908 Devices (MASS) SVP sells 18,255 shares in open-market trade

Rhea-AI Filing Summary

908 Devices Inc. senior vice president of sales and product marketing John Kenneweg sold 18,255 shares of Common Stock in an open-market transaction on May 8, 2026 at a weighted average price of $8.11 per share. The sales occurred at prices ranging from $7.99 to $8.20. After these transactions, he directly owns 57,784 shares of 908 Devices Common Stock.

Insider Trade Summary

Net Seller: 18,255 shares ($148,048)

Net Sell 1 txn

Insider Kenneweg John

Role SVP, Sales & Product Marketing

Sold 18,255 shs ($148K)

Type	Security	Shares	Price	Value
Sale	Common Stock	18,255	$8.11	$148K

Holdings After Transaction: Common Stock — 57,784 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 18,255 shares Weighted average sale price: $8.11 per share Remaining holdings: 57,784 shares +1 more

4 metrics

Shares sold 18,255 shares Open-market sale of Common Stock on May 8, 2026

Weighted average sale price $8.11 per share Average across multiple trades from $7.99 to $8.20

Remaining holdings 57,784 shares Directly owned after the reported transaction

Net shares sold 18,255 shares Net change in buy/sell activity in this Form 4

Key Terms

open-market sale, weighted average price, Common Stock, transaction code "S"

4 terms

open-market sale financial

"transaction_action is described as an open-market sale of Common Stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

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.

Common Stock financial

"The transaction involved 18,255 shares of Common Stock."

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.

transaction code "S" regulatory

"The filing uses transaction code "S" for a sale in open market."

Form 4 Insider Transactions: What Each Field Means →

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)
05/08/2026

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	05/08/2026		S		18,255	D	$8.11(1)	57,784	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 $7.99 to $8.20 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the 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 range set forth in this footnote.

	/s/ Mark S. Levine, Attorney-in-Fact	05/11/2026
	** 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)

FAQ

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

908 Devices reported that SVP John Kenneweg sold 18,255 shares of Common Stock. The Form 4 shows this was an open-market transaction, reducing his direct holdings but leaving him with a substantial remaining position of 57,784 shares after the sale.

At what price did John Kenneweg sell 908 Devices (MASS) shares?

John Kenneweg sold his 908 Devices shares at a weighted average price of $8.11 per share. The filing notes multiple individual trades executed between $7.99 and $8.20, with the average price reflecting this full range of sale prices.

How many 908 Devices (MASS) shares does John Kenneweg hold after the sale?

After the reported sale, John Kenneweg holds 57,784 shares of 908 Devices Common Stock directly. This figure, disclosed in the Form 4, represents his remaining stake following the 18,255 shares sold in the open-market transaction on May 8, 2026.

Was the 908 Devices (MASS) insider transaction an open-market sale?

Yes. The Form 4 classifies the transaction as an open-market sale of Common Stock. It uses transaction code “S,” indicating sales in the open market or private transactions, with 18,255 shares sold across multiple trades within the specified price range.

Does the 908 Devices (MASS) Form 4 mention a price range for the sale?

Yes. The Form 4 footnote explains that the 18,255 shares were sold at prices ranging from $7.99 to $8.20. The disclosed price of $8.11 per share is a weighted average across all individual trades executed within this range.