Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionEP Wealth Advisors, Inc.
Latest Disclosed Ownership148,308 shares
Latest Disclosed Value $ 147,778,978
EP Wealth Advisors, Inc. reports 0.99% decrease in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - EP Wealth Advisors, Inc. filed a 13F-HR form disclosing ownership of 148,308 shares of Costco Wholesale Corporation (MX:COST) valued at $147,778,978 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 149,784 shares of Costco Wholesale Corporation. This represents a change in shares of -0.99% 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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 148,308 -1,476 -0.99 147,779 14.41 0.7259
2026-02-18 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 149,784 3,767 2.58 129,165 -10.64 0.6711
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 146,017 6,379 4.57 144,548 9.45 0.9500
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 139,638 3,096 2.27 132,066 5.56 1.0550
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 136,542 -2,881 -2.07 125,109 1.22 1.0210
2024-11-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 139,423 9,752 7.52 123,601 12.14 1.0623
2024-08-19 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 129,671 -22,217 -14.63 110,219 -0.95 1.1710
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 151,888 367 0.24 111,278 11.26 1.3007
2024-02-28 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 151,521 2,215 1.48 100,016 18.57 1.2757
2023-11-24 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 149,306 128,652 622.89 84,352 6.42 1.3084
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 20,654 104 0.51 79,264 3,789.25 1.1426
2023-06-05 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 20,550 -112,264 -84.53 2,039 -96.64 0.0351
2023-06-12 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 132,814 1,448 1.10 60,629 -2.27 1.0926
2022-12-02 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 131,366 8,745 7.13 62,040 5.56 1.4070
2022-08-11 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 122,621 6,262 5.38 58,770 -12.29 1.3236
2022-05-20 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 116,359 739 0.64 67,005 2.08 1.4710
2022-02-17 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 115,620 -1,131 -0.97 65,638 25.12 1.5514
2021-11-23 2021-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 116,751 3,355 2.96 52,462 16.93 1.4386
2021-11-16 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,160 -111,236 52,462 1.4386
2021-08-24 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 113,396 8,255 7.85 44,867 21.07 1.2439
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 105,141 12,221 13.15 37,060 5.86 1.1782
2021-02-18 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 92,920 4,224 4.76 35,010 11.19 1.2309
2020-11-17 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 88,696 2,044 2.36 31,487 19.84 1.3548
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 86,652 374 0.43 26,274 6.80 1.1219
2020-05-18 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 86,278 -60 -0.07 24,600 -3.06 1.2039
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 86,338 1,926 2.28 25,377 4.35 1.0451
2019-11-18 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 84,412 -2,874 -3.29 24,320 5.44 1.2060
2019-08-27 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 87,286 -2,687 -2.99 23,066 5.88 1.4410
2019-05-20 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 89,973 -150 -0.17 21,786 18.67 2.0948
2019-02-15 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 90,123 6,861 8.24 18,359 -6.12 1.4161
2018-11-15 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 83,262 -2,448 -2.86 19,556 9.18 1.5280
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 85,710 1,354 1.61 17,912 12.69 1.6901
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 84,356 2,844 3.49 15,895 4.77 1.5363
2018-02-15 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 81,512 3,691 4.74 15,171 18.66 1.6007
2017-11-15 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 77,821 7,399 10.51 12,785 13.51 1.4766
2017-08-17 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 70,422 3,477 5.19 11,263 0.33 1.3805
2017-05-15 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 66,945 2,790 4.35 11,226 23.32 1.5484
2017-02-15 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 64,155 3,106 5.09 9,103 -2.23 1.3304
2016-11-14 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 61,049 808 1.34 9,311 -1.58 1.4550
2016-08-15 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 60,241 -4,455 -6.89 9,460 -7.21 1.5075
2016-05-16 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 64,696 -16,285 -20.11 10,195 -22.04 1.5634
2016-02-16 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 80,981 -3,022 -3.60 13,078 7.69 2.1983
2015-11-17 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 84,003 -237 -0.28 12,144 6.74 2.3149
2015-08-14 2015-06-30 13F Costco Wholesale Common 22160K105 84,240 3,417 4.23 11,377 -7.08 2.1322
2015-05-15 2015-03-31 13F Costco Wholesale Common 22160K105 80,823 -1,486 -1.81 12,244 4.95 2.3024
2015-02-17 2014-12-31 13F Costco Wholesale Common 22160K105 82,309 -2,438 -2.88 11,667 9.85 1.9227
2014-11-12 2014-09-30 13F Costco Wholesale Common 22160K105 84,747 3,907 4.83 10,621 14.08 1.7200
2014-07-25 2014-06-30 13F Costco Wholesale Common 22160K105 80,840 5,836 7.78 9,310 11.15 2.1635
2014-05-15 2014-03-31 13F CostcoWholesale Common 22160K105 75,004 7,955 11.86 8,376 4.96 2.2909
2014-02-14 2013-12-31 13F Costco Wholesale Common 22160K105 67,049 3,082 4.82 7,980 8.32 2.0697
2013-11-14 2013-09-30 13F Costco Wholesale Common 22160K105 63,967 2,019 3.26 7,367 7.55 2.3147
2013-08-14 2013-06-30 13F Costco Wholesale Common 22160K105 61,948 61,948 6,850 2.4714
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.