Key facts
- This page summarizes Christopher D. Brown's Form 4 filing for 908 Devices Inc. (MASS).
- 6 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 03 Feb 2026, 20:45.
Christopher D. Brown - 01 Feb 2026 Form 4 Insider Report for 908 Devices Inc. (MASS)
- Reporting relationship
- Director
- Issuer ticker
- MASS
- Reported as of
- 01 Feb 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 03 Feb 2026, 20:45:26 UTC
- Prior SEC filing
- 18 Jun 2025
- Next SEC filing
- 10 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Mark S. Levine, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Christopher D. Brown filed Form 4 for 908 Devices Inc. (MASS) on 03 Feb 2026.
Change
- Previous filing in this sequence was filed on 18 Jun 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001836988
Primary reporting owner
Brown Christopher D.
- Relationship
- Director
- Address
- C/O 908 DEVICES INC., 44 3RD AVENUE, BURLINGTON
- Signature
- /s/ Mark S. Levine, Attorney-in-Fact
- Signature date
- 03 Feb 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
MASS
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +5,027
- Change %
- +0.52%
- Price
- Shares after
- 967,149
- Date
- 01 Feb 2026
- Ownership
- Direct
- Footnotes
- F1
MASS
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +7,418
- Change %
- +0.77%
- Price
- Shares after
- 974,567
- Date
- 01 Feb 2026
- Ownership
- Direct
- Footnotes
- F1
MASS
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +10,992
- Change %
- +1.1%
- Price
- Shares after
- 985,559
- Date
- 01 Feb 2026
- Ownership
- Direct
- Footnotes
- F1
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
MASS
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- $0
- Shares
- -5,027
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 01 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 5,027
- Exercise price
- Footnotes
- F1, F2
MASS
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- $0
- Shares
- -7,418
- Change %
- -50%
- Price
- $0.000000
- Shares after
- 7,418
- Date
- 01 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 7,418
- Exercise price
- Footnotes
- F1, F3
MASS
transaction
Derivative
Restricted Stock Units
Options Exercise
- Transaction value
- $0
- Shares
- -10,992
- Change %
- -33%
- Price
- $0.000000
- Shares after
- 21,982
- Date
- 01 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 10,992
- Exercise price
- Footnotes
- F1, F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 4 footnotes
Footnote F1
Each Restricted Stock Unit ("RSU") represents a contingent right to receive, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.
Footnote F2
These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
Footnote F3
These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.
Footnote F4
These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.