Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionHaverford Trust Co
Latest Disclosed Ownership290,156 shares
Latest Disclosed Value $ 289,119,678
Haverford Trust Co reports 0.60% decrease in ownership of COST / Costco Wholesale Corporation

On May 11, 2026 - Haverford Trust Co filed a 13F-HR form disclosing ownership of 290,156 shares of Costco Wholesale Corporation (MX:COST) valued at $289,119,678 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 291,906 shares of Costco Wholesale Corporation. This represents a change in shares of -0.60% 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)
2026-05-11 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 290,156 -1,750 -0.60 289,120 14.86 2.6492
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 291,906 -1,998 -0.68 251,723 -7.47 2.2446
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 293,904 -3,745 -1.26 272,047 -7.67 2.4542
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 297,649 -2,762 -0.92 294,655 3.71 2.7995
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 300,411 -3,687 -1.21 284,123 1.97 2.8596
2025-02-11 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 304,098 -1,097 -0.36 278,636 2.98 2.7664
2024-11-05 2024-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 305,195 489 0.16 270,562 4.46 2.6363
2024-08-13 2024-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 304,706 -5,533 -1.78 258,997 13.95 2.7263
2024-05-02 2024-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 310,239 -33,506 -9.75 227,291 0.17 2.3748
2024-02-08 2023-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 343,745 -3,105 -0.90 226,899 15.79 2.5171
2023-11-09 2023-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 346,850 -3,614 -1.03 195,956 3.86 2.3880
2023-08-08 2023-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 350,464 4,390 1.27 188,683 9.73 2.1292
2023-05-12 2023-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 346,074 4,313 1.26 171,954 10.22 2.0538
2023-02-13 2022-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 341,761 2,567 0.76 156,014 -2.61 1.9210
2022-11-14 2022-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 339,194 3,275 0.97 160,191 -0.50 2.1945
2022-08-12 2022-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 335,919 80,220 31.37 160,999 9.34 2.0983
2022-05-05 2022-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 255,699 267 0.10 147,244 1.54 1.7008
2022-02-14 2021-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 255,432 -1,284 -0.50 145,009 25.71 1.5798
2021-11-12 2021-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 256,716 -110 -0.04 115,355 13.52 1.3796
2021-08-16 2021-06-30 13F/A-1 COSTCO WHSL CORP NEW COM COM 22160K105 256,826 6,634 2.65 101,618 15.23 1.1959
2021-08-16 2021-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 101,618 -148,574 101,618 1.1959
2021-05-12 2021-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 250,192 9,066 3.76 88,188 -2.93 1.1286
2021-02-05 2020-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 241,126 2,827 1.19 90,851 7.39 1.2833
2020-11-10 2020-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 238,299 5,352 2.30 84,596 19.77 1.3490
2020-08-13 2020-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 232,947 227,760 4,390.98 70,632 4,675.66 1.2115
2020-05-11 2020-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 5,187 -40 -0.77 1,479 -3.71 0.0300
2020-02-10 2019-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 5,227 449 9.40 1,536 11.55 0.0249
2019-11-04 2019-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,778 -194 -3.90 1,377 4.79 0.0242
2019-08-13 2019-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,972 -30 -0.60 1,314 8.51 0.0236
2019-05-09 2019-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 5,002 828 19.84 1,211 42.47 0.0225
2019-02-12 2018-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,174 -259 -5.84 850 -18.35 0.0181
2018-11-08 2018-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,433 57 1.30 1,041 13.89 0.0192
2018-08-10 2018-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,376 -55 -1.24 914 9.46 0.0181
2018-05-09 2018-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,431 -186 -4.03 835 -2.79 0.0167
2018-02-13 2017-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,617 1,470 46.71 859 66.15 0.0169
2017-11-09 2017-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 3,147 37 1.19 517 4.02 0.0108
2017-08-14 2017-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 3,110 489 18.66 497 12.95 0.0108
2017-05-05 2017-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,621 325 14.16 440 19.57 0.0100
2017-02-10 2016-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,296 37 1.64 368 6.67 0.0089
2016-11-14 2016-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,259 -50 -2.17 345 -4.96 0.0086
2016-08-04 2016-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,309 -101 -4.19 363 -4.47 0.0091
2016-05-10 2016-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,410 -37 -1.51 380 -3.80 0.0099
2016-02-09 2015-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,447 24 0.99 395 12.86 0.0106
2015-11-10 2015-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,423 -262 -9.76 350 -3.58 0.0102
2015-07-30 2015-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,685 0 0.00 363 -10.81 0.0100
2015-05-05 2015-03-31 13F/A-1 COSTCO WHSL CORP NEW COM COM 22160K105 2,685 -352 -11.59 407 -5.35 0.0113
2015-05-04 2015-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 45,649 407
2015-02-09 2014-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 3,037 77 2.60 430 15.90 0.0120
2014-11-05 2014-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,960 608 25.85 371 36.90 0.0111
2014-08-01 2014-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,352 2 0.09 271 3.44 0.0080
2014-05-08 2014-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,350 -4,005 -63.02 262 -65.34 0.0081
2014-01-31 2013-12-31 13F COSTCO WHSL CORP NEW COM Common Stocks 22160K105 6,355 180 2.91 756 6.18 0.0212
2013-11-01 2013-09-30 13F COSTCO WHSL CORP NEW COM Common Stocks 22160K105 6,175 50 0.82 712 5.17 0.0259
2013-07-31 2013-06-30 13F COSTCO WHSL CORP NEW COM Common Stocks 22160K105 6,125 6,125 677 0.0223
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.