Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionHarbor Group, Inc.
Latest Disclosed Ownership539 shares
Latest Disclosed Value $ 536,626
Harbor Group, Inc. reports 0.19% increase in ownership of COST / Costco Wholesale Corporation

On April 10, 2026 - Harbor Group, Inc. filed a 13F-HR form disclosing ownership of 539 shares of Costco Wholesale Corporation (MX:COST) valued at $536,626 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 538 shares of Costco Wholesale Corporation. This represents a change in shares of 0.19% 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)
2026-04-10 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 539 1 0.19 537 15.52 0.0775
2026-01-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 538 175 48.21 464 38.10 0.0695
2025-10-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 363 0 0.00 336 -6.41 0.0534
2025-07-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 363 0 0.00 359 4.66 0.0637
2025-04-11 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 363 -50 -12.11 343 -9.26 0.0685
2025-01-15 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 413 0 0.00 378 3.28 0.0849
2024-10-09 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 413 0 0.00 366 4.27 0.0846
2024-07-12 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 413 -44 -9.63 351 5.09 0.0899
2024-04-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 457 22 5.06 335 16.38 0.0883
2024-01-10 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 435 -26 -5.64 287 10.38 0.0823
2023-10-11 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 461 0 0.00 261 4.84 0.1468
2023-07-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 461 -6 -1.28 248 6.90 0.1374
2023-04-11 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 467 467 232 0.1384
2022-07-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -395 -100.00 0 -100.00
2022-04-25 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 395 0 0.00 227 1.34 0.1434
2022-01-25 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 395 395 224 0.1334
2021-07-26 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -695 -100.00 0 -100.00
2021-04-23 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 695 60 9.45 258 10.73 0.1761
2021-01-21 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 635 635 233 0.1740
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.