MASS

insider transactions

908 Devices Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Net shares · 30d

-286.3K

0 buy · 286.3K sell

Net value · 30d

-$2.5M

$0 in · $2.5M out

Sentiment · 30d

Net selling

0% buying · 100% selling

Open-market trades · 30d

0 buy · 286.3K sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Grant·A
Jun 11, 26

Vann Brandi C

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

Vann Brandi C

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

Leonhart Michele M.

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

Leonhart Michele M.

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

Spoto Mark

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

Spoto Mark

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

Hunt Anthony

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

Hunt Anthony

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

HRUSOVSKY E KEVIN

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

HRUSOVSKY E KEVIN

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

ELOI FENEL M

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

ELOI FENEL M

Director

$0

13.7K sh

Own New
Grant·A
Jun 11, 26

CRANDELL KEITH

Director

$0

6.2K sh

Own New
Grant·A
Jun 11, 26

CRANDELL KEITH

Director

$0

13.7K sh

Own New
Exercise·M
Jun 10, 26

Leonhart Michele M.

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

Leonhart Michele M.

Director

—

14.1K sh

Own +217%
Exercise·M
Jun 10, 26

Spoto Mark

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

Spoto Mark

Director

—

14.1K sh

Own +19%
Exercise·M
Jun 10, 26

Hunt Anthony

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

Hunt Anthony

Director

—

14.1K sh

Own +47%
Exercise·M
Jun 10, 26

HRUSOVSKY E KEVIN

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

HRUSOVSKY E KEVIN

Director

—

14.1K sh

Own +9%
Exercise·M
Jun 10, 26

ELOI FENEL M

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

ELOI FENEL M

Director

—

14.1K sh

Own +53%
Exercise·M
Jun 10, 26

CRANDELL KEITH

Director

$0

14.1K sh

Own New
Exercise·M
Jun 10, 26

CRANDELL KEITH

Director

—

14.1K sh

Own +56%
Sell·S
Jun 4, 26

AWM Investment Company, Inc.

10% Owner

$356.9K

39.8K sh · $8.97

Own -1%
Sell·S
Jun 4, 26

Brown Christopher D.

Director · 10b5-1

$900

100 sh · $9.00

Own -0%
Sell·S
Jun 3, 26

Brown Christopher D.

Director · 10b5-1

$174.6K

20.0K sh · $8.73

Own -2%
Sell·S
Jun 2, 26

AWM Investment Company, Inc.

10% Owner

$22.4K

2.5K sh · $8.95

Own -0%
Sell·S
May 28, 26

Brown Christopher D.

Director · 10b5-1

$270.0K

30.0K sh · $9.00

Own -3%
Sell·S
May 28, 26

AWM Investment Company, Inc.

10% Owner

$1.5M

170.4K sh · $8.66

Own -3%
Sell·S
May 28, 26

Griffith Joseph H. IV KEY

Chief Financial Officer · 10b5-1

$62.7K

6.9K sh · $9.03

Own -5%
Sell·S
May 27, 26

AWM Investment Company, Inc.

10% Owner

$123.8K

15.0K sh · $8.25

Own -0%
Sell·S
May 27, 26

AWM Investment Company, Inc.

10% Owner

$12.4K

1.5K sh · $8.25

Own -0%

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 11, 2026	Vann Brandi C	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	Vann Brandi C	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	Leonhart Michele M.	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	Leonhart Michele M.	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	Spoto Mark	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	Spoto Mark	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	Hunt Anthony	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	Hunt Anthony	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	HRUSOVSKY E KEVIN	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	HRUSOVSKY E KEVIN	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	ELOI FENEL M	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	ELOI FENEL M	Director	Grant A	13.7K	New	—	$0
Jun 11, 2026	CRANDELL KEITH	Director	Grant A	6.2K	New	—	$0
Jun 11, 2026	CRANDELL KEITH	Director	Grant A	13.7K	New	—	$0
Jun 10, 2026	Leonhart Michele M.	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	Leonhart Michele M.	Director	Exercise M	14.1K	+217%	—	—
Jun 10, 2026	Spoto Mark	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	Spoto Mark	Director	Exercise M	14.1K	+19%	—	—
Jun 10, 2026	Hunt Anthony	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	Hunt Anthony	Director	Exercise M	14.1K	+47%	—	—
Jun 10, 2026	HRUSOVSKY E KEVIN	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	HRUSOVSKY E KEVIN	Director	Exercise M	14.1K	+9%	—	—
Jun 10, 2026	ELOI FENEL M	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	ELOI FENEL M	Director	Exercise M	14.1K	+53%	—	—
Jun 10, 2026	CRANDELL KEITH	Director	Exercise M	14.1K	New	—	$0
Jun 10, 2026	CRANDELL KEITH	Director	Exercise M	14.1K	+56%	—	—
Jun 4, 2026	AWM Investment Company, Inc.	10% Owner	Sell S	39.8K	-1%	$8.97	$356.9K
Jun 4, 2026	Brown Christopher D. 10b5-1	Director	Sell S	100	-0%	$9.00	$900
Jun 3, 2026	Brown Christopher D. 10b5-1	Director	Sell S	20.0K	-2%	$8.73	$174.6K
Jun 2, 2026	AWM Investment Company, Inc.	10% Owner	Sell S	2.5K	-0%	$8.95	$22.4K
May 28, 2026	Brown Christopher D. 10b5-1	Director	Sell S	30.0K	-3%	$9.00	$270.0K
May 28, 2026	AWM Investment Company, Inc.	10% Owner	Sell S	170.4K	-3%	$8.66	$1.5M
May 28, 2026	Griffith Joseph H. IV KEY 10b5-1	Chief Financial Officer	Sell S	6.9K	-5%	$9.03	$62.7K
May 27, 2026	AWM Investment Company, Inc.	10% Owner	Sell S	15.0K	-0%	$8.25	$123.8K
May 27, 2026	AWM Investment Company, Inc.	10% Owner	Sell S	1.5K	-0%	$8.25	$12.4K

About MASS insider trading

This page tracks insider transactions for 908 Devices Inc. (MASS) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.