Kevin McCallion files Form 144 to sell 27,000 shares

Kevin McCallion reported a proposed sale of 27,000 shares of Common Stock via exercise of stock options on 04/08/2026.

Rhea-AI Filing Summary

Kevin McCallion reported a proposed sale of 27,000 shares of Common Stock via exercise of stock options on 04/08/2026. The filing lists the method as a cash exercise with sales planned through the issuer on NASDAQ. The record also lists prior 10b5-1 sales earlier in 2026 (including 9,438 and 9,000 share transactions).

Insights

Corporate Governance Analyst

Routine insider liquidity transaction under option exercise and prior 10b5-1 plan.

This filing documents an option exercise and planned sale of 27,000 shares executed as a cash exercise and routed through the issuer on 04/08/2026. Prior 10b5-1 sales earlier in 2026 are listed with discrete share counts and proceeds.

These items are procedural liquidity events; no new corporate action or material change to governance or capital structure is shown. Subsequent filings would show completed dispositions and post-transaction holdings if relevant.

Key Figures

Proposed shares to sell: 27,000 shares Prior sale (01/22/2026): 9,438 shares Prior sale (02/18/2026): 9,000 shares +2 more

5 metrics

Proposed shares to sell 27,000 shares planned sale via option exercise on 04/08/2026

Prior sale (01/22/2026) 9,438 shares 10b5-1 sale on 01/22/2026 with proceeds $66,090.36

Prior sale (02/18/2026) 9,000 shares 10b5-1 sale on 02/18/2026 with proceeds $63,336.60

Prior sale (02/20/2026) 300 shares 10b5-1 sale on 02/20/2026 with proceeds $2,108.01

Prior sale (03/02/2026) 7 shares 10b5-1 sale on 03/02/2026 listed at $49.00

Key Terms

Form 144, 10b5-1, exercise of stock options

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

10b5-1 regulatory

"10b5-1 Sales for KEVIN MCCALLION"

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.

exercise of stock options financial

"Exercise of Stock Options | Issuer"

FAQ

What does the Form 144 for MASS show about Kevin McCallion?

It shows a proposed sale of 27,000 shares via exercise of stock options on 04/08/2026. The notice lists the sale method as a cash exercise through the issuer on NASDAQ and references prior 10b5-1 sales in 2026.

Were there prior insider sales by Kevin McCallion in 2026?

Yes. The filing lists multiple prior 10b5-1 sales in 2026, including 9,438 shares (01/22/2026) and 9,000 shares (02/18/2026). Each prior sale shows dates, share counts, and gross proceeds where provided.

How is the 27,000-share transaction being executed?

The filing states the transaction is an exercise of stock options with a cash method and sale planned through the issuer on 04/08/2026. The security is listed for trading on NASDAQ in the notice.

Does this Form 144 change company ownership or governance?

No. This notice records an insider liquidity event—an option exercise and planned resale. It does not report changes to board composition, corporate governance, or company capital structure in this excerpt.

Where can I find the amounts and proceeds from prior sales listed?

Prior entries show share counts and proceeds for 10b5-1 sales, for example 9,000 shares with proceeds $63,336.60 (02/18/2026) and 9,438 shares with proceeds $66,090.36 (01/22/2026). These figures are included in the filing excerpt.

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Accepted by SEC EDGAR 04/08/2026 - 04:31 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	0002115341
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	KEVIN MCCALLION
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	27000	182520.00	37379953	04/08/2026	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	04/08/2026	Exercise of Stock Options	Issuer			27000	04/08/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for KEVIN MCCALLION 44 3rd Avenue Burlington MA 01803	Common	03/02/2026	7	49.00
10b5-1 Sales for KEVIN MCCALLION 44 3rd Avenue Burlington MA 01803	Common	02/20/2026	300	2108.01
10b5-1 Sales for KEVIN MCCALLION 44 3rd Avenue Burlington MA 01803	Common	02/18/2026	9000	63336.60
10b5-1 Sales for KEVIN MCCALLION 44 3rd Avenue Burlington MA 01803	Common	01/22/2026	9438	66090.36

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	04/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/09/2025
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/ Kevin McCallion
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)