Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAmi Asset Management Corp
Latest Disclosed Ownership22,407 shares
Latest Disclosed Value $ 22,326,828
Ami Asset Management Corp reports 2.82% decrease in ownership of COST / Costco Wholesale Corporation

On April 23, 2026 - Ami Asset Management Corp filed a 13F-HR form disclosing ownership of 22,407 shares of Costco Wholesale Corporation (MX:COST) valued at $22,326,828 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 23,058 shares of Costco Wholesale Corporation. This represents a change in shares of -2.82% 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)
2026-04-23 2026-03-31 13F COSTCO WHSL CORP COM 22160K105 22,407 -651 -2.82 22,327 12.28 1.4257
2026-01-23 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 23,058 -599 -2.53 19,884 -9.19 1.1274
2025-10-16 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 23,657 -243 -1.02 21,897 -7.45 1.2229
2025-07-18 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 23,900 -1,237 -4.92 23,660 -0.48 1.3523
2025-04-23 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 25,137 -1,161 -4.41 23,774 -1.33 1.3911
2025-01-17 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 26,298 -492 -1.84 24,096 1.46 1.2836
2024-10-25 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 26,790 -31,787 -54.27 23,750 -52.30 1.2865
2024-07-25 2024-06-30 13F COSTCO WHOLESALE COM 22160K105 58,577 -1,980 -3.27 49,790 12.22 2.6850
2024-04-19 2024-03-31 13F COSTCO WHOLESALE COM 22160K105 60,557 -24,466 -28.78 44,366 -20.95 2.2677
2024-01-19 2023-12-31 13F COSTCO WHOLESALE COM 22160K105 85,023 -484 -0.57 56,122 16.17 3.0684
2023-10-20 2023-09-30 13F COSTCO WHOLESALE COM 22160K105 85,507 -283 -0.33 48,308 4.59 2.9926
2023-07-25 2023-06-30 13F COSTCO WHOLESALE COM 22160K105 85,790 -776 -0.90 46,188 7.38 2.7495
2023-04-21 2023-03-31 13F/A-1 COSTCO WHOLESALE COM 22160K105 86,566 14,535 20.18 43,012 134,312.50 2.7454
2023-04-21 2023-03-31 13F COSTCO WHOLESALE COM 22160K105 86,566 14,535 43 2.7453
2023-01-17 2022-12-31 13F COSTCO WHOLESALE COM 22160K105 72,031 -278 -0.38 33 -99.91 2.3014
2022-10-24 2022-09-30 13F COSTCO WHOLESALE COM 22160K105 72,309 20,295 39.02 34,150 36.98 2.4971
2022-07-21 2022-06-30 13F COSTCO WHOLESALE COM 22160K105 52,014 -1,427 -2.67 24,930 -18.99 1.5814
2022-04-27 2022-03-31 13F COSTCO WHOLESALE COM 22160K105 53,441 -26,365 -33.04 30,774 -32.08 1.6075
2022-01-20 2021-12-31 13F COSTCO WHOLESALE COM 22160K105 79,806 -1,595 -1.96 45,306 23.86 2.1901
2021-10-22 2021-09-30 13F COSTCO WHOLESALE COM 22160K105 81,401 -3,039 -3.60 36,578 9.48 1.8303
2021-07-20 2021-06-30 13F COSTCO WHOLESALE COM 22160K105 84,440 -2,232 -2.58 33,411 9.36 1.6747
2021-04-16 2021-03-31 13F COSTCO WHOLESALE COM 22160K105 86,672 -6,318 -6.79 30,550 -12.81 1.5965
2021-01-20 2020-12-31 13F COSTCO WHOLESALE COM 22160K105 92,990 -2,035 -2.14 35,037 3.86 1.7380
2020-10-23 2020-09-30 13F COSTCO WHOLESALE COM 22160K105 95,025 -56,127 -37.13 33,734 -26.39 1.7149
2020-07-15 2020-06-30 13F COSTCO WHOLESALE COM 22160K105 151,152 -11,418 -7.02 45,831 -1.13 2.4442
2020-04-27 2020-03-31 13F COSTCO WHOLESALE COM 22160K105 162,570 -3,882 -2.33 46,354 -5.25 2.9271
2020-01-23 2019-12-31 13F COSTCO WHOLESALE COM 22160K105 166,452 -4,936 -2.88 48,924 -0.92 2.4158
2019-10-23 2019-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 171,388 -3,006 -1.72 49,379 7.15 2.5667
2019-08-05 2019-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 174,394 59,333 51.57 46,085 65.41 2.2851
2019-04-25 2019-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 115,061 -1,987 -1.70 27,861 16.85 2.0540
2019-01-25 2018-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 117,048 -2,445 -2.05 23,844 -15.05 1.9698
2018-10-22 2018-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 119,493 -38,930 -24.57 28,067 -15.22 1.9099
2018-07-23 2018-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 158,423 -5,868 -3.57 33,107 6.95 2.3692
2018-04-20 2018-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 164,291 53,274 47.99 30,957 49.83 2.2104
2018-01-16 2017-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 111,017 -4,361 -3.78 20,662 9.01 1.4259
2017-10-10 2017-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 115,378 -741 -0.64 18,955 2.07 1.3418
2017-07-14 2017-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 116,119 -5,164 -4.26 18,571 -8.69 1.3245
2017-04-13 2017-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 121,283 -26,800 -18.10 20,338 -14.22 1.5318
2017-01-24 2016-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 148,083 -12,508 -7.79 23,710 -3.19 1.7519
2016-10-18 2016-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 160,591 -52,647 -24.69 24,492 -26.86 1.6882
2016-07-20 2016-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 213,238 -7,213 -3.27 33,487 -3.60 2.3319
2016-04-19 2016-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 220,451 -450 -0.20 34,739 -2.63 2.3842
2016-01-26 2015-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 220,901 5,152 2.39 35,676 14.38 2.4777
2015-10-16 2015-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 215,749 15,462 7.72 31,191 15.30 2.3834
2015-07-16 2015-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 200,287 10,382 5.47 27,051 -5.97 2.0146
2015-04-14 2015-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 189,905 7,608 4.17 28,770 11.33 2.2373
2015-01-20 2014-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 182,297 5,659 3.20 25,841 16.74 2.2584
2014-10-16 2014-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 176,638 -1,642 -0.92 22,136 7.82 2.1708
2014-07-09 2014-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 178,280 -941 -0.53 20,531 2.58 2.0403
2014-04-16 2014-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 179,221 8,428 4.93 20,015 -1.54 2.0487
2014-01-22 2013-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 170,793 -1,020 -0.59 20,328 2.73 2.2353
2013-10-15 2013-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 171,813 2,793 1.65 19,788 5.88 2.8511
2013-07-22 2013-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 169,020 169,020 18,689 2.9199
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.