About 10% overall. As a group they still hold 74% of their starting shares.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Bernard Shek Chief Legal Officer and Secty | 600 | $1734.94 | 2.3% | 26K | Oct 1, 2026 | Oct 2, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Bernard Shek Chief Legal Officer and Secty | 118 | $1791.82 | 0.4% | 26K | Sep 20, 2026 | Sep 21, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| David Goeckeler Chairman & CEO, Director | 33,841 | $1574.21 | 8.1% | 383K | Sep 17, 2026 | Sep 21, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Luis Visoso EVP & CFO | 1,000 | $1568.83 | 0.8% | 131K | Sep 15, 2026 | Sep 16, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| David Goeckeler Chairman & CEO, Director | 33,838 | $1527.87 | 7.6% | 413K | Sep 14, 2026 | Sep 16, 2026 |
"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
Percentages cover 11 of 12 officers and directors. Left out: Alexander Bradley (held no vested shares at the start). Disclosed company stock is not an insider's whole wealth.
Officers and directors, past 12 months. Each bar is the insider's vested stake at the start of the period (Oct 8, 2025). The gold part is what they sold.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
WESTERN DIGITAL CORP reported no open-market sales in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. David Goeckeler sold 68K shares ($105M, 13% of starting holdings) in the past 12 months, all of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 92% of sales by value ran under 10b5-1 trading plans disclosed in the filings, 2% were to cover taxes and 6% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
About 10% overall. As a group they still hold 74% of their starting shares. That covers the 12 months to Oct 8, 2026 and counts vested shares reported on SEC Forms 3, 4 and 5, which is not an insider's whole wealth.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| David Goeckeler Chairman & CEO, Director | $105M 68K shares | 13% | Disclosed plan |
| Alper Ilkbahar EVP & Chief Technology Officer | $11.4M 7.1K shares | 12% | 69% under a disclosed plan |
| Bernard Shek Chief Legal Officer and Secty | $9.0M 5.3K shares | 15% | Disclosed plan |
| Michael Pokorny VP, Chief Accounting Officer | $3.5M 2.4K shares | 9.0% | No plan disclosed |
| Miyuki Suzuki Director | $2.2M 3.5K shares | 24% | No plan disclosed |
| Luis Visoso EVP & CFO | $1.6M 1K shares | 0.6% | Disclosed plan |
| Necip Sayiner Director | $1.1M 1.9K shares | 49% | No plan disclosed |
Outside holder, reported separately: WESTERN DIGITAL CORP (a 10% owner, not part of management). No open-market sales reported in the period. Holds 7.51M shares. Latest filing
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 8, 2025 | Sold | Held Oct 8, 2026 | Still held | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| David Goeckeler Chairman & CEO, Director | 522K | −68K | 383K | 73% | ||||||||
| Luis Visoso EVP & CFO | 170K | −1K | 133K | 78% | ||||||||
Alper IlkbahariIncludes unvested RSUs, amount not disclosed. EVP & Chief Technology Officer | 60K | −7.1K | 42K | 70% | ||||||||
Vesting, gifts, unvested awards and holding lines for Alper Ilkbahar+276shares vested or exercised −2.7Kgifted (net of own trusts) −10Kwithheld by the company for taxes 149K → 149Kunvested awards, start → end
| ||||||||||||
Bernard ShekiIncludes unvested RSUs, amount not disclosed. Chief Legal Officer and Secty | 35K | −5.3K | 26K | 74% | ||||||||
Vesting, gifts, unvested awards and holding lines for Bernard Shek | ||||||||||||
Michael PokornyiIncludes unvested RSUs, amount not disclosed. VP, Chief Accounting Officer | 27K | −2.4K | 22K | 80% | ||||||||
Vesting, gifts, unvested awards and holding lines for Michael Pokorny | ||||||||||||
| Thomas Caulfield Director | 16K | 0 | 7.1K | no sales | ||||||||
| Miyuki Suzuki Director | 15K | −3.5K | 9.9K | 68% | ||||||||
| Richard Cassidy II Director | 3.8K | 0 | 4.9K | no sales | ||||||||
Devinder KumariMinor difference of 19 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Director | 3.8K | 0 | 4.8K | no sales | ||||||||
Vesting, gifts, unvested awards and holding lines for Devinder Kumar0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end Reconciliation: minor difference of 19 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). | ||||||||||||
| Necip Sayiner Director | 3.8K | −1.9K | 2.9K | 77% | ||||||||
| Ellyn Shook Director | 3.8K | 0 | 4.8K | no sales | ||||||||
| Alexander Bradley Director | 0 | 0 | 863 | no sales | ||||||||
Vesting, gifts, unvested awards and holding lines for Alexander Bradley0shares vested or exercised 0gifted (net of own trusts) none reportedunvested awards, start → end
| ||||||||||||
12 of 12 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (11 exactly, 1 with a minor or footnoted difference). Percentages cover 11 of 12 officers and directors. Left out: Alexander Bradley (held no vested shares at the start). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.
Officer and director open-market sales: $134M across 88,895 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($10.3M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $3.5M of it is Alper Ilkbahar. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Michael Pokorny, May 12, 2026
$2.2M of sales (1.6%) cite tax obligations in their footnotes. Separately, 132,938 shares ($182M) were withheld by the company for taxes, which isn't a market sale. Example: Miyuki Suzuki, Feb 25, 2026
Gifts the filings describe as charitable. Gifts are not sales and are not included in the sale totals.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| David Goeckeler Chairman & CEO, Director | 68K | $105M | 100% | 78% | Sep 14, 2026 to Sep 17, 2026 |
| Alper Ilkbahar EVP & Chief Technology Officer | 7.1K | $11.4M | 69% | 9% | Jun 1, 2026 to Sep 3, 2026 |
| Bernard Shek Chief Legal Officer and Secty | 5.3K | $9.0M | 100% | 7% | Jun 3, 2026 to Oct 1, 2026 |
| Michael Pokorny VP, Chief Accounting Officer | 2.4K | $3.5M | 0% | 3% | May 12, 2026 to May 12, 2026 |
| Miyuki Suzuki Director | 3.5K | $2.2M | 0% | 2% | Feb 25, 2026 to Feb 25, 2026 |
| Luis Visoso EVP & CFO | 1K | $1.6M | 100% | 1% | Sep 15, 2026 to Sep 15, 2026 |
| Necip Sayiner Director | 1.9K | $1.1M | 0% | 0.8% | Dec 3, 2025 to May 8, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $248K | $0 | $0 | $248K |
| Jan 2026 | $0 | $0 | $0 | $0 |
| Feb 2026 | $2.2M | $0 | $2.2M | $0 |
| Mar 2026 | $0 | $0 | $0 | $0 |
| Apr 2026 | $0 | $0 | $0 | $0 |
| May 2026 | $4.4M | $0 | $0 | $4.4M |
| Jun 2026 | $4.6M | $1.0M | $0 | $3.5M |
| Jul 2026 | $1.3M | $1.3M | $0 | $0 |
| Aug 2026 | $697K | $697K | $0 | $0 |
| Sep 2026 | $119M | $119M | $0 | $0 |
| Oct 2026 | $1.0M | $1.0M | $0 | $0 |
Not enough history to compare: fewer than three earlier years of filings.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 8, 2026 Latest 12 months | 89K | 7 | $134M |
| Oct 8, 2025 1 year earlier · filings don't cover the whole year | n/a | n/a | n/a |
| Oct 8, 2024 2 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
| Oct 9, 2023 3 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
| Oct 9, 2022 4 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
| Oct 9, 2021 5 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Every officer and director reconciles for this period.
Devinder Kumar: minor difference of 19 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 131 Forms 3, 4 and 5 filed for Sandisk Corp (SEC CIK 2023554) from Jan 31, 2025 to Oct 2, 2026, retrieved from SEC EDGAR on Oct 8, 2026. Prices are the ones reported in each filing, often weighted averages.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
| Name | Last filed | Last reported balance |
|---|---|---|
| Kimberly Alexy | Mar 4, 2025 | 13,975 shares, last reported balance as of Mar 3, 2025 |
| Matthew Massengill | Mar 4, 2025 | 17,314 shares, last reported balance as of Mar 3, 2025 |