908 Devices (MASS) SVP sells 24,000 shares after option exercise

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

908 Devices Inc. senior vice president Kevin J. McCallion exercised employee stock options and immediately sold the resulting shares in planned trades. He exercised options for 24,000 shares of common stock at $1.05 per share, then sold 24,000 shares in open-market transactions at weighted-average prices around $7.04 per share.

The sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on December 9, 2025, indicating the timing was scheduled in advance. After these transactions, McCallion directly holds 44,925 shares of 908 Devices common stock.

Insider Trade Summary 10b5-1

Net Seller: 24,000 shares ($169,092)

Net Sell 6 txns

Insider McCallion Kevin J.

Role SVP, Products and Production

Sold 24,000 shs ($169K)

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy)	5,420	$0.00	--
Exercise	Common Stock	5,420	$1.05	$6K
Sale	Common Stock	5,420	$7.03	$38K
Exercise	Stock Option (right to buy)	18,580	$0.00	--
Exercise	Common Stock	18,580	$1.05	$20K
Sale	Common Stock	18,580	$7.05	$131K

Holdings After Transaction: Stock Option (right to buy) — 2,686 shares (Direct); Common Stock — 50,345 shares (Direct)

Footnotes (1)

This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.25 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3). The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.09 inclusive. The shares underlying the option are fully vested and immediately exercisable.

Key Figures

Options exercised: 24,000 shares at $1.05 Shares sold: 24,000 shares Sale price range (larger block): $7.00–$7.25 +3 more

6 metrics

Options exercised 24,000 shares at $1.05 Stock options converted to common stock

Shares sold 24,000 shares Open-market sales across two days

Sale price range (larger block) $7.00–$7.25 Weighted-average price range for 18,580-share sale

Sale price range (smaller block) $7.00–$7.09 Weighted-average price range for 5,420-share sale

Direct holdings after transactions 44,925 shares Common stock held directly post-trade

Rule 10b5-1 plan adoption date December 9, 2025 Pre-arranged trading plan governing these sales

Key Terms

Rule 10b5-1 trading plan, weighted average price, Stock Option (right to buy), open-market sale, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Stock Option (right to buy) financial

"security_title": "Stock Option (right to buy)""

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

Form 4 Insider Transactions: What Each Field Means →

04/10/2026 - 07:31 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

McCallion Kevin J.

(Last)

(First)

(Middle)

C/O 908 DEVICES INC.

44 3RD AVENUE

(Street)

BURLINGTON

MASSACHUSETTS

01803

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
908 Devices Inc. [ MASS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP, Products and Production

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/08/2026		M⁽¹⁾		18,580	A	$1.05	63,505	D
Common Stock	04/08/2026		S⁽¹⁾		18,580	D	$7.05⁽²⁾	44,925	D
Common Stock	04/09/2026		M⁽¹⁾		5,420	A	$1.05	50,345	D
Common Stock	04/09/2026		S⁽¹⁾		5,420	D	$7.03⁽³⁾	44,925	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (right to buy)	$1.05	04/08/2026		M⁽¹⁾			18,580	⁽⁴⁾	08/27/2030	Common Stock	18,580	$0	8,106	D
Stock Option (right to buy)	$1.05	04/09/2026		M⁽¹⁾			5,420	⁽⁴⁾	08/27/2030	Common Stock	5,420	$0	2,686	D

Explanation of Responses:

1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 9, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.25 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3).

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.00 to $7.09 inclusive.

4. The shares underlying the option are fully vested and immediately exercisable.

	/s/ Mark S. Levine, Attorney-in-Fact	04/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What did 908 Devices (MASS) executive Kevin McCallion report in this Form 4?

Kevin McCallion reported exercising stock options and selling the resulting 908 Devices shares. He exercised options for 24,000 common shares at $1.05 and sold 24,000 shares in open-market trades at weighted-average prices just above $7.00 per share under a pre-set trading plan.

How many 908 Devices (MASS) shares did the SVP sell and at what prices?

McCallion sold 24,000 908 Devices common shares in total. One sale batch of 18,580 shares used a weighted-average price between $7.00 and $7.25, while another 5,420-share batch used a weighted-average price between $7.00 and $7.09, as disclosed in the Form 4 footnotes.

What stock options did Kevin McCallion exercise at 908 Devices (MASS)?

He exercised stock options covering 24,000 shares of 908 Devices common stock. The options had an exercise price of $1.05 per share and were described as fully vested and immediately exercisable, turning derivative rights into actual common shares before the reported sales occurred.

Does Kevin McCallion still hold 908 Devices (MASS) shares after these transactions?

Yes. After exercising options and selling 24,000 shares, McCallion directly holds 44,925 shares of 908 Devices common stock. This post-transaction holding indicates he retains a meaningful equity position in the company even after the planned liquidity transactions disclosed in the Form 4.

Were the 908 Devices (MASS) insider sales made under a Rule 10b5-1 plan?

The filing states the transactions were made under a Rule 10b5-1 trading plan adopted on December 9, 2025. Such plans schedule trades in advance, providing a structured way for insiders to diversify holdings without making ad hoc timing decisions based on undisclosed information.