Bokf, Na reports 5,794.29% increase in ownership of WDC / Western Digital Corporation

Western Digital Corporation

MX ˙ BMV ˙ US9581021055

Security	MX:WDC / Western Digital Corporation
Institution	Bokf, Na
Latest Disclosed Ownership	16,504 shares
Latest Disclosed Value	$ 4,464,167

On May 8, 2026 - Bokf, Na filed a 13F-HR form disclosing ownership of 16,504 shares of Western Digital Corporation (MX:WDC) valued at $4,464,167 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 280 shares of Western Digital Corporation. This represents a change in shares of 5,794.29% during the quarter.

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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-08	2026-03-31	13F	WESTERN DIGITAL	common	958102105	16,504	16,224	5,794.29	4,464	9,200.00	0.0526
2026-02-03	2025-12-31	13F	WESTERN DIGITAL	common	958102105	280	8	2.94	48	50.00	0.0007
2025-11-13	2025-09-30	13F	WESTERN DIGITAL	common	958102105	272	268	6,700.00	33		0.0005
2025-08-12	2025-06-30	13F	WESTERN DIGITAL	common	958102105	4	-33	-89.19	0	-100.00	0.0000
2025-05-13	2025-03-31	13F	WESTERN DIGITAL	common	958102105	37	37		1		0.0000
2025-02-14	2024-12-31	13F	WESTERN DIGITAL	common	958102105	0	-6	-100.00	0		0.0000
2024-11-14	2024-09-30	13F	WESTERN DIGITAL	common	958102105	6	6		0		0.0000
2024-08-08	2024-06-30	13F	WESTERN DIGITAL	COM	958102105	0	-33	-100.00	0	-100.00
2024-05-15	2024-03-31	13F	WESTERN DIGITAL	COM	958102105	33	-87	-72.50	2	-66.67	0.0000
2024-02-14	2023-12-31	13F	WESTERN DIGITAL	COM	958102105	120	120		6		0.0001
2023-11-14	2023-09-30	13F	WESTERN DIGITAL	COM	958102105	0	-32,622	-100.00	0	-100.00
2023-08-21	2023-06-30	13F	WESTERN DIGITAL	COM	958102105	32,622	-7,603	-18.90	1,237	-18.35	0.0252
2023-05-11	2023-03-31	13F	WESTERN DIGITAL	COM	958102105	40,225	-22,674	-36.05	1,515	-23.64	0.0317
2023-02-13	2022-12-31	13F	WESTERN DIGITAL	COM	958102105	62,899	-13,697	-17.88	1,984	-20.45	0.0366
2022-11-14	2022-09-30	13F	WESTERN DIGITAL	COM	958102105	76,596	29,039	61.06	2,494	16.98	0.0505
2022-08-11	2022-06-30	13F	WESTERN DIGITAL	COM	958102105	47,557	-7,345	-13.38	2,132	-21.79	0.0409
2022-05-13	2022-03-31	13F	WESTERN DIGITAL	COM	958102105	54,902	54,902		2,726		0.0449
2021-11-10	2021-09-30	13F	WESTERN DIGITAL	COM	958102105	0	-11,221	-100.00	0	-100.00
2021-04-21	2021-03-31	13F	WESTERN DIGITAL	COM	958102105	11,221	-6,649	-37.21	749	-24.34	0.0136
2021-02-12	2020-12-31	13F	WESTERN DIGITAL	COM	958102105	17,870	242	1.37	990	53.49	0.0189
2020-10-30	2020-09-30	13F	WESTERN DIGITAL	COM	958102105	17,628	17,628		645		0.0142
2020-05-13	2020-03-31	13F	WESTERN DIGITAL	COM	958102105	0	-9,045	-100.00	0	-100.00
2020-02-12	2019-12-31	13F	WESTERN DIGITAL	COM	958102105	9,045	681	8.14	574	15.03	0.0130
2019-11-13	2019-09-30	13F	WESTERN DIGITAL	COM	958102105	8,364	-7,352	-46.78	499	-33.29	0.0120
2019-08-14	2019-06-30	13F	WESTERN DIGITAL	COM	958102105	15,716	3,079	24.36	748	23.23	0.0180
2019-05-15	2019-03-31	13F	WESTERN DIGITAL	COM	958102105	12,637	12,637		607		0.0145
2018-11-13	2018-09-30	13F	WESTERN DIGITAL	COM	958102105	0	-9,977	-100.00	0	-100.00
2018-08-13	2018-06-30	13F	WESTERN DIGITAL	COM	958102105	9,977	168	1.71	772	-14.70	0.0208
2018-05-14	2018-03-31	13F	WESTERN DIGITAL	COM	958102105	9,809	-6,502	-39.86	905	-30.22	0.0257
2018-02-14	2017-12-31	13F	WESTERN DIGITAL	COM	958102105	16,311	-54	-0.33	1,297	-8.27	0.0357
2017-11-14	2017-09-30	13F	WESTERN DIGITAL	COM	958102105	16,365	-1,119	-6.40	1,414	-8.72	0.0411
2017-08-14	2017-06-30	13F	WESTERN DIGITAL	COM	958102105	17,484	7,571	76.37	1,549	89.36	0.0487
2017-05-15	2017-03-31	13F	WESTERN DIGITAL	COM	958102105	9,913	-412	-3.99	818	16.52	0.0255
2017-02-14	2016-12-31	13F	WESTERN DIGITAL	COM	958102105	10,325	114	1.12	702	17.59	0.0231
2016-11-10	2016-09-30	13F	WESTERN DIGITAL	COM	958102105	10,211	-1,445	-12.40	597	8.35	0.0198
2016-08-12	2016-06-30	13F	WESTERN DIGITAL	COM	958102105	11,656	765	7.02	551	7.20	0.0194
2016-05-13	2016-03-31	13F	WESTERN DIGITAL	COM	958102105	10,891	10,891		514		0.0186

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.