Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionPhiladelphia Trust Co
Latest Disclosed Ownership632 shares
Latest Disclosed Value $ 630
Philadelphia Trust Co ownership in COST / Costco Wholesale Corporation

On May 13, 2026 - Philadelphia Trust Co filed a 13F-HR form disclosing ownership of 632 shares of Costco Wholesale Corporation (MX:COST) valued at $630 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 632 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)
2026-05-13 2026-03-31 13F COSTCO WHSL CORP COM 22160K105 632 0 0.00 1 0.0445
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 632 10 1.61 1 0.0376
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 622 -100 -13.85 1 0.0405
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 722 100 16.08 1 0.0549
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 622 -352 -36.14 1 0.0503
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 974 -834 -46.13 1 -100.00 0.0654
2024-11-13 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,808 121 7.17 2 0.00 0.1163
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,687 -25 -1.46 1 0.00 0.1114
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,712 -41 -2.34 1 0.00 0.1007
2024-02-09 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,753 -260 -12.92 1 0.00 0.1086
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,013 -15 -0.74 1 0.00 0.1168
2023-08-07 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 2,028 -597 -22.74 1 0.00 0.1034
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 2,625 0 0.00 1 0.00 0.1328
2023-02-07 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 2,625 0 0.00 1 -99.92 0.1283
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,625 -3,606 -57.87 1,240 -58.47 0.1402
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 6,231 -13 -0.21 2,986 -16.96 0.3066
2022-05-05 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 6,244 126 2.06 3,596 3.54 0.2837
2022-02-09 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 6,118 -69 -1.12 3,473 24.93 0.2515
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 6,187 -173 -2.72 2,780 10.49 0.2049
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,360 -258 -3.90 2,516 7.84 0.1735
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 6,618 -834 -11.19 2,333 -16.92 0.1794
2021-02-08 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 7,452 -410 -5.21 2,808 0.61 0.2289
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 7,862 -47 -0.59 2,791 16.39 0.2691
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 7,909 5,594 241.64 2,398 263.33 0.2525
2020-05-12 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 2,315 -15 -0.64 660 -3.65 0.0832
2020-02-10 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 2,330 -77 -3.20 685 -1.15 0.0588
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 2,407 0 0.00 693 8.96 0.0643
2019-08-08 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 2,407 0 0.00 636 9.09 0.0560
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 2,407 32 1.35 583 20.45 0.0514
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 2,375 -675 -22.13 484 -32.40 0.0517
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 3,050 0 0.00 716 12.40 0.0588
2018-08-10 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 3,050 55 1.84 637 12.94 0.0570
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 2,995 325 12.17 564 13.48 0.0470
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 2,670 0 0.00 497 13.21 0.0391
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 2,670 475 21.64 439 25.07 0.0361
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 2,195 168 8.29 351 3.24 0.0298
2017-05-15 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 2,027 32 1.60 340 6.58 0.0279
2017-03-29 2016-12-31 13F/A-1 COSTCO WHOLESALE COM 22160K105 1,995 -139 -6.51 319 -1.85 0.0255
2017-02-10 2016-12-31 13F COSTCO WHOLESALE COM 22160K105 1,995 319
2016-11-14 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 2,134 2,134 0.00 325 0.0281
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -1,595 -100.00 0 -100.00
2016-02-09 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 1,595 -200 -11.14 257 -1.15 0.0215
2015-11-16 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 1,795 1,795 260 0.0235
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.