Sandisk Corp (SNDK)
Every FINRA and SEC series the site collects for Sandisk Corp: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as computer storage devices.
7.7M
Short interest
settlement 2026-08-14
1.0
Days to cover
+12.5% vs prior
61.0%
Short share of volume
2026-09-11
18,618
Fails to deliver
settlement 2026-08-03
-$697K
Insider flow, 90 days
0 buys, 1 sells
As of 2026-09-11.
Short interest
FINRA, twice a month; the last 12 months shown, all 36 settlements in the JSONAs of 14 August 2026, short interest in SNDK is 7,676,558 shares, down 181,132 shares over the last month. Over the last 36 readings it ranged from 4,344,606 shares (31 March 2025) to 10,911,306 shares (15 June 2026). At the reported average volume of 15.2M shares a day that is 1.0 days to cover.
Embed this chartfree, with the attribution line it carries
<iframe src="https://xoomar.com/embed/stocks/sndk" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-08-14 | 7,676,558 | +12.5% | 15,207,988 | 1.00 |
| 2026-07-31 | 6,823,953 | -13.2% | 18,073,238 | 1.00 |
| 2026-07-15 | 7,857,690 | +9.2% | 12,970,416 | 1.00 |
| 2026-06-30 | 7,197,631 | -34.0% | 11,850,362 | 1.00 |
| 2026-06-15 | 10,911,306 | +18.5% | 11,014,453 | 1.00 |
| 2026-05-29 | 9,209,981 | +0.8% | 11,220,692 | 1.00 |
| 2026-05-15 | 9,135,603 | -15.6% | 17,054,610 | 1.00 |
| 2026-04-30 | 10,827,454 | +11.0% | 13,871,376 | 1.00 |
| 2026-04-15 | 9,750,678 | +20.9% | 16,830,102 | 1.00 |
| 2026-03-31 | 8,063,499 | -0.4% | 19,272,923 | 1.00 |
| 2026-03-13 | 8,092,994 | -5.0% | 17,425,426 | 1.00 |
| 2026-02-27 | 8,519,014 | +11.8% | 19,029,810 | 1.00 |
| 2026-02-13 | 7,617,435 | +2.6% | 23,239,839 | 1.00 |
| 2026-01-30 | 7,426,816 | +4.3% | 20,079,985 | 1.00 |
| 2026-01-15 | 7,117,661 | -19.3% | 14,884,739 | 1.00 |
| 2025-12-31 | 8,816,510 | +27.2% | 6,924,731 | 1.27 |
| 2025-12-15 | 6,930,918 | -3.1% | 8,863,121 | 1.00 |
| 2025-11-28 | 7,149,762 | -5.7% | 19,036,422 | 1.00 |
| 2025-11-14 | 7,585,403 | +30.3% | 14,316,611 | 1.00 |
| 2025-10-31 | 5,821,672 | -13.4% | 7,971,510 | 1.00 |
| 2025-10-15 | 6,719,358 | -6.2% | 8,214,747 | 1.00 |
| 2025-09-30 | 7,159,804 | +15.2% | 8,786,180 | 1.00 |
| 2025-09-15 | 6,213,553 | -27.6% | 6,014,433 | 1.03 |
| 2025-08-29 | 8,587,012 | +16.0% | 2,343,601 | 3.66 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 11 September 2026, the short share of SNDK volume is 61.0%, up 1.9 points over the last five sessions. Over the last 52 readings it ranged from 21.0% (29 July 2026) to 61.0% (11 September 2026). The latest reading sits at the top of that range. The latest reading is 15.3 points above the 30-session average of 45.7%, on 4.3M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-09-11 | 2.6M | 4.3M | 61.0% | 9,387 |
| 2026-09-10 | 2.2M | 4.4M | 51.2% | 3,939 |
| 2026-09-09 | 2.6M | 5.1M | 50.5% | 10,423 |
| 2026-09-08 | 2.9M | 5.4M | 53.4% | 13,162 |
| 2026-09-04 | 3.7M | 7.4M | 50.1% | 19,990 |
| 2026-09-03 | 2.3M | 3.9M | 59.1% | 2,377 |
| 2026-09-02 | 2.5M | 4.2M | 61.0% | 8,252 |
| 2026-09-01 | 3.3M | 5.8M | 57.6% | 13,662 |
| 2026-08-31 | 2.8M | 6.5M | 43.1% | 9,971 |
| 2026-08-28 | 1.8M | 4.1M | 44.1% | 12,737 |
| 2026-08-27 | 1.9M | 4.1M | 46.0% | 10,392 |
| 2026-08-26 | 1.6M | 3.8M | 41.9% | 7,697 |
| 2026-08-25 | 1.6M | 4.1M | 38.8% | 333,094 |
| 2026-08-24 | 2.6M | 6.3M | 40.7% | 391,335 |
| 2026-08-21 | 1.3M | 3.2M | 39.3% | 3,939 |
| 2026-08-20 | 2.1M | 5.5M | 38.8% | 12,019 |
| 2026-08-19 | 2.5M | 6.7M | 37.8% | 453,929 |
| 2026-08-18 | 3.5M | 8.4M | 41.8% | 148,778 |
| 2026-08-17 | 3.9M | 8.4M | 47.2% | 10,008 |
| 2026-08-14 | 4.1M | 9.3M | 44.6% | 18,064 |
| 2026-08-13 | 5.2M | 11.0M | 46.9% | 20,398 |
| 2026-08-12 | 2.5M | 5.5M | 46.0% | 6,157 |
| 2026-08-11 | 1.9M | 4.7M | 41.1% | 3,442 |
| 2026-08-10 | 2.3M | 5.0M | 45.2% | 4,639 |
| 2026-08-07 | 2.5M | 6.4M | 38.9% | 376,003 |
| 2026-08-06 | 3.1M | 8.8M | 34.8% | 496,009 |
| 2026-08-05 | 2.5M | 6.0M | 42.1% | 16,198 |
| 2026-08-04 | 2.8M | 6.7M | 41.8% | 3,485 |
| 2026-08-03 | 2.9M | 7.0M | 41.4% | 9,526 |
| 2026-07-31 | 4.1M | 9.5M | 43.8% | 14,219 |
Fails to deliver
SEC, by settlement date. JSONAs of 3 August 2026, the fails-to-deliver balance in SNDK is 18,618 shares, up 18,561 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (21 April 2026) to 66,399 shares (15 June 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-03 | 18,618 | $1214.83 | $22.6M |
| 2026-07-27 | 57 | $1436.56 | $82K |
| 2026-07-24 | 6,990 | $1610.33 | $11.3M |
| 2026-07-22 | 295 | $1589.40 | $469K |
| 2026-07-21 | 283 | $1390.95 | $394K |
| 2026-07-20 | 1,000 | $1354.82 | $1.4M |
| 2026-07-17 | 7,607 | $1411.08 | $10.7M |
| 2026-07-15 | 153 | $1757.82 | $269K |
| 2026-07-13 | 200 | $1915.92 | $383K |
| 2026-07-10 | 3 | $1858.27 | $6K |
| 2026-07-09 | 81 | $1727.18 | $140K |
| 2026-07-07 | 18 | $1744.43 | $31K |
| 2026-07-06 | 43,134 | $1745.00 | $75.3M |
| 2026-07-01 | 10,904 | $2273.73 | $24.8M |
| 2026-06-29 | 10,708 | $2090.71 | $22.4M |
| 2026-06-26 | 1,339 | $2335.00 | $3.1M |
| 2026-06-24 | 636 | $1963.60 | $1.2M |
| 2026-06-23 | 95 | $2273.73 | $216K |
| 2026-06-22 | 3,326 | $2184.75 | $7.3M |
| 2026-06-18 | 6,448 | $1958.80 | $12.6M |
| 2026-06-16 | 363 | $2107.86 | $765K |
| 2026-06-15 | 66,399 | $1980.10 | $131.5M |
| 2026-06-12 | 1,365 | $1881.51 | $2.6M |
| 2026-06-10 | 13,809 | $1646.54 | $22.7M |
| 2026-06-09 | 15,825 | $1642.00 | $26.0M |
| 2026-06-04 | 5,347 | $1831.50 | $9.8M |
| 2026-06-01 | 1,400 | $1694.98 | $2.4M |
| 2026-04-27 | 1,685 | $989.90 | $1.7M |
| 2026-04-21 | 1 | $913.02 | $913 |
| 2026-04-17 | 2 | $919.47 | $2K |
Insider trades
SEC Form 4, newest first, 50 of 89 shown. JSONInsiders at SNDK reported 1 open-market sell worth $697K in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Visoso Luis Felipe (EVP & CFO) on 2026-08-21.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-08-21 | Visoso Luis Felipe | EVP & CFO | Tax withholding | 2K | $1596.08 | $2.5M | 138K |
| 2026-08-21 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 108 | $1596.08 | $172K | 31K |
| 2026-08-21 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 320 | $1596.08 | $511K | 50K |
| 2026-08-21 | Goeckeler David | Chairman and CEO | Tax withholding | 1K | $1596.08 | $1.6M | 508K |
| 2026-08-20 | Visoso Luis Felipe | EVP & CFO | Tax withholding | 26K | $1600.62 | $41.1M | 139K |
| 2026-08-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 111 | $1600.62 | $178K | 31K |
| 2026-08-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 163 | $1600.62 | $261K | 50K |
| 2026-08-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 276 | $1600.62 | $442K | 50K |
| 2026-08-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Option exercise | 276 | $0.00 | $0 | 50K |
| 2026-08-20 | Goeckeler David | Chairman and CEO | Tax withholding | 1K | $1600.62 | $2.1M | 509K |
| 2026-08-03 | Shek Bernard | Chief Legal Officer & Secty | Sell | 600 | $1162.16 | $697K | 31K |
| 2026-06-03 | Shek Bernard | Chief Legal Officer & Secty | Sell | 600 | $1736.00 | $1.0M | 32K |
| 2026-06-02 | Ilkbahar Alper | EVP, Chief Technology Officer | Gift | 3K | $0.00 | $0 | 50K |
| 2026-06-01 | Ilkbahar Alper | EVP, Chief Technology Officer | Sell | 600 | $1758.40 | $1.1M | 53K |
| 2026-06-01 | Ilkbahar Alper | EVP, Chief Technology Officer | Sell | 401 | $1757.00 | $705K | 53K |
| 2026-06-01 | Ilkbahar Alper | EVP, Chief Technology Officer | Sell | 999 | $1755.31 | $1.8M | 54K |
| 2026-05-25 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 211 | $1478.69 | $312K | 33K |
| 2026-05-25 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 653 | $1478.69 | $966K | 55K |
| 2026-05-25 | Goeckeler David | Chairman and CEO | Tax withholding | 2K | $1478.69 | $2.3M | 510K |
| 2026-05-21 | Visoso Luis Felipe | EVP and Chief Financial Office | Tax withholding | 2K | $1542.24 | $2.4M | 165K |
| 2026-05-21 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 107 | $1542.24 | $165K | 33K |
| 2026-05-21 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 319 | $1542.24 | $492K | 55K |
| 2026-05-21 | Goeckeler David | Chairman and CEO | Tax withholding | 1K | $1542.24 | $1.6M | 511K |
| 2026-05-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 109 | $1392.56 | $152K | 33K |
| 2026-05-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 162 | $1392.56 | $226K | 56K |
| 2026-05-20 | Goeckeler David | Chairman and CEO | Tax withholding | 1K | $1392.56 | $1.8M | 513K |
| 2026-05-12 | Pokorny Michael | VP, Chief Accounting Officer | Sell | 2K | $1426.18 | $3.5M | 22K |
| 2026-05-12 | Caulfield Thomas | n/a | Gift | 10K | $0.00 | $0 | 5K |
| 2026-05-09 | Pokorny Michael | VP, Chief Accounting Officer | Tax withholding | 1K | $1562.34 | $2.2M | 25K |
| 2026-05-08 | Sayiner Necip | n/a | Sell | 579 | $1503.11 | $870K | 3K |
| 2026-04-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 41 | $913.02 | $37K | 33K |
| 2026-04-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 2K | $913.02 | $2.1M | 56K |
| 2026-03-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 117 | $709.71 | $83K | 33K |
| 2026-03-03 | Caulfield Thomas | n/a | Gift | 15K | $0.00 | $0 | 2K |
| 2026-02-25 | Suzuki Miyuki | n/a | Sell | 4K | $627.53 | $2.2M | 10K |
| 2026-02-25 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 211 | $632.38 | $133K | 33K |
| 2026-02-25 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 566 | $632.38 | $358K | 58K |
| 2026-02-25 | Goeckeler David | Chairman & CEO | Tax withholding | 2K | $632.38 | $992K | 514K |
| 2026-02-21 | Visoso Luis Felipe | EVP and CFO | Tax withholding | 2K | $649.97 | $1.0M | 167K |
| 2026-02-21 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 107 | $649.97 | $70K | 34K |
| 2026-02-21 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 223 | $649.97 | $145K | 59K |
| 2026-02-21 | Goeckeler David | Chairman & CEO | Tax withholding | 1K | $649.97 | $671K | 515K |
| 2026-02-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 117 | $649.97 | $76K | 34K |
| 2026-02-20 | Ilkbahar Alper | EVP, Chief Technology Officer | Tax withholding | 122 | $649.97 | $79K | 59K |
| 2026-02-20 | Goeckeler David | Chairman & CEO | Tax withholding | 1K | $649.97 | $845K | 516K |
| 2026-01-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 34 | $453.12 | $15K | 34K |
| 2025-12-30 | Bradley Alexander R. | n/a | Grant | 863 | $0.00 | $0 | 863 |
| 2025-12-20 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 117 | $237.61 | $28K | 34K |
| 2025-12-03 | Sayiner Necip | n/a | Sell | 1K | $195.14 | $248K | 3K |
| 2025-11-25 | Shek Bernard | Chief Legal Officer & Secty | Tax withholding | 211 | $220.50 | $47K | 34K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.
Planned sales (Form 144)
Newest first. JSON2 Form 144 notices on file for SNDK worth $16.9M at the prices reported; 2 in the last 90 days worth $16.9M. Latest: BERNARD SHEK filed on 2026-09-08 to sell 4,108 shares ($7.1M) from 2026-09-08.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-08 | BERNARD SHEKOfficer | 4K | $7.1M | 0.003% | 2026-09-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-03 | ALPER ILKBAHAROfficer | 6K | $9.7M | 0.004% | 2026-09-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
13F holders
Tracked managers holding SNDK at their latest 13F. JSON10 of the 30 tracked managers held SNDK at their latest 13F, $27.47B in total at quarter-end prices. Citadel Advisors is the largest at $22.21B (2.5% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 8 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 9.8M | $22.21B | 2.54% | +3.2M |
| D. E. Shaw & Co. | 2026-06-30 | 814K | $1.85B | 0.88% | -1.1M |
| Millennium Management | 2026-06-30 | 596K | $1.36B | 0.49% | -808K |
| AQR Capital Management | 2026-06-30 | 445K | $965.3M | 0.34% | -249K |
| Two Sigma Investments | 2026-06-30 | 251K | $571.6M | 0.41% | -550K |
| Point72 Asset Management | 2026-06-30 | 181K | $411.5M | 0.45% | -471K |
| Duquesne Family Office | 2026-06-30 | 35K | $79.4M | 1.52% | -3K |
| Renaissance Technologies | 2026-06-30 | 5K | $11.3M | 0.02% | -795K |
| Fisher Asset Management | 2026-06-30 | 2K | $4.6M | 0.00% | new or n/a |
| Bridgewater Associates | 2026-06-30 | 317 | $721K | 0.00% | -9K |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
Sandisk Corp in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.
This page follows Sandisk Corp (SNDK), SEC CIK 2023554, listed on Nasdaq, classified by the SEC as computer storage devices. The cross-market tables live on the short interest and insider transactions hubs.
Source and method
- Short interest
- FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-03.JSON and CSV
- Planned sales
- SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-08.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-08-21.JSON and CSV
- Company record
- EDGAR filing index for CIK 2023554Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 30 requests a minute without a key, 120 a minute with a key from a free account.
Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 12 Sep 05:40 UTC.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of SNDK is sold short?
What is SNDK's daily short volume?
Does SNDK have fails to deliver?
Are SNDK insiders buying or selling?
Have SNDK insiders filed to sell?
Which funds hold SNDK?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.