908 Devices (MASS) CEO awarded RSUs, options and sells shares for taxes

Rhea-AI Filing Summary

908 Devices Inc. President and CEO Kevin J. Knopp reported equity compensation activity and a tax-related share sale. On February 1, 2026, several Restricted Stock Units vested and were settled for 11,255, 13,449, 17,007, and 66,288 shares of common stock, increasing his direct holdings to 830,732 shares.

On February 2, 2026, Knopp sold 34,764 shares of common stock at a weighted average price of $6.18 solely to cover tax withholding from the RSU vesting, leaving 795,968 shares held directly. He also received 205,978 new RSUs and a stock option for 90,043 shares at a $6.19 exercise price, which begin vesting on February 1, 2027. Separately, 541,223 shares are held indirectly by The Kevin J. Knopp Irrevocable Trust of 2018, for which his brother-in-law serves as trustee with sole voting and dispositive control.

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

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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^*

Knopp Kevin J.

(Last) (First) (Middle)

C/O 908 DEVICES INC

44 3RD 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
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/01/2026

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
Common Stock	02/01/2026		M		11,255	A	(1)	733,988	D
Common Stock	02/01/2026		M		13,449	A	(1)	747,437	D
Common Stock	02/01/2026		M		17,007	A	(1)	764,444	D
Common Stock	02/01/2026		M		66,288	A	(1)	830,732	D
Common Stock	02/02/2026		S(2)		34,764	D	$6.18(3)	795,968	D
Common Stock								541,223	I	See footnote(4)

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)	02/01/2026		M			11,255	(5)	(5)	Common Stock	11,255	$0	0	D
Restricted Stock Units	(1)	02/01/2026		M			13,449	(6)	(6)	Common Stock	13,449	$0	13,448	D
Restricted Stock Units	(1)	02/01/2026		M			17,007	(7)	(7)	Common Stock	17,007	$0	34,014	D
Restricted Stock Units	(1)	02/01/2026		M			66,288	(8)	(8)	Common Stock	66,288	$0	132,576	D
Restricted Stock Units	(1)	02/02/2026		A		205,978		(9)	(9)	Common Stock	205,978	$0	205,978	D
Stock Option (option to buy)	$6.19	02/02/2026		A		90,043		(10)	02/01/2036	Common Stock	90,043	$0	90,043	D

Explanation of Responses:

1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive, at settlement, one share of Common Stock. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

2. The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.105 to $6.32, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

4. The shares are owned directly by The Kevin J. Knopp Irrevocable Trust of 2018. The reporting person's brother-in-law is the trustee of The Kevin J. Knopp Irrevocable Trust of 2018 and has sole voting and dispositive control with respect to all securities held by such trust. The reporting person may be deemed to be the beneficial owner of the securities held by The Kevin J. Knopp Irrevocable Trust of 2018.

5. These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

6. These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

7. These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

8. The RSUs shall vest one-third on February 1, 2026, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

9. The RSUs shall vest one-third on February 1, 2027, with the remaining two-thirds vesting in two substantially equal annual installments at the two anniversary dates following February 1, 2027, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

10. One-third of the shares underlying the option become vested and exercisable on February 1, 2027, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following February 1, 2027, subject to the reporting person's continued service through the applicable vesting date.

	/s/ Mark S. Levine, Attorney-in-Fact	02/03/2026
	** 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).
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FAQ

What did 908 Devices (MASS) CEO Kevin Knopp report in this Form 4 filing?

Kevin Knopp reported RSU vesting, a tax-related sale, and new equity awards. Several RSU grants converted into common stock, some shares were sold to cover withholding taxes, and he received additional RSUs and a stock option that vest over future years.

How many 908 Devices (MASS) shares did the CEO sell, and at what price?

Kevin Knopp sold 34,764 shares of 908 Devices common stock at a weighted average price of $6.18 per share. According to the filing, this sale was made solely to cover tax withholding obligations related to vested Restricted Stock Units, not as a discretionary sale.

What new equity awards did 908 Devices (MASS) grant to its CEO?

The CEO received 205,978 new Restricted Stock Units and a stock option covering 90,043 shares at a $6.19 exercise price. The RSUs and option begin vesting on February 1, 2027, with remaining portions vesting over the following two years, subject to continued service.

How many 908 Devices (MASS) shares does the CEO hold directly after these transactions?

After the reported transactions, Kevin Knopp directly holds 795,968 shares of 908 Devices common stock. This reflects RSU settlements into shares on February 1, 2026, followed by a February 2, 2026 sale of 34,764 shares to satisfy tax withholding obligations from the vesting.

What indirect ownership does the 908 Devices (MASS) CEO have through a trust?

The filing shows 541,223 shares of 908 Devices common stock held indirectly by The Kevin J. Knopp Irrevocable Trust of 2018. Knopp’s brother-in-law is trustee with sole voting and dispositive control, and Knopp may be deemed a beneficial owner of those trust-held securities.

How do the CEO’s Restricted Stock Units in 908 Devices (MASS) vest over time?

Certain RSU grants vest in four equal annual installments following grant dates in 2022, 2023, and 2024. New RSUs granted in 2026 and 2027 vest one-third on February 1, 2026 or 2027, with the remaining two-thirds vesting in two equal annual installments, subject to continued service.