Transactions
27
Insider / Sandisk Corp
Shek Bernard
Chief Legal Officer and Secty at Sandisk Corp
- Company
- Sandisk Corp
- Ticker
- SNDK
- First filing on record
- October 21, 2025
- Latest trade on record
- October 1, 2026
- SEC filings
- EDGAR ↗
Shek Bernard, Chief Legal Officer and Secty at Sandisk Corp, has disclosed 27 transactions in SNDK since October 21, 2025: 0 purchases (0 open-market buys) and 26 sales, worth about $14.9M at the reported prices. The latest was filed October 2, 2026, 1 day after the trade; 1 filing was late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
26
Avg. disclosure lag
2.2d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Shek Bernard made no purchases and 25 sales worth $15M, plus 1 other transaction. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Shek Bernard has traded 1 stock on record; the largest by dollars is SNDK.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
1 of 21 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| F | Shares withheld for tax | 20 | 4,897 | $5.9M |
| S | Open-market sale | 6 | 5,308 | $9.0M |
| A | Grant or award | 1 | 1,001 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 22 | 0 | 21 · $14.7M |
| 2025 | 5 | 0 | 5 · $171K |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| SNDK | Sell S | October 1, 2026 | October 2, 2026 | 1d | 600 | $1,735 | $1.0M | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell F | September 20, 2026 | September 21, 2026 | 1d | 118 | $1,792 | $211K | Form 4 ↗ | ||
| SNDK | Other A | September 17, 2026 | September 21, 2026 | 4d | 1,001 | — | — | Form 4 ↗ | ||
| SNDK | Sell S | September 8, 2026 | September 8, 2026 | 0d | 2,308 | $1,767 | $4.1M | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell F | September 3, 2026 | September 8, 2026 | 5d | 2,271 | $1,555 | $3.5M | late10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell S | September 1, 2026 | September 2, 2026 | 1d | 600 | $1,526 | $915K | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell F | August 25, 2026 | August 27, 2026 | 2d | 212 | $1,481 | $314K | Form 4 ↗ | ||
| SNDK | Sell F | August 21, 2026 | August 24, 2026 | 3d | 108 | $1,596 | $172K | Form 4 ↗ | ||
| SNDK | Sell F | August 20, 2026 | August 24, 2026 | 4d | 111 | $1,601 | $178K | Form 4 ↗ | ||
| SNDK | Sell S | August 3, 2026 | August 4, 2026 | 1d | 600 | $1,162 | $697K | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell S | July 1, 2026 | July 2, 2026 | 1d | 600 | $2,088 | $1.3M | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell F | June 20, 2026 | June 22, 2026 | 2d | 117 | $2,185 | $256K | Form 4 ↗ | ||
| SNDK | Sell S | June 3, 2026 | June 5, 2026 | 2d | 600 | $1,736 | $1.0M | 10b5-1 plan | Form 4 ↗ | |
| SNDK | Sell F | May 25, 2026 | May 27, 2026 | 2d | 211 | $1,479 | $312K | Form 4 ↗ | ||
| SNDK | Sell F | May 21, 2026 | May 22, 2026 | 1d | 107 | $1,542 | $165K | Form 4 ↗ | ||
| SNDK | Sell F | May 20, 2026 | May 22, 2026 | 2d | 109 | $1,393 | $152K | Form 4 ↗ | ||
| SNDK | Sell F | April 20, 2026 | April 21, 2026 | 1d | 41 | $913 | $37K | Form 4 ↗ | ||
| SNDK | Sell F | March 20, 2026 | March 24, 2026 | 4d | 117 | $710 | $83K | Form 4 ↗ | ||
| SNDK | Sell F | February 25, 2026 | February 27, 2026 | 2d | 211 | $632 | $133K | Form 4 ↗ | ||
| SNDK | Sell F | February 21, 2026 | February 24, 2026 | 3d | 107 | $650 | $70K | Form 4 ↗ | ||
| SNDK | Sell F | February 20, 2026 | February 24, 2026 | 4d | 117 | $650 | $76K | Form 4 ↗ | ||
| SNDK | Sell F | January 20, 2026 | January 21, 2026 | 1d | 34 | $453 | $15K | Form 4 ↗ | ||
| SNDK | Sell F | December 20, 2025 | December 23, 2025 | 3d | 117 | $238 | $28K | Form 4 ↗ | ||
| SNDK | Sell F | November 25, 2025 | November 26, 2025 | 1d | 211 | $221 | $47K | Form 4 ↗ | ||
| SNDK | Sell F | November 21, 2025 | November 24, 2025 | 3d | 107 | $200 | $21K | Form 4 ↗ | ||
| SNDK | Sell F | November 20, 2025 | November 24, 2025 | 4d | 109 | $196 | $21K | Form 4 ↗ | ||
| SNDK | Sell F | October 20, 2025 | October 21, 2025 | 1d | 362 | $148 | $54K | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| October 2, 2026 | Form 4 | 0001242648-26-000045 | 1 | published | EDGAR ↗ |
| September 21, 2026 | Form 4 | 0001242648-26-000040 | 2 | published | EDGAR ↗ |
| September 8, 2026 | Form 4 | 0001242648-26-000027 | 2 | published | EDGAR ↗ |
| September 2, 2026 | Form 4 | 0001363249-26-000074 | 1 | published | EDGAR ↗ |
| August 27, 2026 | Form 4 | 0001363249-26-000072 | 1 | published | EDGAR ↗ |
| August 24, 2026 | Form 4 | 0001363249-26-000063 | 2 | published | EDGAR ↗ |
| August 4, 2026 | Form 4 | 0001363249-26-000058 | 1 | published | EDGAR ↗ |
| July 2, 2026 | Form 4 | 0001363249-26-000056 | 1 | published | EDGAR ↗ |
| June 22, 2026 | Form 4 | 0001363249-26-000054 | 1 | published | EDGAR ↗ |
| June 5, 2026 | Form 4 | 0001363249-26-000052 | 1 | published | EDGAR ↗ |
| May 27, 2026 | Form 4 | 0001363249-26-000046 | 1 | published | EDGAR ↗ |
| May 22, 2026 | Form 4 | 0001363249-26-000039 | 2 | published | EDGAR ↗ |
| April 21, 2026 | Form 4 | 0001363249-26-000024 | 1 | published | EDGAR ↗ |
| March 24, 2026 | Form 4 | 0001363249-26-000020 | 1 | published | EDGAR ↗ |
| February 27, 2026 | Form 4 | 0001242648-26-000016 | 1 | published | EDGAR ↗ |
| February 24, 2026 | Form 4 | 0001242648-26-000007 | 2 | published | EDGAR ↗ |
| January 21, 2026 | Form 4 | 0001363249-26-000006 | 1 | published | EDGAR ↗ |
| December 23, 2025 | Form 4 | 0001363249-25-000135 | 1 | published | EDGAR ↗ |
| November 26, 2025 | Form 4 | 0001363249-25-000133 | 1 | published | EDGAR ↗ |
| November 24, 2025 | Form 4 | 0001363249-25-000126 | 2 | published | EDGAR ↗ |
| October 21, 2025 | Form 4 | 0001363249-25-000106 | 1 | published | EDGAR ↗ |
Other insiders at Sandisk Corp
- Ilkbahar Alper EVP & Chief Technology Officer 56 rows
- Goeckeler David Chairman & CEO 43 rows
- Bradley Alexander R. Chief Financial Officer 27 rows
- Visoso Luis Felipe EVP & CFO 8 rows
- Suzuki Miyuki Director 7 rows
- Shook Ellyn Director 6 rows
- Pokorny Michael VP, Chief Accounting Officer 5 rows
- Cassidy Richard B. II Director 4 rows
- Caulfield Thomas Director 4 rows
- Sayiner Necip Director 4 rows
Everyone on file, with contracts and lobbying under the company's name: Sandisk Corp.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Rule 10b5-1 trading plans The plan must be set up when the insider has no important non-public information.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 21 | 27 | October 21, 2025 | October 2, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.