MASS holder files to sell 140,000 common shares

A shareholder of MASS filed a notice to sell 140,000 shares of common stock through Merrill Lynch, with an indicated aggregate market value of $1,347,000.

Rhea-AI Filing Summary

A shareholder of MASS filed a notice to sell 140,000 shares of common stock through Merrill Lynch, with an indicated aggregate market value of $1,347,000. The filing lists 37,813,621 common shares outstanding and contemplates sales beginning on August 11, 2026 on NASDAQ.

The form identifies the securities as Founder Shares originally acquired from the issuer for cash on February 10, 2012. It also discloses prior open-market sales by Kevin Knopp over the past three months, including multiple transactions between June 23 and August 10, 2026.

Key Figures

Shares to be sold: 140,000 shares Aggregate market value: $1,347,000 Shares outstanding: 37,813,621 shares +3 more

6 metrics

Shares to be sold 140,000 shares Common stock proposed for sale under Rule 144

Aggregate market value $1,347,000 Market value of 140,000 shares to be sold

Shares outstanding 37,813,621 shares Common shares outstanding cited in the notice

Proposed sale start date 08/11/2026 Date from which Rule 144 sales may occur

Sale 06/24/2026 40,535 shares for 368,425 Kevin Knopp’s reported sale on June 24, 2026

Sale 06/25/2026 16,388 shares for 148,308 Kevin Knopp’s reported sale on June 25, 2026

Key Terms

Founder Shares, Securities To Be Sold, Securities Sold During The Past 3 Months

3 terms

Founder Shares financial

"Common | 02/10/2012 | Founder Shares | Issuer"

Founder shares are the ownership stakes given to the people who start a company, often with extra voting power or protections compared with ordinary shares. For investors, they matter because founders’ control and incentives influence decisions about strategy, hiring, and whether the company sells or stays independent — like a family that keeps majority voting rights in a household decision. High founder ownership can mean stable leadership but also a risk that outside shareholders have less influence.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What does the MASS shareholder’s Form 144 filing disclose?

The Form 144 for MASS discloses a proposed sale of 140,000 common shares through Merrill Lynch, with an aggregate market value of $1,347,000, and describes these securities as Founder Shares originally acquired for cash.

How many MASS shares are outstanding in this Form 144 filing?

The filing states that 37,813,621 MASS common shares were outstanding. This figure provides context for the proposed sale of 140,000 shares under Rule 144, showing the relative size of the planned disposition.

When may the MASS Rule 144 sale begin according to the filing?

The notice indicates that sales of MASS common stock may begin on August 11, 2026. This date marks the start of the period during which the filer may sell the 140,000 shares described in the Form 144 submission.

Who is named in the recent MASS share sales section of the Form 144?

The section on recent transactions lists Kevin Knopp as selling MASS common shares on several dates. Disclosed transactions include sales on June 23, 24, 25, 26, July 2, and August 10, 2026, each with specific share and value amounts.

What recent MASS share sale amounts are reported for Kevin Knopp?

Reported transactions by Kevin Knopp include sales such as 40,535 shares for $368,425 on June 24, 2026, and 16,388 shares for $148,308 on June 25, 2026, along with several smaller trades in June, July, and August 2026.

How were the MASS founder shares originally acquired?

The Form 144 notes that the Founder Shares being proposed for sale were acquired from the issuer on February 10, 2012 for cash. This acquisition history is part of the background information required in the Rule 144 notice.

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

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Accepted by SEC EDGAR 08/11/2026 - 03:13 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	0001836523
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
Address of Issuer	44 Third Avenue Burlington MASSACHUSETTS 01803
Phone	8572541500
Name of Person for Whose Account the Securities are To Be Sold	Kevin Knopp
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	Merrill Lynch 100 Federal Street, 12th Fl Boston MA 02110	140000	1347000	37813621	08/11/2026	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	02/10/2012	Founder Shares	Issuer			140000	02/10/2012	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	06/23/2026	3422	30845
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	06/24/2026	40535	368425
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	06/25/2026	16388	148308
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	06/26/2026	2798	25288
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	07/02/2026	222	1938
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	08/10/2026	348	3078

144: Remarks and Signature

Remarks
Date of Notice	08/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/20/2025
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	Kevin Knopp
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)