908 Devices Inc.

MASSNASDAQHealthcare● Active

$8.10

+$0.17(+2.14%)

Market Cap$306290330

P/E Ratio—

52W High$9.34

52W Low$5.025

Avg Volume275K

Open$8.14

Beta0.64

Insider Trades Ownership Employees

908 Devices Inc. (MASS) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · MASS · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

908 Devices Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

MASS insider buying and selling by quarter

MASS insider selling · MASS insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

781K390K0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · MASS ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

MASS executive sell shares · MASS board member insider trading · MASS insider trading SEC filing

Showing 39 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Jun 4, 2026	Brown Christopher D. Director	Sale	100	$9.00	$900	875,459	Form 4
Jun 3, 2026	Brown Christopher D. Director	Sale	20,000	$8.73	$175K	875,559	Form 4
May 28, 2026	Brown Christopher D. Director	Sale	30,000	$9.00	$270K	895,559	Form 4
May 28, 2026	Griffith Joseph H. IV CFO	Sale	6,940	$9.03	$63K	132,956	Form 4
May 11, 2026	AWM Investment Company, Inc. 10 percent owner	Sale	5,000	$8.25	$41K	5,116,715	Form 4
May 8, 2026	Kenneweg John SVP, Sales & Product Marketing	Sale	18,255	$8.11	$148K	57,784	Form 4
May 6, 2026	Brown Christopher D. Director	Sale	20,000	$7.23	$145K	925,559	Form 4
May 1, 2026	Kenneweg John SVP, Sales & Product Marketing	Option	26,042	—	—	83,826	Form 4
May 1, 2026	Kenneweg John SVP, Sales & Product Marketing	Sale	7,787	$6.83	$53K	76,039	Form 4
Apr 10, 2026	McCallion Kevin J. SVP, Products and Production	Option	2,693	$1.05	$3K	47,618	Form 4
Apr 10, 2026	McCallion Kevin J. SVP, Products and Production	Sale	2,693	$7.01	$19K	44,925	Form 4
Apr 8, 2026	McCallion Kevin J. SVP, Products and Production	Option	18,580	$1.05	$20K	63,505	Form 4
Apr 9, 2026	McCallion Kevin J. SVP, Products and Production	Option	5,420	$1.05	$6K	50,345	Form 4
Apr 8, 2026	McCallion Kevin J. SVP, Products and Production	Sale	18,580	$7.05	$131K	44,925	Form 4
Apr 9, 2026	McCallion Kevin J. SVP, Products and Production	Sale	5,420	$7.03	$38K	44,925	Form 4
Apr 8, 2026	Brown Christopher D. Director	Sale	15,030	$7.05	$106K	970,529	Form 4
Apr 9, 2026	Brown Christopher D. Director	Sale	7,392	$7.04	$52K	963,137	Form 4
Apr 10, 2026	Brown Christopher D. Director	Sale	17,578	$7.07	$124K	945,559	Form 4
Mar 2, 2026	McCallion Kevin J. SVP, Products and Production	Sale	7	$7.00	$49	44,918	Form 4
Feb 1, 2026	Brown Christopher D. Director	Option	10,992	—	—	985,559	Form 4
Feb 1, 2026	Brown Christopher D. Director	Option	7,418	—	—	974,567	Form 4
Feb 1, 2026	Brown Christopher D. Director	Option	5,027	—	—	967,149	Form 4
Feb 1, 2026	Knopp Kevin J. President and CEO · Director	Option	66,288	—	—	830,732	Form 4
Feb 2, 2026	Knopp Kevin J. President and CEO · Director	Sale	34,764	$6.18	$215K	795,968	Form 4
Feb 1, 2026	Knopp Kevin J. President and CEO · Director	Option	17,007	—	—	764,444	Form 4

Brown Christopher D.

Director

Sale

Date

Jun 4

100

Price

$9.00

Value

$900

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

Jun 3

20,000

Price

$8.73

Value

$175K

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

May 28

30,000

Price

$9.00

Value

$270K

View Form 4 on SEC.gov

Griffith Joseph H. IV

CFO

Sale

Date

May 28

6,940

Price

$9.03

Value

$63K

View Form 4 on SEC.gov

AWM Investment Company, Inc.

10 percent owner

Sale

Date

May 11

5,000

Price

$8.25

Value

$41K

View Form 4 on SEC.gov

Kenneweg John

SVP, Sales & Product Marketing

Sale

Date

May 8

18,255

Price

$8.11

Value

$148K

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

May 6

20,000

Price

$7.23

Value

$145K

View Form 4 on SEC.gov

Kenneweg John

SVP, Sales & Product Marketing

Option

Date

May 1

26,042

Price

—

Value

—

View Form 4 on SEC.gov

Kenneweg John

SVP, Sales & Product Marketing

Sale

Date

May 1

7,787

Price

$6.83

Value

$53K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Option

Date

Apr 10

2,693

Price

$1.05

Value

$3K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Sale

Date

Apr 10

2,693

Price

$7.01

Value

$19K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Option

Date

Apr 8

18,580

Price

$1.05

Value

$20K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Option

Date

Apr 9

5,420

Price

$1.05

Value

$6K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Sale

Date

Apr 8

18,580

Price

$7.05

Value

$131K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Sale

Date

Apr 9

5,420

Price

$7.03

Value

$38K

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

Apr 8

15,030

Price

$7.05

Value

$106K

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

Apr 9

7,392

Price

$7.04

Value

$52K

View Form 4 on SEC.gov

Brown Christopher D.

Director

Sale

Date

Apr 10

17,578

Price

$7.07

Value

$124K

View Form 4 on SEC.gov

McCallion Kevin J.

SVP, Products and Production

Sale

Date

Mar 2

Price

$7.00

Value

$49

View Form 4 on SEC.gov

Brown Christopher D.

Director

Option

Date

Feb 1

10,992

Price

—

Value

—

View Form 4 on SEC.gov

Brown Christopher D.

Director

Option

Date

Feb 1

7,418

Price

—

Value

—

View Form 4 on SEC.gov

Brown Christopher D.

Director

Option

Date

Feb 1

5,027

Price

—

Value

—

View Form 4 on SEC.gov

Knopp Kevin J.

President and CEO · Director

Option

Date

Feb 1

66,288

Price

—

Value

—

View Form 4 on SEC.gov

Knopp Kevin J.

President and CEO · Director

Sale

Date

Feb 2

34,764

Price

$6.18

Value

$215K

View Form 4 on SEC.gov

Knopp Kevin J.

President and CEO · Director

Option

Date

Feb 1

17,007

Price

—

Value

—

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

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▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About MASS insider trading

MASS insider trades

908 Devices Inc. (MASS) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Brown Christopher D. (Director), Griffith Joseph H. IV (CFO), McCallion Kevin J. (SVP, Products and Production). Over the past 12 months, 5 insiders have filed transactions with the SEC. MASS insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For 908 Devices Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

MASS insider trading · 5 questions

The insiders of 908 Devices Inc. (MASS) include executives and directors such as Brown Christopher D. (Director), Griffith Joseph H. IV (CFO), McCallion Kevin J. (SVP, Products and Production), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

MASS board member insider tradingwho are MASS insidersMASS insider roster908 Devices Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026