Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

WESTERN DIGITAL CORP

WDC · Nasdaq · CIK 0000106040 · Technology · Computer Hardware

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

227 Form 4 transaction lines observed in the same window
128 sales · 99 option, withholding, award, gift or other lines

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Tregillis Cynthia LChief Legal Officer & Corp Sec
○○▼○○▼▼○○▼
Tan IrvingChief Executive Officer
▼○○○○○○
Davis Brian ScottChief Sales & Mrktng Officer
○○○○○○
Gubbi Vidyadhara KChief of Global Operations
○○○○▼
Shihab Ahmed MohammedChief Product Officer
○○○○
STREETER STEPHANIE ADirector
▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot.—

Recent Form 4 activity

0Purchases
224Sales
190Other Form 4 lines
100SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING128 sale line(s) · context only
OTHER99 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
18,293,625
Previous report
17,280,387
Avg daily volume
7,454,522
Days to cover
2.5

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

414 transaction lines in the latest 365-day window; 880 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-20Tan IrvingOption exercise / conversion (M)Common Stock57USD 0.00USD 0SEC filing ↗
2026-09-20Tan IrvingTax withholding (F)Common Stock1,091USD 441.36USD 481,541SEC filing ↗
2026-09-20Davis Brian ScottOption exercise / conversion (M)Common Stock8USD 0.00USD 0SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-20Tan IrvingOption exercise / conversion (M)Common Stock57USD 0.00USD 0SEC filing ↗
2026-09-20Tan IrvingTax withholding (F)Common Stock1,091USD 441.36USD 481,541SEC filing ↗
2026-09-20Davis Brian ScottOption exercise / conversion (M)Common Stock8USD 0.00USD 0SEC filing ↗
2026-09-20Davis Brian ScottTax withholding (F)Common Stock963USD 441.36USD 425,043SEC filing ↗
2026-09-17Shihab Ahmed MohammedOption exercise / conversion (M)Common Stock56USD 0.00USD 0SEC filing ↗
2026-09-17Shihab Ahmed MohammedTax withholding (F)Common Stock5,150USD 423.87USD 2,182,930SEC filing ↗
2026-09-04Tregillis Cynthia LSale (S)Common Stock432USD 451.20USD 194,918SEC filing ↗
2026-09-04Gubbi Vidyadhara KSale (S)Common Stock1,795USD 459.87USD 825,467SEC filing ↗
2026-09-03Tregillis Cynthia LOption exercise / conversion (M)Common Stock7USD 0.00USD 0SEC filing ↗
2026-09-03Tregillis Cynthia LTax withholding (F)Common Stock700USD 441.57USD 309,099SEC filing ↗
2026-09-03Gubbi Vidyadhara KOption exercise / conversion (M)Common Stock14USD 0.00USD 0SEC filing ↗
2026-09-03Gubbi Vidyadhara KTax withholding (F)Common Stock1,764USD 441.57USD 778,929SEC filing ↗
2026-09-03Davis Brian ScottOption exercise / conversion (M)Common Stock7USD 0.00USD 0SEC filing ↗
2026-09-03Davis Brian ScottTax withholding (F)Common Stock882USD 441.57USD 389,465SEC filing ↗
2026-09-01Tan IrvingGift (G)Common Stock112,500USD 0.00USD 0SEC filing ↗
2026-09-01STREETER STEPHANIE ASale (S)Common Stock1,600USD 455.00USD 728,000SEC filing ↗
2026-08-31Tan IrvingJ (J)Common Stock112,500USD 0.00USD 0SEC filing ↗
2026-08-31STREETER STEPHANIE ASale (S)Common Stock4,000USD 447.82USD 1,791,280SEC filing ↗
2026-08-27Tregillis Cynthia LSale (S)Common Stock1,007USD 478.36USD 481,709SEC filing ↗
2026-08-26Tregillis Cynthia LSale (S)Common Stock476USD 450.78USD 214,571SEC filing ↗
2026-08-26Tregillis Cynthia LOption exercise / conversion (M)Common Stock9USD 0.00USD 0SEC filing ↗
2026-08-26Tregillis Cynthia LTax withholding (F)Common Stock1,631USD 468.88USD 764,743SEC filing ↗
2026-08-26Tan IrvingOption exercise / conversion (M)Common Stock42USD 0.00USD 0SEC filing ↗
2026-08-26Tan IrvingTax withholding (F)Common Stock3,314USD 468.88USD 1,553,868SEC filing ↗
2026-08-26Shihab Ahmed MohammedOption exercise / conversion (M)Common Stock15USD 0.00USD 0SEC filing ↗
2026-08-26Shihab Ahmed MohammedTax withholding (F)Common Stock2,741USD 468.88USD 1,285,200SEC filing ↗
2026-08-26Sennesael KrisOption exercise / conversion (M)Common Stock19USD 0.00USD 0SEC filing ↗
2026-08-26Sennesael KrisTax withholding (F)Common Stock4,317USD 468.88USD 2,024,155SEC filing ↗
2026-08-26Gubbi Vidyadhara KOption exercise / conversion (M)Common Stock9USD 0.00USD 0SEC filing ↗
2026-08-26Gubbi Vidyadhara KTax withholding (F)Common Stock2,056USD 468.88USD 964,017SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerWDC
CIK0000106040
SectorTechnology
IndustryComputer Hardware Yahoo Finance
SEC SIC3572 Computer Storage Devices
ExchangeNasdaq

Data coverage

Local Form 4 history880 transaction lines from 2020-01-07 to 2026-09-20
0 P purchase lines · 284 S sale lines · 596 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.