908 Devices MASS Insider Ownership

Updated Oct 10, 2026

In the last 12 months, insiders at 908 Devices made open-market sales of $7.33 million (797.45K shares) and bought no shares on the open market.

• A count shows 6 insiders selling MASS stock on the open market over the past 12 months and none buying.
• Kevin J. Knopp (President and CEO) was MASS's largest open-market seller in the past 12 months, with $2.55 million of sales (274.76K shares); the latest was on August 17, 2026.
• Christopher D. Brown (Director) made the most recent open-market trade by an insider of 908 Devices, a sale of 30K shares for $356,700 on October 7, 2026.
• Outside the open market, 908 Devices insiders acquired 367.74K shares through option exercises and conversions over the past 12 months.
• Business Quant data puts insider holdings in MASS at 12.65Mn shares across insiders' latest Form 4 filings, or 33.23% of the 38.06Mn shares outstanding; that total is down 2.85% from 13.02Mn shares at the end of Q2 2026.
• Indirect holdings, through trusts, partnerships, family members and other entities, make up 83.83% (10.6Mn shares) of 908 Devices' insider total, with the other 16.17% (2.04Mn shares) held directly.
• Holdings in 908 Devices stock are reported by 15 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
• 908 Devices' top three insider holders by shares held are Keith Crandell (Director, 5.76Mn shares), Awm Investment Company, Inc. (10% owner, 4.74Mn shares) and Christopher D. Brown (Director, 805.56K shares).
• Of the shares held by MASS insiders, 45.58% belong to Keith Crandell.
• Over the trailing 12 months, 14 insiders reported transactions in MASS stock across 50 Form 4 filings.
• This summary of 908 Devices insider activity covers Form 4 filings through October 9, 2026.