908 Devices SVP granted 26,042 performance units

Kenneweg John reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Kenneweg John reported acquisition or exercise transactions in this Form 4 filing.

908 Devices Inc. reported that SVP of Sales & Product Marketing John Kenneweg received a grant of 26,042 Performance Stock Units. Each unit represents a contingent right to receive one share of Common Stock with a par value of $0.001 when it vests.

The compensation committee certified achievement of the required performance metrics and goals on April 28, 2026, and the PSUs are scheduled to vest on May 1, 2026 in accordance with their terms. The PSUs have no expiration date, and this filing reflects a compensation-related equity award rather than an open-market trade.

Insider Trade Summary

Grant/Award: 26,042 shares

Grant/Award 1 txn

Insider Kenneweg John

Role SVP, Sales & Product Marketing

Type	Security	Shares	Price	Value
Grant/Award	Performance Stock Units	26,042	$0.00	$0.00

Holdings After Transaction: Performance Stock Units — 26,042 contracts (Direct)

Footnotes (2)

1. F1. Each performance stock unit ("PSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.
2. F2. The Issuer's compensation committee of the Board of Directors certified the achievement of the applicable performance metrics and goals on April 28, 2026. The PSUs will vest, in accordance with their terms, on May 1, 2026. The PSUs have no expiration date.

Key Figures

Performance Stock Units granted: 26,042 units Underlying Common Stock: 26,042 shares Par value per Common Share: $0.001 +2 more

5 metrics

Performance Stock Units granted 26,042 units Grant to SVP on April 28, 2026

Underlying Common Stock 26,042 shares One share per PSU upon vesting

Par value per Common Share $0.001 Common Stock underlying PSUs

Vesting date May 1, 2026 Scheduled PSU vesting date

Performance certification date April 28, 2026 Compensation committee certified goals

Key Terms

Performance Stock Units, Common Stock, par value, compensation committee

4 terms

Performance Stock Units financial

"Each performance stock unit ("PSU") represents a contingent right to receive one share"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Common Stock financial

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

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

par value financial

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

Par value is the fixed amount printed on a bond or stock that represents its original value when issued. It’s like the face value of a coin or bill—what the issuer promises to pay back or the starting price of a stock—though it often doesn’t change with market prices. It matters because it helps determine certain financial details, like how much the company will pay back at maturity.

compensation committee financial

"The Issuer's compensation committee of the Board of Directors certified the achievement"

A compensation committee is a group within a company's leadership responsible for setting and reviewing how much top executives and employees are paid, including salaries, bonuses, and benefits. It matters to investors because fair and effective pay decisions can influence a company's performance, leadership motivation, and overall governance, helping ensure that the company’s management is aligned with shareholders’ interests.

FAQ

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

What insider transaction did 908 Devices (MASS) report for John Kenneweg?

908 Devices reported that SVP John Kenneweg received 26,042 Performance Stock Units as an equity compensation award. These units are derivative securities that can convert into Common Stock, reflecting a non-cash, stock-based component of his overall compensation package.

How many Performance Stock Units did the MASS executive receive and what do they represent?

The executive received 26,042 Performance Stock Units, each representing a contingent right to one share of Common Stock. The award delivers stock only if vesting conditions are met, aligning part of his compensation with the company’s equity performance over time.

When do the awarded PSUs for 908 Devices (MASS) vest and what triggered vesting?

The PSUs are scheduled to vest on May 1, 2026, after the compensation committee certified performance results on April 28, 2026. Certification confirmed achievement of the applicable performance metrics and goals, allowing the units to follow their vesting schedule into Common Stock delivery.

Does the MASS executive’s Performance Stock Unit award have an expiration date?

The filing states that the Performance Stock Units have no expiration date. Instead of expiring, they convert into shares of Common Stock when the vesting conditions are satisfied, following certification of performance metrics and the scheduled vesting date under the award’s terms.

Is the 908 Devices (MASS) Form 4 transaction an open-market purchase or sale?

The Form 4 reflects a grant of Performance Stock Units, not an open-market purchase or sale. It is categorized as a grant or award acquisition, meaning the executive received equity-based compensation directly from the company, with no market trade involved in this transaction.

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

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Accepted by SEC EDGAR 04/29/2026 - 04:05 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^*

Kenneweg John

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Sales & Product Marketing

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/28/2026

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

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
Performance Stock Units	(1)	04/28/2026		A		26,042		(2)	(2)	Common Stock	26,042	$0	26,042	D

Explanation of Responses:

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

2. The Issuer's compensation committee of the Board of Directors certified the achievement of the applicable performance metrics and goals on April 28, 2026. The PSUs will vest, in accordance with their terms, on May 1, 2026. The PSUs have no expiration date.

	/s/ Mark S. Levine, Attorney-in-Fact	04/29/2026
	** 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)