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908 Devices Inc. (MASS) director sells 20,000 shares under trading plan

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

908 Devices Inc. director Christopher D. Brown reported selling 20,000 shares of common stock on August 5, 2026 at a weighted average price of $8.49 per share, with trade prices ranging from $8.35 to $8.595. The sale was made pursuant to a Rule 10b5-1 trading plan adopted on November 24, 2025 and left Brown with 823,359 shares of common stock held directly.

Positive

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Negative

  • None.
Insider Brown Christopher D.
Role Director
Sold 20,000 shs ($170K)
Type Security Shares Price Value
Sale Common Stock F1, F2 20,000 $8.49 $170K
Holdings After Transaction: Common Stock — 823,359 shares (Direct)
Footnotes (2)
  1. F1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 24, 2025.
  2. F2. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.35 to $8.595 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.
Shares sold 20,000 shares Common Stock sold by director Christopher D. Brown on August 5, 2026
Weighted average sale price $8.49 per share Weighted average price for the 20,000 shares sold
Sale price range $8.35 to $8.595 per share Range of prices for multiple sale transactions on August 5, 2026
Shares held after transaction 823,359 shares Common Stock directly owned by Christopher D. Brown following the sale
10b5-1 plan adoption date November 24, 2025 Date Brown adopted the Rule 10b5-1 trading plan used for this sale
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 is a weighted average price. These shares were sold"
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.
Form 4 regulatory
"Christopher D. Brown reported the transaction on a Form 4 insider filing"
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.

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

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FAQ

What insider transaction did 908 Devices (MASS) report for Christopher D. Brown?
908 Devices reported that director Christopher D. Brown sold 20,000 shares of common stock on August 5, 2026 at a weighted average price of $8.49 per share, in a transaction reported on a Form 4.

How many 908 Devices (MASS) shares did Christopher D. Brown retain after the sale?
After the reported sale, Christopher D. Brown directly held 823,359 shares of 908 Devices common stock. This post-transaction holding reflects his remaining direct ownership following the 20,000-share disposition on August 5, 2026.

At what prices were the 908 Devices (MASS) shares sold by Christopher D. Brown?
The reported weighted average sale price was $8.49 per share. According to the disclosure, the 20,000 shares were sold in multiple transactions at prices ranging from $8.35 to $8.595 per share, inclusive.

Was the 908 Devices (MASS) share sale by Christopher D. Brown under a Rule 10b5-1 plan?
Yes. The sale was made pursuant to a Rule 10b5-1 trading plan adopted by Christopher D. Brown on November 24, 2025. Such plans pre-arrange trading parameters, reducing the informational value of trade timing.

What type of security did Christopher D. Brown trade in 908 Devices (MASS)?
Christopher D. Brown traded Common Stock of 908 Devices Inc. The Form 4 reports the sale of 20,000 shares of common stock on August 5, 2026, leaving him with 823,359 shares directly owned afterward.
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/05/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/05/2026S(1)20,000D$8.49(2)823,359D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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.
2. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.35 to $8.595 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-Fact08/07/2026
** Signature of Reporting PersonDate
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