Insider · CIK 0001836876
John Kenneweg
Files at MASS (908 Devices Inc.). First filing May 4, 2026, latest Sep 17, 2026.
John Kenneweg files SEC Form 4 as officer at MASS (908 Devices Inc.). Since May 4, 2026, John Kenneweg has reported 0 open-market buys worth $0 and 3 open-market sells worth $481k, the latest filed on Sep 17, 2026.
A track record needs three past buys with six months of prices behind them; John Kenneweg has 0, so none is measured yet.
The newest scored trade: sold $280k of MASS on Sep 15, 2026, filed Sep 17, 2026, scored 19 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 3 sells worth $481k.
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.
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 |
|---|---|---|---|---|---|
| 19Weak | 908 Devices Inc. | $280k 27,656 shares | -47% | +96% from low-10% from high | |
| 46Moderate | 908 Devices Inc. | $148k 18,255 shares | -24% | +89% from low-11% from high | |
| 22Weak | 908 Devices Inc. | $53k 7,787 shares | -9% | +58% from low-26% from high |
Transactions
Every row this insider has filed, 14 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock10b5-1 | +1,000 | $0.96 | $960 | 58,784 | 26 d ago |
| Sep 15, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -1,000 | $10.00 | $10k | 57,784 | 26 d ago |
| Sep 16, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock10b5-1 | +21,399 | $0.96 | $21k | 79,183 | 26 d ago |
| Sep 16, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -21,399 | $10.11 | $216k | 57,784 | 26 d ago |
| Sep 17, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock10b5-1 | +5,257 | $0.96 | $5,047 | 63,041 | 26 d ago |
| Sep 17, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock10b5-1 | -5,257 | $10.22 | $54k | 57,784 | 26 d ago |
| Sep 15, 2026 | MASS 908 Devices Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -1,000 | $0.00 | $0 | 26,656 | 26 d ago |
| Sep 16, 2026 | MASS 908 Devices Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -21,399 | $0.00 | $0 | 5,257 | 26 d ago |
| Sep 17, 2026 | MASS 908 Devices Inc. | MOption exercise Stock Option (right to buy)derivative10b5-1 | -5,257 | $0.00 | $0 | 0 | 26 d ago |
| May 8, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -18,255 | $8.11 | $148k | 57,784 | May 11, 2026 |
| May 1, 2026 | MASS 908 Devices Inc. | MOption exercise Common Stock | +26,042 | - | - | 83,826 | May 4, 2026 |
| May 1, 2026 | MASS 908 Devices Inc. | SOpen-market sale Common Stock | -7,787 | $6.83 | $53k | 76,039 | May 4, 2026 |
| May 1, 2026 | MASS 908 Devices Inc. | MOption exercise Performance Stock Unitsderivative | -26,042 | $0.00 | $0 | 0 | May 4, 2026 |
| Apr 28, 2026 | MASS 908 Devices Inc. | AGrant or award Performance Stock Unitsderivative | +26,042 | $0.00 | $0 | 26,042 | Apr 29, 2026 |
Questions about John Kenneweg
Answered from the filings on this page, as of the latest one.
Is John Kenneweg buying or selling?
In the last 12 months John Kenneweg reported 0 open-market buys worth $0 and 3 open-market sells worth $481k on SEC Form 4; the latest was sold $280k of MASS on Sep 15, 2026. Grants, option exercises and tax withholding are not counted.
How did John Kenneweg's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and John Kenneweg has 0.
Where does John Kenneweg file Form 4?
John Kenneweg has filed Form 4 at MASS (908 Devices Inc.) as SVP, Sales & Product Marketing. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.