Western Digital Corporation
MX ˙ BMV ˙ US9581021055
SecurityMX:WDC / Western Digital Corporation
InstitutionCreative Planning
Latest Disclosed Ownership131,649 shares
Latest Disclosed Value $ 35,609,611
Creative Planning ownership in WDC / Western Digital Corporation

On May 12, 2026 - Creative Planning filed a 13F-HR form disclosing ownership of 131,649 shares of Western Digital Corporation (MX:WDC) valued at $35,609,611 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 106,858 shares of Western Digital Corporation. This represents a change in shares of 23.20% during the quarter.

Creative Planning has a history of taking positions in derivatives of the underlying security (WDC) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:WDC / Western Digital Corporation Historical Put/Call Ratio
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)
2026-05-12 2026-03-31 13F WESTERN DIGITAL COM 958102105 131,649 24,791 23.20 35,610 93.44 0.0237
2026-02-17 2025-12-31 13F WESTERN DIGITAL COM 958102105 106,858 27,316 34.34 18,408 92.77 0.0132
2025-11-14 2025-09-30 13F WESTERN DIGITAL COM 958102105 79,542 17,263 27.72 9,550 139.62 0.0073
2025-08-08 2025-06-30 13F WESTERN DIGITAL COM 958102105 62,279 16,609 36.37 3,985 115.87 0.0034
2025-05-15 2025-03-31 13F WESTERN DIGITAL COM 958102105 45,670 3,885 9.30 1,846 -25.89 0.0017
2025-02-14 2024-12-31 13F WESTERN DIGITAL COM 958102105 41,785 -623 -1.47 2,492 -13.98 0.0024
2024-10-11 2024-09-30 13F WESTERN DIGITAL COM 958102105 42,408 1,835 4.52 2,896 -5.79 0.0029
2024-08-15 2024-06-30 13F WESTERN DIGITAL COM 958102105 40,573 7,037 20.98 3,074 34.35 0.0033
2024-05-13 2024-03-31 13F WESTERN DIGITAL COM 958102105 33,536 7,451 28.56 2,288 67.50 0.0025
2024-02-14 2023-12-31 13F WESTERN DIGITAL COM 958102105 26,085 1,896 7.84 1,366 23.84 0.0025
2023-11-16 2023-09-30 13F WESTERN DIGITAL COM 958102105 24,189 4,796 24.73 1,104 50.07 0.0015
2023-07-21 2023-06-30 13F WESTERN DIGITAL COM 958102105 19,393 3,698 23.56 736 24.37 0.0010
2023-05-15 2023-03-31 13F WESTERN DIGITAL COM 958102105 15,695 1,509 10.64 591 32.21 0.0009
2023-02-10 2022-12-31 13F WESTERN DIGITAL COM 958102105 14,186 439 3.19 448 0.00 0.0007
2022-11-03 2022-09-30 13F WESTERN DIGITAL COM 958102105 13,747 -1,610 -10.48 447 -35.03 0.0008
2022-08-15 2022-06-30 13F WESTERN DIGITAL COM 958102105 15,357 -7,215 -31.96 688 -38.63 0.0011
2022-05-16 2022-03-31 13F WESTERN DIGITAL COM 958102105 22,572 -3,059 -11.93 1,121 -32.91 0.0017
2022-02-11 2021-12-31 13F WESTERN DIGITAL COM 958102105 25,631 1,214 4.97 1,671 21.26 0.0027
2021-11-10 2021-09-30 13F WESTERN DIGITAL COM 958102105 24,417 -16,510 -40.34 1,378 -52.69 0.0024
2021-08-04 2021-06-30 13F WESTERN DIGITAL COM 958102105 40,927 -47,251 -53.59 2,913 -50.51 0.0052
2021-04-30 2021-03-31 13F CreativePlanning COM 958102105 88,178 18,099 25.83 5,886 51.62 0.0119
2021-01-29 2020-12-31 13F WESTERN DIGITAL COM 958102105 70,079 26,962 62.53 3,882 146.32 0.0085
2020-11-05 2020-09-30 13F WESTERN DIGITAL COM 958102105 43,117 -49,430 -53.41 1,576 -61.43 0.0041
2020-07-23 2020-06-30 13F WESTERN DIGITAL COM 958102105 92,547 22,570 32.25 4,086 40.32 0.0118
2020-05-05 2020-03-31 13F WESTERN DIGITAL COM 958102105 69,977 16,546 30.97 2,912 -14.13 0.0103
2020-01-30 2019-12-31 13F WESTERN DIGITAL COM 958102105 53,431 10,773 25.25 3,391 33.29 0.0102
2019-11-01 2019-09-30 13F WESTERN DIGITAL COM 958102105 42,658 -6,253 -12.78 2,544 9.37 0.0083
2019-07-26 2019-06-30 13F WESTERN DIGITAL COM 958102105 48,911 -5,075 -9.40 2,326 -10.37 0.0078
2019-04-24 2019-03-31 13F WESTERN DIGITAL COM 958102105 53,986 6,267 13.13 2,595 47.11 0.0094
2019-02-12 2018-12-31 13F/A-1 WESTERN DIGITAL COM 958102105 47,719 -18,519 -27.96 1,764 -54.51 0.0072
2019-02-01 2018-12-31 13F WESTERN DIGITAL COM 958102105 47,719 -18,519 1,764
2018-10-25 2018-09-30 13F WESTERN DIGITAL COM 958102105 66,238 10,311 18.44 3,878 -10.42 0.0144
2018-07-20 2018-06-30 13F WESTERN DIGITAL COM 958102105 55,927 3,633 6.95 4,329 -10.28 0.0170
2018-04-18 2018-03-31 13F WESTERN DIGITAL COM 958102105 52,294 -371 -0.70 4,825 15.21 0.0196
2018-01-17 2017-12-31 13F WESTERN DIGITAL COM 958102105 52,665 -4,161 -7.32 4,188 -14.70 0.0180
2017-10-17 2017-09-30 13F WESTERN DIGITAL COM 958102105 56,826 18,132 46.86 4,910 43.23 0.0228
2017-07-12 2017-06-30 13F WESTERN DIGITAL COM 958102105 38,694 2,218 6.08 3,428 13.89 0.0174
2017-04-07 2017-03-31 13F WESTERN DIGITAL COM 958102105 36,476 3,017 9.02 3,010 32.37 0.0164
2017-01-09 2016-12-31 13F WESTERN DIGITAL COM 958102105 33,459 -7,941 -19.18 2,274 -6.07 0.0139
2016-10-12 2016-09-30 13F WESTERN DIGITAL COM 958102105 41,400 2,322 5.94 2,421 31.08 0.0154
2016-07-12 2016-06-30 13F WESTERN DIGITAL COM 958102105 39,078 19,877 103.52 1,847 103.64 0.0134
2016-04-08 2016-03-31 13F WESTERN DIGITAL COM 958102105 19,201 4,940 34.64 907 5.96 0.0071
2016-01-11 2015-12-31 13F WESTERN DIGITAL COM 958102105 14,261 4,450 45.36 856 9.88 0.0070
2015-10-09 2015-09-30 13F WESTERN DIGITAL COM 958102105 9,811 -686 -6.54 779 -5.35 0.0069
2015-07-09 2015-06-30 13F WESTERN DIGITAL COM 958102105 10,497 -43 -0.41 823 -14.18 0.0075
2015-04-13 2015-03-31 13F WESTERN DIGITAL COM 958102105 10,540 10,540 0.00 959 0.0090
2015-01-29 2014-12-31 13F WESTERN DIGITAL COM 958102105 0 -7,457 -100.00 0 -100.00
2014-10-10 2014-09-30 13F WESTERN DIGITAL COM 958102105 7,457 -743 -9.06 726 -4.10 0.0084
2014-08-20 2014-06-30 13F WESTERN DIGITAL COM 958102105 8,200 -395 -4.60 757 -4.06 0.0098
2014-04-11 2014-03-31 13F WESTERN DIGITAL COM 958102105 8,595 -615 -6.68 789 2.07 0.0119
2014-01-06 2013-12-31 13F WESTERN DIGITAL COM 958102105 9,210 6,158 201.77 773 300.52 0.0132
2013-10-10 2013-09-30 13F WESTERN DIGITAL COM 958102105 3,052 -100 -3.17 193 -1.53 0.0038
2013-07-09 2013-06-30 13F WESTERN DIGITAL COM 958102105 3,152 3,152 196 0.0046
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2021-08-04 2021-06-30 13F CreativePlanning COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-04-30 2021-03-31 13F CreativePlanning COM Call 300 0.00 11 37.50 n/a n/a n/a
2021-01-29 2020-12-31 13F WESTERN DIGITAL COM Call 300 8 n/a n/a n/a
2019-07-26 2019-06-30 13F WESTERN DIGITAL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-04-24 2019-03-31 13F WESTERN DIGITAL COM Call 1,100 0.00 8 n/a n/a n/a
2019-02-12 2018-12-31 13F/A WESTERN DIGITAL COM Call 1,100 -52.17 0 -100.00 n/a n/a n/a
2019-02-01 2018-12-31 13F WESTERN DIGITAL COM Call 1,100 0 n/a n/a n/a
2018-10-25 2018-09-30 13F WESTERN DIGITAL COM Call 2,300 91.67 11 22.22 n/a n/a n/a
2018-07-20 2018-06-30 13F WESTERN DIGITAL COM Call 1,200 9 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2016-10-12 2016-09-30 13F WESTERN DIGITAL COM Put 0 -100.00 0 n/a n/a n/a
2016-07-12 2016-06-30 13F WESTERN DIGITAL COM Put 100 -90.00 0 -100.00 n/a n/a n/a
2014-04-11 2014-03-31 13F WESTERN DIGITAL COM Put 1,000 1 n/a n/a n/a
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.