Reporting owner · CIK 0001388390

Mosley William D

SEC Form 4 history across 1 companies, 96 transactions and 6 filings.

CEOCEOSeagate Technology Holdings plc
Open-market transaction mix0% buys0 buys · 76 sales
Latest filingOct 02, 2026, 08:07 PM

Available history · Aug 20, 2026 – Oct 01, 2026

Filings6Form 4 records
Buying$00 purchases
Selling$145.6M76 sales
Net value−$145.6MBuys minus sells · disclosed values

Latest insider transactions

Form 4 filings from available history.
Mosley William D transactions · 20 per page
CompanyInsiderActivityDisclosed valueFiled (ET)
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$591kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$702kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$738kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$857kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$579kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$772kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$845kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$366kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$439kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$878kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$826kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$635kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$1.04MView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$764kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$279kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$933kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$508kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$544kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$434kView disclosure →
STXSeagate Technology Holdings plc
Mosley William DCEOS · sale10b5-1 detectedSEC filing ↗-$434kView disclosure →
Open a transaction for shares, transaction date, ownership and the original SEC filing.

Latest Form 4 facts

Quick context from source filings

Latest open-market transaction

sale at Seagate Technology Holdings plc on Oct 01, 2026 valued at $910,023.

Review SEC filing
Latest buy

No open-market insider purchase is available.

Latest sale

sale at Seagate Technology Holdings plc on Oct 01, 2026 valued at $910,023.

Review SEC filing

Monthly open-market activity

Last 3 reported months · purchases and sales

View exact monthly values
MonthPurchasesSalesBuy valueSale valueNet value
Aug 202603$0.00$15,406,022.04-$15,406,022.04
Sep 2026029$0.00$102,529,237.27-$102,529,237.27
Oct 2026044$0.00$27,670,452.17-$27,670,452.17

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$1.9M
Median P/S size$689.2K
Direct96
Indirect0
Oct 01, 2026sale

Filing-only signals

Deterministic matches in this insider's history

Cluster Sellingpattern47Derivative Transactionfiling-context8Direct Ownershipfiling-context59Large Holdings Increaseholdings4Large Holdings Reductionholdings1Large Salesize6Repeat Sellerpattern4610b5-1 Detectedfiling-context46

Associated companies

Companies in the disclosed reporting history

Seagate Technology Holdings plcSTX · 134 transactions · latest Oct 02, 2026, 08:07 PM

Open-market buy performance

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

90d forward
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.

84 observations · Aug 20, 2026 – Oct 1, 2026. Window ends at the latest available report, not today.

Selected observation · Oct 1, 2026362108.250000 shares reported
Inspect transaction
View exact observations and source transactions
Transaction dateShares held afterFiledSource
Aug 20, 2026301,921Aug 24, 2026View transaction
Aug 20, 2026319548.250000Aug 24, 2026View transaction
Aug 20, 2026314560.250000Aug 24, 2026View transaction
Aug 21, 2026298483.250000Aug 24, 2026View transaction
Aug 21, 2026308240.250000Aug 24, 2026View transaction
Aug 21, 2026311167.500000Aug 24, 2026View transaction
Sep 1, 2026325167.500000Sep 3, 2026View transaction
Sep 1, 2026324810.500000Sep 3, 2026View transaction
Sep 1, 2026324650.500000Sep 3, 2026View transaction
Sep 1, 2026324490.500000Sep 3, 2026View transaction
Sep 1, 2026323530.500000Sep 3, 2026View transaction
Sep 1, 2026322370.500000Sep 3, 2026View transaction
Sep 1, 2026321265.500000Sep 3, 2026View transaction
Sep 1, 2026319687.500000Sep 3, 2026View transaction
Sep 1, 2026318487.500000Sep 3, 2026View transaction
Sep 1, 2026316447.500000Sep 3, 2026View transaction
Sep 1, 2026313569.500000Sep 3, 2026View transaction
Sep 1, 2026309014.500000Sep 3, 2026View transaction
Sep 1, 2026304727.500000Sep 3, 2026View transaction
Sep 1, 2026302647.500000Sep 3, 2026View transaction
Sep 1, 2026301607.500000Sep 3, 2026View transaction
Sep 1, 2026300287.500000Sep 3, 2026View transaction
Sep 1, 2026299367.500000Sep 3, 2026View transaction
Sep 1, 2026298887.500000Sep 3, 2026View transaction
Sep 1, 2026298287.500000Sep 3, 2026View transaction
Sep 1, 2026297047.500000Sep 3, 2026View transaction
Sep 1, 2026296447.500000Sep 3, 2026View transaction
Sep 1, 2026295867.500000Sep 3, 2026View transaction
Sep 1, 2026295527.500000Sep 3, 2026View transaction
Sep 1, 2026295407.500000Sep 3, 2026View transaction
Sep 1, 2026295327.500000Sep 3, 2026View transaction
Sep 1, 2026295247.500000Sep 3, 2026View transaction
Sep 1, 2026295167.500000Sep 3, 2026View transaction
Sep 9, 2026297982.500000Sep 11, 2026View transaction
Sep 9, 2026298,864Sep 11, 2026View transaction
Sep 10, 2026296,449Sep 11, 2026View transaction
Sep 10, 2026297548.250000Sep 11, 2026View transaction
Sep 14, 2026475997.500000Sep 16, 2026View transaction
Sep 15, 2026378108.250000Sep 16, 2026View transaction
Oct 1, 2026392108.250000Oct 2, 2026View transaction
Oct 1, 2026391748.250000Oct 2, 2026View transaction
Oct 1, 2026391231.250000Oct 2, 2026View transaction
Oct 1, 2026390791.250000Oct 2, 2026View transaction
Oct 1, 2026390407.250000Oct 2, 2026View transaction
Oct 1, 2026389711.250000Oct 2, 2026View transaction
Oct 1, 2026389231.250000Oct 2, 2026View transaction
Oct 1, 2026388751.250000Oct 2, 2026View transaction
Oct 1, 2026388150.250000Oct 2, 2026View transaction
Oct 1, 2026387590.250000Oct 2, 2026View transaction
Oct 1, 2026386563.250000Oct 2, 2026View transaction
Oct 1, 2026386256.250000Oct 2, 2026View transaction
Oct 1, 2026385416.250000Oct 2, 2026View transaction
Oct 1, 2026384270.250000Oct 2, 2026View transaction
Oct 1, 2026383574.250000Oct 2, 2026View transaction
Oct 1, 2026382670.250000Oct 2, 2026View transaction
Oct 1, 2026381710.250000Oct 2, 2026View transaction
Oct 1, 2026381230.250000Oct 2, 2026View transaction
Oct 1, 2026380830.250000Oct 2, 2026View transaction
Oct 1, 2026379910.250000Oct 2, 2026View transaction
Oct 1, 2026379070.250000Oct 2, 2026View transaction
Oct 1, 2026378440.250000Oct 2, 2026View transaction
Oct 1, 2026377510.250000Oct 2, 2026View transaction
Oct 1, 2026376710.250000Oct 2, 2026View transaction
Oct 1, 2026375950.250000Oct 2, 2026View transaction
Oct 1, 2026375310.250000Oct 2, 2026View transaction
Oct 1, 2026374230.250000Oct 2, 2026View transaction
Oct 1, 2026373750.250000Oct 2, 2026View transaction
Oct 1, 2026373110.250000Oct 2, 2026View transaction
Oct 1, 2026372750.250000Oct 2, 2026View transaction
Oct 1, 2026371895.250000Oct 2, 2026View transaction
Oct 1, 2026370230.250000Oct 2, 2026View transaction
Oct 1, 2026368910.250000Oct 2, 2026View transaction
Oct 1, 2026368070.250000Oct 2, 2026View transaction
Oct 1, 2026367248.250000Oct 2, 2026View transaction
Oct 1, 2026366608.250000Oct 2, 2026View transaction
Oct 1, 2026365849.250000Oct 2, 2026View transaction
Oct 1, 2026365270.250000Oct 2, 2026View transaction
Oct 1, 2026364630.250000Oct 2, 2026View transaction
Oct 1, 2026363910.250000Oct 2, 2026View transaction
Oct 1, 2026363830.250000Oct 2, 2026View transaction
Oct 1, 2026363790.250000Oct 2, 2026View transaction
Oct 1, 2026363510.250000Oct 2, 2026View transaction
Oct 1, 2026363070.250000Oct 2, 2026View transaction
Oct 1, 2026362108.250000Oct 2, 2026View 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.

Mosley William D Insider Activity FAQ

SEC Form 4 context

Who is Mosley William D?

Mosley William D is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001388390.

Which companies has Mosley William D reported transactions for?

Seagate Technology Holdings plc

When was Mosley William D's latest insider buy?

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

When was Mosley William D's latest insider sale?

sale at Seagate Technology Holdings plc on Oct 01, 2026 valued at $910,023.

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.