Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionLyell Wealth Management, Lp
Latest Disclosed Ownership29,874 shares
Latest Disclosed Value $ 29,767,424
Lyell Wealth Management, Lp reports 1.28% increase in ownership of COST / Costco Wholesale Corporation

On May 7, 2026 - Lyell Wealth Management, Lp filed a 13F-HR form disclosing ownership of 29,874 shares of Costco Wholesale Corporation (MX:COST) valued at $29,767,424 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 29,496 shares of Costco Wholesale Corporation. This represents a change in shares of 1.28% 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)
2026-05-07 2026-03-31 13F COSTCO WHOLESALE CORPORATION COM Stock 22160K105 29,874 378 1.28 29,767 17.03 2.1875
2026-02-11 2025-12-31 13F COSTCO WHOLESALE CORPORATION COM Stock 22160K105 29,496 563 1.95 25,436 -5.03 1.8418
2025-11-06 2025-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 28,933 592 2.09 26,781 -4.54 1.9892
2025-07-29 2025-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 28,341 859 3.13 28,056 7.94 2.2160
2025-05-08 2025-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 27,482 303 1.11 25,992 4.37 2.4296
2025-02-03 2024-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 27,179 147 0.54 24,903 3.92 2.2323
2024-10-23 2024-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 27,032 -72 -0.27 23,965 4.02 2.1790
2024-08-08 2024-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 27,104 548 2.06 23,038 18.42 2.1997
2024-05-03 2024-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,556 -139 -0.52 19,456 10.41 1.9782
2024-02-02 2023-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,695 249 0.94 17,621 17.93 2.0033
2023-10-31 2023-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,446 -264 -0.99 14,941 3.90 2.0094
2023-08-04 2023-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,710 1,077 4.20 14,380 12.91 1.8379
2023-05-03 2023-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,633 -908 -3.42 12,736 5.13 1.7829
2023-01-24 2022-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,541 249 0.95 12,116 -2.43 1.9135
2022-10-24 2022-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,292 542 2.10 12,417 0.62 2.1142
2022-07-28 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 25,750 -545 -2.07 12,341 -18.50 2.0126
2022-05-04 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 26,295 -3,164 -10.74 15,142 -9.46 1.9488
2022-02-08 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 29,459 338 1.16 16,724 27.80 1.9089
2021-11-10 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 29,121 -366 -1.24 13,086 12.16 1.5915
2021-08-09 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 29,487 729 2.53 11,667 15.09 1.4441
2021-05-07 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 28,758 2,329 8.81 10,137 1.80 1.4767
2021-02-04 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 26,429 1,490 5.97 9,958 12.48 1.5904
2020-11-04 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 24,939 219 0.89 8,853 18.12 1.6586
2020-07-30 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 24,720 1,382 5.92 7,495 12.64 1.6442
2020-05-11 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 23,338 1,030 4.62 6,654 1.48 1.9892
2020-02-05 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 22,308 181 0.82 6,557 2.85 1.7508
2019-11-06 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 22,127 72 0.33 6,375 9.39 1.9159
2019-08-01 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 22,055 665 3.11 5,828 12.53 1.7569
2019-05-06 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 21,390 1,035 5.08 5,179 24.89 1.7289
2019-02-09 2018-12-31 13F Costco Wholesale COM 22160K105 20,355 -152 -0.74 4,147 -13.91 1.7315
2018-10-30 2018-09-30 13F Costco Wholesale COM 22160K105 20,507 -558 -2.65 4,817 9.43 1.6219
2018-07-27 2018-06-30 13F Costco Wholesale COM 22160K105 21,065 55 0.26 4,402 11.19 1.6089
2018-05-04 2018-03-31 13F Costco Wholesale COM 22160K105 21,010 1,203 6.07 3,959 7.41 1.4647
2018-01-30 2017-12-31 13F Costco Wholesale COM 22160K105 19,807 -135 -0.68 3,686 12.52 1.4639
2017-10-26 2017-09-30 13F Costco Wholesale COM 22160K105 19,942 1,440 7.78 3,276 10.71 1.4147
2017-07-27 2017-06-30 13F Costco Wholesale COM 22160K105 18,502 2,095 12.77 2,959 7.56 1.4400
2017-05-08 2017-03-31 13F Costco Wholesale Equity 22160K105 16,407 -519 -3.07 2,751 1.51 1.4885
2017-02-13 2016-12-31 13F Costco Wholesale Common New 22160K105 16,926 16,926 2,710 1.6837
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.