Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionSummit Trail Advisors, Llc
Latest Disclosed Ownership19,686 shares
Latest Disclosed Value $ 19,615,602
Summit Trail Advisors, Llc reports 25.03% increase in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Summit Trail Advisors, Llc filed a 13F-HR form disclosing ownership of 19,686 shares of Costco Wholesale Corporation (MX:COST) valued at $19,615,602 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 15,745 shares of Costco Wholesale Corporation. This represents a change in shares of 25.03% 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 19,686 3,941 25.03 19,616 44.47 0.2810
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 15,745 -1,712 -9.81 13,577 -15.98 0.2347
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 17,457 1,470 9.19 16,159 2.10 0.2231
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 15,987 2,278 16.62 15,827 22.06 0.2716
2025-04-28 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 13,709 4,339 46.31 12,966 51.03 0.4277
2025-01-29 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 9,370 2,797 42.55 8,586 47.36 0.3168
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 6,573 208 3.27 5,827 7.71 0.1445
2024-08-13 2024-06-30 13F Costco Wholesale Corp New Com COM 22160K105 6,365 66 1.05 5,410 17.20 0.1422
2024-04-23 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 6,299 277 4.60 4,615 13.53 0.1227
2024-02-06 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 6,022 -242 -3.86 4,065 14.86 0.1345
2023-10-30 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 6,264 552 9.66 3,539 15.09 0.1302
2023-07-25 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 5,712 1,592 38.64 3,075 50.22 0.1160
2023-05-04 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 4,120 364 9.69 2,047 19.43 0.0825
2023-02-07 2022-12-31 13F Costco Wholesale Corp New Com COM 22160K105 3,756 -48 -1.26 1,715 -4.62 0.0762
2022-11-10 2022-09-30 13F Costco Wholesale Corp New Com Stock 22160K105 3,804 -71 -1.83 1,797 -3.23 0.0972
2022-08-09 2022-06-30 13F Costco Wholesale Corp New Com COM 22160K105 3,875 2,967 326.76 1,857 255.07 0.1148
2022-05-16 2022-03-31 13F Costco Wholesale Corp New Com EQUITY 22160K105 908 257 39.48 523 41.35 0.0423
2022-02-11 2021-12-31 13F Costco Wholesale Corp New Com Equity 22160K105 651 157 31.78 370 66.67 0.0239
2021-11-16 2021-09-30 13F Costco Wholesale Corp New Com COM 22160K105 494 494 222 0.0167
2021-02-16 2020-12-31 13F Global PMTS Inc Com Equity 22160K105 0 -910 -100.00 0 -100.00
2020-11-16 2020-09-30 13F/A-1 Costco Wholesale Corp New Com Equity 22160K105 910 910 342 0.0661
2020-11-16 2020-09-30 13F Global PMTS Inc Com Equity 22160K105 2,291 423
2019-02-13 2018-12-31 13F COSTCO WHSL CORP NEW COM EQUITY 22160K105 0 -1,459 -100.00 0 -100.00
2018-11-14 2018-09-30 13F COSTCO WHSL CORP NEW COM EQUITY 22160K105 1,459 1,235 551.34 343 629.79 0.0757
2018-08-10 2018-06-30 13F Costco Wholesale Corp New Com EQUITY 22160K105 224 -2,197 -90.75 47 -87.40 0.0164
2018-05-22 2018-03-31 13F/A-1 COSTCO WHSL CORP NEW COM EQUITY 22160K105 2,421 108 4.67 373 -15.99 0.0633
2018-05-21 2018-03-31 13F COSTCO WHSL CORP NEW COM EQUITY 22160K105 373,013 370,700 373
2018-02-14 2017-12-31 13F COSTCO WHOLESALE EQUITY 22160K105 2,313 2,313 444 0.0561
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.