908 Devices director exercises 6,486 RSUs

908 Devices Inc. director Michele M. Leonhart exercised restricted stock units into common shares as part of equity compensation.

Rhea-AI Filing Summary

908 Devices Inc. director Michele M. Leonhart exercised restricted stock units into common shares as part of equity compensation. She acquired 6,486 shares of common stock through the conversion of 6,486 restricted stock units at a stated price of $0.00 per share.

Following the transaction, Leonhart directly holds 27,054 shares of common stock. The restricted stock units underlying this exercise vest in substantially equal annual installments over three years starting June 25, 2024, with prorated vesting if service ends earlier, and represent the right to receive one share of common stock per unit when vested.

Insider Trade Summary

6,486 shares exercised/converted

Exercise 2 txns

Insider Leonhart Michele M.

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	6,486	$0.00	$0.00
Exercise	Common Stock	6,486	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 6,485 contracts (Direct); Common Stock — 27,054 shares (Direct)

Footnotes (2)

1. F1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
2. F2. The RSUs become vested in substantially equal annual installments over the 3 years following June 25, 2024, 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.

Key Figures

RSUs exercised: 6,486 units Common shares acquired: 6,486 shares Post-transaction holdings: 27,054 shares +3 more

6 metrics

RSUs exercised 6,486 units Restricted stock units converted into common stock

Common shares acquired 6,486 shares Shares received from RSU exercise

Post-transaction holdings 27,054 shares Common stock held directly after transaction

RSU vesting period 3 years Annual installments following June 25, 2024

RSU to share ratio 1:1 Each RSU represents one share of common stock when vested

Exercise price $0.00 per share Stated price for RSU conversion into common stock

Key Terms

Restricted Stock Units, contingent right, vested, derivative security, +1 more

5 terms

Restricted Stock Units financial

"Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"represents a contingent right to receive one share of Common Stock"

vested financial

"receive one share of Common Stock, par value $0.001, when vested"

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

substantially equal annual installments financial

"The RSUs become vested in substantially equal annual installments over the 3 years"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did 908 Devices (MASS) report for Michele M. Leonhart?

908 Devices reported that director Michele M. Leonhart exercised 6,486 restricted stock units into 6,486 shares of common stock. This reflects routine equity compensation vesting rather than an open-market purchase or sale, and was recorded at a stated price of $0.00 per share.

How many 908 Devices (MASS) shares does Michele M. Leonhart hold after this Form 4?

After the reported transaction, Michele M. Leonhart directly holds 27,054 shares of 908 Devices common stock. This total reflects the addition of 6,486 shares received from the exercise of restricted stock units as part of her ongoing director compensation package.

What are the terms of the 908 Devices (MASS) restricted stock units in this filing?

Each restricted stock unit represents a contingent right to receive one share of 908 Devices common stock when vested. The units vest in substantially equal annual installments over three years starting June 25, 2024, subject to continued service, with prorated vesting if service terminates earlier.

Over what period do Michele M. Leonhart’s 908 Devices RSUs vest?

Her restricted stock units vest in substantially equal annual installments over the three years following June 25, 2024. Vesting is conditioned on continued service, but if her service ends, a prorated number of units will still vest under the disclosed terms.

Was the Michele M. Leonhart Form 4 a market buy or sell of MASS shares?

The Form 4 does not report any open-market buy or sell of MASS shares. Instead, it records the exercise or conversion of 6,486 restricted stock units into common stock at $0.00 per share as part of her equity compensation arrangements.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/25/2026 - 04:15 PM EDT Learn about SEC filing dates

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
Estimated average burden
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^*

Leonhart Michele M.

(Last) (First) (Middle)

C/O 908 DEVICES INC.

44 3RD AVENUE

(Street)

BURLINGTON MASSACHUSETTS 01803

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/25/2026

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

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

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

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
Common Stock	06/25/2026		M		6,486	A	(1)	27,054	D

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 Units	(1)	06/25/2026		M			6,486	(2)	(2)	Common Stock	6,486	$0	6,485	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. The RSUs become vested in substantially equal annual installments over the 3 years following June 25, 2024, 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.

	/s/ Mark S. Levine, Attorney-in-Fact	06/25/2026
	** 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.
* Form 4: SEC 1474 (03-26)