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908 Devices Inc.

MASS Net selling
CIK 0001555279 #3233 in the set updated 21 Sep 2026
Bought (120 mo)
$15.99M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$37.75M
$5.17M on a plan · $13.07M straight out of an exercise
Sold at will
$19.52M
111 of 220 sales
Net
−$21.76M
−$3.52M against sales at will

By person

21 insiders · 253 transactions
Insider
Role
Bought
Sold
Net
Holding
Worth
Change
Knopp Kevin J.
President and CEO
$424.78K (7)
$11.35M (57)
−$10.93M
1,097,191
$11.21M
−13.2%
Brown Christopher D.
Director
$7.56M (51)
−$7.56M
775,559
$7.93M
−29.8%
ARCH Venture Fund VII, L.P. entity
10% owner
$6.00M (1)
+$6.00M
5,725,045
$58.51M
CRANDELL KEITH
Director
$6.00M (1)
+$6.00M
5,764,419
$58.91M
Basarsky Trent A.
VP, Corporate Development
$100.00K (1)
$4.99M (22) scheduled
−$4.89M
80,000
$817.60K
+1,233%
Griffith Joseph H. IV
Chief Financial Officer
$4.46M (31) scheduled
−$4.46M
121,497
$1.24M
+28.7%
AWM Investment Company, Inc. entity
10% owner
$3.68M (15)
−$3.68M
9,667,264
$98.80M
−4.2%
Kenneweg John
SVP, Sales & Product Marketing
$3.29M (20) scheduled
−$3.29M
57,784
$590.55K
0.0%
Kedar Sharon
Director
$2.00M (1)
+$2.00M
1,077,091
$11.01M
Turner Michael S.
Chief Legal & Admin Officer
$100.00K (1)
$1.69M (16) scheduled
−$1.59M
0
$0.00
HRUSOVSKY E KEVIN
Director
$1.00M (1)
+$1.00M
301,889
$3.09M
BARTHELEMY NICOLAS
Director
$280.00K (1)
$516.37K (3) scheduled
−$236.37K
28,920
$295.56K
McCallion Kevin J.
SVP, Products and Production
$188.02K (4) scheduled
−$188.02K
44,925
$459.13K
0.0%
Spoto Mark
Director
$87.80K (4)
+$87.80K
258,012
$2.64M
Fitzpatrick Maura
VP, Product Management & Mktg
$14.66K (1) scheduled
−$14.66K
2,834
$28.96K
Hunt Anthony
Director
44,168
$451.40K
ELOI FENEL M
Director
40,897
$417.97K
Leonhart Michele M.
Director
27,054
$276.49K
George Jeffrey P.
Director
26,814
$274.04K
Eisenberg Marcia
Director
25,957
$265.28K
Vann Brandi C
Director
5,192
$53.06K

No percentages here. These insiders hold more than one class of share between them, and the share count on file covers one of them rather than all. Dividing the two would compare different things.

Insider
Date
Role
Action
Shares
Price
Amount
Knopp Kevin J.
15 May 2025
President and CEO
Buy
15,000
$4.44
$66.60K
Knopp Kevin J.
14 May 2025
President and CEO
Buy
15,000
$4.32
$64.79K
Spoto Mark
14 May 2025
Director
Buy
3,000
$4.25
$12.75K
Spoto Mark
14 May 2025
Director
Buy
7,000
$4.30
$30.10K
Knopp Kevin J.
13 May 2024
President and CEO
Buy
10,000
$6.42
$64.20K
Knopp Kevin J.
10 May 2024
President and CEO
Buy
10,000
$5.77
$57.70K
Knopp Kevin J.
9 May 2024
President and CEO
Buy
10,000
$5.83
$58.30K
Knopp Kevin J.
8 May 2024
President and CEO
Buy
10,000
$5.72
$57.20K
Knopp Kevin J.
7 May 2024
President and CEO
Buy
10,000
$5.60
$56.00K
Spoto Mark
22 Nov 2022
Director
Buy
2,585
$9.65
$24.95K
Spoto Mark
22 Dec 2020
Director
Buy
1,000
$20.00
$20.00K
CRANDELL KEITH
22 Dec 2020
Director
Buy indirect
300,000
$20.00
$6.00M
BARTHELEMY NICOLAS
22 Dec 2020
Director
Buy
14,000
$20.00
$280.00K
Basarsky Trent A.
22 Dec 2020
Vice President, Commercial
Buy
5,000
$20.00
$100.00K
ARCH Venture Fund VII, L.P.
22 Dec 2020
10% owner
Buy
300,000
$20.00
$6.00M
Showing 250 of 253 transactions. The figures above use every one of them.

What was left out

Form 4 filings counted 241
Amendments (4/A) skipped 4
Filings about a different issuer 0
Unreadable filings 0
Joint filings 1
Sales on a Rule 10b5-1 plan 34
Sales straight out of an exercise 75
Sales at will 111
Transactions with no price 0
Shares from compensation/vesting 15,845,084
Sales filed before the plan box existed 70
History held since 21 Dec 2020