908 Devices (MASS) director adds options, RSUs and lifts common share holdings

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

908 Devices Inc. director Michele M. Leonhart reported equity compensation transactions involving stock options, restricted stock units (RSUs), and common shares. On June 10, 2026, 14,083 RSUs fully vested and were converted into 14,083 shares of common stock, increasing her direct common stock holdings to 20,568 shares.

On June 11, 2026, she received a grant of 6,209 stock options with an exercise price of $8.22 per share that vest in substantially equal monthly installments over 12 months. She also received 13,656 RSUs that vest in full on June 11, 2027 or the day prior to the 2027 annual stockholders meeting, subject to continued service, with prorated vesting if service ends earlier.

Insider Trade Summary

14,083 shares exercised/converted

Mixed 4 txns

Insider Leonhart Michele M.

Role null

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	13,656	$0.00	--
Grant/Award	Stock Option (option to buy)	6,209	$0.00	--
Exercise	Restricted Stock Units	14,083	$0.00	--
Exercise	Common Stock	14,083	$0.00	--

Holdings After Transaction: Restricted Stock Units — 13,656 shares (Direct, null); Stock Option (option to buy) — 6,209 shares (Direct, null); Common Stock — 20,568 shares (Direct, null)

Footnotes (1)

Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. The RSUs became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date. The RSUs become fully vested on June 11, 2027 or the day prior to the 2027 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, 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. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following June 11, 2026, subject to the reporting person's continued service through the applicable vesting date.

Key Figures

RSUs converted: 14,083 shares Common stock held: 20,568 shares New stock options: 6,209 options +4 more

7 metrics

RSUs converted 14,083 shares RSUs vested and converted to common stock on June 10, 2026

Common stock held 20,568 shares Direct common stock ownership after transactions

New stock options 6,209 options Grant on June 11, 2026

Option exercise price $8.22 per share Exercise price for 6,209 stock options

Option expiration June 10, 2036 Expiration date of new stock options

New RSU grant 13,656 RSUs Grant on June 11, 2026

RSU vesting date June 11, 2027 Or day prior to 2027 annual meeting, whichever occurs first

Key Terms

Restricted Stock Units, Stock Option (option to buy, Annual Meeting of the Stockholders, exercise or conversion of derivative security, +1 more

5 terms

Restricted Stock Units financial

"The RSUs became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting"

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.

Stock Option (option to buy financial

"The shares underlying the option become vested and exercisable in substantially equal monthly"

Annual Meeting of the Stockholders financial

"the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc."

exercise or conversion of derivative security financial

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

grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

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Form 4 Insider Transactions: What Each Field Means →

06/12/2026 - 04:51 PM

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 THIRD 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)
06/10/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/10/2026		M		14,083	A	⁽¹⁾	20,568	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	06/10/2026		M			14,083	⁽²⁾	⁽²⁾	Common Stock	14,083	$0	0	D
Restricted Stock Units	⁽¹⁾	06/11/2026		A		13,656		⁽³⁾	⁽³⁾	Common Stock	13,656	$0	13,656	D
Stock Option (option to buy)	$8.22	06/11/2026		A		6,209		⁽⁴⁾	06/10/2036	Common Stock	6,209	$0	6,209	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 became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc. The RSUs have no expiration date.

3. The RSUs become fully vested on June 11, 2027 or the day prior to the 2027 Annual Meeting of the Stockholders of 908 Devices Inc., whichever occurs first, 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 12 months following June 11, 2026, subject to the reporting person's continued service through the applicable vesting date.

	/s/ Mark S. Levine, Attorney-in-Fact	06/12/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

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

Michele M. Leonhart reported equity awards and vesting events, including RSUs converting into common shares and new grants of stock options and RSUs. All transactions increased or created equity-based holdings as part of compensation, with no open-market stock purchases or sales reported.

How many 908 Devices (MASS) shares does Michele M. Leonhart hold after these transactions?

After the reported transactions, Michele M. Leonhart directly holds 20,568 shares of 908 Devices common stock. This total reflects 14,083 shares issued upon the vesting and conversion of RSUs on June 10, 2026, combined with her previously held common shares.

What are the terms of Michele M. Leonhart’s new stock option award at 908 Devices (MASS)?

She received 6,209 stock options with an exercise price of $8.22 per share, expiring on June 10, 2036. These options vest and become exercisable in substantially equal monthly installments over the 12 months following June 11, 2026, contingent on continued service.

How do the new RSUs granted to Michele M. Leonhart at 908 Devices (MASS) vest?

Leonhart received 13,656 RSUs that become fully vested on June 11, 2027 or the day prior to the 2027 annual stockholders meeting. Vesting requires continued service, with a prorated number vesting if service terminates earlier, and each RSU represents one share when vested.

What happened to Michele M. Leonhart’s earlier RSUs at 908 Devices (MASS)?

An earlier RSU award of 14,083 units became fully vested on June 10, 2026, the day before the 2026 annual stockholders meeting. Upon vesting, these RSUs converted into 14,083 shares of common stock, eliminating that RSU balance and increasing her direct common share ownership.