908 Devices (MASS) CEO sells 2,798 shares under Rule 10b5-1 plan

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

908 Devices Inc. President and CEO Kevin J. Knopp reported an open-market sale of 2,798 shares of common stock at a weighted average price of $9.09 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on May 20, 2025.

Following the sale, Knopp directly holds 732,825 shares of common stock. In addition, 541,223 shares are held indirectly by The Kevin J. Knopp Irrevocable Trust of 2018, for which his brother-in-law serves as trustee and has sole voting and dispositive control; Knopp may be deemed the beneficial owner of those securities.

Insider Trade Summary 10b5-1

Net Seller: 2,798 shares ($25,434)

Net Sell 2 txns

Insider Knopp Kevin J.

Role President and CEO

Sold 2,798 shs ($25K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,798	$9.09	$25K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 732,825 shares (Direct, null); Common Stock — 541,223 shares (Indirect, See footnote)

Footnotes (1)

This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.20 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), (3) and (4). The shares are owned directly by The Kevin J. Knopp Irrevocable Trust of 2018. The reporting person's brother-in-law is the trustee of The Kevin J. Knopp Irrevocable Trust of 2018 and has sole voting and dispositive control with respect to all securities held by such trust. The reporting person may be deemed to be the beneficial owner of the securities held by The Kevin J. Knopp Irrevocable Trust of 2018.

Key Figures

Shares sold: 2,798 shares Average sale price: $9.09 per share Post-sale direct holdings: 732,825 shares +3 more

6 metrics

Shares sold 2,798 shares Open-market sale of common stock on June 26, 2026

Average sale price $9.09 per share Weighted average price for 2,798 shares sold

Post-sale direct holdings 732,825 shares Common stock directly owned after June 26, 2026 sale

Indirect trust holdings 541,223 shares Shares held by The Kevin J. Knopp Irrevocable Trust of 2018

Trading plan adoption date May 20, 2025 Date Rule 10b5-1 trading plan was adopted

Sale price range $9.05 to $9.20 per share Range of individual trade prices within the reported sale

Key Terms

Rule 10b5-1 trading plan, weighted average price, irrevocable trust, beneficial owner, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025."

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 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.20 inclusive."

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.

irrevocable trust financial

"The shares are owned directly by The Kevin J. Knopp Irrevocable Trust of 2018."

An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.

beneficial owner regulatory

"The reporting person may be deemed to be the beneficial owner of the securities held by The Kevin J. Knopp Irrevocable Trust of 2018."

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

dispositive control regulatory

"The reporting person's brother-in-law is the trustee ... and has sole voting and dispositive control with respect to all securities held by such trust."

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/30/2026 - 05:10 PM Accepted by SEC EDGAR 06/30/2026 - 05:10 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^*

Knopp 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)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026

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	06/26/2026		S⁽¹⁾		2,798	D	$9.09⁽²⁾	732,825	D
Common Stock								541,223	I	See footnote⁽³⁾

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)

Explanation of Responses:

1. This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.

2. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.20 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), (3) and (4).

3. The shares are owned directly by The Kevin J. Knopp Irrevocable Trust of 2018. The reporting person's brother-in-law is the trustee of The Kevin J. Knopp Irrevocable Trust of 2018 and has sole voting and dispositive control with respect to all securities held by such trust. The reporting person may be deemed to be the beneficial owner of the securities held by The Kevin J. Knopp Irrevocable Trust of 2018.

	/s/ Mark S. Levine, Attorney-in-Fact	06/30/2026
	** 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 insider transaction did 908 Devices (MASS) report for Kevin J. Knopp?

908 Devices reported that President and CEO Kevin J. Knopp sold 2,798 shares of common stock. The shares were sold in the open market at a weighted average price of $9.09 per share, according to the Form 4 insider trading filing.

At what price did Kevin J. Knopp sell 908 Devices (MASS) shares?

Kevin J. Knopp’s 2,798 908 Devices shares were sold at a weighted average price of $9.09. The filing notes multiple trades occurred in a price range between $9.05 and $9.20 per share, resulting in the reported average sale price.

Was Kevin J. Knopp’s 908 Devices (MASS) stock sale under a Rule 10b5-1 plan?

Yes. The Form 4 states the transaction was executed under a Rule 10b5-1 trading plan. This plan was adopted by Kevin J. Knopp on May 20, 2025, indicating the sale was pre-arranged rather than a discretionary, spur-of-the-moment market decision.

How many 908 Devices (MASS) shares does Kevin J. Knopp hold after the sale?

After the reported sale, Kevin J. Knopp directly holds 732,825 shares of 908 Devices common stock. Additionally, 541,223 shares are held indirectly through The Kevin J. Knopp Irrevocable Trust of 2018, for which he may be deemed the beneficial owner.

What is The Kevin J. Knopp Irrevocable Trust of 2018’s role in 908 Devices (MASS) holdings?

The Kevin J. Knopp Irrevocable Trust of 2018 directly owns 541,223 908 Devices shares. Knopp’s brother-in-law is the trustee with sole voting and dispositive control over these securities, and Kevin J. Knopp may be deemed the beneficial owner under securities rules.

How many 908 Devices (MASS) insider sales and buys were in this Form 4?

This Form 4 reports one open-market sale of 2,798 shares and no insider purchases. It also includes one entry reflecting 541,223 shares held indirectly as a trust holding, which is reported as a position rather than a new purchase or sale transaction.