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Insider Trading Intelligence
Pricing
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KK

Kevin J. Knopp

MASS
PRESIDENT AND CEO · 908 DEVICES INC. · CIK 0001836523
FILING MIX · LIFETIME32%/68%
BUYS
34
SELLS
73
TOTAL VALUE
$10.45M
COMPANIES
1
ACTIVE SINCE
Dec 2020
HOLDINGS NOW
732,825
AVG SELL PX
$15.89
TRADE KIND
SHOWING 107 / 107
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
53 backtested trades · 8 horizons · 8 pending
Forward-return performance of every backtestable P/S trade by Kevin J. Knopp, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d53+50.94%+4.15%+0.57%+3.58%+4.49%2.47
14d53+49.06%+6.54%+1.14%+5.40%+3.05%2.47
30d53+56.60%+2.35%+0.67%+1.68%-2.89%0.51
60d53+64.15%-6.36%+0.53%-6.89%-16.11%-1.72
90d53+69.81%-10.29%+0.97%-11.26%-23.64%-1.89
180d53(1 pending)+84.62%-29.28%+4.12%-33.39%-49.88%-4.40
1y53(1 pending)+86.54%-29.37%+9.41%-38.78%-50.39%-4.78
2y53(6 pending)+100.00%-61.05%+32.14%-93.18%-107.66%-17.26
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
MASS · 732,825 shares · as of Jun 26, 2026
0338,265676,5311,014,7961,353,061202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 34 buys / 73 sellsCOVERAGE · 23 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MASS
908 DEVICES INC.
SALE10b5-1
10b5-1 plan
2,798$9.09$25.4K732,825Jun 26, 2026Jun 30, 2026 ↗View →
MASS
908 DEVICES INC.
SALE10b5-1
10b5-1 plan
16,388$9.10$149.1K735,623Jun 25, 2026Jun 25, 2026 ↗View →
MASS
908 DEVICES INC.
SALE10b5-1
10b5-1 plan
40,535$9.14$370.5K752,011Jun 24, 2026Jun 25, 2026 ↗View →
MASS
908 DEVICES INC.
SALE10b5-1
10b5-1 plan
3,422$9.06$31.0K792,546Jun 23, 2026Jun 25, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
205,978——205,978Feb 2, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
34,764$6.18$214.8K795,968Feb 2, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
90,043——90,043Feb 2, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
17,007——764,444Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,255——0Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
11,255——733,988Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
66,288——132,576Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
13,449——13,448Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
17,007——34,014Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
66,288——830,732Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
13,449——747,437Feb 1, 2026Feb 3, 2026 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
15,000$4.44$66.6K722,733May 15, 2025May 19, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
15,000$4.32$64.8K707,733May 14, 2025May 14, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
198,864——198,864Mar 3, 2025Mar 5, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
90,518——90,518Mar 3, 2025Mar 5, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,318$2.33$10.1K704,416Feb 3, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
5,159$2.31$11.9K699,257Feb 3, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
6,524$2.32$15.1K692,733Feb 3, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
13,448——26,897Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
17,007——51,021Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
13,448——691,727Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
11,254——678,279Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
17,007——708,734Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,254——11,255Feb 1, 2025Feb 4, 2025 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
110,626$1.58$174.8K667,025Dec 13, 2024Dec 16, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
110,626——0Dec 13, 2024Dec 16, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
47,418$1.75$83.0K556,399Dec 13, 2024Dec 16, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
47,418——0Dec 13, 2024Dec 16, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
10,000$6.42$64.2K508,981May 13, 2024May 13, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
10,000$5.77$57.7K498,981May 10, 2024May 10, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
10,000$5.83$58.3K488,981May 9, 2024May 9, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
10,000$5.72$57.2K478,981May 8, 2024May 8, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
10,000$5.60$56.0K468,981May 7, 2024May 7, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
47,000$1.75$82.3K458,981Apr 16, 2024Apr 16, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
47,000——47,418Apr 16, 2024Apr 16, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
68,028——68,028Mar 1, 2024Mar 5, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
92,937——92,937Mar 1, 2024Mar 5, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,099$6.97$28.6K416,953Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,972$7.02$34.9K411,981Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
13,449——421,052Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
11,255——407,603Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
13,449——40,345Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,255——22,509Feb 1, 2024Feb 2, 2024 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
28,500$1.75$49.9K94,418Jun 5, 2023Jun 5, 2023 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
28,500$1.75$49.9K396,348Jun 5, 2023Jun 5, 2023 ↗View →
MASS
908 DEVICES INC.
SALE10b5-1
10b5-1 plan
60,000$10.12$607.2K367,848May 23, 2023May 25, 2023 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
53,794——53,794Mar 1, 2023Mar 16, 2023 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
53,794——53,794Mar 1, 2023Mar 16, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,842$10.12$49.0K427,848Feb 16, 2023Feb 17, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
15,158$10.29$156.0K432,690Feb 15, 2023Feb 17, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
40,000$10.51$420.4K447,848Feb 2, 2023Feb 3, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,255——33,764Feb 1, 2023Feb 3, 2023 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
11,255——491,897Feb 1, 2023Feb 3, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,049$9.36$37.9K487,848Feb 1, 2023Feb 3, 2023 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
1,013$12.40$12.6K480,642Nov 15, 2022Nov 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
6,619$11.76$77.8K481,655Nov 15, 2022Nov 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
12,368$10.54$130.4K488,274Nov 15, 2022Nov 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
18,800$15.32$288.0K500,642Oct 18, 2022Oct 19, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,200$14.68$164.4K519,442Oct 17, 2022Oct 19, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
30,000$16.94$508.2K530,642Sep 15, 2022Sep 19, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
27,627$19.23$531.3K563,015Aug 15, 2022Aug 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
2,373$19.72$46.8K560,642Aug 15, 2022Aug 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
286$25.17$7.2K590,642Aug 8, 2022Aug 9, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
25,910$25.32$656.0K590,928Aug 5, 2022Aug 9, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
14,647$22.46$329.0K616,838Aug 1, 2022Aug 1, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
18,000$22.22$400.0K631,485Jul 29, 2022Aug 1, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
5,700$22.01$125.5K649,485Jul 28, 2022Aug 1, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
200$22.04$4.4K655,185Jul 21, 2022Jul 25, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
11,769$16.80$197.7K673,616Jul 15, 2022Jul 19, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
18,231$17.74$323.4K655,385Jul 15, 2022Jul 19, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
453$22.06$10.0K685,385Jul 8, 2022Jul 8, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
1,000$22.07$22.1K685,838Jul 6, 2022Jul 8, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
9,200$15.07$138.6K686,838Jun 21, 2022Jun 22, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
2,000$15.01$30.0K696,038Jun 15, 2022Jun 17, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
18,800$14.62$274.9K698,038Jun 15, 2022Jun 17, 2022 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
45,019——45,019Mar 1, 2022Mar 3, 2022 ↗View →
MASS
908 DEVICES INC.
PURCHASEGRANT
Stock grant
74,776——74,776Mar 1, 2022Mar 3, 2022 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
3,897$33.71$131.4K732,941Nov 1, 2021Nov 2, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
8,328$35.27$293.7K716,838Nov 1, 2021Nov 2, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
7,775$34.38$267.3K725,166Nov 1, 2021Nov 2, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,829$33.73$162.9K742,310Oct 1, 2021Oct 5, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
9,699$32.89$319.0K747,139Oct 1, 2021Oct 5, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
5,472$34.93$191.1K736,838Oct 1, 2021Oct 5, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
5,599$35.40$198.2K771,239Sep 1, 2021Sep 3, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
3,583$36.37$130.3K756,838Sep 1, 2021Sep 3, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
10,818$36.02$389.7K760,421Sep 1, 2021Sep 3, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
12,000$30.44$365.3K776,838Aug 18, 2021Aug 18, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
4,000$30.01$120.0K788,838Aug 17, 2021Aug 18, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
3,443$31.22$107.5K808,395Aug 16, 2021Aug 18, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
6,035$30.76$185.6K802,360Aug 16, 2021Aug 18, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
9,522$30.22$287.8K792,838Aug 16, 2021Aug 18, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President & CEO
4,396——0Dec 22, 2020Dec 22, 2020 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
35,446——541,223Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
2,638——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
25,229——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
1,758——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
37,845——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
8,459——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President and CEO
12,688——0Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President and CEO
53,171——811,838Dec 22, 2020Apr 30, 2021 ↗View →
MASS
908 DEVICES INC.
SALE
President & CEO
63,074——0Dec 22, 2020Dec 22, 2020 ↗View →
MASS
908 DEVICES INC.
PURCHASE
President & CEO
88,617——1,353,061Dec 22, 2020Dec 22, 2020 ↗View →
MASS
908 DEVICES INC.
SALE
President & CEO
21,147——0Dec 22, 2020Dec 22, 2020 ↗View →
Other insiders · MASS
Loading peer insiders…
About this filer
CIK 0001836523
ROLE
President and CEO
PRIMARY
MASS
COMPANIES
1
ACTIVE SINCE
Dec 2020
MARKETPEEL · /INSIDER/0001836523DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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