Key facts
- This page summarizes AWM Investment Company, Inc.'s Form 4 filing for 908 Devices Inc. (MASS).
- 2 reported transactions and 0 derivative rows are listed below.
- Accepted by SEC: 04 Jun 2026, 16:43.
AWM Investment Company, Inc. - 02 Jun 2026 Form 4 Insider Report for 908 Devices Inc. (MASS)
- Reporting relationship
- 10%+ Owner
- Issuer ticker
- MASS
- Reported as of
- 02 Jun 2026
- Net transaction value
- -$379,231
- SEC form
- 4
- Accepted by SEC
- 04 Jun 2026, 16:43:47 UTC
- Prior SEC filing
- 29 May 2026
- Next SEC filing
- 18 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- Adam Stettner
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
AWM Investment Company, Inc. filed Form 4 for 908 Devices Inc. (MASS) on 04 Jun 2026.
Change
- Previous filing in this sequence was filed on 29 May 2026.
- Current net transaction value: -$379,231.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001535264
Primary reporting owner
AWM Investment Company, Inc.
- Relationship
- 10%+ Owner
- Address
- 527 MADISON AVENUE, SUITE 2600, NEW YORK
- Signature
- Adam Stettner
- Signature date
- 04 Jun 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
MASS
transaction
908 DEVICES, INC.
Sale
- Transaction value
- $22,375
- Shares
- -2,500
- Change %
- -0.05%
- Price
- $8.95
- Shares after
- 4,927,273
- Date
- 02 Jun 2026
- Ownership
- By Limited Partnership
- Footnotes
- F1
MASS
transaction
908 DEVICES, INC.
Sale
- Transaction value
- $356,856
- Shares
- -39,782
- Change %
- -0.81%
- Price
- $8.97
- Shares after
- 4,887,491
- Date
- 04 Jun 2026
- Ownership
- By Limited Partnership
- Footnotes
- F1, F2, F3
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 3 footnotes
Footnote F1
This is a weighted average price.
Footnote F2
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 2,025,616 shares of Common Stock of the Issuer (the Shares) held by SSFQP, 578,813 Shares held by CAY, 267,602 Shares held by SSPE, 338,137 Shares held by TECH and 1,677,323 Shares held by TECH II.
Footnote F3
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.