MASS Form 4: Brandi Vann granted RSUs and options; late filing noted

Rhea-AI Filing Summary

908 Devices insider Brandi C. Vann received equity awards on 08/01/2025. The filing reports 15,577 Restricted Stock Units (RSUs) and a stock option to buy 20,409 shares at $5.14. The RSUs convert one-for-one to common shares when vested and vest in substantially equal annual installments over three years, subject to continued service with prorated vesting on termination. The option shares vest in substantially equal monthly installments over 36 months beginning 08/01/2025. The Form 4 was filed late due to an inadvertent administrative error.

Positive

• Time‑based vesting aligns insider incentives with long‑term company performance
• Clear disclosure of vesting schedules and prorated treatment on termination

Negative

• Late filing noted as an inadvertent administrative error, indicating disclosure control weakness
• Potential dilution from 35,986 total underlying shares (15,577 RSUs + 20,409 option shares) upon vesting/exercise

Insights

Financial Analyst

TL;DR: Routine equity compensation increases insider stake but is not immediately dilutive; late filing raises minor governance oversight concerns.

The awards—15,577 RSUs and an option for 20,409 shares at a $5.14 exercise price—are standard time-based compensation tied to continued service. Vesting schedules (annual over three years for RSUs; monthly over 36 months for options) align incentives with retention. Immediate ownership increases by 15,577 shares reported as beneficially owned; options are granted but not yet exercisable in full. The late filing is noted but described as inadvertent and administrative.

Corporate Governance Expert

TL;DR: Grants and vesting are customary; the tardy Form 4 suggests a need to tighten disclosure controls.

From a governance perspective, the grant structure is conventional for a director/officer and ties compensation to service. The filing discloses contingency and prorated vesting, which clarifies transferability and forfeiture on termination. However, the admission that the Form 4 was filed late indicates a lapse in reporting processes that the company should address to ensure compliance with Section 16 timeliness requirements.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vann Brandi C

(Last) (First) (Middle)

C/O 908 DEVICES INC.

44 THIRD AVENUE

(Street)

BURLINGTON MA 01803

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
908 Devices Inc. [ MASS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	08/01/2025		A		15,577		(3)	(3)	Common Stock	15,577	$0.00	15,577	D
Stock Option (option to buy)	$5.14	08/01/2025		A		20,409		(4)	07/31/2025	Common Stock	20,409	$0.00	20,409	D

Explanation of Responses:

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

2. This Form 4 is being filed late due to an inadvertent administrative error.

3. The RSUs become vested in substantially equal annual installments over the 3 years following August 1, 2025, subject to the reporting person's continued service through the applicable vesting date, provided that, if the reporting person terminates their service for any reason, then a prorated number of RSUs will vest. The RSUs have no expiration date.

4. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following August 1, 2025, subject to the reporting person's continued service through the applicable vesting date.

Remarks:

	/s/ Michael S. Turner, as Attorney-in-Fact	08/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did 908 Devices (MASS) insider Brandi C. Vann receive on 08/01/2025?

The filing reports 15,577 RSUs and a stock option for 20,409 shares with an exercise price of $5.14.

How do the RSUs granted to the insider vest?

The RSUs vest in substantially equal annual installments over 3 years beginning 08/01/2025, with prorated vesting if service terminates.

When do the stock options vest and what is the exercise price?

The options vest in substantially equal monthly installments over 36 months starting 08/01/2025 and have a $5.14 exercise price.

Was the Form 4 filed on time for the MASS insider transaction?

No. The filing states it was filed late due to an inadvertent administrative error.