K | +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 | 2022-01-05 | 2022-01-07 | $23.67 | $473K | -24.4% | -22.9% | -5.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.