Was the 908 Devices (MASS) CFO’s share sale made under a Rule 10b5-1 plan?

Yes, the CFO’s sale was executed under a Rule 10b5-1 trading plan. The footnote explains the transaction was made pursuant to a pre-arranged plan, indicating the timing was set in advance rather than decided at the moment of sale.

What price did the 908 Devices (MASS) CFO receive per share in the sale?

The CFO sold his 908 Devices shares at $9.03 per share. This was the reported transaction price for the 6,940 shares of Common Stock sold in the open market, as disclosed in the Form 4 filing.

908 Devices CFO sells 6,940 shares at $9.03

908 Devices Inc. Chief Financial Officer Joseph H. Griffith IV sold 6,940 shares of Common Stock in an open-market transaction at a price of $9.03 per share on May 28, 2026.

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Filing Sentiment

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Form Type

Rhea-AI Filing Summary

908 Devices Inc. Chief Financial Officer Joseph H. Griffith IV sold 6,940 shares of Common Stock in an open-market transaction at a price of $9.03 per share on May 28, 2026.

After this sale, he continues to hold 132,956 shares directly. The filing notes that the transaction was carried out under a pre-arranged Rule 10b5-1 trading plan, indicating the sale was scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 6,940 shares

Net Sell 1 txn

Insider Griffith Joseph H. IV

Role Chief Financial Officer

Sold 6,940 shs ($63K)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,940	$9.03	$63K

Holdings After Transaction: Common Stock — 132,956 shares (Direct)

Footnotes (1)

F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 2, 2025.

Key Figures

Shares sold: 6,940 shares Sale price: $9.03 per share Shares held after sale: 132,956 shares +1 more

4 metrics

Shares sold 6,940 shares Open-market sale of Common Stock on May 28, 2026

Sale price $9.03 per share Price for the 6,940 shares sold

Shares held after sale 132,956 shares Direct Common Stock holdings following the transaction

Transactions reported 1 sale Single non-derivative open-market sale in this Form 4

Key Terms

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

4 terms

Rule 10b5-1 trading plan regulatory

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

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.

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.

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.

FAQ

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

What insider transaction did 908 Devices (MASS) report for its CFO?

908 Devices reported that CFO Joseph H. Griffith IV sold 6,940 shares. The shares of Common Stock were sold in an open-market transaction at $9.03 per share, and he retained 132,956 shares directly after the transaction.

How many 908 Devices (MASS) shares does the CFO hold after this Form 4 sale?

After the reported sale, the CFO directly holds 132,956 shares. This figure reflects his remaining Common Stock position following the 6,940-share open-market sale disclosed in the Form 4 insider transaction report.

Does the 908 Devices (MASS) Form 4 show any option exercises or derivative trades?

No derivative or option exercises are reported in this Form 4. The filing shows only a single non-derivative transaction: an open-market sale of 6,940 shares of Common Stock, with no remaining derivative positions listed in the derivative summary.

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

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Accepted by SEC EDGAR 05/29/2026 - 04:15 PM EDT

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^*

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)
05/28/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/28/2026		S⁽¹⁾		6,940	D	$9.03	132,956	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 2, 2025.

	/s/ Mark S. Levine, Attorney-in-Fact	05/29/2026
	** 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)

Source: View Original Filing on SEC EDGAR