Reporting owner · CIK 0001836988

Brown Christopher D.

Visual SEC Form 4 history across 1 companies, 18 transactions and 5 filings.

DIR908 Devices Inc.
Open-market mix
Latest filingSep 04, 2026, 08:15 PM
Filings5Form 4 records
Buying$00 purchases
Selling$606.5K6 sales
Net value−$606.5KBuys minus sells
Companies12 securities
Most recentSep 02, 2026sale

Open-market buy performance

90-day forward return on this insider's open-market purchases

90d forward
Forward return is not available yet

We compute this from each buy's stock performance 90 days after the transaction. The price history is still being populated for this insider's their open-market buys, so the average and median will appear here once the daily price refresh has covered the relevant trading days.

Monthly open-market activity

Reported purchase and sale transaction counts

Buys Sells
530-3-53Feb 25Feb 261May 261Jun 261Sep 26

Net value flow

Buys minus sells

Feb 25
−$18.2K
Feb 26
$0
May 26
−$270K
Jun 26
−$900
Sep 26
−$317.4K

Transaction texture

Ownership and ticket size

Average P/S size$101.1K
Median P/S size$7.1K
Direct18
Indirect0
Sep 02, 2026sale

Filing-only signals

Deterministic matches in this insider's history

Cluster Sellingpattern2Derivative Transactionfiling-context6Direct Ownershipfiling-context17Large Holdings Reductionholdings5Large Salesize1Repeat Sellerpattern110b5-1 Detectedfiling-context2

Latest Form 4 facts

Quick context from source filings

Latest transaction

sale at 908 Devices Inc. on Sep 02, 2026 valued at $317,400.

Review SEC filing
Latest buy

No open-market insider purchase is available.

Associated companies

Visual map of known reporting history

MASS908 Devices Inc.18 transactions · latest Sep 04, 2026, 08:15 PM
TickerInsiderRoleTypeSharesValueCodeSignals90d returnFiledTrans date
MASSBrown Christopher D.
DIR
sale10b5-130.0k-$31.7MS
Cluster Selling Direct Ownership Large Sale+1
0.0%09/0409/02
MASSBrown Christopher D.
DIR
sale10b5-1100-$90.0kS
Cluster Selling Direct Ownership Repeat Seller+1
+38.1%06/0506/04
MASSBrown Christopher D.
DIR
sale10b5-130.0k-$27.0MS
Cluster Selling Direct Ownership Large Sale+1
+30.2%05/2905/28
MASSBrown Christopher D.
DIR
exercise10.9k$0M
Derivative Transaction Direct Ownership Large Holdings Reduction
+10.0%02/0402/01
MASSBrown Christopher D.
DIR
exercise7.41k$0M
Derivative Transaction Direct Ownership Large Holdings Reduction
+10.0%02/0402/01
MASSBrown Christopher D.
DIR
exercise5.02k$0M
Derivative Transaction Direct Ownership
+10.0%02/0402/01
MASSBrown Christopher D.
DIR
exercise10.9k—M
Direct Ownership
+10.0%02/0402/01
MASSBrown Christopher D.
DIR
exercise7.41k—M
Direct Ownership
+10.0%02/0402/01
MASSBrown Christopher D.
DIR
exercise5.02k—M
Direct Ownership
+10.0%02/0402/01
MASSBrown Christopher D.
CPO
exercise10.9k$0M
Derivative Transaction Direct Ownership Large Holdings Reduction
—02/04/202502/01/2025

Brown Christopher D. Insider Activity FAQ

SEC Form 4 context

Who is Brown Christopher D.?

Brown Christopher D. is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001836988.

Which companies has Brown Christopher D. reported transactions for?

908 Devices Inc.

When was Brown Christopher D.'s latest insider buy?

No open-market insider purchase is available for this period.

When was Brown Christopher D.'s latest insider sale?

sale at 908 Devices Inc. on Sep 02, 2026 valued at $317,400.

Where can I see the original SEC filings?

Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.

Are performance metrics included?

This version does not calculate win rates, forward returns, benchmark-adjusted returns, or high-conviction scores.