908 Devices officer plans $269K stock sale

908 Devices Inc. (MASS) received a notice under Rule 144 that officer John Kenneweg plans to sell 27,656 shares of common stock, to be obtained through the exercise of stock options for cash around September 15, 2026 and over the following three months.

Available on EDGAR 09/15/2026 - 04:36 PM EDT Accepted by SEC EDGAR 09/15/2026 - 04:35 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

908 Devices Inc. (MASS) received a notice under Rule 144 that officer John Kenneweg plans to sell 27,656 shares of common stock, to be obtained through the exercise of stock options for cash around September 15, 2026 and over the following three months.

The planned sale is to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated aggregate market value of about $269,092.88 and trading on NASDAQ.

Key Figures

Shares to be sold: 27,656 shares Aggregate market value: $269,092.88 Approximate sale date: September 15, 2026 +2 more

5 metrics

Shares to be sold 27,656 shares Common stock to be sold under Rule 144 by officer John Kenneweg

Aggregate market value $269,092.88 Value associated with the 27,656 shares of common stock

Approximate sale date September 15, 2026 Approximate date of sale for the Rule 144 transaction

Shares acquired via stock option exercise 27,656 shares Securities to be sold will be received upon the exercise of stock options

Option exercise period Three months Shares were and will be received upon exercise of stock options over the next three months

Key Terms

Rule 144, Exercise of Stock Options, Common stock, Issuer

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Exercise of Stock Options financial

"Common | 09/15/2026 | Exercise of Stock Options | Issuer |"

Common stock financial

"144: Securities Information Common | Morgan Stanley Smith Barney LLC"

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.

Issuer regulatory

"Common | 09/15/2026 | Exercise of Stock Options | Issuer |"

FAQ

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

What does the Form 144 filing for MASS disclose?

It discloses that officer John Kenneweg intends to sell 27,656 shares of 908 Devices Inc. common stock under Rule 144, with the shares to be obtained via exercise of stock options for cash around September 15, 2026 and over the next three months.

How many MASS shares are covered by John Kenneweg’s planned Rule 144 sale?

The notice covers a planned sale of 27,656 shares of 908 Devices Inc. common stock. The shares will be received upon the exercise of stock options over approximately a three‑month period, with acquisition and payment dates matching the exercise and sale dates.

What is the approximate value of the MASS shares in this Form 144 notice?

The filing lists an aggregate market value of about $269,092.88 for the 27,656 shares of 908 Devices Inc. common stock to be sold in the planned Rule 144 transaction, based on information provided in the securities information section.

When are the MASS shares expected to be sold under this Rule 144 filing?

The approximate date of sale is listed as September 15, 2026. Remarks state that the securities were and will be received upon stock option exercises over the next three months, with acquisition and payment dates matching the exercise and sale dates.

Through which broker will the MASS Rule 144 sale be executed?

The planned sale is associated with Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as shown in the securities information section of the Form 144 notice.

On which market are the MASS shares in this Form 144 expected to trade?

The common shares referenced in the notice are indicated for trading on NASDAQ, according to the securities information section associated with the planned Rule 144 sale of 27,656 shares.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001836876
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	908 Devices Inc.
SEC File Number	001-39815
Address of Issuer	44 3rd Avenue Burlington MASSACHUSETTS 01803
Phone	8572541500
Name of Person for Whose Account the Securities are To Be Sold	John Kenneweg
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	27656	269092.88	41333705	09/15/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/15/2026	Exercise of Stock Options	Issuer			27656	09/15/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/12/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ John Kenneweg
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)