WESTERN DIGITAL CORP (WDC)
Every FINRA and SEC series the site collects for WESTERN DIGITAL 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.
20.3M
Short interest
settlement 2026-08-14
2.3
Days to cover
-17.6% vs prior
47.3%
Short share of volume
2026-09-11
1
Fails to deliver
settlement 2026-08-11
-$14.3M
Insider flow, 90 days
0 buys, 39 sells
As of 2026-09-11.
Short interest
FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSONAs of 14 August 2026, short interest in WDC is 20,281,115 shares, down 2,977,405 shares over the last month. Over the last 48 readings it ranged from 16,253,399 shares (31 October 2024) to 39,478,138 shares (15 September 2025). At the reported average volume of 9.0M shares a day that is 2.3 days to cover.
Embed this chartfree, with the attribution line it carries
<iframe src="https://xoomar.com/embed/stocks/wdc" 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 | 20,281,115 | -17.6% | 8,969,172 | 2.26 |
| 2026-07-31 | 24,599,617 | +5.8% | 7,746,818 | 3.18 |
| 2026-07-15 | 23,258,520 | +3.9% | 6,771,710 | 3.43 |
| 2026-06-30 | 22,377,149 | -15.4% | 13,782,339 | 1.62 |
| 2026-06-15 | 26,449,406 | -17.0% | 6,839,936 | 3.87 |
| 2026-05-29 | 31,871,127 | +7.1% | 6,354,309 | 5.02 |
| 2026-05-15 | 29,765,534 | +2.1% | 8,504,845 | 3.50 |
| 2026-04-30 | 29,140,914 | +8.9% | 6,972,831 | 4.18 |
| 2026-04-15 | 26,758,181 | +0.4% | 7,514,985 | 3.56 |
| 2026-03-31 | 26,653,778 | -3.3% | 9,490,772 | 2.81 |
| 2026-03-13 | 27,567,965 | -7.8% | 7,803,814 | 3.53 |
| 2026-02-27 | 29,882,601 | -5.4% | 8,889,193 | 3.36 |
| 2026-02-13 | 31,585,632 | +0.1% | 11,847,503 | 2.67 |
| 2026-01-30 | 31,540,967 | -5.9% | 10,697,494 | 2.95 |
| 2026-01-15 | 33,513,366 | -9.1% | 9,567,772 | 3.50 |
| 2025-12-31 | 36,866,308 | +17.6% | 8,128,699 | 4.54 |
| 2025-12-15 | 31,351,861 | +1.7% | 6,574,405 | 4.77 |
| 2025-11-28 | 30,825,377 | -8.3% | 7,839,656 | 3.93 |
| 2025-11-14 | 33,625,289 | +5.2% | 9,885,586 | 3.40 |
| 2025-10-31 | 31,956,205 | -6.5% | 10,294,390 | 3.10 |
| 2025-10-15 | 34,186,289 | -7.2% | 10,379,028 | 3.29 |
| 2025-09-30 | 36,849,266 | -6.7% | 9,545,267 | 3.86 |
| 2025-09-15 | 39,478,138 | +12.4% | 10,100,196 | 3.91 |
| 2025-08-29 | 35,113,585 | +5.4% | 5,520,442 | 6.36 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 11 September 2026, the short share of WDC volume is 47.3%, up 0.1 points over the last five sessions. Over the last 52 readings it ranged from 19.8% (16 July 2026) to 58.2% (30 July 2026). The latest reading is 3.6 points above the 30-session average of 43.8%, on 2.2M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-09-11 | 1.0M | 2.2M | 47.3% | 3,328 |
| 2026-09-10 | 941K | 2.0M | 47.4% | 1,296 |
| 2026-09-09 | 1.1M | 2.1M | 51.8% | 4,407 |
| 2026-09-08 | 1.1M | 2.8M | 38.9% | 3,797 |
| 2026-09-04 | 955K | 2.3M | 40.9% | 4,130 |
| 2026-09-03 | 1.3M | 2.7M | 47.2% | 5,809 |
| 2026-09-02 | 599K | 1.8M | 33.9% | 3,911 |
| 2026-09-01 | 717K | 3.1M | 23.3% | 13,102 |
| 2026-08-31 | 941K | 2.2M | 41.9% | 3,430 |
| 2026-08-28 | 825K | 2.0M | 41.9% | 1,098 |
| 2026-08-27 | 1.5M | 3.4M | 45.2% | 1,663 |
| 2026-08-26 | 885K | 2.2M | 39.5% | 1,511 |
| 2026-08-25 | 749K | 2.1M | 35.3% | 5,699 |
| 2026-08-24 | 841K | 3.2M | 25.9% | 5,844 |
| 2026-08-21 | 958K | 2.2M | 43.5% | 46,605 |
| 2026-08-20 | 1.2M | 2.6M | 48.6% | 16,738 |
| 2026-08-19 | 1.4M | 3.2M | 43.5% | 1,442 |
| 2026-08-18 | 2.0M | 4.3M | 47.4% | 7,160 |
| 2026-08-17 | 2.4M | 4.6M | 52.8% | 5,947 |
| 2026-08-14 | 2.5M | 5.2M | 49.2% | 4,610 |
| 2026-08-13 | 2.3M | 4.4M | 51.9% | 3,552 |
| 2026-08-12 | 1.1M | 2.8M | 39.9% | 7,090 |
| 2026-08-11 | 920K | 2.5M | 37.3% | 2,121 |
| 2026-08-10 | 1.4M | 3.4M | 40.8% | 10,449 |
| 2026-08-07 | 2.4M | 5.7M | 42.5% | 266,097 |
| 2026-08-06 | 3.8M | 7.2M | 52.5% | 340,363 |
| 2026-08-05 | 2.0M | 4.2M | 48.4% | 1,788 |
| 2026-08-04 | 1.9M | 3.8M | 50.5% | 8,647 |
| 2026-08-03 | 2.2M | 4.4M | 49.0% | 12,598 |
| 2026-07-31 | 2.4M | 4.5M | 54.6% | 4,215 |
Fails to deliver
SEC, by settlement date. JSONAs of 11 August 2026, the fails-to-deliver balance in WDC is 1 share, unchanged over the last settlement date. Over the last 52 readings it ranged from 1 share (7 August 2026) to 420,591 shares (9 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-11 | 1 | $438.34 | $438 |
| 2026-08-07 | 1 | $451.52 | $452 |
| 2026-08-05 | 238 | $548.56 | $131K |
| 2026-08-03 | 1,100 | $544.84 | $599K |
| 2026-07-29 | 2,782 | $463.51 | $1.3M |
| 2026-07-20 | 1,556 | $477.22 | $743K |
| 2026-07-17 | 3,575 | $466.81 | $1.7M |
| 2026-07-14 | 1,079 | $555.55 | $599K |
| 2026-07-10 | 9,528 | $578.05 | $5.5M |
| 2026-07-09 | 11,250 | $550.30 | $6.2M |
| 2026-07-08 | 12,242 | $532.10 | $6.5M |
| 2026-07-07 | 13,714 | $577.46 | $7.9M |
| 2026-07-06 | 14,914 | $539.00 | $8.0M |
| 2026-07-02 | 15,722 | $598.37 | $9.4M |
| 2026-07-01 | 17,973 | $638.72 | $11.5M |
| 2026-06-30 | 95,125 | $651.88 | $62.0M |
| 2026-06-25 | 3,430 | $643.83 | $2.2M |
| 2026-06-22 | 164,945 | $746.23 | $123.1M |
| 2026-06-17 | 517 | $681.08 | $352K |
| 2026-06-15 | 2,026 | $562.93 | $1.1M |
| 2026-06-09 | 420,591 | $526.93 | $221.6M |
| 2026-06-05 | 900 | $575.50 | $518K |
| 2026-06-02 | 9 | $546.20 | $5K |
| 2026-06-01 | 4,153 | $531.21 | $2.2M |
| 2026-04-30 | 177,278 | $412.76 | $73.2M |
| 2026-04-27 | 1,308 | $404.00 | $528K |
| 2026-04-20 | 10,125 | $372.52 | $3.8M |
| 2026-04-16 | 8,260 | $365.00 | $3.0M |
| 2026-04-13 | 3,100 | $343.43 | $1.1M |
| 2026-04-10 | 447 | $337.88 | $151K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at WDC reported 39 open-market sells worth $14.3M 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: Tregillis Cynthia L (Chief Legal Officer & Corp Sec) on 2026-09-04.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-04 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Sell | 432 | $451.20 | $195K | 111K |
| 2026-09-04 | Gubbi Vidyadhara K | Chief of Global Operations | Sell | 2K | $459.87 | $825K | 81K |
| 2026-09-03 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Tax withholding | 700 | $441.57 | $309K | 111K |
| 2026-09-03 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Option exercise | 7 | $0.00 | $0 | 112K |
| 2026-09-03 | Gubbi Vidyadhara K | Chief of Global Operations | Tax withholding | 2K | $441.57 | $779K | 82K |
| 2026-09-03 | Gubbi Vidyadhara K | Chief of Global Operations | Option exercise | 14 | $0.00 | $0 | 84K |
| 2026-09-03 | Davis Brian Scott | Chief Sales & Mrktng Officer | Tax withholding | 882 | $441.57 | $389K | 100K |
| 2026-09-03 | Davis Brian Scott | Chief Sales & Mrktng Officer | Option exercise | 7 | $0.00 | $0 | 101K |
| 2026-09-01 | Tan Irving | Chief Executive Officer | Gift | 113K | $0.00 | $0 | 0 |
| 2026-09-01 | STREETER STEPHANIE A | n/a | Sell | 2K | $455.00 | $728K | 35K |
| 2026-08-31 | Tan Irving | Chief Executive Officer | J | 113K | $0.00 | $0 | 267K |
| 2026-08-31 | STREETER STEPHANIE A | n/a | Sell | 2K | $447.06 | $894K | 38K |
| 2026-08-27 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Sell | 1K | $478.36 | $482K | 112K |
| 2026-08-26 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Tax withholding | 2K | $468.88 | $765K | 113K |
| 2026-08-26 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Option exercise | 9 | $0.00 | $0 | 115K |
| 2026-08-26 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Sell | 476 | $450.78 | $215K | 115K |
| 2026-08-26 | Tan Irving | Chief Executive Officer | Tax withholding | 3K | $468.88 | $1.6M | 379K |
| 2026-08-26 | Tan Irving | Chief Executive Officer | Option exercise | 42 | $0.00 | $0 | 382K |
| 2026-08-26 | Shihab Ahmed Mohammed | Chief Product Officer | Tax withholding | 3K | $468.88 | $1.3M | 164K |
| 2026-08-26 | Shihab Ahmed Mohammed | Chief Product Officer | Option exercise | 15 | $0.00 | $0 | 166K |
| 2026-08-26 | Sennesael Kris | Chief Financial Officer | Tax withholding | 4K | $468.88 | $2.0M | 174K |
| 2026-08-26 | Sennesael Kris | Chief Financial Officer | Option exercise | 19 | $0.00 | $0 | 178K |
| 2026-08-26 | Gubbi Vidyadhara K | Chief of Global Operations | Tax withholding | 2K | $468.88 | $964K | 84K |
| 2026-08-26 | Gubbi Vidyadhara K | Chief of Global Operations | Option exercise | 9 | $0.00 | $0 | 86K |
| 2026-08-26 | Davis Brian Scott | Chief Sales & Mrktng Officer | Tax withholding | 2K | $468.88 | $771K | 101K |
| 2026-08-26 | Davis Brian Scott | Chief Sales & Mrktng Officer | Option exercise | 7 | $0.00 | $0 | 103K |
| 2026-08-25 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Grant | 4K | $0.00 | $0 | 115K |
| 2026-08-25 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Tax withholding | 771 | $450.75 | $348K | 111K |
| 2026-08-25 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Option exercise | 7 | $0.00 | $0 | 112K |
| 2026-08-25 | Tan Irving | Chief Executive Officer | Grant | 17K | $0.00 | $0 | 382K |
| 2026-08-25 | Tan Irving | Chief Executive Officer | Tax withholding | 476 | $450.75 | $215K | 366K |
| 2026-08-25 | Tan Irving | Chief Executive Officer | Option exercise | 32 | $0.00 | $0 | 366K |
| 2026-08-25 | Shihab Ahmed Mohammed | Chief Product Officer | Grant | 7K | $0.00 | $0 | 166K |
| 2026-08-25 | Sennesael Kris | Chief Financial Officer | Grant | 8K | $0.00 | $0 | 178K |
| 2026-08-25 | Gubbi Vidyadhara K | Chief of Global Operations | Grant | 5K | $0.00 | $0 | 86K |
| 2026-08-25 | Gubbi Vidyadhara K | Chief of Global Operations | Tax withholding | 1K | $450.75 | $515K | 81K |
| 2026-08-25 | Gubbi Vidyadhara K | Chief of Global Operations | Option exercise | 9 | $0.00 | $0 | 82K |
| 2026-08-25 | Feller Brad | SVP & Chief Accounting Officer | Grant | 2K | $0.00 | $0 | 12K |
| 2026-08-25 | Davis Brian Scott | Chief Sales & Mrktng Officer | Grant | 4K | $0.00 | $0 | 103K |
| 2026-08-25 | Davis Brian Scott | Chief Sales & Mrktng Officer | Tax withholding | 971 | $450.75 | $438K | 99K |
| 2026-08-25 | Davis Brian Scott | Chief Sales & Mrktng Officer | Option exercise | 7 | $0.00 | $0 | 100K |
| 2026-08-24 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Sell | 684 | $446.17 | $305K | 112K |
| 2026-08-21 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Tax withholding | 1K | $459.44 | $510K | 113K |
| 2026-08-21 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Option exercise | 11 | $0.00 | $0 | 114K |
| 2026-08-21 | Tregillis Cynthia L | Chief Legal Officer & Corp Sec | Sell | 235 | $477.27 | $112K | 114K |
| 2026-08-21 | Tan Irving | Chief Executive Officer | Tax withholding | 545 | $459.44 | $250K | 575K |
| 2026-08-21 | Tan Irving | Chief Executive Officer | Option exercise | 25 | $0.00 | $0 | 576K |
| 2026-08-21 | Gubbi Vidyadhara K | Chief of Global Operations | Tax withholding | 694 | $459.44 | $319K | 82K |
| 2026-08-21 | Gubbi Vidyadhara K | Chief of Global Operations | Option exercise | 5 | $0.00 | $0 | 83K |
| 2026-08-21 | Davis Brian Scott | Chief Sales & Mrktng Officer | Tax withholding | 593 | $459.44 | $272K | 100K |
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. JSON9 Form 144 notices on file for WDC worth $15.9M at the prices reported; 9 in the last 90 days worth $15.9M. Latest: CYNTHIA LOCK TREGILLIS filed on 2026-09-04 to sell 432 shares ($195K) from 2026-09-04.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-04 | CYNTHIA LOCK TREGILLISOfficer | 432 | $195K | 0.000% | 2026-09-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-04 | VIDYADHARA K GUBBIOfficer | 2K | $825K | 0.000% | 2026-09-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-31 | STREETER STEPHANIE AASSOCIATED TO AFFILIATE | 10K | $4.5M | 0.003% | 2026-08-31 | FIDELITY BROKERAGE SERVICES LLC |
| 2026-08-27 | CYNTHIA LOCK TREGILLISOfficer | 1K | $482K | 0.000% | 2026-08-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-26 | CYNTHIA LOCK TREGILLISOfficer | 476 | $215K | 0.000% | 2026-08-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-24 | CYNTHIA LOCK TREGILLISOfficer | 684 | $305K | 0.000% | 2026-08-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-21 | CYNTHIA LOCK TREGILLISOfficer | 235 | $112K | 0.000% | 2026-08-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-11 | IRVING TANOfficer, Director | 20K | $8.9M | 0.006% | 2026-08-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-07-21 | CYNTHIA LOCK TREGILLISOfficer | 808 | $428K | 0.000% | 2026-07-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person, newest filing first. JSON3 holders above 5% have filed on WDC, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 7.2% of the class (26,361,315 shares), filed 2026-08-06 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G/Ano. 6 | FMR LLCparent holding company | 26.4M | 7.2% | 2026-06-30 |
| 2026-08-06 | 13G/Ano. 6 | Abigail P. Johnsonindividual | 26.4M | 7.2% | 2026-06-30 |
| 2026-07-31 | 13G/Ano. 1 | Vanguard Portfolio Managementinvestment adviser | 13.2M | 3.6% | 2026-06-30 |
13F holders
Tracked managers holding WDC at their latest 13F. JSON11 of the 30 tracked managers held WDC at their latest 13F, $13.09B in total at quarter-end prices. Citadel Advisors is the largest at $5.59B (0.6% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 8 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 8.8M | $5.59B | 0.64% | +2.9M |
| AQR Capital Management | 2026-06-30 | 2.9M | $1.88B | 0.65% | -519K |
| D. E. Shaw & Co. | 2026-06-30 | 2.9M | $1.83B | 0.87% | -149.7M |
| Two Sigma Investments | 2026-06-30 | 89.0M | $1.50B | 1.08% | -275K |
| Millennium Management | 2026-06-30 | 58.0M | $980.0M | 0.35% | +57.1M |
| Millennium Management | 2026-06-30 | 991K | $633.3M | 0.23% | +257K |
| Renaissance Technologies | 2026-06-30 | 537K | $343.3M | 0.47% | -609K |
| Point72 Asset Management | 2026-06-30 | 266K | $169.8M | 0.19% | -843K |
| Bridgewater Associates | 2026-06-30 | 172K | $110.1M | 0.45% | -77K |
| Two Sigma Investments | 2026-06-30 | 75K | $47.6M | 0.03% | -88.9M |
| Fisher Asset Management | 2026-06-30 | 9K | $5.5M | 0.00% | -6K |
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.
Financials
SEC XBRL, as filed. JSONIn Q4 2026 (quarter ended 2026-07-03) WESTERN DIGITAL CORP reported revenue of $3.75B, up 24.2% from the same quarter a year earlier, and net income of $3.19B. In FY 2026 it generated $3.93B of operating cash flow and spent $2.59B on buybacks and $174.0M on dividends. As of 2026-07-03, cash was $1.58B against $1.05B of debt.
- Cash
- $1.58B
- Debt
- $1.05B
- Equity
- $8.86B
- Total assets
- $13.86B
- Shares outstanding
- 360,540,944
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q4 2026derived | 2026-07-03 | $3.75B | $3.19B | 85.3% | n/a |
| Q1 2026 | 2026-04-03 | $3.34B | $3.21B | 96.0% | 8.20 |
| Q4 2025 | 2026-01-02 | $3.02B | $1.84B | 61.1% | 4.73 |
| Q3 2025 | 2025-10-03 | $2.82B | $1.18B | 41.9% | 3.07 |
| Q2 2025 | 2025-06-27 | $2.60B | $282.0M | 10.8% | 0.75 |
| Q1 2025 | 2025-03-28 | $2.29B | $520.0M | 22.7% | 1.42 |
| Q4 2024 | 2024-12-27 | $2.41B | $594.0M | 24.7% | 1.63 |
| Q3 2024 | 2024-09-27 | $2.21B | $493.0M | 22.3% | 1.35 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2026 | 2026-07-03 | $12.92B | $9.42B | $3.93B | $418.0M | $2.59B | $174.0M |
| FY 2024 | 2025-06-27 | $9.52B | $1.89B | $1.69B | $412.0M | $149.0M | $44.0M |
| FY 2023 | 2024-06-28 | $6.32B | -$798.0M | -$294.0M | $487.0M | $0 | $0 |
| FY 2022 | 2022-07-01 | $18.79B | $1.55B | $1.88B | $1.12B | n/a | $0 |
| FY 2021 | 2021-07-02 | $16.92B | $821.0M | $1.90B | $1.15B | $0 | $0 |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-07-03; shares outstanding as of 2026-08-07 from the cover page.
What this page is
WESTERN DIGITAL 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 WESTERN DIGITAL CORP (WDC), SEC CIK 106040, 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 2026-08-11.JSON and CSV
- Planned sales
- SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-04.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-08-06.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
- Financials
- SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-07-03.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-04.JSON and CSV
- Company record
- EDGAR filing index for CIK 106040Ticker, 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, 13 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.
Other companies the SEC classifies as computer storage devices
- STXSeagate Technology Holdings plc
- PEverpure, Inc.
- SNDKSandisk Corp
- CRWVCoreWeave, Inc.
- UTHRUNITED THERAPEUTICS Corp
- TEAMAtlassian Corp
- CVNACARVANA CO.
- CRWDCrowdStrike Holdings, Inc.
- RCGRENN Fund, Inc.
- APPAppLovin Corp
- SESea Ltd
- VICRVICOR CORP
- GOOGLAlphabet Inc.
- ANETArista Networks, Inc.
- CRMSalesforce, Inc.
- RDDTReddit, Inc.
- CRDOCredo Technology Group Holding Ltd
- NVDANVIDIA CORP
- METAMeta Platforms, Inc.
- APPFAPPFOLIO INC
- ALABAstera Labs, Inc.
- IOTSamsara Inc.
- DASHDoorDash, Inc.
- WALWESTERN ALLIANCE BANCORPORATION
Datasets
Frequently Asked Questions
How much of WDC is sold short?
What is WDC's daily short volume?
Does WDC have fails to deliver?
Are WDC insiders buying or selling?
Have WDC insiders filed to sell?
Who owns more than 5% of WDC?
What did WDC report last quarter?
Which funds hold WDC?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.