Reporting owner · CIK 0001836988
Brown Christopher D.
SEC Form 4 history across 1 companies, 6 transactions and 4 filings.
DIR908 Devices Inc.
Open-market transaction mix0% buys0 buys · 4 sales
Available history · May 28, 2026 – Oct 07, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
MASS908 Devices Inc. | Brown Christopher D.DIR | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
MASS908 Devices Inc. | Brown Christopher D.DIR | M · exercise10b5-1 detectedSEC filing ↗ | $105kView disclosure → | |
MASS908 Devices Inc. | Brown Christopher D.DIR | S · sale10b5-1 detectedSEC filing ↗ | -$356kView disclosure → | |
MASS908 Devices Inc. | Brown Christopher D.DIR | S · sale10b5-1 detectedSEC filing ↗ | -$317kView disclosure → | |
MASS908 Devices Inc. | Brown Christopher D.DIR | S · sale10b5-1 detectedSEC filing ↗ | -$900View disclosure → | |
MASS908 Devices Inc. | Brown Christopher D.DIR | S · sale10b5-1 detectedSEC filing ↗ | -$270kView disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
sale at 908 Devices Inc. on Oct 07, 2026 valued at $356,700.
Review SEC filingLatest buy
No open-market insider purchase is available.
Monthly open-market activity
Last 4 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| May 2026 | 0 | 1 | $0.00 | $270,000.00 | -$270,000.00 |
| Jun 2026 | 0 | 1 | $0.00 | $900.00 | -$900.00 |
| Sep 2026 | 0 | 1 | $0.00 | $317,400.00 | -$317,400.00 |
| Oct 2026 | 0 | 1 | $0.00 | $356,700.00 | -$356,700.00 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$236.3K
Median P/S size$293.7K
Direct6
Indirect0
Oct 07, 2026exercise
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
No open-market purchases in available history
A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
5 observations · May 28, 2026 – Oct 7, 2026. Window ends at the latest available report, not today.
Selected observation · Oct 7, 2026805,559 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| May 28, 2026 | 895,559 | May 29, 2026 | View transaction |
| Jun 4, 2026 | 875,459 | Jun 5, 2026 | View transaction |
| Sep 2, 2026 | 775,559 | Sep 4, 2026 | View transaction |
| Oct 7, 2026 | 745,559 | Oct 9, 2026 | View transaction |
| Oct 7, 2026 | 805,559 | Oct 9, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
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 Oct 07, 2026 valued at $356,700.
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?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.