Total buying$00 buys
STX
Seagate Technology Holdings plc
NasdaqTechnologyComputer Storage Devices
Insider activity for last month from 09/19 to 10/19.
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$35.8M70 sells
Net open-market−$35.8MBuying minus selling
Active insiders2Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Oct 02, 2026
Open-market transaction mix · 70 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 | 26 | 0 | $0 | $8.21M | -$8.21M |
| Oct 2026 | 0 | 44 | 0 | $0 | $27.6M | -$27.6M |
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (1)Sep 2026Oct 2026
Largest insider activity
By absolute net disclosed value · current transaction page- MD-$12.3M
STX transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$910kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$415kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$264kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$37.6kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$75.2kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$676kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$600kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$542kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$710kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$598kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$768kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$783kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$1.23MView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$1.55MView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$795kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$334kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | M · exercise10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$593kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$444kView disclosure → | |
STXSeagate Technology Holdings plc | Mosley William DCEO | S · sale10b5-1 detectedSEC filing ↗ | -$999kView 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 period74transactionstxns
- S · Open-market sells · dominant70 · 95%
- M · Option exercise4 · 5%
Activity by reported role
A joint filing can contribute to multiple rolesChief executive officer46
CTO28
EVP28
Reported Holdings After
Separated by insider, security, and ownership type
Mosley William DOrdinary Shares · Direct
362,108.25Oct 01, 2026
Morris John ChristopherOrdinary Shares · Direct
22,693.25Sep 21, 2026
Morris John ChristopherNQ Stock Option · Direct
17,378Sep 21, 2026
Mosley William DNQ Options · Direct
83,100Oct 01, 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 19 → Oct 19
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Seagate Technology Holdings plc Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Seagate Technology Holdings plc?
MOSLEY WILLIAM D, Morris John Christopher.
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?
Mosley William D reported a sale on Oct 01, 2026 valued at $910k. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $35,882,402.87. 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.