Woodstock Corp reports 1.06% decrease in ownership of COST / Costco Wholesale Corporation

코스트코 도매공사

MX ˙ BMV ˙ US22160K1051

Security	MX:COST / Costco Wholesale Corporation
Institution	Woodstock Corp
Latest Disclosed Ownership	21,931 shares
Latest Disclosed Value	$ 21,852,745

On April 8, 2026 - Woodstock Corp filed a 13F-HR form disclosing ownership of 21,931 shares of Costco Wholesale Corporation (MX:COST) valued at $21,852,745 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 22,165 shares of Costco Wholesale Corporation. This represents a change in shares of -1.06% 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 (%)
2026-04-08	2026-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	21,931	-234	-1.06	21,853	14.33	1.9451
2026-01-14	2025-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,165	30	0.14	19,114	-6.71	1.6403
2025-10-07	2025-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,135	-148	-0.66	20,489	-7.12	1.7754
2025-07-09	2025-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,283	-188	-0.84	22,059	3.79	2.0274
2025-04-09	2025-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,471	439	1.99	21,253	5.28	2.0994
2025-01-15	2024-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,032	146	0.67	20,187	4.05	1.9447
2024-10-11	2024-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	21,886	-366	-1.64	19,402	2.59	1.8669
2024-07-08	2024-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,252	-371	-1.64	18,914	14.11	1.9233
2024-04-09	2024-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,623	-11	-0.05	16,574	10.94	1.7157
2024-01-08	2023-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,634	102	0.45	14,940	17.37	1.7301
2023-10-10	2023-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,532	-244	-1.07	12,730	3.81	1.5963
2023-07-07	2023-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,776	-11	-0.05	12,262	8.30	1.4469
2023-04-06	2023-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,787	104	0.46	11,322	9.35	1.4439
2023-01-10	2022-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,683	-121	-0.53	10,355	-3.86	1.3762
2022-10-11	2022-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	22,804	-332	-1.43	10,770	-2.88	1.6023
2022-07-11	2022-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	23,136	-244	-1.04	11,089	-17.63	1.5391
2022-04-07	2022-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	23,380	-3,465	-12.91	13,463	-11.66	1.5766
2022-01-07	2021-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	26,845	-16	-0.06	15,240	26.26	1.5957
2021-10-05	2021-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	26,861	-432	-1.58	12,070	11.77	1.4076
2021-07-06	2021-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	27,293	-185	-0.67	10,799	11.50	1.2707
2021-04-05	2021-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	27,478	293	1.08	9,685	-5.45	1.2313
2021-01-06	2020-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	27,185	1,118	4.29	10,243	10.69	1.3710
2020-10-02	2020-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	26,067	-190	-0.72	9,254	16.24	1.4944
2020-07-07	2020-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	26,257	180	0.69	7,961	7.07	1.3571
2020-04-03	2020-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	26,077	-540	-2.03	7,435	-4.96	1.5150
2020-01-13	2019-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	26,617	105	0.40	7,823	2.42	1.2742
2019-10-02	2019-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	26,512	-60	-0.23	7,638	8.77	1.3308
2019-07-03	2019-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	26,572	-360	-1.34	7,022	7.68	1.2259
2019-04-05	2019-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	26,932	790	3.02	6,521	22.46	1.1683
2019-01-08	2018-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	26,142	580	2.27	5,325	-11.31	1.0685
2018-10-03	2018-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	25,562	-75	-0.29	6,004	12.06	1.0148
2018-07-23	2018-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	25,637	-160	-0.62	5,358	10.22	0.9864
2018-04-19	2018-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	25,797	90	0.35	4,861	1.59	0.9191
2018-01-24	2017-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	25,707	-10	-0.04	4,785	13.25	0.8825
2017-10-06	2017-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	25,717	-175	-0.68	4,225	2.03	0.8054
2017-07-13	2017-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	25,892	135	0.52	4,141	-4.12	0.8117
2017-04-05	2017-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	25,757	1,255	5.12	4,319	10.09	0.8705
2017-01-05	2016-12-31	13F	Costco Wholesale	COMMON STOCK	22160K105	24,502	175	0.72	3,923	5.74	0.7953
2016-10-06	2016-09-30	13F	Costco Wholesale	COMMON STOCK	22160K105	24,327	310	1.29	3,710	-1.64	0.7592
2016-08-03	2016-06-30	13F	Costco Wholesale	COMMON STOCK	22160K105	24,017	1,900	8.59	3,772	8.24	0.7785
2016-05-10	2016-03-31	13F	Costco Wholesale	COMMON STOCK	22160K105	22,117	175	0.80	3,485	-1.66	0.7331
2016-01-11	2015-12-31	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	21,942	-410	-1.83	3,544	9.69	0.7792
2015-10-16	2015-09-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	22,352	-1,640	-6.84	3,231	-0.28	0.7355
2015-07-07	2015-06-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	23,992	500	2.13	3,240	-8.96	0.6106
2015-04-09	2015-03-31	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	23,492	500	2.17	3,559	9.21	0.6604
2015-02-13	2014-12-31	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	22,992	-150	-0.65	3,259	12.38	0.6054
2014-10-06	2014-09-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	23,142	-2,600	-10.10	2,900	-2.16	0.5579
2014-07-07	2014-06-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	25,742	-75	-0.29	2,964	2.81	0.5252
2014-04-07	2014-03-31	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	25,817	-1,295	-4.78	2,883	-10.66	0.5363
2014-01-13	2013-12-31	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	27,112	-800	-2.87	3,227	0.37	0.5862
2013-10-07	2013-09-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	27,912	-225	-0.80	3,215	3.34	0.6369
2013-07-09	2013-06-30	13F	COSTCO WHSL CORP	COMMON STOCK	22160K105	28,137	28,137		3,111		0.6358

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.