GRIFFITH JOSEPH H. IV (Chief Financial Officer) sold 14.2% of their position (23.18K shares) of 908 DEVICES INC. on the open market

Open‑market sale worth $143.2K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

GRIFFITH JOSEPH H. IV

Filed: 2/3/2026ACC: 0001431531-26-000002

InsiderGRIFFITH JOSEPH H. IVCIK 1431531

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Issuer908 DEVICES INC.CIK 1555279

Officer· Chief Financial Officer

Since Dec 2020

+150.96K

Net shares

Net buyer

$143.2K

Total sold

Open market trades

0B · 1S

Total transactions

244.27K acquired · 93.32K disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

+5.10K

Price / share

—

Trade value

—

% of position

5.5%

2/1/2026

92.93K→98.03K

Common Stock

Direct

M · Option Exercise

+10.31K

Price / share

—

Trade value

—

% of position

10.5%

2/1/2026

98.03K→108.34K

Common Stock

Direct

M · Option Exercise

+11.26K

Price / share

—

Trade value

—

% of position

10.4%

2/1/2026

108.34K→119.60K

Common Stock

Direct

M · Option Exercise

+43.47K

Price / share

—

Trade value

—

% of position

36.3%

2/1/2026

119.60K→163.07K

Common Stock

Direct

S · Sale

−23.18K

Price / share

$6.18

Trade value

$143.22K

% of position

14.2%

2/2/2026

163.07K→139.90K

Total

Net shares

+46.97K

Net value

-$143.22K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	2/1/2026	M · Option Exercise	+5.10K	—	—	5.5%	92.93K	98.03K
Common Stock Direct	2/1/2026	M · Option Exercise	+10.31K	—	—	10.5%	98.03K	108.34K
Common Stock Direct	2/1/2026	M · Option Exercise	+11.26K	—	—	10.4%	108.34K	119.60K
Common Stock Direct	2/1/2026	M · Option Exercise	+43.47K	—	—	36.3%	119.60K	163.07K
Common Stock Direct	2/2/2026	S · Sale	−23.18K	$6.18	$143.22K	14.2%	163.07K	139.90K
Total			+46.97K		-$143.22K

Derivative Transactions6

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

5.10K shares

−5.10K

Strike price

Held after

0.00

Exercisable

—

2/1/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

10.31K shares

−10.31K

Strike price

Held after

10.31K

Exercisable

—

2/1/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

11.26K shares

−11.26K

Strike price

Held after

22.52K

Exercisable

—

2/1/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

43.47K shares

−43.47K

Strike price

Held after

86.94K

Exercisable

—

2/1/2026

Restricted Stock Units

Direct

A · Award

Converts to

Common Stock

121.16K shares

+121.16K

Strike price

Held after

121.16K

Exercisable

—

2/2/2026

Stock Option (option to buy)

Direct

A · Award

Converts to

Common Stock

52.97K shares

+52.97K

Strike price

6.19

Held after

52.97K

Exercisable

—

2/2/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock5.10K shares	2/1/2026	M · Option Exercise	−5.10K		—	0.00
Restricted Stock Units Direct	Common Stock10.31K shares	2/1/2026	M · Option Exercise	−10.31K		—	10.31K
Restricted Stock Units Direct	Common Stock11.26K shares	2/1/2026	M · Option Exercise	−11.26K		—	22.52K
Restricted Stock Units Direct	Common Stock43.47K shares	2/1/2026	M · Option Exercise	−43.47K		—	86.94K
Restricted Stock Units Direct	Common Stock121.16K shares	2/2/2026	A · Award	+121.16K		—	121.16K
Stock Option (option to buy) Direct	Common Stock52.97K shares	2/2/2026	A · Award	+52.97K	6.19	—	52.97K