Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionMBL Wealth, LLC
Latest Disclosed Ownership2,569 shares
Latest Disclosed Value $ 2,559,829
MBL Wealth, LLC reports 13.17% increase in ownership of COST / Costco Wholesale Corporation

On April 28, 2026 - MBL Wealth, LLC filed a 13F-HR form disclosing ownership of 2,569 shares of Costco Wholesale Corporation (MX:COST) valued at $2,559,829 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 2,270 shares of Costco Wholesale Corporation. This represents a change in shares of 13.17% 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)
2026-04-28 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,569 299 13.17 2,560 30.76 0.1780
2026-01-21 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,270 258 12.82 1,958 5.10 0.1430
2025-10-16 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,012 469 30.40 1,862 21.94 0.1626
2025-07-22 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,543 -8 -0.52 1,528 4.16 0.1461
2025-05-21 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,551 161 11.58 1,467 15.16 0.1482
2025-04-21 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,390 -29 -2.04 1,274 1.19 0.1278
2025-01-08 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,419 -21 -1.46 1,258 2.78 0.1353
2024-07-19 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,440 -22 -1.50 1,224 14.29 0.1366
2024-04-22 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,462 3 0.21 1,071 11.21 0.1215
2024-01-18 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,459 32 2.24 963 19.48 0.1205
2023-10-11 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,427 140 10.88 806 16.47 0.1135
2023-07-17 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,287 -7 -0.54 693 7.79 0.0978
2023-04-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,294 163 14.41 643 0.1005
2023-01-12 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,131 -44 -3.74 1 -100.00 0.0987
2023-01-12 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,175 -1 -0.09 555 -1.60 0.1197
2023-01-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,176 1 0.09 564 -16.69 0.1406
2022-05-02 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,175 1,175 677 0.1652
2021-10-25 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 0 -1,057 -100.00 0 -100.00
2021-05-27 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,057 51 5.07 373 -1.84 0.1301
2021-02-16 2020-12-31 13F COSTCO WHOLESALE COM 22160K105 1,006 1,006 380 0.1505
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.