Conning Inc. reports 12.13% decrease in ownership of WDC / Western Digital Corporation

Western Digital Corporation

MX ˙ BMV ˙ US9581021055

Security	MX:WDC / Western Digital Corporation
Institution	Conning Inc.
Latest Disclosed Ownership	1,616 shares
Latest Disclosed Value	$ 437,111

On April 30, 2026 - Conning Inc. filed a 13F-HR form disclosing ownership of 1,616 shares of Western Digital Corporation (MX:WDC) valued at $437,111 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 1,839 shares of Western Digital Corporation. This represents a change in shares of -12.13% 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 (%)
2026-04-30	2026-03-31	13F	WESTERN DIGITAL	COM	958102105	1,616	-223	-12.13	437	38.29	0.0145
2026-02-05	2025-12-31	13F	WESTERN DIGITAL	COM	958102105	1,839	-191	-9.41	317	30.04	0.0106
2025-10-28	2025-09-30	13F	WESTERN DIGITAL	COM	958102105	2,030	2,030		244		0.0081
2022-05-02	2022-03-31	13F	WESTERN DIGITAL	COM	958102105	0	-3,154	-100.00	0	-100.00
2022-01-27	2021-12-31	13F	WESTERN DIGITAL	COM	958102105	3,154	3,154		206		0.0055
2021-11-04	2021-09-30	13F	WESTERN DIGITAL	COM	958102105	0	-3,792	-100.00	0	-100.00
2021-07-29	2021-06-30	13F	WESTERN DIGITAL	COM	958102105	3,792	-355	-8.56	270	-2.53	0.0078
2021-04-23	2021-03-31	13F	WESTERN DIGITAL	COM	958102105	4,147	-430	-9.39	277	9.06	0.0083
2021-01-28	2020-12-31	13F	WESTERN DIGITAL	COM	958102105	4,577	4,577		254		0.0081
2020-04-29	2020-03-31	13F	WESTERN DIGITAL	COM	958102105	0	-4,726	-100.00	0	-100.00
2020-01-29	2019-12-31	13F	WESTERN DIGITAL	COM	958102105	4,726	-239	-4.81	300	1.35	0.0098
2019-10-30	2019-09-30	13F	WESTERN DIGITAL	COM	958102105	4,965	-119	-2.34	296	22.31	0.0102
2019-07-25	2019-06-30	13F	WESTERN DIGITAL	COM	958102105	5,084	-709	-12.24	242	-12.95	0.0080
2019-04-22	2019-03-31	13F	WESTERN DIGITAL	COM	958102105	5,793	50	0.87	278	31.13	0.0087
2019-01-29	2018-12-31	13F	WESTERN DIGITAL	COM	958102105	5,743	-1,702	-22.86	212	-51.38	0.0072
2018-10-26	2018-09-30	13F	WESTERN DIGITAL	COM	958102105	7,445	-323	-4.16	436	-27.45	0.0129
2018-07-25	2018-06-30	13F	WESTERN DIGITAL	COM	958102105	7,768	-190	-2.39	601	-18.12	0.0183
2018-05-03	2018-03-31	13F	WESTERN DIGITAL	COM	958102105	7,958	-1,100	-12.14	734	1.94	0.0236
2018-01-30	2017-12-31	13F	WESTERN DIGITAL	COM	958102105	9,058	1,030	12.83	720	3.75	0.0238
2017-10-20	2017-09-30	13F	WESTERN DIGITAL	COM	958102105	8,028	40	0.50	694	-1.98	0.0236
2017-08-03	2017-06-30	13F	WESTERN DIGITAL	COM	958102105	7,988	12	0.15	708	7.60	0.0257
2017-04-27	2017-03-31	13F	WESTERN DIGITAL	COM	958102105	7,976	-130	-1.60	658	19.42	0.0243
2017-02-02	2016-12-31	13F	WESTERN DIGITAL	COM	958102105	8,106	0	0.00	551	16.24	0.0220
2016-10-25	2016-09-30	13F	WESTERN DIGITAL	COM	958102105	8,106	200	2.53	474	26.74	0.0189
2016-07-26	2016-06-30	13F	WESTERN DIGITAL	COM	958102105	7,906	1,282	19.35	374	19.49	0.0154
2016-04-26	2016-03-31	13F	WESTERN DIGITAL	COM	958102105	6,624	10	0.15	313	-21.16	0.0131
2016-02-04	2015-12-31	13F	WESTERN DIGITAL	COM	958102105	6,614	-190	-2.79	397	-26.62	0.0170
2015-10-23	2015-09-30	13F	WESTERN DIGITAL	COM	958102105	6,804	-960	-12.36	541	-11.17	0.0238
2015-08-03	2015-06-30	13F	WESTERN DIGITAL	COM	958102105	7,764	460	6.30	609	-8.42	0.0250
2015-04-24	2015-03-31	13F	WESTERN DIGITAL	COM	958102105	7,304	-30	-0.41	665	-18.10	0.0283
2015-02-13	2014-12-31	13F	WESTERN DIGITAL	COM	958102105	7,334	-60	-0.81	812	12.78	0.0396
2014-11-07	2014-09-30	13F	WESTERN DIGITAL	COM	958102105	7,394	-120	-1.60	720	3.75	0.0377
2014-07-25	2014-06-30	13F	WESTERN DIGITAL	COM	958102105	7,514	-350	-4.45	694	-3.88	0.0369
2014-04-25	2014-03-31	13F	WESTERN DIGITAL	COM	958102105	7,864	300	3.97	722	13.70	0.0424
2014-02-04	2013-12-31	13F	WESTERN DIGITAL	COM	958102105	7,564	1,090	16.84	635	54.88	0.0393
2013-11-04	2013-09-30	13F	WESTERN DIGITAL	COM	958102105	6,474	120	1.89	410	3.80	0.0317
2013-08-13	2013-06-30	13F	WESTERN DIGITAL	COM	958102105	6,354	6,354		395		0.0326

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.