908 Devices director sells 100 shares under plan

908 Devices Inc. director Christopher D. Brown reported an open-market sale of 100 shares of Common Stock at $9.00 per share on June 4, 2026.

Rhea-AI Filing Summary

908 Devices Inc. director Christopher D. Brown reported an open-market sale of 100 shares of Common Stock at $9.00 per share on June 4, 2026. After this transaction, he directly holds 875,459 shares. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 24, 2025.

Insider Trade Summary 10b5-1

Net Seller: 100 shares

Net Sell 1 txn

Insider Brown Christopher D.

Role Director

Sold 100 shs ($900.00)

Type	Security	Shares	Price	Value
Sale	Common Stock	100	$9.00	$900.00

Holdings After Transaction: Common Stock — 875,459 shares (Direct)

Footnotes (1)

1. F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 24, 2025.

Key Figures

Shares sold: 100 shares Sale price: $9.00 per share Shares held after transaction: 875,459 shares +1 more

4 metrics

Shares sold 100 shares Open-market sale on June 4, 2026

Sale price $9.00 per share Price for Common Stock in reported sale

Shares held after transaction 875,459 shares Direct ownership after June 4, 2026 sale

Trading plan adoption date November 24, 2025 Rule 10b5-1 plan governing the sale

Key Terms

Rule 10b5-1 trading plan, open-market sale, Form 4, Common Stock

4 terms

Rule 10b5-1 trading plan regulatory

"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.

open-market sale financial

"transaction_action": "open-market sale""

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.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Common Stock financial

"security_title": "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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did 908 Devices (MASS) report in this Form 4?

908 Devices reported that director Christopher D. Brown sold 100 shares of Common Stock in an open-market transaction. The sale occurred on June 4, 2026 at a reported price of $9.00 per share, according to the Form 4 details.

How many 908 Devices (MASS) shares did Christopher D. Brown sell and at what price?

Christopher D. Brown sold 100 shares of 908 Devices Common Stock at $9.00 per share. This open-market sale was disclosed in a Form 4 filing and reflects a small transaction relative to his reported total holdings.

What are Christopher D. Brown’s holdings in 908 Devices (MASS) after the reported sale?

Following the sale, Christopher D. Brown directly holds 875,459 shares of 908 Devices Common Stock. This post-transaction figure is reported in the Form 4 and shows that he retains a substantial equity position in the company.

Was the 908 Devices (MASS) insider sale made under a Rule 10b5-1 plan?

Yes. The Form 4 footnote states the transaction was made pursuant to a Rule 10b5-1 trading plan adopted on November 24, 2025. Such pre-arranged plans automate trades and can reduce the informational value of transaction timing.

Who is the insider involved in the recent 908 Devices (MASS) Form 4 filing?

The insider is Christopher D. Brown, identified in the filing as a director of 908 Devices Inc. He reported an open-market sale of 100 shares of Common Stock while continuing to hold 875,459 shares directly after the transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/05/2026 - 06:49 PM EDT 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^*

Brown Christopher D.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

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	06/04/2026		S(1)		100	D	$9	875,459	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 November 24, 2025.

	/s/ Mark S. Levine, Attorney-in-Fact	06/05/2026
	** 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)