Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionBirinyi Associates Inc
Latest Disclosed Ownership1,150 shares
Latest Disclosed Value $ 1,146
Birinyi Associates Inc ownership in COST / Costco Wholesale Corporation

On May 4, 2026 - Birinyi Associates Inc filed a 13F-HR form disclosing ownership of 1,150 shares of Costco Wholesale Corporation (MX:COST) valued at $1,146 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,150 shares of Costco Wholesale Corporation.

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)
2026-05-04 2026-03-31 13F Costco Wholesale Common Stock 22160K105 1,150 0 0.00 1 0.3121
2026-02-10 2025-12-31 13F Costco Wholesale Common Stock 22160K105 1,150 -1,991 -63.39 1 -100.00 0.2481
2025-10-29 2025-09-30 13F Costco Wholesale Common Stock 22160K105 3,141 -40 -1.26 3 -33.33 0.7423
2025-07-23 2025-06-30 13F Costco Wholesale Common Stock 22160K105 3,181 1,906 149.49 3 200.00 0.9208
2025-05-05 2025-03-31 13F Costco Wholesale Common Stock 22160K105 1,275 -3,500 -73.30 1 -99.98 0.3896
2025-02-04 2024-12-31 13F Costco Wholesale Common Stock 22160K105 4,775 -90 -1.85 4,375 109,275.00 1.2042
2024-11-14 2024-09-30 13F Costco Wholesale Common Stock 22160K105 4,865 3,590 281.57 4 -99.63 1.2382
2024-08-01 2024-06-30 13F Costco Wholesale Common Stock 22160K105 1,275 -2,940 -69.75 1,084 -64.93 0.3245
2024-04-23 2024-03-31 13F Costco Wholesale Common Stock 22160K105 4,215 75 1.81 3,088 154,300.00 1.0072
2024-01-10 2023-12-31 13F Costco Wholesale Common Stock 22160K105 4,140 4,140 3 0.9712
2023-11-14 2023-09-30 13F Costco Wholesale Common Stock 22160K105 0 -1,375 -100.00 0 0.0000
2023-08-08 2023-06-30 13F Costco Wholesale Common Stock 22160K105 1,375 0 0.00 1 0.2702
2023-05-10 2023-03-31 13F Costco Wholesale Common Stock 22160K105 1,375 -800 -36.78 1 0.2823
2023-02-08 2022-12-31 13F Costco Wholesale Common Stock 22160K105 2,175 675 45.00 1 -100.00 0.4769
2022-11-08 2022-09-30 13F Costco Wholesale Common Stock 22160K105 1,500 0 0.00 708 -1.53 0.3302
2022-08-02 2022-06-30 13F Costco Wholesale Common Stock 22160K105 1,500 -550 -26.83 719 -39.07 0.3252
2022-04-05 2022-03-31 13F Costco Wholesale Common Stock 22160K105 2,050 -200 -8.89 1,180 -7.60 0.4067
2022-01-26 2021-12-31 13F Costco Wholesale Common Stock 22160K105 2,250 300 15.38 1,277 45.78 0.4001
2021-10-18 2021-09-30 13F Costco Wholesale Common Stock 22160K105 1,950 0 0.00 876 13.47 0.3606
2021-08-05 2021-06-30 13F Costco Wholesale Common Stock 22160K105 1,950 -200 -9.30 772 1.85 0.2679
2021-05-11 2021-03-31 13F Costco Wholesale Common Stock 22160K105 2,150 -700 -24.56 758 -29.42 0.2888
2021-02-11 2020-12-31 13F Costco Wholesale Common Stock 22160K105 2,850 300 11.76 1,074 18.67 0.3974
2020-11-06 2020-09-30 13F Costco Wholesale Common Stock 22160K105 2,550 -700 -21.54 905 -8.12 0.3821
2020-08-06 2020-06-30 13F Costco Wholesale Common Stock 22160K105 3,250 1,000 44.44 985 53.43 0.4869
2020-05-12 2020-03-31 13F Costco Wholesale Common Stock 22160K105 2,250 -1,300 -36.62 642 -38.45 0.3498
2020-02-12 2019-12-31 13F Costco Wholesale Common Stock 22160K105 3,550 2,050 136.67 1,043 141.44 0.4318
2019-11-12 2019-09-30 13F Costco Wholesale Common Stock 22160K105 1,500 0 0.00 432 9.09 0.1874
2019-08-05 2019-06-30 13F Costco Wholesale Common Stock 22160K105 1,500 0 0.00 396 9.09 0.1663
2019-05-08 2019-03-31 13F Costco Wholesale Common Stock 22160K105 1,500 -300 -16.67 363 -1.09 0.1554
2019-02-07 2018-12-31 13F Costco Wholesale Common Stock 22160K105 1,800 300 20.00 367 4.26 0.1831
2018-11-01 2018-09-30 13F Costco Wholesale Common Stock 22160K105 1,500 0 0.00 352 12.46 0.1252
2018-08-10 2018-06-30 13F Costco Wholesale Common Stock 22160K105 1,500 0 0.00 313 10.60 0.1227
2018-04-26 2018-03-31 13F Costco Wholesale Common Stock 22160K105 1,500 -200 -11.76 283 -10.44 0.1152
2018-02-12 2017-12-31 13F Costco Wholesale Common Stock 22160K105 1,700 -1,750 -50.72 316 -44.27 0.1411
2017-11-14 2017-09-30 13F Costco Wholesale Common Stock 22160K105 3,450 -7,550 -68.64 567 -67.77 0.2697
2017-08-08 2017-06-30 13F Costco Wholesale Common Stock 22160K105 11,000 7,350 201.37 1,759 187.42 0.8276
2017-05-11 2017-03-31 13F Costco Wholesale Common Stock 22160K105 3,650 1,800 97.30 612 106.76 0.3044
2017-02-13 2016-12-31 13F Costco Wholesale Common Stock 22160K105 1,850 -10,500 -85.02 296 -84.28 0.1673
2016-11-10 2016-09-30 13F Costco Wholesale Common Stock 22160K105 12,350 2,050 19.90 1,883 16.38 1.0161
2016-08-10 2016-06-30 13F Costco Wholesale Common Stock 22160K105 10,300 0 0.00 1,618 -0.31 0.7067
2016-05-06 2016-03-31 13F COSTCO WHSL CORP Common Stock 22160K105 10,300 950 10.16 1,623 7.48 0.7185
2016-02-10 2015-12-31 13F COSTCO WHSL CORP Common Stock 22160K105 9,350 4,800 105.49 1,510 129.48 0.9824
2015-11-13 2015-09-30 13F COSTCO WHSL CORP Common Stock 22160K105 4,550 700 18.18 658 26.54 0.2853
2015-08-11 2015-06-30 13F COSTCO WHSL CORP Common Stock 22160K105 3,850 1,100 40.00 520 24.70 0.3540
2015-05-15 2015-03-31 13F COSTCO WHSL CORP Common Stock 22160K105 2,750 100 3.77 417 14.56 0.2759
2015-02-13 2014-12-31 13F COSTCO WHSL CORP Common Stock 22160K105 2,650 800 43.24 364 56.90 0.1630
2014-11-13 2014-09-30 13F COSTCO WHSL CORP Common Stock 22160K105 1,850 -1,396 -43.01 232 -36.09 0.1056
2014-08-13 2014-06-30 13F COSTCO WHSL CORP Common Stock 22160K105 3,246 0 0.00 363 0.00 0.1845
2014-05-14 2014-03-31 13F COSTCO WHSL CORP Common Stock 22160K105 3,246 -364 -10.08 363 -15.58 0.1845
2014-02-14 2013-12-31 13F COSTCO WHSL CORP Common Stock 22160K105 3,610 1,800 99.45 430 106.73 0.2294
2013-11-14 2013-09-30 13F COSTCO WHOLESALE Common Stock 22160K105 1,810 1,810 208 0.1173
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.