908 Devices CFO sells 11,459 shares at $10.95

Rhea-AI Filing Summary

908 Devices Inc. (MASS) reported that Chief Financial Officer Joseph H. Griffith IV sold 11,459 shares of common stock on August 25, 2026 in an open-market or private transaction. The weighted-average sale price was approximately $10.95 per share, with execution prices ranging from $10.65 to $11.03. Following this sale, Griffith directly holds 121,497 shares of 908 Devices Inc. common stock. The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 26, 2026.

Insider Trade Summary 10b5-1

Net Seller: 11,459 shares

Net Sell 1 txn

Insider Griffith Joseph H. IV

Role Chief Financial Officer

Sold 11,459 shs ($125K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	11,459	$10.95	$125K

Holdings After Transaction: Common Stock — 121,497 shares (Direct)

Footnotes (2)

1. F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 26, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.65 to $11.03, 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.

Key Figures

Shares sold: 11,459 shares of Common Stock Weighted average sale price: $10.95 per share Sale price range: $10.65 to $11.03 per share +2 more

5 metrics

Shares sold 11,459 shares of Common Stock Sale by CFO Joseph H. Griffith IV on August 25, 2026

Weighted average sale price $10.95 per share Weighted average price for the 11,459 shares sold

Sale price range $10.65 to $11.03 per share Range of prices for multiple sale transactions on August 25, 2026

Shares owned after transaction 121,497 shares Direct holdings of CFO following the reported sale

Rule 10b5-1 plan adoption date May 26, 2026 Date CFO adopted the trading plan governing this sale

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"transaction code S, described as a Sale in open market or private transaction"

FAQ

What insider transaction did MASS report for Joseph H. Griffith IV?

MASS reported that Chief Financial Officer Joseph H. Griffith IV sold 11,459 shares of 908 Devices Inc. common stock on August 25, 2026 under transaction code S, described as a sale in an open market or private transaction.

At what price were the 11,459 MASS shares sold by the CFO?

The CFO’s 11,459 shares of MASS were sold at a weighted average price of $10.95 per share. The filing states the shares were sold in multiple transactions at prices ranging from $10.65 to $11.03 per share, inclusive.

How many MASS shares does the CFO hold after this reported sale?

After the reported sale, Chief Financial Officer Joseph H. Griffith IV directly holds 121,497 shares of 908 Devices Inc. common stock, as reported in the post-transaction holdings column.

Was the MASS CFO’s sale made under a Rule 10b5-1 trading plan?

Yes. The filing states the transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 26, 2026, and the document-level Rule 10b5-1 checkbox is affirmed.

What does the Form 4 say about the price range for the MASS share sale?

The Form 4 notes that the reported price is a weighted average. The 11,459 shares were sold in multiple transactions at prices ranging from $10.65 to $11.03 per share, inclusive, and detailed trade information is available on request.

Is this MASS Form 4 transaction a buy or a sell by the insider?

This Form 4 reports a sale of common stock by the insider. The transaction uses code S (sale in open market or private transaction) with an acquired/disposed code of D, and the summarized direction is a net-sell of 11,459 shares.

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Available on EDGAR 08/27/2026 - 04:55 PM Accepted by SEC EDGAR 08/27/2026 - 04:55 PM 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).

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 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)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/25/2026

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
Common Stock	08/25/2026		S(1)		11,459	D	$10.95(2)	121,497	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. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 26, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.65 to $11.03, 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.

	/s/ Mark S. Levine, Attorney-in-Fact	08/27/2026
	** 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)