Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionColonial Trust Advisors
Latest Disclosed Ownership23,185 shares
Latest Disclosed Value $ 23,102,182
Colonial Trust Advisors reports 3.22% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Colonial Trust Advisors filed a 13F-HR form disclosing ownership of 23,185 shares of Costco Wholesale Corporation (MX:COST) valued at $23,102,182 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 23,957 shares of Costco Wholesale Corporation. This represents a change in shares of -3.22% 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 WHSL CORP NEW COM Stock 22160K105 23,185 -772 -3.22 23,102 11.83 1.7954
2026-02-12 2025-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 23,957 -623 -2.53 20,659 -9.20 1.5546
2025-11-10 2025-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 24,580 -494 -1.97 22,752 -8.34 1.7525
2025-08-13 2025-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,074 13 0.05 24,822 4.73 2.0510
2025-05-14 2025-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,061 44 0.18 23,702 3.40 2.1085
2025-02-13 2024-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,017 -190 -0.75 22,922 2.58 2.0316
2024-11-12 2024-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,207 -79 -0.31 22,347 3.97 1.9325
2024-08-14 2024-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,286 -622 -2.40 21,493 13.23 2.0579
2024-05-14 2024-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 25,908 -665 -2.50 18,981 8.22 1.8770
2024-02-14 2023-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 26,573 -728 -2.67 17,540 13.72 1.8610
2023-11-13 2023-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 27,301 -941 -3.33 15,424 1.45 1.7666
2023-08-14 2023-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 28,242 -892 -3.06 15,205 5.04 1.6899
2023-05-11 2023-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 29,134 -437 -1.48 14,476 7.23 1.7007
2023-02-14 2022-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 29,571 -86 -0.29 13,499 -3.62 1.6561
2022-11-14 2022-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 29,657 881 3.06 14,006 1.55 1.8971
2022-08-12 2022-06-30 13F COSTCO WHOLESALE CS 22160K105 28,776 -835 -2.82 13,792 -19.12 1.9392
2022-05-09 2022-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 29,611 -1,178 -3.83 17,052 -2.44 2.0183
2022-02-14 2021-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 30,789 -1,256 -3.92 17,479 21.39 1.9552
2021-11-12 2021-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,045 -338 -1.04 14,399 12.38 1.7760
2021-08-05 2021-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,383 -117 -0.36 12,813 11.85 1.5643
2021-05-10 2021-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,500 -230 -0.70 11,456 -7.10 1.5056
2021-01-29 2020-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,730 -32 -0.10 12,332 6.03 1.7111
2020-10-26 2020-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,762 -800 -2.38 11,631 14.30 1.8275
2020-08-10 2020-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 33,562 153 0.46 10,176 6.82 1.7360
2020-05-06 2020-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 33,409 1,202 3.73 9,526 0.63 1.9936
2020-02-14 2019-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,207 -502 -1.53 9,466 0.46 1.5711
2019-11-15 2019-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,709 27 0.08 9,423 9.11 1.6666
2019-08-21 2019-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,682 8 0.02 8,636 9.15 1.5630
2019-05-15 2019-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,674 3,589 12.34 7,912 33.54 1.5014
2019-02-11 2018-12-31 13F COSTCO WHOLESALE CS 22160K105 29,085 -2,205 -7.05 5,925 -19.38 1.4472
2018-11-14 2018-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 31,290 -715 -2.23 7,349 9.88 1.3743
2018-08-14 2018-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 32,005 200 0.63 6,688 11.60 1.3253
2018-05-09 2018-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 31,805 -9,212 -22.46 5,993 -21.50 1.2218
2018-02-21 2017-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 41,017 9,839 31.56 7,634 49.04 1.1832
2017-11-14 2017-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 31,178 6 0.02 5,122 2.75 1.1252
2017-08-14 2017-06-30 13F COSTCO WHOLESALE CS 22160K105 31,172 8,295 36.26 4,985 27.23 1.1317
2017-05-15 2017-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,877 175 0.77 3,918 7.79 1.2054
2017-02-13 2016-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,702 35 0.15 3,635 5.15 1.1734
2016-10-18 2016-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,667 111 0.49 3,457 -2.40 1.0859
2016-08-22 2016-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,556 -275 -1.20 3,542 -1.56 1.1332
2016-05-13 2016-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,831 210 0.93 3,598 -1.51 1.1741
2016-02-12 2015-12-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,621 -350 -1.52 3,653 10.00 1.2147
2015-11-18 2015-09-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 22,971 -100 -0.43 3,321 6.58 1.1153
2015-08-05 2015-06-30 13F COSTCO WHOLESALE CRP DEL CS 22160K105 23,071 -95 -0.41 3,116 -11.23 0.9658
2015-06-01 2015-03-31 13F COSTCO WHOLESALE CRP DEL CS 22160K105 23,166 6,348 37.75 3,510 47.23 1.0724
2015-02-13 2014-12-31 13F COSTCO WHOLESALE CS 22160K105 16,818 -4,325 -20.46 2,384 -10.04 0.9220
2014-11-14 2014-09-30 13F COSTCO WHOLESALE CS 22160K105 21,143 -560 -2.58 2,650 6.04 0.8208
2014-08-14 2014-06-30 13F COSTCO WHOLESALE CS 22160K105 21,703 -4,175 -16.13 2,499 -13.53 0.7595
2014-05-15 2014-03-31 13F COSTCO WHOLESALE CS 22160K105 25,878 144 0.56 2,890 -5.65 0.9037
2014-02-14 2013-12-31 13F COSTCO WHOLESALE CS 22160K105 25,734 2,286 9.75 3,063 13.40 0.9620
2013-11-14 2013-09-30 13F COSTCO WHOLESALE CS 22160K105 23,448 3,083 15.14 2,701 19.94 0.9144
2013-08-14 2013-06-30 13F COSTCO WHOLESALE CS 22160K105 20,365 20,365 2,252 0.7983
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.