[Form 4] 908 Devices Inc. Insider Trading Activity

Rhea-AI Filing Summary

908 Devices Inc. insider transaction summary Joseph H. Griffith IV, the company’s Chief Financial Officer, reported the sale of 5,000 shares of 908 Devices Inc. (ticker: MASS) on 09/19/2025 at a weighted-average price of $7.0677 per share under a pre-established Rule 10b5-1 trading plan. After the sale, the reporting person beneficially owned 97,930 shares. The filing includes an offer to provide detailed breakdowns of the separate sale prices within the $7.03–$7.14 range and is signed by an attorney-in-fact on behalf of the reporting person.

Positive

• Sale executed under a Rule 10b5-1 plan, indicating the trades were preplanned and not opportunistic
• Clear disclosure of weighted-average price ($7.0677) and price range ($7.03–$7.14), with offer to provide further breakdowns on request

Negative

• Officer sold 5,000 shares, which is a reduction in insider holdings to 97,930 shares
• Transaction could be interpreted by some investors as insider monetization, though it was preplanned

Insights

Financial Analyst

TL;DR Insider sale of 5,000 shares under a 10b5-1 plan reduced holdings to 97,930 shares; transaction appears routine and preplanned.

The CFO executed a planned sale under Rule 10b5-1, which typically signals a prearranged liquidity event rather than a reactive trade. The weighted-average sale price of $7.0677 and the disclosed price range ($7.03–$7.14) provide transparency on execution. The size of the sale (5,000 shares) relative to the remaining holdings suggests this is not a large-scale disposition that would materially affect ownership or control. For investors, the filing documents compliance and offers granular price information on request.

Corporate Governance Expert

TL;DR Use of a 10b5-1 plan and explicit price-range disclosure indicate adherence to insider trading controls and transparency.

The reporting person checked the box indicating the sales were effected pursuant to a Rule 10b5-1 trading plan, which supports an affirmative defense against insider trading allegations if the plan was established in good faith. The explanatory footnote offering to provide the number of shares sold at each price within the stated range enhances disclosure quality. This filing reflects appropriate procedural governance for officer sales, with no new governance issues disclosed.

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).

X

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^*

Griffith Joseph H. IV

(Last) (First) (Middle)

C/O 908 DEVICES INC.

44 THIRD 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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/19/2025

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	09/19/2025		S(2)		5,000	D	$7.0677(1)	97,930	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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.03 to $7.14, 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.

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

	/s/ Michael S. Turner, as Attorney-in-Fact	09/23/2025
	** 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

What did Joseph H. Griffith IV report on Form 4 for 908 Devices (MASS)?

He reported the sale of 5,000 shares on 09/19/2025 at a weighted-average price of $7.0677 under a Rule 10b5-1 plan, leaving 97,930 shares beneficially owned.

Was the sale by the MASS insider preplanned or discretionary?

The filing indicates the sale was made pursuant to a Rule 10b5-1 trading plan, which is a pre-established plan used to schedule insider trades.

What price range was disclosed for the MASS insider sale?

Prices ranged from $7.03 to $7.14, and the filing states the reporting person will provide the number of shares sold at each price on request.

How many MASS shares does the reporting person own after the transaction?

97,930 shares beneficially owned following the reported sale.

Who signed the Form 4 filing for the MASS transaction?

The form was signed by Michael S. Turner as Attorney-in-Fact on 09/23/2025.