W
Western Digital
WDC · Storage
$513.84
-49.48 (-8.78%)
As of Jul 15, 2026 close
Institutional Ownership — Q1 2026 (filed through May 29)
Institutional Holders
1389
+227 vs Q4 2025
Shares Held
327.4M
-6.7M QoQ
% of Shares Out
29.2%
100.5M held with sole discretion
Value Held
$168.2B
at $513.84 · Jul 15, 2026 close
5%+ Owners
4
via 13G/13D
% of Shares Out counts only shares held with sole investment discretion. Where two managers share discretion, Form 13F requires each to report the full position, so summing every filer exceeds 100% of shares outstanding for widely-held names.
Holder Map
Block size ∝ position · color = QoQ changeWhale Activity — Q1 2026 Filings
Increased440
Decreased478
New position358
Closed131
Institutional Shares Held by Quarter
Holders
Sortable · search holders| Source | % of Shrs Out | Period | |||||
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13F | 35,769,222 | +259,704 +0.7% | $9.7B | 10.4% | Mar 31, 2026 | |
| FMR LLC | 13F | 31,623,418 | -2,170,383 -6.4% | $8.6B | 9.2% | Mar 31, 2026 | |
| VANGUARD CAPITAL MANAGEMENT LLC | 13F | 22,034,861 | +22,034,861 new | $6.0B | 6.4% | Mar 31, 2026 | |
| JPMORGAN CHASE & CO | 13F | 17,512,148 | +3,216,183 +22.5% | $4.4B | 5.1% | Mar 31, 2026 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 13F | 17,172,653 | +17,172,653 new | $4.6B | 5.0% | Mar 31, 2026 | |
| STATE STREET CORP | 13F | 15,465,766 | -230,188 -1.5% | $4.2B | 4.5% | Mar 31, 2026 | |
| Capital World Investors | 13F | 11,880,038 | +10,816,431 +1017.0% | $3.2B | 3.4% | Mar 31, 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC | 13F | 9,477,201 | +194,769 +2.1% | $2.6B | 2.7% | Mar 31, 2026 | |
| BANK OF AMERICA CORP /DE/ | 13F | 8,489,612 | -3,555,039 -29.5% | $2.3B | 2.5% | Mar 31, 2026 | |
| MORGAN STANLEY | 13F | 7,939,106 | -1,005,556 -11.2% | $2.1B | 2.3% | Mar 31, 2026 | |
| WCM INVESTMENT MANAGEMENT, LLC | 13F | 6,561,810 | -129,399 -1.9% | $1.7B | 1.9% | Mar 31, 2026 | |
| AMERIPRISE FINANCIAL INC | 13F | 5,762,533 | -2,757,892 -32.4% | $1.6B | 1.7% | Mar 31, 2026 | |
| Invesco Ltd. | 13F | 5,530,864 | +75,621 +1.4% | $1.5B | 1.6% | Mar 31, 2026 | |
| GOLDMAN SACHS GROUP INC | 13F | 5,406,883 | +847,170 +18.6% | $1.5B | 1.6% | Mar 31, 2026 | |
| UBS Group AG | 13F | 4,182,454 | -368,367 -8.1% | $1.1B | 1.2% | Mar 31, 2026 | |
| NORTHERN TRUST CORP | 13F | 3,606,563 | -65,392 -1.8% | $975.5M | 1.0% | Mar 31, 2026 | |
| AQR CAPITAL MANAGEMENT LLC | 13F | 3,459,565 | +486,862 +16.4% | $913.0M | 1.0% | Mar 31, 2026 | |
| Capital Research Global Investors | 13F | 3,309,625 | +3,309,625 new | $895.1M | 1.0% | Mar 31, 2026 | |
| Amundi | 13F | 3,058,867 | +659,131 +27.5% | $827.4M | 0.9% | Mar 31, 2026 | |
| Nuveen, LLC | 13F | 2,959,245 | -1,604,231 -35.2% | $800.4M | 0.9% | Mar 31, 2026 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 13F | 2,902,748 | +93,339 +3.3% | $785.2M | 0.8% | Mar 31, 2026 | |
| D. E. Shaw & Co., Inc. | 13F | 2,688,230 | -3,013,088 -52.8% | $727.1M | 0.8% | Mar 31, 2026 | |
| FRED ALGER MANAGEMENT, LLC | 13F | 2,659,835 | -24,506 -0.9% | $719.5M | 0.8% | Mar 31, 2026 | |
| PRICE T ROWE ASSOCIATES INC /MD/ | 13F | 2,646,484 | +34,628 +1.3% | $715.8M | 0.8% | Mar 31, 2026 | |
| Bank of New York Mellon Corp | 13F | 2,508,752 | +435,716 +21.0% | $678.6M | 0.7% | Mar 31, 2026 | |
| DIMENSIONAL FUND ADVISORS LP | 13F | 2,503,321 | -1,062,021 -29.8% | $676.8M | 0.7% | Mar 31, 2026 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 13F | 2,206,941 | -59,768 -2.6% | $597.0M | 0.6% | Mar 31, 2026 | |
| Legal & General Group Plc | 13F | 2,129,170 | +95,615 +4.7% | $575.9M | 0.6% | Mar 31, 2026 | |
| VANGUARD FIDUCIARY TRUST CO | 13F | 1,908,325 | +1,908,325 new | $516.2M | 0.6% | Mar 31, 2026 | |
| DEUTSCHE BANK AG\ | 13F | 1,872,796 | -358,813 -16.1% | $506.6M | 0.5% | Mar 31, 2026 | |
| HSBC HOLDINGS PLC | 13F | 1,545,167 | +277,382 +21.9% | $417.0M | 0.4% | Mar 31, 2026 | |
| National Pension Service | 13F | 1,437,962 | -253,697 -15.0% | $389.0M | 0.4% | Mar 31, 2026 | |
| BANK OF MONTREAL /CAN/ | 13F | 1,405,042 | +373,990 +36.3% | $380.0M | 0.4% | Mar 31, 2026 | |
| Maple Rock Capital Partners Inc. | 13F | 1,400,434 | -981,091 -41.2% | $378.8M | 0.4% | Mar 31, 2026 | |
| AMF Tjanstepension AB | 13F | 1,373,910 | -394,049 -22.3% | $371.6M | 0.4% | Mar 31, 2026 | |
| Value Aligned Research Advisors, LLC | 13F | 1,295,439 | +1,295,439 new | $350.4M | 0.4% | Mar 31, 2026 | |
| ROYAL BANK OF CANADA | 13F | 1,271,074 | -711,979 -35.9% | $343.8M | 0.4% | Mar 31, 2026 | |
| BNP PARIBAS FINANCIAL MARKETS | 13F | 1,188,956 | -209,124 -15.0% | $321.6M | 0.3% | Mar 31, 2026 | |
| Soroban Capital Partners LP | 13F | 1,146,273 | +0 +0.0% | $310.1M | 0.3% | Mar 31, 2026 | |
| RENAISSANCE TECHNOLOGIES LLC | 13F | 1,146,133 | +153,600 +15.5% | $310.0M | 0.3% | Mar 31, 2026 | |
| BARCLAYS PLC | 13F | 1,050,033 | -476,351 -31.2% | $284.0M | 0.3% | Mar 31, 2026 | |
| WELLS FARGO & COMPANY/MN | 13F | 1,024,545 | +158,749 +18.3% | $277.1M | 0.3% | Mar 31, 2026 | |
| Swiss National Bank | 13F | 1,003,307 | +52,500 +5.5% | $271.4M | 0.3% | Mar 31, 2026 | |
| Robeco Institutional Asset Management B.V. | 13F | 984,685 | -392,066 -28.5% | $266.3M | 0.3% | Mar 31, 2026 | |
| Polar Capital Holdings Plc | 13F | 972,432 | +59,240 +6.5% | $263.0M | 0.3% | Mar 31, 2026 | |
| MARSHALL WACE, LLP | 13F | 931,323 | +769,455 +475.4% | $251.9M | 0.3% | Mar 31, 2026 | |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 13F | 891,662 | -133,785 -13.0% | $241.2M | 0.3% | Mar 31, 2026 | |
| Castle Hook Partners LP | 13F | 878,939 | -446,731 -33.7% | $237.7M | 0.3% | Mar 31, 2026 | |
| Sumitomo Mitsui Trust Group, Inc. | 13F | 836,666 | -50,393 -5.7% | $226.3M | 0.2% | Mar 31, 2026 | |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 13F | 827,668 | +412,055 +99.1% | $223.9M | 0.2% | Mar 31, 2026 |
Page 1 of 20
Derivatives Institutional Owners
13F put/call positions · excluded from ownership totals| Type | Period | |||||
|---|---|---|---|---|---|---|
| JANE STREET GROUP, LLC | Put | 6,809,400 | +1,096,300 +19.2% | $1.8B | Mar 31, 2026 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Put | 4,511,500 | +709,900 +18.7% | $1.2B | Mar 31, 2026 | |
| WELLS FARGO & COMPANY/MN | Put | 4,005,700 | +200 +0.0% | $1.1B | Mar 31, 2026 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Call | 4,004,300 | +408,800 +11.4% | $1.1B | Mar 31, 2026 | |
| CITADEL ADVISORS LLC | Put | 3,558,200 | -1,720,600 -32.6% | $962.5M | Mar 31, 2026 | |
| CITADEL ADVISORS LLC | Call | 2,023,900 | -1,533,400 -43.1% | $547.4M | Mar 31, 2026 | |
| JANE STREET GROUP, LLC | Call | 1,364,900 | -116,000 -7.8% | $369.2M | Mar 31, 2026 | |
| D. E. Shaw & Co., Inc. | Put | 1,125,200 | +293,200 +35.2% | $304.4M | Mar 31, 2026 | |
| Walleye Trading LLC | Call | 876,000 | -535,400 -37.9% | $101.7M | Mar 31, 2026 | |
| Walleye Trading LLC | Put | 811,400 | -828,100 -50.5% | $219.5M | Mar 31, 2026 | |
| UBS Group AG | Call | 391,294 | +163,194 +71.5% | $105.8M | Mar 31, 2026 | |
| Squarepoint Ops LLC | Put | 362,100 | -222,700 -38.1% | $97.9M | Mar 31, 2026 | |
| Squarepoint Ops LLC | Call | 309,900 | -218,000 -41.3% | $83.8M | Mar 31, 2026 | |
| MILLENNIUM MANAGEMENT LLC | Put | 297,000 | +136,700 +85.3% | $80.3M | Mar 31, 2026 | |
| GOLDMAN SACHS GROUP INC | Call | 296,200 | +40,900 +16.0% | $80.1M | Mar 31, 2026 | |
| Point72 Asset Management, L.P. | Put | 280,100 | -184,900 -39.8% | $75.8M | Mar 31, 2026 | |
| GOLDMAN SACHS GROUP INC | Put | 255,800 | -38,500 -13.1% | $69.2M | Mar 31, 2026 | |
| Point72 Asset Management, L.P. | Call | 205,000 | -95,200 -31.7% | $55.5M | Mar 31, 2026 | |
| Caption Management, LLC | Put | 200,000 | +0 +0.0% | $54.1M | Mar 31, 2026 | |
| MILLENNIUM MANAGEMENT LLC | Call | 159,400 | -137,800 -46.4% | $43.1M | Mar 31, 2026 | |
| PEAK6 LLC | Put | 153,300 | -93,400 -37.9% | $41.5M | Mar 31, 2026 | |
| HSBC HOLDINGS PLC | Put | 150,100 | +0 +0.0% | $40.5M | Mar 31, 2026 | |
| PINNBROOK CAPITAL MANAGEMENT LP | Call | 149,600 | +111,600 +293.7% | $40.5M | Mar 31, 2026 | |
| Parallax Volatility Advisers, L.P. | Call | 146,400 | -85,300 -36.8% | $39.6M | Mar 31, 2026 | |
| CAPITAL FUND MANAGEMENT S.A. | Put | 128,700 | -194,000 -60.1% | $34.8M | Mar 31, 2026 | |
| TUDOR INVESTMENT CORP ET AL | Put | 128,600 | -82,800 -39.2% | $34.8M | Mar 31, 2026 | |
| D. E. Shaw & Co., Inc. | Call | 119,300 | -242,000 -67.0% | $32.3M | Mar 31, 2026 | |
| Cavalier Investments, LLC | Call | 112,100 | +112,100 new | $30.3M | Mar 31, 2026 | |
| CAPITAL FUND MANAGEMENT S.A. | Call | 100,600 | -163,200 -61.9% | $27.2M | Mar 31, 2026 | |
| UBS Group AG | Put | 100,500 | -186,300 -65.0% | $27.2M | Mar 31, 2026 | |
| PEAK6 LLC | Call | 94,700 | -91,900 -49.2% | $25.6M | Mar 31, 2026 | |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Put | 90,000 | +90,000 new | $24.3M | Mar 31, 2026 | |
| TUDOR INVESTMENT CORP ET AL | Call | 86,000 | -316,600 -78.6% | $23.3M | Mar 31, 2026 | |
| Qube Research & Technologies Ltd | Put | 81,500 | -112,500 -58.0% | $22.0M | Mar 31, 2026 | |
| Alphadyne Asset Management LP | Put | 77,400 | +72,400 +1448.0% | $20.9M | Mar 31, 2026 | |
| NOMURA HOLDINGS INC | Put | 72,000 | -381,500 -84.1% | $19.5M | Mar 31, 2026 | |
| Qube Research & Technologies Ltd | Call | 63,200 | -72,700 -53.5% | $17.1M | Mar 31, 2026 | |
| Cavalier Investments, LLC | Put | 62,100 | -17,900 -22.4% | $16.8M | Mar 31, 2026 | |
| CITIGROUP INC | Call | 58,000 | -250,000 -81.2% | $15.7M | Mar 31, 2026 | |
| Alphadyne Asset Management LP | Call | 53,600 | +43,700 +441.4% | $14.5M | Mar 31, 2026 | |
| CAPSTONE INVESTMENT ADVISORS, LLC | Put | 46,600 | -41,400 -47.0% | $12.6M | Mar 31, 2026 | |
| Walleye Capital LLC | Call | 43,100 | -34,100 -44.2% | $11.7M | Mar 31, 2026 | |
| Invesco Ltd. | Call | 39,500 | -35,500 -47.3% | $10.7M | Mar 31, 2026 | |
| Walleye Capital LLC | Put | 39,200 | -67,600 -63.3% | $10.6M | Mar 31, 2026 | |
| WELLS FARGO & COMPANY/MN | Call | 33,000 | +0 +0.0% | $8.9M | Mar 31, 2026 | |
| B. Riley Wealth Advisors, Inc. | Call | 30,000 | +30,000 new | $75.5K | Mar 31, 2026 | |
| Oribel Capital Management, LP | Put | 28,200 | +28,200 new | $7.6M | Mar 31, 2026 | |
| MARSHALL WACE, LLP | Call | 21,900 | -4,900 -18.3% | $5.9M | Mar 31, 2026 | |
| Balyasny Asset Management L.P. | Call | 19,100 | -12,900 -40.3% | $5.2M | Mar 31, 2026 | |
| NOMURA HOLDINGS INC | Call | 17,900 | -655,600 -97.3% | $4.8M | Mar 31, 2026 |
Page 1 of 2
Ownership Events — 13G / 13D
Event-driven, scanned dailyVanguard Capital Management crosses 5.0% Initial Schedule 13G · 25,402,917 shares reported | 13G | Apr 30, 2026 |
Vanguard Portfolio Management crosses 5.0% Initial Schedule 13G · 17,217,120 shares reported | 13G | Apr 29, 2026 |
MANAGED ACCOUNT ADVISORS LLC falls below 5% (from 5.3%) Schedule 13G/A · position exited | 13G/A | Feb 10, 2026 |
FMR LLC reports 10.1% (from 7.0%) Schedule 13G/A · amendment | 13G/A | Jan 8, 2026 |
MANAGED ACCOUNT ADVISORS LLC reports 5.3% (from 6.4%) Schedule 13G/A · amendment | 13G/A | Nov 13, 2025 |
FMR LLC reports 7.0% (from 9.5%) Schedule 13G/A · amendment | 13G/A | Nov 5, 2025 |
MANAGED ACCOUNT ADVISORS LLC crosses 5.0% Initial Schedule 13G · 22,178,966 shares reported | 13G | Aug 14, 2025 |
FMR LLC reports 9.5% (from 8.1%) Schedule 13G/A · amendment | 13G/A | Aug 6, 2025 |
FMR LLC reports 8.1% (from 6.9%) Schedule 13G/A · amendment | 13G/A | May 12, 2025 |
JPMORGAN CHASE & CO. reports 5.3% (from 6.7%) Schedule 13G/A · amendment | 13G/A | Apr 22, 2025 |
Quarterly holdings from SEC Form 13F-HR structured data sets (filed within 45 days of quarter end); 5%+ ownership events from Schedule 13G/13D filings scanned daily via EDGAR. Each row links to the source filing. Est. Avg Cost is a rolling-average estimate — each quarter's added shares priced at that quarter's 13F value ÷ shares, split-adjusted, with history beginning 2024-Q2; positions with one quarter of history or a data-quality flag show “—”.