Total buying$00 buys
MASS
908 Devices Inc.
NasdaqIndustrialsLaboratory Analytical Instruments
Insider activity for last month from 09/20 to 10/20.
How these metrics are calculated
Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total selling$913k5 sells
Net open-market−$913kBuying minus selling
Active insiders3Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Oct 09, 2026
Open-market transaction mix · 5 transactions in the selected period
Code A includes awards, grants and other acquisitions; these are not open-market buys. A rolling period can include partial calendar months.
View exact monthly counts and disclosed values
| Month | Buys | Sells | Awards (A) | Buy value | Sell value | Net P/S value |
|---|---|---|---|---|---|---|
| Sep 2026 | 0 | 3 | 0 | $0 | $491k | -$491k |
| Oct 2026 | 0 | 2 | 0 | $0 | $421k | -$421k |
Distinct insiders active
Reporting-owner CIKs by month · peak Oct 2026 (2)Sep 2026Oct 2026
Largest insider activity
By absolute net disclosed value · current transaction page- AI-$491.2k
- BD-$251.7k
- GI-$65.2k
MASS transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.| 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. | Griffith Joseph H. IVCFO | S · sale10b5-1 detectedSEC filing ↗ | -$65.1kView disclosure → | |
MASS908 Devices Inc. | Awm Investment Company, Inc.10% | S · saleSEC filing ↗ | -$207kView disclosure → | |
MASS908 Devices Inc. | Awm Investment Company, Inc.10% | S · saleSEC filing ↗ | -$272kView disclosure → | |
MASS908 Devices Inc. | Awm Investment Company, Inc.10% | S · saleSEC filing ↗ | -$11.2kView disclosure → |
Filing-only signals
Deterministic matches in the selected period
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period7transactionstxns
- S · Open-market sells · dominant5 · 71%
- M · Option exercise2 · 29%
Activity by reported role
A joint filing can contribute to multiple roles10% owner3
Director3
Chief financial officer1
Reported Holdings After
Separated by insider, security, and ownership type
Awm Investment Company, Inc.Common Stock · Indirect · By Limited Partnership
4,736,773Sep 29, 2026
Brown Christopher D.Common Stock · Direct
805,559Oct 07, 2026
Awm Investment Company, Inc.Common Stock · Indirect · By Limited Partnershp
4,755,773Sep 23, 2026
Griffith Joseph H. IVCommon Stock · Direct
116,497Oct 06, 2026
Brown Christopher D.Stock Option (option to buy) · Direct
54,318Oct 07, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Current transaction page only · each cell is a filing date · buys green, sells redSep 20 → Oct 20
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908 Devices Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at 908 Devices Inc.?
Brown Christopher D., Griffith Joseph H. IV, AWM Investment Company, Inc..
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Brown Christopher D. reported a sale on Oct 07, 2026 valued at $356k. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $913,047.80. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.