908 Devices founder plans sale of 20,000 shares

Kevin Knopp has filed a Form 144 indicating an intent to sell up to 20,000 shares of MASS common stock through Merrill Lynch on NASDAQ.

Rhea-AI Filing Summary

Kevin Knopp has filed a Form 144 indicating an intent to sell up to 20,000 shares of MASS common stock through Merrill Lynch on NASDAQ. These shares are identified as Founder Shares acquired from the issuer for cash on 02/10/2012. The filing notes that MASS had 37,813,621 common shares outstanding as of 08/17/2026 and that Knopp has sold multiple small common stock blocks in the open market over the past three months.

Key Figures

Shares to be sold under Form 144: 20,000 shares Approximate value of shares to be sold: 205,000 Shares outstanding: 37,813,621 shares +3 more

6 metrics

Shares to be sold under Form 144 20,000 shares Proposed sale of MASS common stock through Merrill Lynch on NASDAQ

Approximate value of shares to be sold 205,000 Figure listed alongside 20,000 shares of MASS common stock

Shares outstanding 37,813,621 shares MASS common shares outstanding as of 08/17/2026

Acquisition date of founder shares 02/10/2012 Date the founder shares covered by the Form 144 were acquired for cash

Largest recent single sale by Knopp 145,918 shares Common stock sale on 08/11/2026 with total amount 1,436,466

Recent sale example 3,422 shares Common stock sale on 06/23/2026 with total amount 30,845

Key Terms

Form 144, Founder Shares, Securities To Be Sold, Securities Sold During The Past 3 Months

4 terms

Form 144 regulatory

"144: Securities Information Common | Merrill Lynch..."

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

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 Common | 02/10/2012..."

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months Kevin Knopp..."

FAQ

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

What does MASS's Form 144 filed by Kevin Knopp disclose?

The Form 144 discloses Kevin Knopp’s intention to sell up to 20,000 shares of MASS common stock. The shares are founder shares acquired for cash on 02/10/2012, with sales expected to be executed through Merrill Lynch on NASDAQ.

How many MASS (MASS) shares does the Form 144 register for potential sale?

The Form 144 covers a planned sale of up to 20,000 shares of MASS common stock. This is a notice of proposed sales under Rule 144, not a confirmation that all shares will necessarily be sold.

What is the reported share count outstanding for MASS in this Form 144?

The filing states that MASS had 37,813,621 common shares outstanding as of 08/17/2026. This figure provides context for the 20,000 shares proposed for sale in relation to the company’s total equity base.

When were the MASS founder shares in this Form 144 originally acquired?

The shares covered by the Form 144 are labeled as Founder Shares acquired from the issuer on 02/10/2012 for cash. This indicates the holdings originate from an early-stage equity position rather than recent market purchases.

What recent MASS (MASS) stock sale activity by Kevin Knopp is listed?

The filing lists several open-market sales of MASS common stock by Kevin Knopp between 06/23/2026 and 08/13/2026. Individual transactions range from hundreds to over 145,000 shares, each with corresponding total dollar amounts.

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

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Available on EDGAR 08/17/2026 - 02:19 PM Accepted by SEC EDGAR 08/17/2026 - 02:18 PM 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	20000	205000	37813621	08/17/2026	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			20000	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
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	08/11/2026	145918	1436466
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	08/12/2026	2747	27532
Kevin Knopp 100 Federal Street, 12th Fl Boston MA 02110	Common	08/13/2026	7622	76294

144: Remarks and Signature

Remarks
Date of Notice	08/17/2026
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)