908 Devices (MASS) CEO Knopp logs small 222-share sale under Rule 10b5-1 plan

Rhea-AI Filing Summary

908 Devices Inc. President and CEO Kevin J. Knopp reported an open-market sale of 222 shares of common stock at a weighted average price of $9.07 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on May 20, 2025.

After this sale, Knopp directly holds 732,603 shares of common stock. Separately, 541,223 shares are held indirectly through The Kevin J. Knopp Irrevocable Trust of 2018, for which his brother-in-law, as trustee, has sole voting and dispositive control, while Knopp may be deemed a beneficial owner.

Insights

Equity compensation and insider-trading analyst

CEO executes a very small 10b5-1 planned sale, overall position remains large.

The filing shows CEO Kevin J. Knopp sold 222 shares of 908 Devices common stock at a weighted average of $9.07 per share. The transaction is coded as an open-market sale and was carried out under a pre-established Rule 10b5-1 trading plan adopted on May 20, 2025, indicating it was pre-planned rather than opportunistic.

Following the transaction, Knopp directly holds 732,603 shares, and another 541,223 shares are held in an irrevocable trust where his brother-in-law, as trustee, has sole voting and dispositive power, although Knopp may be deemed a beneficial owner. Relative to these holdings, selling 222 shares is minor and appears as routine portfolio activity rather than a thesis-changing move.

Insider Trade Summary 10b5-1

Net Seller: 222 shares ($2,014)

Net Sell 2 txns

Insider Knopp Kevin J.

Role President and CEO

Sold 222 shs ($2K)

Type	Security	Shares	Price	Value
Sale	Common Stock	222	$9.07	$2K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 732,603 shares (Direct, null); Common Stock — 541,223 shares (Indirect, See footnote)

Footnotes (1)

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 $9.062 to $9.07 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 range set forth in this footnote. 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: 222 shares Weighted average sale price: $9.07 per share Direct holdings after transaction: 732,603 shares +1 more

4 metrics

Shares sold 222 shares Open-market sale on July 2, 2026

Weighted average sale price $9.07 per share Common stock sale range $9.062–$9.07

Direct holdings after transaction 732,603 shares Common stock directly owned after sale

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

Key Terms

Rule 10b5-1 trading plan, weighted average price, beneficial owner, Irrevocable Trust

4 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 $9.062 to $9.07 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.

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.

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/07/2026 - 04:45 PM Accepted by SEC EDGAR 07/07/2026 - 04:45 PM Learn about SEC filing dates

FAQ

What insider transaction did 908 Devices (MASS) report for CEO Kevin Knopp?

908 Devices reported that CEO Kevin J. Knopp sold 222 shares of common stock. The shares were sold at a weighted average price of $9.07 per share in an open-market transaction executed under a pre-arranged Rule 10b5-1 trading plan.

How many 908 Devices (MASS) shares does CEO Kevin Knopp hold after this Form 4?

After the reported sale, Kevin J. Knopp directly holds 732,603 shares of 908 Devices common stock. An additional 541,223 shares are held indirectly through The Kevin J. Knopp Irrevocable Trust of 2018, where he may be deemed a beneficial owner.

Was the 908 Devices (MASS) CEO’s share sale under a Rule 10b5-1 plan?

Yes. The filing states the sale was made pursuant to a Rule 10b5-1 trading plan adopted by Kevin J. Knopp on May 20, 2025. Such plans pre-schedule trades, reducing the significance of trade timing as a discretionary signal.

What price did the 908 Devices (MASS) CEO receive for the sold shares?

The Form 4 reports a weighted average sale price of $9.07 per share. Footnotes explain the 222 shares were sold in multiple transactions at prices ranging from $9.062 to $9.07, and detailed price breakdowns are available on request from the issuer or SEC staff.

How are the indirectly held 908 Devices (MASS) shares structured for Kevin Knopp?

The filing states 541,223 shares are owned by The Kevin J. Knopp Irrevocable Trust of 2018. Knopp’s brother-in-law, as trustee, has sole voting and dispositive control, while Knopp may be deemed the beneficial owner of securities held by the trust.

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).

X

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)
07/02/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/02/2026		S(1)		222	D	$9.07(2)	732,603	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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 $9.062 to $9.07 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 range set forth in this footnote.

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	07/07/2026
	** 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)