Sandisk (SNDK)
Sandisk on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as computer storage devices.
5.6M
Short interest
settlement 2026-09-15
1.0
Days to cover
unchanged vs prior
47.3%
Short share of volume
2026-10-08
61,155
Fails to deliver
settlement 2026-09-10
Thu 5 Nov
Next earnings
estimated date
-$121.2M
Insider flow, 90 days
0 buys, 67 sells
As of 2026-10-08.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 38 in the chart. JSONAs of 15 September 2026, short interest in SNDK is 5,618,213 shares, down 2,058,345 shares over the last month. Over the last 38 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 10.0M shares a day that is 1.0 days to cover.
Embed this chart.The embed keeps its attribution line.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-15 | 5,618,213 | -6.3% | 9,998,178 | 1.00 |
| 2026-08-31 | 5,996,105 | -21.9% | 12,961,159 | 1.00 |
| 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 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 8 October 2026, the short share of SNDK volume is 47.3%, down 5.1 points over the last five sessions. Over the last 30 readings it ranged from 42.3% (6 October 2026) to 63.3% (16 September 2026). The latest reading is 6.8 points below the 30-session average of 54.1%, on 4.9M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-08 | 2.3M | 4.9M | 47.3% | 3,704 |
| 2026-10-07 | 2.4M | 5.2M | 46.2% | 5,954 |
| 2026-10-06 | 1.4M | 3.3M | 42.3% | 4,232 |
| 2026-10-05 | 1.5M | 3.4M | 43.7% | 6,803 |
| 2026-10-02 | 2.2M | 3.7M | 59.4% | 5,266 |
| 2026-10-01 | 2.4M | 4.6M | 52.4% | 8,073 |
| 2026-09-30 | 1.5M | 3.0M | 49.3% | 6,626 |
| 2026-09-29 | 1.9M | 3.2M | 59.6% | 6,062 |
| 2026-09-28 | 2.0M | 3.4M | 59.4% | 3,662 |
| 2026-09-25 | 2.4M | 4.0M | 60.6% | 7,903 |
| 2026-09-24 | 2.4M | 4.2M | 57.7% | 3,761 |
| 2026-09-23 | 2.3M | 3.9M | 60.3% | 10,500 |
| 2026-09-22 | 3.6M | 6.4M | 56.9% | 11,387 |
| 2026-09-21 | 2.6M | 5.0M | 53.1% | 7,025 |
| 2026-09-18 | 4.0M | 6.5M | 61.0% | 17,518 |
| 2026-09-17 | 2.5M | 4.2M | 58.6% | 13,379 |
| 2026-09-16 | 2.5M | 3.9M | 63.3% | 3,861 |
| 2026-09-15 | 2.2M | 3.6M | 61.2% | 4,589 |
| 2026-09-14 | 2.5M | 4.6M | 54.9% | 15,242 |
| 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 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 10 September 2026, the fails-to-deliver balance in SNDK is 61,155 shares, up 41,230 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (10 July 2026) to 61,155 shares (10 September 2026). The latest reading sits at the top of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-10 | 61,155 | $1764.17 | $107.9M |
| 2026-09-08 | 19,925 | $1740.00 | $34.7M |
| 2026-09-01 | 11,615 | $1566.70 | $18.2M |
| 2026-08-27 | 21 | $1499.37 | $31K |
| 2026-08-25 | 36,417 | $1493.12 | $54.4M |
| 2026-08-24 | 1,700 | $1596.08 | $2.7M |
| 2026-08-21 | 857 | $1600.62 | $1.4M |
| 2026-08-20 | 45 | $1568.87 | $71K |
| 2026-08-19 | 66 | $1625.78 | $107K |
| 2026-08-17 | 316 | $1641.11 | $519K |
| 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 |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at SNDK reported 67 open-market sells worth $121.2M in the last 90 days and no open-market buys. Latest filing: Shek Bernard (Chief Legal Officer and Secty) on 2026-10-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | Shek Bernard | Chief Legal Officer and Secty | Sell | 600 | $1734.94 | $1.0M | 26K |
| 2026-09-20 | Shek Bernard | Chief Legal Officer and Secty | Tax withholding | 118 | $1791.82 | $211K | 26K |
| 2026-09-17 | Ilkbahar Alper | EVP & Chief Technology Officer | Grant | 2K | $0.00 | $0 | 42K |
| 2026-09-17 | Shek Bernard | Chief Legal Officer and Secty | Grant | 1K | $0.00 | $0 | 26K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 165 | $1587.00 | $262K | 383K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 2K | $1585.85 | $2.4M | 383K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 1K | $1583.80 | $1.7M | 385K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 1K | $1580.25 | $2.3M | 386K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 640 | $1579.40 | $1.0M | 387K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 3K | $1578.34 | $4.5M | 388K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 4K | $1576.82 | $6.5M | 391K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 3K | $1575.58 | $4.4M | 395K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 3K | $1574.57 | $4.1M | 398K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 306 | $1573.15 | $481K | 400K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 1K | $1572.60 | $1.8M | 400K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 5K | $1571.21 | $7.2M | 402K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 910 | $1570.04 | $1.4M | 406K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 10K | $1569.00 | $15.1M | 407K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Sell | 40 | $1567.26 | $63K | 417K |
| 2026-09-17 | Goeckeler David | Chairman & CEO | Grant | 3K | $0.00 | $0 | 417K |
| 2026-09-17 | Visoso Luis Felipe | EVP & CFO | Grant | 2K | $0.00 | $0 | 133K |
| 2026-09-17 | Pokorny Michael | VP, Chief Accounting Officer | Grant | 458 | $0.00 | $0 | 22K |
| 2026-09-15 | Visoso Luis Felipe | EVP & CFO | Sell | 1K | $1568.83 | $1.6M | 131K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 360 | $1541.88 | $555K | 413K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 864 | $1540.78 | $1.3M | 414K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 1K | $1539.19 | $2.3M | 415K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 3K | $1537.68 | $4.9M | 416K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 2K | $1535.96 | $2.6M | 419K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 700 | $1535.12 | $1.1M | 421K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 1K | $1532.17 | $1.8M | 422K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 359 | $1529.36 | $549K | 423K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 4K | $1528.45 | $6.2M | 423K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 2K | $1526.45 | $3.5M | 427K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 3K | $1524.27 | $4.7M | 430K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 181 | $1522.87 | $276K | 433K |
| 2026-09-14 | Goeckeler David | Chairman & CEO | Sell | 14K | $1522.59 | $21.9M | 433K |
| 2026-09-08 | Shek Bernard | Chief Legal Officer & Secty | Sell | 2K | $1767.33 | $4.1M | 25K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 40 | $1571.04 | $63K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 40 | $1558.90 | $62K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1557.79 | $125K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 40 | $1554.02 | $62K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 120 | $1553.35 | $186K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 40 | $1550.48 | $62K | 44K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 40 | $1548.85 | $62K | 45K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1547.46 | $124K | 45K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1546.02 | $124K | 45K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1542.67 | $123K | 47K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1541.01 | $123K | 47K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1539.61 | $123K | 47K |
| 2026-09-03 | Ilkbahar Alper | EVP & Chief Technology Officer | Sell | 80 | $1538.41 | $123K | 48K |
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 rarer.
Planned sales (Form 144)
Newest first. JSON25 Form 144 notices on file for SNDK worth $153.1M at the prices reported; 5 in the last 90 days worth $128.3M. Latest: DAVID GOECKELER filed on 2026-09-17 to sell 33,841 shares ($51.4M) from 2026-09-17.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-17 | DAVID GOECKELERDirector, Officer | 34K | $51.4M | 0.023% | 2026-09-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-15 | LUIS VISOSOOfficer | 3K | $4.7M | 0.002% | 2026-09-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-14 | DAVID GOECKELERDirector, Officer | 34K | $55.3M | 0.023% | 2026-09-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 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 |
| 2026-06-03 | BERNARD SHEKOfficer | 2K | $4.1M | 0.002% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-01 | ALPER ILKBAHAROfficer | 2K | $3.5M | 0.001% | 2026-06-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-12 | MICHAEL POKORNYOfficer | 2K | $3.5M | 0.002% | 2026-05-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-08 | NECIP SAYINERDirector | 579 | $870K | 0.000% | 2026-05-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-25 | MIYUKI SUZUKIDirector | 4K | $2.2M | 0.002% | 2026-02-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-03 | MASSENGILL LIVING TRUSTFormer Affiliate | 2K | $1.3M | 0.001% | 2026-02-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-02 | MASSENGILL LIVING TRUSTFormer Affiliate | 2K | $1.3M | 0.001% | 2026-02-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-22 | KIMBERLY ALEXYFormer Director | 1K | $690K | 0.001% | 2026-01-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-21 | MASSENGILL LIVING TRUSTFormer Affiliate | 2K | $985K | 0.001% | 2026-01-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-16 | KIMBERLY ALEXYFormer Director | 2K | $740K | 0.001% | 2026-01-16 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-15 | MASSENGILL LIVING TRUSTFormer Affiliate | 1K | $421K | 0.001% | 2026-01-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-07 | MASSENGILL LIVINGFormer Affiliate | 2K | $694K | 0.001% | 2026-01-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-06 | MASSENGILL LIVING TRUSTFormer Affiliate | 3K | $953K | 0.002% | 2026-01-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-06 | KIMBERLY ALEXYDirector | 3K | $1.0M | 0.002% | 2026-01-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-03 | NECIP SAYINERDirector | 1K | $248K | 0.001% | 2025-12-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-26 | MASSENGILL LIVING TRUSTFormer Affiliate | 2K | $508K | 0.002% | 2025-11-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-25 | MASSENGILL LIVING TRUSTFormer Director | 2K | $336K | 0.001% | 2025-11-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-24 | MASSENGILL LIVING TRUSTFormer Affiliate | 1K | $225K | 0.001% | 2025-11-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-21 | KIMBERLY ALEXYDirector | 2K | $486K | 0.002% | 2025-11-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-20 | KIMBERLY ALEXYDirector | 3K | $653K | 0.002% | 2025-11-20 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON5 holders report 5% or more of SNDK in their latest filing, all on Schedule 13G (passive). The largest reported stake is Vanguard Capital Management at 7.2% of the class (11,000,476 shares), filed 2026-04-30 for an event on 2026-03-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G/Ano. 3 | FMR LLCparent holding company | 7.9M | 5.3% | 2026-06-30 |
| 2026-08-06 | 13G/Ano. 3 | Abigail P. Johnsonindividual | 7.9M | 5.3% | 2026-06-30 |
| 2026-08-05 | 13G | JANE STREET GROUP, LLCparent holding company | 7.4M | 5.0% | 2026-07-30 |
| 2026-08-05 | 13G | Jane Street Capital, LLCbroker-dealer | 5.9M | 4.0% | 2026-07-30 |
| 2026-08-05 | 13G | Jane Street Global Trading, LLCother entity | 1.3M | 0.9% | 2026-07-30 |
| 2026-08-05 | 13G | Leonard Street Holdings, LPother entity | 238K | 0.2% | 2026-07-30 |
| 2026-05-15 | 13G/Ano. 2 | Western Digital Corporationcorporation | 1.0M | 0.7% | 2026-03-31 |
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 11.0M | 7.2% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-01-21 | 13G/Ano. 3 | BlackRock, Inc.parent holding company | 8.8M | 6.0% | 2025-12-31 |
| 2025-11-10 | 13G/Ano. 1 | DNB Asset Management ASinvestment adviser | 1.0M | 0.7% | 2025-09-30 |
13F holders
Tracked managers holding SNDK at their latest 13F. JSON10 of the 30 tracked managers held SNDK at their latest 13F, $3.99B in total at quarter-end prices. D. E. Shaw & Co. is the largest at $1.28B (0.6% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 9 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2026-06-30 | 562K | $1.28B | 0.61% | -611K |
| AQR Capital Management | 2026-06-30 | 445K | $965.3M | 0.34% | -249K |
| Millennium Management | 2026-06-30 | 366K | $832.5M | 0.30% | -776K |
| Two Sigma Investments | 2026-06-30 | 242K | $549.5M | 0.40% | -521K |
| Citadel Advisors | 2026-06-30 | 67K | $153.3M | 0.02% | -540K |
| Point72 Asset Management | 2026-06-30 | 50K | $113.0M | 0.12% | -327K |
| 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 |
| 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 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 puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, 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 one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Sandisk (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 updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-08.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-10.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-09-17.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-06.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-05.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 2023554Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
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 large short position are rare and stand out; insider sells next to one 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?
5,618,213 shares were held short at the 2026-09-15 settlement, 1.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is SNDK's daily short volume?
On 2026-10-08, 2,314,685 of the 4,893,698 SNDK shares reported to FINRA were sold short, 47.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does SNDK have fails to deliver?
The SEC's latest file shows 61,155 SNDK shares failed to deliver at settlement 2026-09-10. Fails are reported per settlement date and published twice a month with a lag.
Are SNDK insiders buying or selling?
Insiders at SNDK reported 67 open-market sells worth $121.2M in the last 90 days and no open-market buys. Latest filing: Shek Bernard (Chief Legal Officer and Secty) on 2026-10-01.
Have SNDK insiders filed to sell?
25 Form 144 notices on file for SNDK worth $153.1M at the prices reported; 5 in the last 90 days worth $128.3M. Latest: DAVID GOECKELER filed on 2026-09-17 to sell 33,841 shares ($51.4M) from 2026-09-17.
Who owns 5% or more of SNDK?
5 holders report 5% or more of SNDK in their latest filing, all on Schedule 13G (passive). The largest reported stake is Vanguard Capital Management at 7.2% of the class (11,000,476 shares), filed 2026-04-30 for an event on 2026-03-31.
Which tracked 13F managers own SNDK?
10 of the 30 tracked 13F managers held SNDK shares at their latest filing, $3.99B in all. The largest: D. E. Shaw & Co. (562K shares, $1.28B), Cliff Asness's AQR Capital Management (445K shares, $965.3M), Izzy Englander's Millennium Management (366K shares, $832.5M), Two Sigma Investments (242K shares, $549.5M), Ken Griffin's Citadel Advisors (67K shares, $153.3M), Steve Cohen's Point72 Asset Management (50K shares, $113.0M). The table above lists all 10.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.