Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionState Street Corp
Latest Disclosed Ownership11,632,749 shares
Ownership 3.93%
State Street Corp ownership in WDC / Western Digital Corporation

2018-02-13 - State Street Corp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 11,632,749 shares of Western Digital Corporation (MX:WDC). This represents 3.93 percent ownership of the company. In their previous filing dated 2017-02-10 , State Street Corp had reported owning 14,863,320 shares, indicating a decrease of -21.74 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2018-02-13 2018-02-13 13G/A 14,863,320 11,632,749 -21.74 3.93 -24.57
2017-02-10 2017-02-10 13G 14,863,320 5.21

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F WESTERN DIGITAL COM 958102105 15,465,766 -230,188 -1.47 4,183,335 54.71 0.1444
2026-02-13 2025-12-31 13F WESTERN DIGITAL COM 958102105 15,695,954 234,097 1.51 2,703,942 45.66 0.0907
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 15,461,857 277,335 1.83 1,856,351 91.05 0.0644
2025-08-14 2025-06-30 13F WESTERN DIGITAL COM 958102105 15,184,522 288,305 1.94 971,658 61.34 0.0364
2025-05-15 2025-03-31 13F WESTERN DIGITAL COM 958102105 14,896,217 111,667 0.76 602,254 -31.69 0.0248
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 14,784,550 1,211,864 8.93 881,601 -4.88 0.0348
2024-11-14 2024-09-30 13F WESTERN DIGITAL COM 958102105 13,572,686 423,651 3.22 926,879 -6.97 0.0377
2024-08-14 2024-06-30 13F WESTERN DIGITAL COM 958102105 13,149,035 228,540 1.77 996,302 13.00 0.0435
2024-05-15 2024-03-31 13F WESTERN DIGITAL COM 958102105 12,920,495 179,006 1.40 881,695 32.13 0.0394
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 12,741,489 216,932 1.73 667,272 16.76 0.0325
2023-11-14 2023-09-30 13F WESTERN DIGITAL COM 958102105 12,524,557 -295,259 -2.30 571,496 17.53 0.0317
2023-08-14 2023-06-30 13F WESTERN DIGITAL COM 958102105 12,819,816 21,291 0.17 486,256 0.86 0.0255
2023-05-15 2023-03-31 13F WESTERN DIGITAL COM 958102105 12,798,525 404,895 3.27 482,120 23.30 0.0272
2023-05-15 2022-12-31 13F/A-99 WESTERN DIGITAL COM 958102105 12,393,630 -8,270 -0.07 391,019 -3.14 0.0230
2023-05-15 2022-12-31 13F WESTERN DIGITAL COM 958102105 12,393,630 -8,270 391,019 0.0230
2022-11-15 2022-09-30 13F WESTERN DIGITAL COM 958102105 12,401,900 -61,239 -0.49 403,682 -27.75 0.0255
2022-08-15 2022-06-30 13F WESTERN DIGITAL COM 958102105 12,463,139 -532,914 -4.10 558,723 -13.41 0.0335
2022-05-16 2022-03-31 13F WESTERN DIGITAL COM 958102105 12,996,053 389,734 3.09 645,254 -21.51 0.0319
2022-02-14 2021-12-31 13F WESTERN DIGITAL COM 958102105 12,606,319 584,448 4.86 822,058 21.16 0.0390
2021-11-15 2021-09-30 13F WESTERN DIGITAL COM 958102105 12,021,871 124,225 1.04 678,514 -19.87 0.0359
2021-08-16 2021-06-30 13F WESTERN DIGITAL COM 958102105 11,897,646 104,119 0.88 846,755 7.56 0.0446
2021-07-09 2021-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 11,793,527 -233,524 -1.94 787,218 18.17 0.0451
2021-05-17 2021-03-31 13F WESTERN DIGITAL COM 958102105 11,793,527 -233,524 787,218 0.0451
2021-02-16 2020-12-31 13F WESTERN DIGITAL COM 958102105 12,027,051 -305,696 -2.48 666,178 47.79 0.0408
2020-11-10 2020-09-30 13F WESTERN DIGITAL COM 958102105 12,332,747 -179,652 -1.44 450,762 -18.40 0.0308
2020-08-14 2020-06-30 13F WESTERN DIGITAL COM 958102105 12,512,399 108,013 0.87 552,422 7.00 0.0402
2020-06-19 2020-03-31 13F/A-1 WESTERN DIGITAL COM 958102105 12,404,386 -702,022 -5.36 516,271 -37.94 0.0452
2020-05-11 2020-03-31 13F WESTERN DIGITAL COM 958102105 12,404,386 -702,022 516,271 45,338.9890
2020-02-06 2019-12-31 13F WESTERN DIGITAL COM 958102105 13,106,408 219,319 1.70 831,864 8.23 0.0570
2019-11-14 2019-09-30 13F WESTERN DIGITAL COM 958102105 12,887,089 -106,240 -0.82 768,586 23.12 0.0573
2019-08-14 2019-06-30 13F WESTERN DIGITAL COM 958102105 12,993,329 147,898 1.15 624,249 0.10 0.0465
2019-05-15 2019-03-31 13F WESTERN DIGITAL COM 958102105 12,845,431 986,015 8.31 623,637 40.34 0.0487
2019-02-12 2018-12-31 13F WESTERN DIGITAL COM 958102105 11,859,416 -1,822 -0.02 444,381 -36.00 0.0405
2018-11-09 2018-09-30 13F WESTERN DIGITAL Common equity shares 958102105 11,861,238 571,066 5.06 694,359 -20.55 0.0533
2018-08-14 2018-06-30 13F WESTERN DIGITAL Common equity shares 958102105 11,290,172 10,169 0.09 873,973 -16.03 0.0731
2018-05-15 2018-03-31 13F WESTERN DIGITAL Common equity shares 958102105 11,280,003 -345,693 -2.97 1,040,806 12.57 0.0884
2018-02-14 2017-12-31 13F WESTERN DIGITAL Common equity shares 958102105 11,625,696 51,371 0.44 924,586 -7.54 0.0744
2017-11-14 2017-09-30 13F WESTERN DIGITAL Common equity shares 958102105 11,574,325 -214,060 -1.82 1,000,024 -4.25 0.0863
2017-08-14 2017-06-30 13F WESTERN DIGITAL Common equity shares 958102105 11,788,385 -639,379 -5.14 1,044,451 1.81 0.0924
2017-05-15 2017-03-31 13F WESTERN DIGITAL Common equity shares 958102105 12,427,764 -2,432,618 -16.37 1,025,897 1.45 0.0915
2017-02-09 2016-12-31 13F WESTERN DIGITAL Common equity shares 958102105 14,860,382 994,472 7.17 1,011,249 24.52 0.0952
2017-01-13 2016-09-30 13F/A-1 WESTERN DIGITAL Common equity shares 958102105 13,865,910 3,098,372 28.78 812,088 59.58 0.0818
2016-11-14 2016-09-30 13F WESTERN DIGITAL Common equity shares 958102105 10,887,974 637,968
2016-08-12 2016-06-30 13F WESTERN DIGITAL Common equity shares 958102105 10,767,538 772,439 7.73 508,875 7.77 0.0547
2016-05-20 2016-03-31 13F/A-1 WESTERN DIGITAL Common equity shares 958102105 9,995,099 394,792 4.11 472,182 -18.09 0.0511
2016-05-12 2016-03-31 13F WESTERN DIGITAL Common equity shares 958102105 9,995,099 472,182
2016-02-16 2015-12-31 13F WESTERN DIGITAL Common equity shares 958102105 9,600,307 191,910 2.04 576,488 -22.87 0.0630
2015-11-16 2015-09-30 13F WESTERN DIGITAL Common equity shares 958102105 9,408,397 -72,826 -0.77 747,409 0.52 0.0870
2015-08-13 2015-06-30 13F WESTERN DIGITAL Common equity shares 958102105 9,481,223 -287,058 -2.94 743,524 -16.36 0.0795
2015-05-15 2015-03-31 13F WESTERN DIGITAL Common equity shares 958102105 9,768,281 -339,635 -3.36 889,004 -20.55 0.0912
2015-02-11 2014-12-31 13F WESTERN DIGITAL Common equity shares 958102105 10,107,916 145,590 1.46 1,118,945 15.41 0.1114
2014-11-12 2014-09-30 13F/A-1 WESTERN DIGITAL Common equity shares 958102105 9,962,326 250,194 2.58 969,530 8.15 0.1043
2014-11-10 2014-09-30 13F WESTERN DIGITAL Common equity shares 958102105 9,962,326 969,530
2014-08-12 2014-06-30 13F WESTERN DIGITAL Common equity shares 958102105 9,712,132 971,357 11.11 896,430 11.69 0.0968
2014-05-15 2014-03-31 13F/A-1 WESTERN DIGITAL Common equity shares 958102105 8,740,775 -598,362 -6.41 802,570 2.43 0.0912
2014-05-13 2014-03-31 13F WESTERN DIGITAL Common equity shares 958102105 8,740,775 802,570
2014-02-06 2013-12-31 13F/A-1 WESTERN DIGITAL Common equity shares 958102105 9,339,137 147,985 1.61 783,558 34.47 0.0872
2014-02-06 2013-12-31 13F WESTERN DIGITAL Common equity shares 958102105 9,033,603 383,825
2013-11-12 2013-09-30 13F WESTERN DIGITAL Common Stock 958102105 9,191,152 323,471 3.65 582,718 5.84 0.0718
2013-08-08 2013-06-30 13F WESTERN DIGITAL Common Stock 958102105 8,867,681 8,867,681 550,586 0.0718
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.