908 Devices (MASS) CEO sells 60,345 shares under Rule 10b5-1 trading plan

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

908 Devices Inc. President and CEO Kevin J. Knopp reported open‑market sales of 60,345 shares of common stock over three days at prices around $9.06–$9.14 per share. These transactions were made pursuant to a Rule 10b5‑1 trading plan adopted on May 20, 2025, indicating they were pre‑scheduled.

After these sales, Knopp directly holds 735,623 shares of 908 Devices common stock. In addition, 541,223 shares are held indirectly through The Kevin J. Knopp Irrevocable Trust of 2018, for which his brother‑in‑law serves as trustee with sole voting and dispositive power, and of which Knopp may be deemed the beneficial owner.

Insights

CEO Knopp executed pre‑planned sales of about 60K shares while retaining a large remaining stake.

CEO Kevin J. Knopp sold 60,345 shares of 908 Devices Inc. common stock in three open‑market transactions at prices around $9.10 per share. All sales were executed under a Rule 10b5‑1 trading plan adopted on May 20, 2025, suggesting routine portfolio management rather than opportunistic timing.

Following the transactions, Knopp still directly owns 735,623 shares, and 541,223 additional shares are held by The Kevin J. Knopp Irrevocable Trust of 2018, where he may be deemed a beneficial owner. The sold amount is a relatively small portion of his visible overall holdings, so the filing mainly updates ownership records rather than signaling a major shift in insider positioning.

Insider Trade Summary 10b5-1

Net Seller: 60,345 shares ($550,624)

Net Sell 4 txns

Insider Knopp Kevin J.

Role President and CEO

Sold 60,345 shs ($551K)

Type	Security	Shares	Price	Value
Sale	Common Stock	16,388	$9.10	$149K
Sale	Common Stock	40,535	$9.14	$370K
Sale	Common Stock	3,422	$9.06	$31K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 735,623 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 $9.08 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 price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.24 inclusive. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.19 inclusive. 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

Total shares sold: 60,345 shares Sale on June 23, 2026: 3,422 shares at $9.06/share Sale on June 24, 2026: 40,535 shares at $9.14/share +5 more

8 metrics

Total shares sold 60,345 shares Aggregate open-market sales in June 2026

Sale on June 23, 2026 3,422 shares at $9.06/share Open-market sale of common stock

Sale on June 24, 2026 40,535 shares at $9.14/share Open-market sale of common stock

Sale on June 25, 2026 16,388 shares at $9.10/share Open-market sale of common stock

Direct holdings after trades 735,623 shares CEO’s direct ownership following June 25, 2026 sale

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

Price range (weighted average footnote) $9.05–$9.24 Range of prices for multiple sale transactions

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

Key Terms

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

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.

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/25/2026 - 05:15 PM Accepted by SEC EDGAR 06/25/2026 - 05:15 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)
06/23/2026

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	06/23/2026		S⁽¹⁾		3,422	D	$9.06⁽²⁾	792,546	D
Common Stock	06/24/2026		S⁽¹⁾		40,535	D	$9.14⁽³⁾	752,011	D
Common Stock	06/25/2026		S⁽¹⁾		16,388	D	$9.1⁽⁴⁾	735,623	D
Common Stock								541,223	I	See footnote⁽⁵⁾

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 $9.08 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 price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.24 inclusive.

4. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.05 to $9.19 inclusive.

5. 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	06/25/2026
	** 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) CEO Kevin Knopp report in this Form 4?

Kevin J. Knopp reported selling 60,345 shares of 908 Devices common stock in open‑market transactions. The sales occurred over three days at prices slightly above $9 per share and were executed under a pre‑arranged Rule 10b5‑1 trading plan.

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

Kevin Knopp sold 60,345 shares in total: 3,422 shares at $9.06, 40,535 shares at $9.14, and 16,388 shares at $9.10. Footnotes state these prices are weighted averages for multiple trades within narrow ranges around those levels.

Does Kevin Knopp still hold a significant stake in 908 Devices (MASS) after these sales?

Yes. After the reported sales, Kevin Knopp directly owns 735,623 shares of 908 Devices common stock. An additional 541,223 shares are held by The Kevin J. Knopp Irrevocable Trust of 2018, where he may be deemed a beneficial owner under SEC rules.

Were the 908 Devices (MASS) CEO’s stock sales pre‑planned?

The filing says the transactions were made under a Rule 10b5‑1 trading plan adopted on May 20, 2025. Such plans schedule trades in advance, so the timing of these sales reflects a pre‑set program rather than day‑to‑day market decisions.

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

The trust owns 541,223 908 Devices shares. Knopp’s brother‑in‑law, as trustee, has sole voting and dispositive control over securities held by the trust. The filing states Kevin Knopp may be deemed the beneficial owner of these indirectly held shares.