Transaction · 0001836988-26-000027

Brown Christopher D.

Brown Christopher D., DIR, reported a transaction classified as exercise at 908 Devices Inc. involving 60000.000000 shares for an estimated $0.00. Reported holdings after the transaction were 54318.000000 shares. The stored filing text includes a detected 10b5-1 reference.

exerciseSEC transaction code MDIR
MASS908 Devices Inc.
Filing timeOct 09
Trade dateOct 07, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position tradedUnavailableNot calculated for derivative securities.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$12.05
Pre-filing
1mo ago -16.6%1w ago +2.4%1d ago +2.3%
Returns since
7d30d90d180d1y

MASS price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MASS since 2026-10-09Filed today · pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Derivative
Type
exercise
Code M
Identifier
0001836988-26-000027
Stock Option (option to buy)
Transaction date
Oct 07, 2026
Filed Oct 09, 2026, 08:15 PM · 2d delay
Shares
60.0k sh
$0.00 per share
Estimated value
$0
Computed from shares × price
Holdings after
54.3k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Derivative Transaction Direct Ownership Large Holdings Reduction 10b5-1 Detected
-16score
Filing-only score

-16

Compact filing score computed from stored Form 4 facts. Version v1.

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

No officer title

Officer NoDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    This transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 24, 2025.

  2. F2

    The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.75 to $12.12 inclusive. The Reporting Person undertakes to provide to the Iss…

  3. F3

    The shares underlying the option are fully vested and immediately exercisable.

Original filing · 0001836988-26-000027
Related transactions

0 other filings

Same reporting owner
Recent company activity

0 recent txs

MASS