Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAspiriant, Llc
Latest Disclosed Ownership1,933 shares
Latest Disclosed Value $ 1,926,099
Aspiriant, Llc reports 12.89% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Aspiriant, Llc filed a 13F-HR form disclosing ownership of 1,933 shares of Costco Wholesale Corporation (MX:COST) valued at $1,926,099 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 2,219 shares of Costco Wholesale Corporation. This represents a change in shares of -12.89% 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)
2026-05-12 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 1,933 -286 -12.89 1,926 0.68 0.0549
2026-01-20 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,219 188 9.26 1,914 1.81 0.0550
2025-10-24 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,031 -180 -8.14 1,880 -14.12 0.0575
2025-07-29 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,211 80 3.75 2,189 8.59 0.0696
2025-04-21 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,131 117 5.81 2,015 9.21 0.0700
2025-01-16 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,014 32 1.61 1,845 5.01 0.0666
2024-10-17 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,982 -128 -6.07 1,757 -2.01 0.0667
2024-07-15 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,110 -217 -9.33 1,793 5.22 0.0731
2024-04-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,327 134 6.11 1,705 17.76 0.0706
2024-01-26 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,193 20 0.92 1,448 17.93 0.0652
2023-10-18 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,173 128 6.26 1,228 11.55 0.0628
2023-07-19 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 2,045 -48 -2.29 1,101 5.87 0.0556
2023-04-27 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 2,093 106 5.33 1,040 14.55 0.0544
2023-01-23 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,987 346 21.08 907 17.03 0.0462
2022-10-28 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,641 -2 -0.12 775 -1.52 0.0379
2022-07-25 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,643 -16 -0.96 787 -17.68 0.0380
2022-05-06 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,659 -25 -1.48 956 0.00 0.0526
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 1,684 665 65.26 956 108.73 0.0511
2021-10-27 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 1,019 -8 -0.78 458 12.25 0.0269
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 1,027 29 2.91 408 15.91 0.0231
2021-05-11 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 998 158 18.81 352 11.04 0.0225
2021-02-01 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 840 45 5.66 317 12.01 0.0216
2020-10-29 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 795 8 1.02 283 18.91 0.0221
2020-08-06 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 787 -150 -16.01 238 -10.86 0.0221
2020-05-05 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 937 -12 -1.26 267 -3.96 0.0263
2020-01-27 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 949 17 1.82 278 3.35 0.0257
2019-11-04 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 932 -241 -20.55 269 -13.23 0.0241
2019-08-06 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 1,173 -67 -5.40 310 2.99 0.0259
2019-08-06 2019-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,240 -236 -15.99 301 0.00 0.0246
2019-05-03 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 1,240 -236 301
2019-02-04 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 1,476 5 0.34 301 -13.01 0.0228
2018-10-26 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 1,471 100 7.29 346 20.56 0.0296
2018-08-07 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,371 -168 -10.92 287 -1.03 0.0246
2018-05-04 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,539 1,539 12.25 290 1.05 0.0253
2018-01-31 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -2,045 -100.00 0 -100.00
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 2,045 -7,663 -78.93 336 -78.36 0.0282
2017-08-03 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 9,708 302 3.21 1,553 -1.52 0.1351
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 9,406 37 0.39 1,577 5.13 0.1343
2017-02-10 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 9,369 38 0.41 1,500 5.41 0.1358
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 9,331 190 2.08 1,423 13.75 0.1416
2016-08-09 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 9,141 366 4.17 1,251 -9.54 0.1182
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 8,775 8,775 1,383 0.1320
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.