MASS files Form 144 to sell 70,000 shares

MASS filed a Form 144 to sell 70,000 shares of Common Stock.

Rhea-AI Filing Summary

MASS filed a Form 144 to sell 70,000 shares of Common Stock.

The notice lists multiple 10b5-1 sales by Christopher Brown: 30,000 shares on 05/28/2026 for $270,000, 20,000 shares on 05/06/2026 for $144,668, and earlier April sales totaling additional shares and proceeds.

Insights

Securities Compliance Specialist

Rule 144 notice documents planned/responsive resale via 10b5-1 sale arrangements.

The filing shows a 70,000-share Form 144 notice and multiple 10b5-1 dispositions by Christopher Brown, with dated trades in April and May 2026. This is a routine regulatory notice required for certain restricted or control stock sales.

Cash‑flow treatment and any lockup/holding-period qualifiers are not shown in the excerpt; subsequent filings may provide further detail on remaining holdings or wash‑sale timing.

Key Figures

Registered/offered amount: 70,000 shares Sale on 05/28/2026: 30,000 shares Sale on 05/06/2026: 20,000 shares +3 more

6 metrics

Registered/offered amount 70,000 shares Form 144 notice

Sale on 05/28/2026 30,000 shares Proceeds listed as $270,000

Sale on 05/06/2026 20,000 shares Proceeds listed as $144,668

Sale on 04/10/2026 17,578 shares Proceeds listed as $124,192.11

Sale on 04/09/2026 7,392 shares Proceeds listed as $52,019.36

Sale on 04/08/2026 15,030 shares Proceeds listed as $105,960.75

Key Terms

10b5-1, Form 144, Founders Shares

3 terms

10b5-1 regulatory

"10b5-1 Sales for CHRISTOPHER BROWN 44 Third Avenue Burlington"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

Founders Shares financial

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

Founders shares are a special block of a company’s stock originally given to the people who started the business; they often carry extra voting power or favorable terms compared with regular shares. For investors, these shares matter because they concentrate control and influence how future funding, ownership dilution, and decision-making will play out—think of founders shares as the steering wheel that can steer a company’s direction even as more passengers (investors) climb aboard.

FAQ

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

What does MASS's Form 144 for 70,000 shares mean?

It notifies the SEC of an intended/claimed resale of 70,000 shares. The filing lists 10b5-1 sales by Christopher Brown, with specific sale dates and dollar amounts in April and May 2026.

Who executed the 10b5-1 sales listed in the MASS Form 144?

The sales were executed by Christopher Brown under 10b5-1 plans. The excerpt lists multiple transactions dated in April and May 2026 with share counts and proceeds.

How many shares were sold on 05/28/2026 according to the filing?

The filing shows 30,000 shares sold on 05/28/2026 for $270,000. This is one of several 10b5-1 transactions reported in the past three months.

What were the proceeds reported for the 05/06/2026 sale in the filing?

The excerpt reports proceeds of $144,668 for a 20,000-share sale on 05/06/2026. The filing includes additional April sales with their respective proceeds.

Does the Form 144 indicate the issuer receives proceeds from these sales?

The filing lists resale transactions by an affiliate; it does not state the issuer receives proceeds. The excerpt attributes sales to Christopher Brown under 10b5-1 arrangements.

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

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Accepted by SEC EDGAR 06/03/2026 - 04:31 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	0001836988
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	CHRISTOPHER BROWN
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	70000	619500.00	37813621	06/03/2026	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	Founders Shares	Issuer			70000	02/10/2012	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 CHRISTOPHER BROWN 44 Third Avenue Burlington MA 01803	Common	05/28/2026	30000	270000.00
10b5-1 Sales for CHRISTOPHER BROWN 44 Third Avenue Burlington MA 01803	Common	05/06/2026	20000	144668.00
10b5-1 Sales for CHRISTOPHER BROWN 44 Third Avenue Burlington MA 01803	Common	04/10/2026	17578	124192.11
10b5-1 Sales for CHRISTOPHER BROWN 44 Third Avenue Burlington MA 01803	Common	04/09/2026	7392	52019.36
10b5-1 Sales for CHRISTOPHER BROWN 44 Third Avenue Burlington MA 01803	Common	04/08/2026	15030	105960.75

144: Remarks and Signature

Remarks
Date of Notice	06/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/24/2025
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	/s/ CHRISTOPHER BROWN
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)