코스트코 도매공사
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionCastleark Management Llc
Latest Disclosed Ownership2,800 shares
Latest Disclosed Value $ 2,790,004
Castleark Management Llc ownership in COST / Costco Wholesale Corporation

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 2,800 shares of Costco Wholesale Corporation (MX:COST) valued at $2,790,004 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,800 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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,800 0 0.00 2,790 15.58 0.0923
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,415 -6.83 0.0709
2025-11-17 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,592 -6.50 0.0727
2025-08-18 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,772 4.65 0.0833
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,648 3.24 0.0918
2025-02-18 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,566 3.34 0.0895
2024-11-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,482 4.33 0.1012
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,380 15.99 0.0972
2024-05-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 2,051 10.98 0.0853
2024-02-15 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,848 16.89 0.0819
2023-11-15 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,582 4.91 0.0806
2023-08-16 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,507 8.34 0.0683
2023-05-16 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,391 8.84 0.0683
2023-02-10 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,278 -3.33 0.0668
2022-11-15 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,322 -1.49 0.0736
2022-08-16 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,342 -16.75 0.0718
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,612 1.38 0.0696
2022-02-16 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,590 26.39 0.0585
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,258 13.54 0.0481
2021-08-17 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,108 12.26 0.0372
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 987 -6.45 0.0355
2021-02-17 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 1,055 6.14 0.0395
2020-11-16 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 994 17.08 0.0390
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 -41,980 -93.75 849 -93.35 0.0369
2020-05-13 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 44,780 -4,460 -9.06 12,768 -11.78 0.7560
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 49,240 -2,090 -4.07 14,473 -2.14 0.5792
2019-11-15 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 51,330 -43,374 -45.80 14,789 -40.91 0.6033
2019-08-13 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 94,704 -48,290 -33.77 25,026 -27.72 0.9601
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 142,994 -10,500 -6.84 34,625 10.74 1.3034
2019-02-12 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 153,494 -81,057 -34.56 31,268 -43.24 1.3324
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 234,551 47,920 25.68 55,091 41.25 1.5831
2018-08-15 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 186,631 183,831 6,565.39 39,002 7,286.74 1.2005
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 528 1.34 0.0167
2018-02-15 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 521 13.26 0.0156
2017-11-15 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 -34,971 -92.59 460 -92.39 0.0144
2017-08-15 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 37,771 -199,089 -84.05 6,041 -84.79 0.1974
2017-05-15 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 236,860 93,251 64.93 39,719 72.74 1.2446
2017-02-15 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 143,609 -15,411 -9.69 22,993 -5.19 0.7334
2016-11-15 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 159,020 -8,160 -4.88 24,252 -7.63 0.7335
2016-08-10 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 167,180 164,380 5,870.71 26,254 5,853.29 0.8374
2016-05-17 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 441 -2.43 0.0138
2016-02-17 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 452 11.60 0.0136
2015-11-17 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 405 7.14 0.0130
2015-08-17 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 378 -10.85 0.0101
2015-05-15 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 2,800 0 0.00 424 6.80 0.0102
2015-02-10 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 2,800 -619,800 -99.55 397 -99.43 0.0102
2014-11-17 2014-09-30 13F COSTCO WHSL COM 22160K105 622,600 619,800 22,135.71 69,532 21,493.79 1.9771
2014-08-15 2014-06-30 13F COSTCO WHLSL CORP COM 22160K105 2,800 -619,800 -99.55 322 -99.54 0.0089
2014-05-20 2014-03-31 13F COSTCO WHSL COM 22160K105 622,600 -82,873 -11.75 69,532 -17.19 1.9771
2014-02-20 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 705,473 702,673 25,095.46 83,965 23,821.65 2.4373
2014-11-21 2013-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 2,800 -635,780 -99.56 351 -99.50 0.0099
2013-11-20 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 748,460 86,200
2013-09-26 2013-06-30 13F COSTCO WHOLESALE COM 22160K105 638,580 638,580 70,608 2.3425
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.