Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAldebaran Financial Inc.
Latest Disclosed Ownership360 shares
Latest Disclosed Value $ 358,715
Aldebaran Financial Inc. ownership in COST / Costco Wholesale Corporation

On May 14, 2026 - Aldebaran Financial Inc. filed a 13F-HR form disclosing ownership of 360 shares of Costco Wholesale Corporation (MX:COST) valued at $358,715 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 360 shares of Costco Wholesale Corporation. This represents a change in shares of 0.00% 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 360 0 0.00 359 15.11 0.3407
2026-01-23 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 360 10 2.86 312 -3.72 0.2884
2025-11-19 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 350 95 37.25 324 28.17 0.3241
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 255 0 0.00 252 4.56 0.2794
2025-05-08 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 255 0 0.00 241 2.55 0.2947
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 255 5 2.00 235 6.33 0.2748
2024-11-21 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 250 0 0.00 222 4.25 0.2613
2024-08-22 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 250 250 212 0.2785
2022-08-01 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -410 -100.00 0 -100.00
2022-04-18 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 410 0 0.00 236 1.29 0.1834
2022-02-16 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 410 410 233 0.1720
2021-10-21 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 0 -561 -100.00 0 -100.00
2021-07-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 561 561 222 0.1824
2021-05-03 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -561 -100.00 0 -100.00
2021-02-05 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 561 561 211 0.1963
2020-02-10 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -1,450 -100.00 0 -100.00
2019-10-21 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 1,450 0 0.00 412 7.57 0.2750
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 1,450 0 0.00 383 9.12 0.2646
2019-04-23 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 1,450 10 0.69 351 19.80 0.2468
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 1,440 0 0.00 293 -13.31 0.2230
2018-11-08 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 1,440 -50 -3.36 338 8.68 0.2194
2018-08-10 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,490 0 0.00 311 10.68 0.2135
2018-05-12 2018-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,490 0 0.00 281 1.44 0.1885
2018-04-24 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,490 0 281
2018-03-02 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,490 0 0.00 277 13.06 0.1841
2017-11-17 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 1,490 0 0.00 245 2.94 0.1690
2017-08-28 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 1,490 -300 -16.76 238 -20.67 0.1736
2017-06-16 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 300 4.53 0.2283
2017-03-23 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 287 5.13 0.2272
2016-12-16 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 273 -7.14 0.2164
2016-08-25 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 294 4.26 0.2363
2016-05-16 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 282 -1.40 0.2460
2016-02-17 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 1,790 300 20.13 286 33.02 0.2649
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 1,490 -300 -16.76 215 -11.16 0.2031
2015-08-17 2015-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,790 0 0.00 242 -10.70 0.2041
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 1,790 242
2015-06-02 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 1,790 -880 -32.96 271 -28.31 0.2325
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 2,670 -300 -10.10 378 1.61 0.3321
2014-11-14 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 2,970 0 0.00 372 -1.06 0.3326
2014-08-15 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 2,970 300 11.24 376 26.17 0.2960
2014-05-16 2014-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 2,670 -300 -10.10 298 -15.58 0.2603
2014-05-15 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 3,000 298
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 2,970 2,970 353 0.3356
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.