Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWbh Advisory Inc
Latest Disclosed Ownership4,742 shares
Latest Disclosed Value $ 4,725,348
Wbh Advisory Inc reports 4.41% decrease in ownership of COST / Costco Wholesale Corporation

On April 27, 2026 - Wbh Advisory Inc filed a 13F-HR form disclosing ownership of 4,742 shares of Costco Wholesale Corporation (MX:COST) valued at $4,725,348 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 4,961 shares of Costco Wholesale Corporation. This represents a change in shares of -4.41% 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 Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-27 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 4,742 -219 -4.41 4,725 10.45 0.3539
2026-01-26 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 4,961 -23 -0.46 4,278 -7.26 0.3168
2025-10-30 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 4,984 -21 -0.42 4,614 -6.88 0.3523
2025-07-30 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 5,005 -65 -1.28 4,955 3.32 0.4223
2025-05-12 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 5,070 -387 -7.09 4,795 -4.08 0.4474
2025-01-31 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 5,457 -19 -0.35 5,000 2.99 0.4640
2024-10-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 5,476 -226 -3.96 4,854 0.17 0.4597
2024-07-11 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 5,702 -184 -3.13 4,846 12.41 0.4905
2024-04-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 5,886 -198 -3.25 4,312 7.37 0.4437
2024-01-09 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 6,084 -133 -2.14 4,016 14.32 0.4467
2023-10-10 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 6,217 -88 -1.40 3,513 3.48 0.4311
2023-07-12 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,305 -38 -0.60 3,395 7.71 0.4022
2023-04-20 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 6,343 15 0.24 3,152 5.46 0.3935
2022-10-18 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 6,328 22 0.35 2,988 -5.02 0.4311
2022-07-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 6,306 -215 -3.30 3,146 -14.16 0.4198
2022-04-29 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 6,521 112 1.75 3,665 0.71 0.4499
2022-01-28 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 6,409 -395 -5.81 3,639 19.00 0.4151
2021-10-25 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 6,804 -142 -2.04 3,058 4.01 0.4114
2021-07-27 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,946 -299 -4.13 2,940 15.11 0.4308
2021-04-19 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 7,245 -241 -3.22 2,554 -5.58 0.4133
2021-01-21 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 7,486 -50 -0.66 2,705 1.12 0.4654
2020-10-27 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 7,536 -297 -3.79 2,675 12.63 0.5399
2020-08-05 2020-06-30 13F Costco COM 22160K105 7,833 -510 -6.11 2,375 -0.13 0.5748
2020-05-07 2020-03-31 13F Costco COM 22160K105 8,343 -33 -0.39 2,378 -3.41 0.5577
2020-01-27 2019-12-31 13F Costco COM 22160K105 8,376 -72 -0.85 2,462 1.15 0.5034
2019-10-25 2019-09-30 13F Costco COM 22160K105 8,448 -225 -2.59 2,434 6.20 0.5466
2019-08-02 2019-06-30 13F Costco COM 22160K105 8,673 -300 -3.34 2,292 5.52 0.5313
2019-04-22 2019-03-31 13F Costco COM 22160K105 8,973 -445 -4.72 2,172 13.24 0.5166
2019-01-29 2018-12-31 13F Costco COM 22160K105 9,418 -99 -1.04 1,918 -14.18 0.4656
2018-10-29 2018-09-30 13F Costco COM 22160K105 9,517 -421 -4.24 2,235 7.61 0.5418
2018-07-31 2018-06-30 13F Costco COM 22160K105 9,938 -217 -2.14 2,077 8.57 0.5384
2018-04-30 2018-03-31 13F Costco COM 22160K105 10,155 1 0.01 1,913 1.27 0.5201
2018-01-31 2017-12-31 13F Costco COM 22160K105 10,154 -487 -4.58 1,889 8.07 0.5038
2017-11-29 2017-09-30 13F Costco COM 22160K105 10,641 -150 -1.39 1,748 -89.87 0.4878
2017-07-21 2017-06-30 13F Costco COM 22160K105 10,791 151 1.42 17,258 867.38 4.8411
2017-04-21 2017-03-31 13F Costco COM 22160K105 10,640 -50 -0.47 1,784 4.27 0.5344
2017-01-20 2016-12-31 13F Costco COM 22160K105 10,690 -110 -1.02 1,711 3.89 0.5703
2016-10-24 2016-09-30 13F Costco COM 22160K105 10,800 -170 -1.55 1,647 -4.36 0.5636
2016-07-25 2016-06-30 13F Costco COM 22160K105 10,970 -85 -0.77 1,722 -1.15 0.6703
2016-04-15 2016-03-31 13F Costco COM 22160K105 11,055 -225 -1.99 1,742 -4.34 0.5830
2016-01-19 2015-12-31 13F Costco COM 22160K105 11,280 -500 -4.24 1,821 6.93 0.6364
2015-10-15 2015-09-30 13F Costco COM 22160K105 11,780 61 0.52 1,703 7.65 0.7075
2015-07-20 2015-06-30 13F Costco COM 22160K105 11,719 255 2.22 1,582 -8.87 0.6217
2015-04-22 2015-03-31 13F Costco COM 22160K105 11,464 -400 -3.37 1,736 3.27 0.4871
2015-01-23 2014-12-31 13F Costco COM 22160K105 11,864 -575 -4.62 1,681 7.89 0.6338
2014-10-17 2014-09-30 13F Costco COM 22160K105 12,439 295 2.43 1,558 11.44 0.5474
2014-07-21 2014-06-30 13F Costco COM 22160K105 12,144 545 4.70 1,398 7.95 0.5285
2014-04-29 2014-03-31 13F Costco COM 22160K105 11,599 3,771 48.17 1,295 39.10 0.5152
2014-02-19 2013-12-31 13F/A-1 Costco COM 22160K105 7,828 334 4.46 931 7.88 0.3750
2014-01-27 2013-12-31 13F Costco COM 22160K105 7,828 931
2013-11-05 2013-09-30 13F Costco COM 22160K105 7,494 -334 -4.27 863 -0.23 0.3863
2013-07-19 2013-06-30 13F Costco COM 22160K105 7,828 7,828 865 0.4001
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.