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

Sandisk Corp

SNDK · Nasdaq · CIK 0002023554 · Technology · Computer Hardware

INSIDER SIGNAL

No active buy signal

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

112 Form 4 transaction lines observed in the same window
74 sales · 38 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
Shek BernardChief Legal Officer and Secty
○○○▼○▼▼○○○▼○▼○○▼
Ilkbahar AlperEVP & Chief Technology Officer
○○○▼○○○○○○▼▼○
Goeckeler DavidChairman & CEO
○○○○○○○▼○▼
Visoso Luis FelipeEVP & CFO
○○○○▼○
Pokorny MichaelVP, Chief Accounting Officer
▼○○
Caulfield ThomasDirector
○
● Purchase▼ Sale○ Other

—

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
76Sales
74Other Form 4 lines
69SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING74 sale line(s) · context only
OTHER38 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
4,819,278
Previous report
5,618,213
Avg daily volume
8,938,814
Days to cover
≤ 1.0

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

150 transaction lines in the latest 365-day window; 205 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Shek BernardSale (S)Common Stock600USD 1,734.94USD 1,040,964SEC filing ↗
2026-09-20Shek BernardTax withholding (F)Common Stock118USD 1,791.82USD 211,435SEC filing ↗
2026-09-17Visoso Luis FelipeAward / grant (A)Common Stock1,635USD 0.00USD 0SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Shek BernardSale (S)Common Stock600USD 1,734.94USD 1,040,964SEC filing ↗
2026-09-20Shek BernardTax withholding (F)Common Stock118USD 1,791.82USD 211,435SEC filing ↗
2026-09-17Visoso Luis FelipeAward / grant (A)Common Stock1,635USD 0.00USD 0SEC filing ↗
2026-09-17Shek BernardAward / grant (A)Common Stock1,001USD 0.00USD 0SEC filing ↗
2026-09-17Pokorny MichaelAward / grant (A)Common Stock458USD 0.00USD 0SEC filing ↗
2026-09-17Ilkbahar AlperAward / grant (A)Common Stock1,619USD 0.00USD 0SEC filing ↗
2026-09-17Goeckeler DavidSale (S)Common Stock33,841USD 1,574.21USD 53,272,716SEC filing ↗
2026-09-17Goeckeler DavidAward / grant (A)Common Stock3,296USD 0.00USD 0SEC filing ↗
2026-09-15Visoso Luis FelipeSale (S)Common Stock1,000USD 1,568.83USD 1,568,830SEC filing ↗
2026-09-14Goeckeler DavidSale (S)Common Stock33,838USD 1,527.87USD 51,700,203SEC filing ↗
2026-09-08Shek BernardSale (S)Common Stock2,308USD 1,767.33USD 4,078,998SEC filing ↗
2026-09-03Visoso Luis FelipeTax withholding (F)Common Stock5,838USD 1,554.99USD 9,078,032SEC filing ↗
2026-09-03Shek BernardTax withholding (F)Common Stock2,271USD 1,554.99USD 3,531,382SEC filing ↗
2026-09-03Pokorny MichaelTax withholding (F)Common Stock1,283USD 1,554.99USD 1,995,052SEC filing ↗
2026-09-03Ilkbahar AlperSale (S)Common Stock400USD 1,563.89USD 625,556SEC filing ↗
2026-09-03Ilkbahar AlperSale (S)Common Stock4,712USD 1,540.57USD 7,259,185SEC filing ↗
2026-09-03Ilkbahar AlperTax withholding (F)Common Stock3,244USD 1,554.99USD 5,044,388SEC filing ↗
2026-09-03Goeckeler DavidTax withholding (F)Common Stock10,540USD 1,554.99USD 16,389,595SEC filing ↗
2026-09-01Shek BernardSale (S)Common Stock600USD 1,525.60USD 915,360SEC filing ↗
2026-08-25Shek BernardTax withholding (F)Common Stock212USD 1,480.77USD 313,923SEC filing ↗
2026-08-25Ilkbahar AlperTax withholding (F)Common Stock654USD 1,480.77USD 968,424SEC filing ↗
2026-08-25Goeckeler DavidTax withholding (F)Common Stock49,782USD 1,480.77USD 73,715,692SEC filing ↗
2026-08-21Visoso Luis FelipeTax withholding (F)Common Stock1,589USD 1,596.08USD 2,536,171SEC filing ↗
2026-08-21Shek BernardTax withholding (F)Common Stock108USD 1,596.08USD 172,377SEC filing ↗
2026-08-21Ilkbahar AlperTax withholding (F)Common Stock320USD 1,596.08USD 510,746SEC filing ↗
2026-08-21Goeckeler DavidTax withholding (F)Common Stock1,033USD 1,596.08USD 1,648,751SEC filing ↗
2026-08-20Visoso Luis FelipeTax withholding (F)Common Stock25,655USD 1,600.62USD 41,063,906SEC filing ↗
2026-08-20Shek BernardTax withholding (F)Common Stock111USD 1,600.62USD 177,669SEC filing ↗
2026-08-20Ilkbahar AlperOption exercise / conversion (M)Common Stock276USD 0.00USD 0SEC filing ↗
2026-08-20Ilkbahar AlperTax withholding (F)Common Stock439USD 1,600.62USD 702,672SEC 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 · —
TickerSNDK
CIK0002023554
SectorTechnology
IndustryComputer Hardware Yahoo Finance
SEC SIC3572 Computer Storage Devices
ExchangeNasdaq

Data coverage

Local Form 4 history205 transaction lines from 2025-02-13 to 2026-10-01
0 P purchase lines · 76 S sale lines · 129 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.