Brown Christopher D.
SEC Form 4 insider trading activity
Brown Christopher D. has filed 13 SEC Form 4 filings (19 transaction rows) across 1 company, with disclosures dating back to 2026. 13 of those filings fall inside the rolling window. Most recent filing: Oct 9, 2026.
On the most recent filing, Brown Christopher D. is listed as Director at 908 Devices Inc. Inside the rolling window, Brown Christopher D. reported no open-market purchases and 15 open-market sales totaling $2.2M in MASS. The largest disclosed transaction in the window is a sale of 30,000 MASS shares on Oct 7, 2026, worth $357K.
Companies traded
Other insiders at MASS
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$2.2M
reported sales (SEC code S)
Companies
1
in the rolling window
| Source | |||||||
|---|---|---|---|---|---|---|---|
| MASS | Director | Sale | 30,000 | $357K | Oct 9 | SEC ↗ | |
| MASS | Director | Sale | 30,000 | $317K | Sep 4 | SEC ↗ | |
| MASS | Director | Sale | 9,442 | $85K | Aug 12 | SEC ↗ | |
| MASS | Director | Sale | 8,358 | $77K | Aug 12 | SEC ↗ | |
| MASS | Director | Sale | 20,000 | $170K | Aug 7 | SEC ↗ | |
| MASS | Director | Sale | 2,200 | $20K | Jul 7 | SEC ↗ | |
| MASS | Director | Sale | 20,000 | $177K | Jul 2 | SEC ↗ | |
| MASS | Director | Sale | 9,900 | $89K | Jun 25 | SEC ↗ | |
| MASS | Director | Sale | 100 | $900 | Jun 5 | SEC ↗ | |
| MASS | Director | Sale | 20,000 | $175K | Jun 4 | SEC ↗ | |
| MASS | Director | Sale | 30,000 | $270K | May 29 | SEC ↗ | |
| MASS | Director | Sale | 20,000 | $145K | May 7 | SEC ↗ | |
| MASS | Director | Sale | 15,030 | $106K | Apr 10 | SEC ↗ | |
| MASS | Director | Sale | 7,392 | $52K | Apr 10 | SEC ↗ | |
| MASS | Director | Sale | 17,578 | $124K | Apr 10 | SEC ↗ |
Frequently asked questions
How many SEC Form 4 filings has Brown Christopher D. made?
Brown Christopher D. has filed 13 SEC Form 4 filings (19 transaction rows) across 1 company since 2026.
Which companies does Brown Christopher D. trade?
Brown Christopher D. has filed SEC Form 4 disclosures for 1 company, including MASS.
When was Brown Christopher D.'s most recent SEC Form 4 filing?
Brown Christopher D.'s most recent SEC Form 4 filing on Tracefour is dated Oct 9, 2026.
What is Brown Christopher D.'s total buy and sell value in the current window?
Inside the rolling retention window, Brown Christopher D. bought $0 and sold $2.2M based on SEC Form 4 filings.
What was Brown Christopher D.'s largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 30,000 MASS shares on 2026-10-07, worth $357K, per SEC Form 4 filings.