Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionM&t Bank Corp
Latest Disclosed Ownership193,664 shares
Latest Disclosed Value $ 192,972,620
M&t Bank Corp reports 2.57% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 193,664 shares of Costco Wholesale Corporation (MX:COST) valued at $192,972,620 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 198,776 shares of Costco Wholesale Corporation. This represents a change in shares of -2.57% 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)
2026-05-12 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 193,664 -5,112 -2.57 192,973 12.58 0.1565
2026-01-30 2025-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 198,776 4,031 2.07 171,412 -4.91 0.5503
2026-01-28 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 78,189 -116,556 7,106 0.0042
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 194,745 -9,201 -4.51 180,263 -10.71 0.6061
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 203,946 -3,102 -1.50 201,894 3.10 0.6937
2025-04-30 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 207,048 -15,896 -7.13 195,821 -4.14 0.7134
2025-02-06 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 222,944 -3,689 -1.63 204,277 1.67 0.6846
2024-11-19 2024-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 226,633 -2,852 -1.24 200,915 3.00 0.6606
2024-11-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 226,633 -2,852 200,915 0.1208
2024-07-31 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 229,485 -12,781 -5.28 195,061 9.90 0.6657
2024-05-07 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 242,266 -18,091 -6.95 177,492 3.28 0.6176
2024-02-06 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 260,357 -4,811 -1.81 171,856 14.72 0.6313
2023-11-02 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 265,168 -7,145 -2.62 149,809 2.18 0.5977
2023-08-09 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 272,313 -2,508 -0.91 146,608 7.37 0.5473
2023-05-11 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 274,821 -7,860 -2.78 136,550 5.82 0.5287
2023-02-13 2022-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 282,681 9,778 3.58 129,044 0.12 0.5191
2023-02-13 2022-12-31 13F CORVEL COM 22160K105 284,072 11,169 129,231 0.5198
2022-11-17 2022-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 272,903 4,498 1.68 128,885 27.67 0.5725
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 272,903 4,498 123,718 0.1055
2022-08-05 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 268,405 68,268 34.11 100,953 -12.40 0.4755
2022-05-09 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 200,137 12,358 6.58 115,248 8.11 0.5090
2022-02-07 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 187,779 -706 -0.37 106,601 25.86 0.4479
2021-10-28 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 188,485 -2,766 -1.45 84,697 11.93 0.3813
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 191,251 -2,983 -1.54 75,671 10.53 0.3323
2021-05-06 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 194,234 -11,000 -5.36 68,464 -11.46 0.2955
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 205,234 1,874 0.92 77,329 7.11 0.3392
2020-11-06 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 203,360 1,189 0.59 72,193 17.77 0.3544
2020-07-29 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 202,171 -2,833 -1.38 61,300 4.87 0.3285
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 205,004 6,019 3.02 58,453 -0.06 0.3457
2020-02-07 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 198,985 -344 -0.17 58,486 1.84 0.2747
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 199,329 -4,585 -2.25 57,429 6.57 0.2865
2019-08-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 203,914 9,074 4.66 53,886 14.22 0.2815
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 194,840 -14,209 -6.80 47,179 10.79 0.2467
2019-02-01 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 209,049 -4,915 -2.30 42,586 -15.26 0.2445
2018-11-09 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 213,964 -5,026 -2.30 50,256 9.81 0.2514
2018-08-10 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 218,990 1,082 0.50 45,766 11.46 0.2463
2018-05-04 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 217,908 2,645 1.23 41,061 2.48 0.2206
2018-02-06 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 215,263 4,099 1.94 40,066 15.49 0.2100
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 211,164 2,184 1.05 34,691 3.79 0.1882
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 208,980 3,697 1.80 33,423 -2.90 0.1973
2017-05-10 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 205,283 23,384 12.86 34,422 18.20 0.2078
2017-02-14 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 181,899 105,682 138.66 29,123 150.54 0.1814
2016-11-04 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 76,217 -7,953 -9.45 11,624 -12.05 0.0741
2016-08-04 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 84,170 -2,516 -2.90 13,217 -3.25 0.0889
2016-05-11 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 86,686 -5 -0.01 13,661 -2.44 0.0925
2016-02-12 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 86,691 -3,354 -3.72 14,002 7.56 0.0929
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 90,045 -23,265 -20.53 13,018 -14.94 0.0887
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 113,310 -45,250 -28.54 15,304 -36.29 0.0923
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 158,560 20,160 14.57 24,021 22.45 0.1498
2015-02-12 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 138,400 19,718 16.61 19,617 31.89 0.1228
2014-11-14 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 118,682 109,465 1,187.64 14,874 1,300.56 0.1042
2014-08-13 2014-06-30 13F COSTCO WHOLESALE CORP COM COMMON 22160K105 9,217 -1,243 -11.88 1,062 -9.08 0.0444
2014-05-14 2014-03-31 13F COSTCO WHOLESALE CORP COM COMMON STOCK 22160K105 10,460 -644 -5.80 1,168 -11.65 0.0485
2014-02-12 2013-12-31 13F COSTCO WHOLESALE CORP COM COMMON STOCK 22160K105 11,104 563 5.34 1,322 8.90 0.0554
2013-11-13 2013-09-30 13F COSTCO WHOLESALE CORP COM COMMON STOCK 22160K105 10,541 389 3.83 1,214 8.20 0.0579
2013-07-30 2013-06-30 13F COSTCO WHOLESALE CORP COM COMMON STOCK 22160K105 10,152 10,152 1,122 0.0544
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.