908 Devices (MASS) 10% Owner AWM Investment Sells 18,000 Shares

What Happened

• AWM Investment Company, Inc. (a 10% owner and investment adviser to several funds) reported an open-market/private sale of 18,000 shares of 908 Devices, Inc. (ticker: MASS) on 2026-09-29. The shares were disposed at a weighted average price of $11.52 per share, for total proceeds of approximately $207,322. This was a sale (a disposition), not a purchase.

Key Details

• Transaction date and price: 2026-09-29 — 18,000 shares sold at a weighted average of $11.52/share (total ≈ $207,322). (Footnote F1: price is a weighted average.)
• Shares controlled before/after: AWM reports sole voting and investment power over 4,736,773 shares across affiliated funds (SSFQP, CAY, SSPE, TECH, TECH II); after this sale that aggregate position would be ~4,718,773 shares. (Footnote F2 lists the per-fund holdings.)
• Reporting party and structure: AWM Investment Company, Inc. is the adviser; controlling principals are David M. Greenhouse and Adam C. Stettner. AWM disclaims beneficial ownership except for pecuniary interest (Footnote F3).
• Filing: Form 4 filed on 2026-10-01 reporting the 2026-09-29 transaction; no late-filing flag is indicated in the record provided.

Context

• This filing reflects institutional trading by a 10% owner/adviser, not direct executive trading. Institutional sales can reflect portfolio rebalancing or other fund-level decisions and do not by themselves signal management view of the company.