Reporting owner · CIK 0000938071

Duffield David A

SEC Form 4 history across 1 companies, 77 transactions and 9 filings.

10%Workday, Inc.
Open-market transaction mix0% buys0 buys · 59 sales
Latest filingOct 13, 2026, 10:03 PM

Available history · Sep 04, 2026 – Oct 09, 2026

Filings9Form 4 records
Buying$00 purchases
Selling$167.1M59 sales
Net value−$167.1MBuys minus sells · disclosed values

Latest insider transactions

Form 4 filings from available history.
Duffield David A transactions · 20 per page
CompanyInsiderActivityDisclosed valueFiled (ET)
WDAYWorkday, Inc.
Duffield David A10%C · unknown10b5-1 detectedDerivative securitySEC filing ↗$0View disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$286kView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$1.99MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$2.41MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$2.67MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$2.67MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$8.68MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%C · unknown10b5-1 detectedSEC filing ↗$0View disclosure →
WDAYWorkday, Inc.
Duffield David A10%C · unknown10b5-1 detectedDerivative securitySEC filing ↗$0View disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$2.00MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$3.68MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$1.88MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$8.58MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$1.91MView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$517kView disclosure →
WDAYWorkday, Inc.
Duffield David A10%C · unknown10b5-1 detectedSEC filing ↗$0View disclosure →
WDAYWorkday, Inc.
Duffield David A10%C · unknown10b5-1 detectedDerivative securitySEC filing ↗$0View disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$292kView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$892kView disclosure →
WDAYWorkday, Inc.
Duffield David A10%S · sale10b5-1 detectedSEC filing ↗-$115kView 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 Workday, Inc. on Oct 09, 2026 valued at $286,825.

Review SEC filing
Latest buy

No open-market insider purchase is available.

Monthly open-market activity

Last 2 reported months · purchases and sales

View exact monthly values
MonthPurchasesSalesBuy valueSale valueNet value
Sep 2026036$0.00$111,346,168.01-$111,346,168.01
Oct 2026023$0.00$55,726,911.73-$55,726,911.73

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$2.8M
Median P/S size$1.9M
Direct77
Indirect0
Oct 09, 2026unknown

Filing-only signals

Deterministic matches in this insider's history

Cluster Sellingpattern6Derivative Transactionfiling-context6Direct Ownershipfiling-context53Large Holdings Increaseholdings6Large Holdings Reductionholdings6Large Salesize21Repeat Sellerpattern4110b5-1 Detectedfiling-context53

Associated companies

Companies in the disclosed reporting history

Workday, Inc.WDAY · 161 transactions · latest Oct 13, 2026, 10:03 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.

68 observations · Sep 4, 2026 – Oct 9, 2026. Window ends at the latest available report, not today.

Selected observation · Oct 9, 2026105,049 shares reported
Inspect transaction
View exact observations and source transactions
Transaction dateShares held afterFiledSource
Sep 4, 2026195,664Sep 9, 2026View transaction
Sep 4, 2026181,998Sep 9, 2026View transaction
Sep 4, 2026175,757Sep 9, 2026View transaction
Sep 4, 2026144,152Sep 9, 2026View transaction
Sep 4, 2026114,104Sep 9, 2026View transaction
Sep 4, 2026106,473Sep 9, 2026View transaction
Sep 4, 2026106,249Sep 9, 2026View transaction
Sep 4, 2026105,649Sep 9, 2026View transaction
Sep 4, 2026105,049Sep 9, 2026View transaction
Sep 10, 2026205,829Sep 14, 2026View transaction
Sep 10, 2026177,946Sep 14, 2026View transaction
Sep 10, 2026154,395Sep 14, 2026View transaction
Sep 10, 2026129,930Sep 14, 2026View transaction
Sep 10, 2026107,542Sep 14, 2026View transaction
Sep 10, 2026105,049Sep 14, 2026View transaction
Sep 15, 2026201,594Sep 17, 2026View transaction
Sep 15, 2026176,431Sep 17, 2026View transaction
Sep 15, 2026158,944Sep 17, 2026View transaction
Sep 15, 2026132,792Sep 17, 2026View transaction
Sep 15, 2026108,917Sep 17, 2026View transaction
Sep 15, 2026105,049Sep 17, 2026View transaction
Sep 18, 2026199,138Sep 21, 2026View transaction
Sep 18, 2026164,279Sep 21, 2026View transaction
Sep 18, 2026117,078Sep 21, 2026View transaction
Sep 18, 2026105,049Sep 21, 2026View transaction
Sep 23, 2026204,662Sep 25, 2026View transaction
Sep 23, 2026202,338Sep 25, 2026View transaction
Sep 23, 2026200,562Sep 25, 2026View transaction
Sep 23, 2026195,713Sep 25, 2026View transaction
Sep 23, 2026131,858Sep 25, 2026View transaction
Sep 23, 2026106,924Sep 25, 2026View transaction
Sep 23, 2026105,049Sep 25, 2026View transaction
Sep 28, 2026204,020Sep 30, 2026View transaction
Sep 28, 2026202,020Sep 30, 2026View transaction
Sep 28, 2026198,524Sep 30, 2026View transaction
Sep 28, 2026196,620Sep 30, 2026View transaction
Sep 28, 2026194,920Sep 30, 2026View transaction
Sep 28, 2026193,820Sep 30, 2026View transaction
Sep 28, 2026170,041Sep 30, 2026View transaction
Sep 28, 2026132,048Sep 30, 2026View transaction
Sep 28, 2026108,953Sep 30, 2026View transaction
Sep 28, 2026105,049Sep 30, 2026View transaction
Oct 1, 2026203,495Oct 5, 2026View transaction
Oct 1, 2026198,195Oct 5, 2026View transaction
Oct 1, 2026189,160Oct 5, 2026View transaction
Oct 1, 2026174,994Oct 5, 2026View transaction
Oct 1, 2026126,022Oct 5, 2026View transaction
Oct 1, 2026121,258Oct 5, 2026View transaction
Oct 1, 2026119,449Oct 5, 2026View transaction
Oct 1, 2026115,649Oct 5, 2026View transaction
Oct 1, 2026111,749Oct 5, 2026View transaction
Oct 1, 2026111,149Oct 5, 2026View transaction
Oct 1, 2026106,549Oct 5, 2026View transaction
Oct 1, 2026105,049Oct 5, 2026View transaction
Oct 6, 2026204,277Oct 7, 2026View transaction
Oct 6, 2026201,477Oct 7, 2026View transaction
Oct 6, 2026191,193Oct 7, 2026View transaction
Oct 6, 2026145,209Oct 7, 2026View transaction
Oct 6, 2026135,155Oct 7, 2026View transaction
Oct 6, 2026115,621Oct 7, 2026View transaction
Oct 6, 2026105,049Oct 7, 2026View transaction
Oct 9, 2026204,884Oct 13, 2026View transaction
Oct 9, 2026158,277Oct 13, 2026View transaction
Oct 9, 2026143,983Oct 13, 2026View transaction
Oct 9, 2026129,755Oct 13, 2026View transaction
Oct 9, 2026117,023Oct 13, 2026View transaction
Oct 9, 2026106,551Oct 13, 2026View transaction
Oct 9, 2026105,049Oct 13, 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.

Duffield David A Insider Activity FAQ

SEC Form 4 context

Who is Duffield David A?

Duffield David A is a reporting owner in SEC Form 4 filings with reporting owner CIK 0000938071.

Which companies has Duffield David A reported transactions for?

Workday, Inc.

When was Duffield David A's latest insider buy?

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

When was Duffield David A's latest insider sale?

sale at Workday, Inc. on Oct 09, 2026 valued at $286,825.

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.