908 Devices (MASS) 10% Owner AWM Sells Shares

What Happened
AWM Investment Company, Inc., reported as a 10% owner and investment adviser to several Special Situations funds, sold a total of 50,000 shares of 908 Devices (MASS) in two open-market transactions. On Aug 20, 2026 AWM disposed of 8,422 shares at $10.52 each for $88,638, and on Aug 21, 2026 it disposed of 41,578 shares at $10.61 each for $441,159, for total proceeds of $529,797. These were outright sales (not purchases, option exercises, or awards).

Key Details

• Transaction dates & prices:
  • Aug 20, 2026 — 8,422 shares sold at $10.52 (proceeds $88,638).
  • Aug 21, 2026 — 41,578 shares sold at $10.61 (proceeds $441,159).
  • Combined = 50,000 shares for $529,797.
• Shares held (per footnote): AWM reported sole voting/investment power over 4,779,773 shares across the Funds before these sales; after disposing of 50,000 shares the interest is roughly 4,729,773 shares.
• Footnotes of note:
  • F1: reported prices are weighted average prices.
  • F2: AWM is adviser to multiple funds (SSFQP, CAY, SSPE, TECH, TECH II) and lists holdings per fund.
  • F3: AWM’s controlling principals are named and AWM disclaims beneficial ownership except for pecuniary interest.
• Filing timing: Report period begins Aug 20, 2026 and the Form 4 was filed Aug 24, 2026. Form 4s are typically due within two business days of the transaction; the four-day gap suggests the filing may have been late.

Context
This transaction is institutional selling by a 10% owner/adviser — not an individual officer or director. Institutional sales can reflect portfolio rebalancing or liquidity needs and do not on their own indicate management sentiment about the company. There were no option exercises, awards, or gifts reported in this filing.