[Form 4] 908 Devices Inc. Insider Trading Activity

Rhea-AI Filing Summary

Michael S. Turner, Chief Legal & Administrative Officer of 908 Devices (MASS), executed a series of planned stock sales under a Rule 10b5-1 trading plan over three consecutive days in June 2025:

• June 16: Sold 16,082 shares at weighted average price of $7.5139
• June 17: Sold 7,148 shares at weighted average price of $7.506
• June 18: Sold remaining 1,373 shares at $7.50

The transactions resulted in a complete liquidation of Turner's direct common stock holdings, reducing his position from 24,603 shares to zero. All sales were executed pursuant to a pre-established Rule 10b5-1 trading plan, which provides a safe harbor from insider trading allegations by determining the timing and terms of trades in advance.

Positive

• None.

Negative

• Chief Legal & Admin Officer Michael Turner completely liquidated his position, selling all 24,603 shares worth approximately $185,000 through a 10b5-1 trading plan at around $7.50 per share

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^*

Turner Michael S.

(Last) (First) (Middle)

C/O 908 DEVICES INC.

645 SUMMER STREET

(Street)

BOSTON MA 02210

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal & Admin Officer

3. Date of Earliest Transaction (Month/Day/Year)
06/16/2025

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	06/16/2025		S(1)		16,082	D	$7.5139(2)	8,521	D
Common Stock	06/17/2025		S(1)		7,148	D	$7.506(3)	1,373	D
Common Stock	06/18/2025		S(1)		1,373	D	$7.5	0.00	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

Explanation of Responses:

1. Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.50 to $7.60, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.50 to $7.54, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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.

Remarks:

	/s/ Michael S. Turner	06/18/2025
	** 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.

FAQ

How many shares of MASS stock did Michael Turner sell in June 2025?

Michael Turner, Chief Legal & Admin Officer of 908 Devices (MASS), sold a total of 24,603 shares across three transactions: 16,082 shares on June 16, 7,148 shares on June 17, and 1,373 shares on June 18, 2025. After these sales, his direct ownership was reduced to zero shares.

What was the price range of MASS stock sales by Michael Turner on June 16, 2025?

On June 16, 2025, Michael Turner sold shares at a weighted average price of $7.5139, with the actual sales occurring at prices ranging from $7.50 to $7.60 per share.

Was Michael Turner's MASS stock sale part of a planned transaction?

Yes, according to the filing, the sales were executed pursuant to a Rule 10b5-1 trading plan adopted by Michael Turner. This indicates the transactions were part of a pre-planned trading arrangement rather than spontaneous sales.

What position does Michael Turner hold at MASS (908 Devices)?

Michael Turner serves as the Chief Legal & Administrative Officer at 908 Devices Inc. (MASS).

How much MASS stock does Michael Turner own after the June 2025 transactions?

Following the series of sales completed on June 18, 2025, Michael Turner owns 0.00 shares of MASS stock directly. The filing shows he completely liquidated his direct position in the company's common stock.