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AWM Investment (MASS) funds log small open-market sales but keep large stake

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

AWM Investment Company, Inc., a greater-than-10% owner of 908 Devices Inc., reported open-market sales of the company’s common stock through limited partnerships it advises. On June 22 and 23, the funds sold a total of 7,718 shares at prices around $9 per share. After these trades, entities advised by AWM indirectly held 4,879,773 shares of common stock, spread across several Special Situations funds. AWM is described as having sole voting and investment power over these fund holdings, while formally disclaiming beneficial ownership except to the extent of its pecuniary interest.

Positive

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Negative

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Insights

AWM-linked funds made a small net sale while keeping a large remaining stake.

The filing shows funds advised by AWM Investment Company, Inc. executed open-market sales totaling 7,718 shares of 908 Devices Inc. common stock at prices just under $9 per share. These are straightforward sales, not option exercises or tax-related events.

After the transactions, AWM-advised funds still held 4,879,773 shares, indicating the sales were minor relative to the overall position visible here. Footnotes state AWM has sole voting and investment power for the funds’ holdings but formally disclaims full beneficial ownership beyond its pecuniary interest, which is a common structure for investment advisers.

Insider AWM Investment Company, Inc.
Role null
Sold 7,718 shs ($69K)
Type Security Shares Price Value
Sale Common Stock 3,050 $9.0041 $27K
Sale Common Stock 4,668 $8.99 $42K
Holdings After Transaction: Common Stock — 4,879,773 shares (Indirect, By Limited Partnerships)
Footnotes (1)
  1. This is a weighted average price. AWM Investment Company, Inc., a Delaware Corporation (AWM), is the investment adviser to Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (CAY), Special Situations Private Equity Fund, L.P. (SSPE), Special Situations Technology Fund, L.P. (TECH) and Special Situations Technology Fund II, L.P. (TECH II and together with SSFQP, CAY, SSPE and TECH, the Funds). As the investment adviser to the Funds, AWM holds sole voting and investment power over 2,020,434 shares of Common Stock of the Issuer (the Shares) held by SSFQP, 577,077 Shares held by CAY, 266,802 Shares held by SSPE, 338,137 Shares held by TECH and 1,677,323 Shares held by TECH II. David M. Greenhouse (Greenhouse) and Adam C. Stettner (Stettner) are the controlling principals of AWM. The reporting person disclaims beneficial ownership of the Shares, except to the extent of its pecuniary interest therein. This report shall not be deemed an admission that the reporting person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
Total shares sold 7,718 shares Open-market sales on June 22 and June 23
Shares sold June 22 4,668 shares at $8.99/share Common stock open-market sale
Shares sold June 23 3,050 shares at $9.0041/share Common stock open-market sale, weighted-average price
Post-transaction holdings 4,879,773 shares Indirectly held by AWM-advised funds after sales
Largest single fund position 2,020,434 shares Held by Special Situations Fund III QP, L.P.
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.
beneficial ownership financial
"The reporting person disclaims beneficial ownership of the Shares"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
pecuniary interest financial
"except to the extent of its pecuniary interest therein"
investment adviser financial
"AWM is the investment adviser to Special Situations Fund III QP, L.P."
An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.
voting and investment power financial
"AWM holds sole voting and investment power over 2,020,434 shares"
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
AWM Investment Company, Inc.
(Last)(First)(Middle)
527 MADISON AVENUE
SUITE 2600
(Street)
NEW YORK NEW YORK 10022
(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)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/22/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/22/2026S4,668D$8.99(1)4,882,823IBy Limited Partnerships
Common Stock06/23/2026S3,050D$9.0041(1)4,879,773(2)(3)I(2)(3)By Limited Partnerships(2)(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This is a weighted average price.
2. AWM Investment Company, Inc., a Delaware Corporation (AWM), is the investment adviser to Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (CAY), Special Situations Private Equity Fund, L.P. (SSPE), Special Situations Technology Fund, L.P. (TECH) and Special Situations Technology Fund II, L.P. (TECH II and together with SSFQP, CAY, SSPE and TECH, the Funds). As the investment adviser to the Funds, AWM holds sole voting and investment power over 2,020,434 shares of Common Stock of the Issuer (the Shares) held by SSFQP, 577,077 Shares held by CAY, 266,802 Shares held by SSPE, 338,137 Shares held by TECH and 1,677,323 Shares held by TECH II.
3. David M. Greenhouse (Greenhouse) and Adam C. Stettner (Stettner) are the controlling principals of AWM. The reporting person disclaims beneficial ownership of the Shares, except to the extent of its pecuniary interest therein. This report shall not be deemed an admission that the reporting person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
Adam Stettner06/24/2026
** Signature of Reporting PersonDate
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