Insider · CIK 0001431531
Joseph H. Griffith IV
cfoofficer
Files at MASS (908 Devices Inc.). First filing Feb 4, 2025, latest Oct 8, 2026.
Track record
Not enough history
Fewer than three past buys with six months of prices.
Median 6-month excess
-
after past buys, n = 0
Hit rate
-
past buys that beat the index over 6 months
Open-market trades
0 / 6
$0 bought, $362k sold
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
MASS: 908 Devices Inc.
MASSOct 9, 2026 · close 12.05
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 25Weak | 908 Devices Inc. | $65k 5,000 shares | -4% | +142% from low-4% from high | |
| 31Weak | 908 Devices Inc. | $143k 23,175 shares | -14% | +213% from low-32% from high | |
| 8Weak | 908 Devices Inc. | $45k 5,000 shares | -5% | +365% from low-3% from high | |
| 8Weak | 908 Devices Inc. | $35k 5,000 shares | -5% | +288% from low-8% from high | |
| 17Weak | 908 Devices Inc. | $49k 6,940 shares | -6% | +267% from low0% from high | |
| 22Weak | 908 Devices Inc. | $24k 10,236 shares | -9% | - |
Transactions
Every row this insider has filed, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Oct 6, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -5,000 | $13.03 | $65k | 116,497 | 4 d ago |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock | +5,102 | - | - | 98,032 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock | +10,306 | - | - | 108,338 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock | +11,260 | - | - | 119,598 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock | +43,473 | - | - | 163,071 | Feb 3, 2026 |
| Feb 2, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -23,175 | $6.18 | $143k | 139,896 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -5,102 | $0.00 | $0 | 0 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -10,306 | $0.00 | $0 | 10,306 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -11,260 | $0.00 | $0 | 22,521 | Feb 3, 2026 |
| Feb 1, 2026 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -43,473 | $0.00 | $0 | 86,945 | Feb 3, 2026 |
| Feb 2, 2026 | MASS 908 Devices Inc. | AGrant or award Restricted Stock Unitsderivative | +121,164 | $0.00 | $0 | 121,164 | Feb 3, 2026 |
| Feb 2, 2026 | MASS 908 Devices Inc. | AGrant or award Stock Option (option to buy)derivative | +52,967 | $0.00 | $0 | 52,967 | Feb 3, 2026 |
| Oct 2, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -708 | $9.04 | $6,398 | 97,222 | Oct 6, 2025 |
| Oct 3, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -4,292 | $9.05 | $39k | 92,930 | Oct 6, 2025 |
| Sep 19, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -5,000 | $7.07 | $35k | 97,930 | Sep 23, 2025 |
| Jun 4, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -6,940 | $7.08 | $49k | 102,930 | Jun 6, 2025 |
| Mar 3, 2025 | MASS 908 Devices Inc. | AGrant or award Stock Option (option to buy)derivative | +59,362 | $0.00 | $0 | 59,362 | Mar 5, 2025 |
| Mar 3, 2025 | MASS 908 Devices Inc. | AGrant or award Restricted Stock Unitsderivative | +130,418 | $0.00 | $0 | 130,418 | Mar 5, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Common Stock | +5,102 | - | - | 98,539 | Feb 4, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Common Stock | +10,306 | - | - | 108,845 | Feb 4, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Common Stock | +11,261 | - | - | 120,106 | Feb 4, 2025 |
| Feb 3, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -1,960 | $2.34 | $4,582 | 118,146 | Feb 4, 2025 |
| Feb 3, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -3,955 | $2.34 | $9,235 | 114,191 | Feb 4, 2025 |
| Feb 3, 2025 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -4,321 | $2.35 | $10k | 109,870 | Feb 4, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -5,102 | $0.00 | $0 | 5,102 | Feb 4, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -10,306 | $0.00 | $0 | 20,612 | Feb 4, 2025 |
| Feb 1, 2025 | MASS 908 Devices Inc. | MOption exercise Restricted Stock Unitsderivative | -11,261 | $0.00 | $0 | 33,781 | Feb 4, 2025 |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.