908 Devices exec plans sale of 11,459 shares

908 Devices Inc. (MASS) executive Joseph Griffith, an officer of the company, filed a Rule 144 notice to sell up to 11,459 shares of common stock through Morgan Stanley Smith Barney LLC.

Rhea-AI Filing Summary

908 Devices Inc. (MASS) executive Joseph Griffith, an officer of the company, filed a Rule 144 notice to sell up to 11,459 shares of common stock through Morgan Stanley Smith Barney LLC. The shares were acquired upon vesting of restricted stock units between February 1, 2025 and February 1, 2026. The filing also lists a prior 10b5-1 sale of 6,940 shares of common stock on May 28, 2026.

Key Figures

Shares to be sold under Rule 144: 11,459 shares Aggregate market value of planned sale: $125,132.28 Shares sold in past 3 months: 6,940 shares +2 more

5 metrics

Shares to be sold under Rule 144 11,459 shares Planned sale of 908 Devices Inc. common stock by officer Joseph Griffith

Aggregate market value of planned sale $125,132.28 Value associated with 11,459 MASS shares referenced in the notice

Shares sold in past 3 months 6,940 shares 10b5-1 sale by Joseph H. Griffith IV on May 28, 2026

Proceeds from past 3-month sale $62,668.20 Consideration for 6,940 shares of MASS common stock sold on May 28, 2026

Vesting period for RSUs February 1, 2025 through February 1, 2026 Period during which restricted stock units vested for Joseph Griffith

Key Terms

Rule 144, restricted stock units, 10b5-1

3 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.

restricted stock units financial

"The securities to be sold were acquired upon the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 regulatory

"10b5-1 Sales for JOSEPH H GRIFFITH IV"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

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

What is the purpose of the Form 144 filed in connection with MASS?

The Form 144 gives notice that officer Joseph Griffith may sell up to 11,459 shares of 908 Devices Inc. (MASS) common stock under Rule 144. The shares relate to vested restricted stock units from the period February 1, 2025 through February 1, 2026.

How many MASS shares are proposed to be sold under this Form 144?

The notice covers a proposed sale of 11,459 shares of 908 Devices Inc. (MASS) common stock. These shares are to be sold through Morgan Stanley Smith Barney LLC, with the transaction referenced under Rule 144.

What was the market value associated with the MASS shares in the planned Rule 144 sale?

The Rule 144 filing for 908 Devices Inc. (MASS) lists an aggregate market value of $125,132.28 for the 11,459 shares of common stock referenced in the planned sale as of the filing details provided.

What prior MASS stock sales by Joseph Griffith are disclosed in this Form 144?

The filing discloses a prior 10b5-1 sale by Joseph H. Griffith IV of 6,940 shares of 908 Devices Inc. (MASS) common stock on May 28, 2026, for total proceeds of $62,668.20 during the past three months.

How were the MASS shares in this Form 144 acquired by Joseph Griffith?

The notice states that the 908 Devices Inc. (MASS) shares to be sold were acquired upon the vesting of restricted stock units during the period from February 1, 2025 through February 1, 2026.

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

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Available on EDGAR 08/25/2026 - 04:29 PM EDT Accepted by SEC EDGAR 08/25/2026 - 04:29 PM EDT Learn about SEC filing dates

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	0001431531
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 Third Avenue Burlington MASSACHUSETTS 01803
Phone	8572541500
Name of Person for Whose Account the Securities are To Be Sold	Joseph Griffith
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	11459	125132.28	41333705	08/25/2026	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	02/01/2025	Restricted Stock Units	Issuer			11459	02/01/2025	N/A

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JOSEPH H GRIFFITH IV 44 Third Avenue Burlington MA 01803	Common	05/28/2026	6940	62668.20

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 2/1/2025 through 2/1/2026
Date of Notice	08/25/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/26/2026
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/ Joseph H Griffith IV
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)