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908 Devices (NASDAQ: MASS) director receives new options, RSUs and adds shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

908 Devices Inc. director E. Kevin Hrusovsky reported several equity compensation awards and related share movements. He received a stock option grant for 6,209 shares of Common Stock at an exercise price of $8.22 per share, vesting in substantially equal monthly installments over 12 months following June 11, 2026, and expiring on June 10, 2036.

He was also granted 13,656 Restricted Stock Units (RSUs), each representing one share of Common Stock, which become fully vested on June 11, 2027 or the day prior to the 2027 Annual Meeting of Stockholders, subject to continued service and prorated vesting on earlier termination. In addition, 14,083 RSUs became fully vested on June 10, 2026 and were converted into 14,083 shares of Common Stock, bringing his direct Common Stock holdings to 165,390 shares. A further 329,675 shares of Common Stock are held indirectly through the E. Kevin Hrusovsky 2012 Irrevocable Trust, for which his spouse and children serve as trustees and over which he may be deemed a beneficial owner.

Positive

  • None.

Negative

  • None.
Insider HRUSOVSKY E KEVIN
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 --
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Units — 13,656 shares (Direct, null); Stock Option (option to buy) — 6,209 shares (Direct, null); Common Stock — 165,390 shares (Direct, null); Common Stock — 329,675 shares (Indirect, See footnote)
Footnotes (1)
  1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. The securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust. The reporting person's spouse and children are trustees of E. Kevin Hrusovsky 2012 Irrevocable Trust and have joint voting and dispositive control with respect to all securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust and the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust. 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.
Option grant size 6,209 shares Stock Option (option to buy) granted June 11, 2026
Option exercise price $8.22 per share Exercise price of stock option expiring June 10, 2036
New RSU grant 13,656 RSUs RSUs granted June 11, 2026, vesting by June 11, 2027
Vested RSUs converted 14,083 shares RSUs vested and converted to Common Stock on June 10, 2026
Direct common shares held 165,390 shares Direct Common Stock ownership following transactions
Indirect trust holdings 329,675 shares Common Stock held by E. Kevin Hrusovsky 2012 Irrevocable Trust
Option expiration date June 10, 2036 Expiration date of 6,209-share stock option grant
Restricted Stock Unit ("RSU") financial
"Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock"
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.
Irrevocable Trust financial
"The securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust."
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
Annual Meeting of the Stockholders financial
"The RSUs became fully vested on June 10, 2026, the day prior to the 2026 Annual Meeting of the Stockholders of 908 Devices Inc."
beneficial owner financial
"the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust."
A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.
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SEC Form 4
FORM 4UNITED 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*
HRUSOVSKY E KEVIN

(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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/10/2026M14,083A(1)165,390D
Common Stock329,675ISee footnote(2)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)06/10/2026M14,083 (3) (3)Common Stock14,083$00D
Restricted Stock Units(1)06/11/2026A13,656 (4) (4)Common Stock13,656$013,656D
Stock Option (option to buy)$8.2206/11/2026A6,209 (5)06/10/2036Common Stock6,209$06,209D
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 securities are owned directly by the E. Kevin Hrusovsky 2012 Irrevocable Trust. The reporting person's spouse and children are trustees of E. Kevin Hrusovsky 2012 Irrevocable Trust and have joint voting and dispositive control with respect to all securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust and the reporting person may be deemed to be the beneficial owner of the securities held by E. Kevin Hrusovsky 2012 Irrevocable Trust.
3. 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.
4. 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.
5. 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-Fact06/12/2026
** Signature of Reporting PersonDate
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)

FAQ

What equity awards did 908 Devices (MASS) director E. Kevin Hrusovsky receive?

He received a stock option for 6,209 shares at $8.22 per share and 13,656 Restricted Stock Units. These awards are part of his director compensation and vest over time, subject to his continued service on the board.

When do E. Kevin Hrusovsky’s new RSUs in 908 Devices (MASS) vest?

The 13,656 RSUs become fully vested on June 11, 2027 or the day prior to the 2027 Annual Meeting of Stockholders. Vesting requires his continued service, with prorated vesting if his service ends before the applicable vesting date.

How many 908 Devices (MASS) shares did E. Kevin Hrusovsky acquire from RSU vesting?

On June 10, 2026, 14,083 Restricted Stock Units became fully vested and were converted into 14,083 shares of Common Stock. This conversion increased his direct share ownership without an open-market purchase or sale transaction.

What are E. Kevin Hrusovsky’s direct share holdings in 908 Devices (MASS) after these transactions?

Following the reported transactions, he holds 165,390 shares of 908 Devices Common Stock directly. These holdings reflect RSU conversions and prior ownership, and are separate from additional shares held indirectly through a family trust.

How many 908 Devices (MASS) shares are held through the E. Kevin Hrusovsky 2012 Irrevocable Trust?

The trust holds 329,675 shares of 908 Devices Common Stock. His spouse and children are trustees with joint voting and dispositive control, and he may be deemed the beneficial owner of the securities held by the trust.

What are the key terms of E. Kevin Hrusovsky’s new stock option in 908 Devices (MASS)?

The option covers 6,209 shares of Common Stock at an exercise price of $8.22 per share. It becomes vested and exercisable in substantially equal monthly installments over 12 months following June 11, 2026, and expires on June 10, 2036.