Kolawole A. Otitoju - 21 Apr 2026 Form 4 Insider Report for 908 Devices Inc. (MASS)

Reporting relationship: Chief Bus. & Strategy Officer
Issuer ticker: MASS
Reported as of: 21 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 Apr 2026, 08:08:48 UTC
Source filing: View source filing
Reporting owner signature: /s/ Mark S. Levine, Attorney-in-Fact

Key filing fact

Kolawole A. Otitoju filed Form 4 for 908 Devices Inc. (MASS) on 22 Apr 2026.

Key facts

This page summarizes Kolawole A. Otitoju's Form 4 filing for 908 Devices Inc. (MASS).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 22 Apr 2026, 08:08.

Change

No earlier filing in this sequence is available for direct comparison.
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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002127645 Primary reporting owner

Otitoju Kolawole A.

Relationship: Chief Bus. & Strategy Officer
Address: C/O 908 DEVICES INC., 44 3RD AVENUE, BURLINGTON
Signature: /s/ Mark S. Levine, Attorney-in-Fact
Signature date: 22 Apr 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MASS transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +146,789
Change %
Price: $0.000000^*
Shares after: 146,789
Date: 21 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 146,789
Exercise price: $7.26
Footnotes: F1

MASS transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +110,193
Change %
Price: $0.000000^*
Shares after: 110,193
Date: 21 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 110,193
Exercise price
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

One-third of the shares underlying the option become vested and exercisable on May 1, 2027, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following May 1, 2027, subject to the reporting person's continued service through the applicable vesting date.

Footnote F2

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

Footnote F3

These RSUs vest in three substantially equal annual installments at the three anniversary dates following May 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.