Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionLaffer Investments
Latest Disclosed Ownership5,369 shares
Latest Disclosed Value $ 5,349,833
Laffer Investments reports 8.49% increase in ownership of COST / Costco Wholesale Corporation

On May 13, 2026 - Laffer Investments filed a 13F-HR form disclosing ownership of 5,369 shares of Costco Wholesale Corporation (MX:COST) valued at $5,349,833 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,949 shares of Costco Wholesale Corporation. This represents a change in shares of 8.49% 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)
2026-05-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 5,369 420 8.49 5,350 25.36 0.7899
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 4,949 -505 -9.26 4,268 -15.47 0.6486
2025-11-12 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 5,454 -449 -7.61 5,048 -13.61 0.7994
2025-08-07 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 5,903 1,092 22.70 5,844 28.42 1.0414
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 4,811 -1,369 -22.15 4,550 -19.64 0.9688
2025-02-06 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 6,180 769 14.21 5,663 18.06 1.1134
2024-11-04 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 5,411 -99 -1.80 4,797 2.41 0.9714
2024-08-14 2024-06-30 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 5,510 1,733 45.88 4,683 69.24 1.0094
2024-05-15 2024-03-31 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 3,777 -328 -7.99 2,767 2.14 0.7144
2024-02-08 2023-12-31 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 4,105 370 9.91 2,710 28.39 0.7203
2023-11-14 2023-09-30 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 3,735 538 16.83 2,110 22.60 0.6205
2023-08-14 2023-06-30 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 3,197 52 1.65 1,721 10.18 0.4566
2023-05-09 2023-03-31 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 3,145 -222 -6.59 1,563 1.63 0.4233
2023-02-10 2022-12-31 13F COSTCO WHOLESALE COMMON STOCKS 22160K105 3,367 273 8.82 1,537 5.20 0.4424
2022-11-10 2022-09-30 13F costco wholesale COMMON STOCKS 22160K105 3,094 42 1.38 1,461 -0.07 0.5369
2022-08-15 2022-06-30 13F costco wholesale COMMON STOCKS 22160K105 3,052 344 12.70 1,463 -6.22 0.5136
2022-05-13 2022-03-31 13F costco wholesale COMMON STOCKS 22160K105 2,708 -2,311 -46.05 1,559 -45.28 0.4698
2022-02-11 2021-12-31 13F costco wholesale COMMON STOCKS 22160K105 5,019 372 8.01 2,849 36.45 0.8229
2021-11-16 2021-09-30 13F costco wholesale COMMON STOCKS 22160K105 4,647 3,031 187.56 2,088 226.76 0.6042
2021-08-16 2021-06-30 13F costco wholesale COMMON STOCKS 22160K105 1,616 -452 -21.86 639 -12.23 0.2396
2021-05-17 2021-03-31 13F Costco Whsl COMMON STOCKS 22160K105 2,068 1,392 205.92 729 187.75 0.2760
2021-06-11 2020-12-31 13F/A-1 Costco Whsl COMMON STOCKS 22160K105 676 0 0.00 253 5.86 0.1068
2021-06-11 2020-09-30 13F/A-1 Costco Whsl COMMON STOCKS 22160K105 676 676 240 0.1200
2020-11-13 2020-09-30 13F Costco Whsl COMMON STOCKS 22160K105 796 796 283 0.1379
2013-11-14 2013-09-30 13F Costco Whsl COMMON STOCKS 22160K105 0 -67,900 -100.00 0 -100.00
2013-08-15 2013-06-30 13F Costco Whsl COMMON STOCKS 22160K105 67,900 67,900 7,508 1.4708
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.