Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionCullinan Associates Inc
Latest Disclosed Ownership10,048 shares
Latest Disclosed Value $ 10,012,160
Cullinan Associates Inc reports 26.75% decrease in ownership of COST / Costco Wholesale Corporation

On May 1, 2026 - Cullinan Associates Inc filed a 13F-HR form disclosing ownership of 10,048 shares of Costco Wholesale Corporation (MX:COST) valued at $10,012,160 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 13,717 shares of Costco Wholesale Corporation. This represents a change in shares of -26.75% 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)
2026-05-01 2026-03-31 13F Costco Wholesale COM 22160K105 10,048 -3,669 -26.75 10,012 -15.35 0.8098
2026-01-30 2025-12-31 13F Costco Wholesale COM 22160K105 13,717 328 2.45 11,829 -4.56 0.8017
2025-10-27 2025-09-30 13F Costco Wholesale COM 22160K105 13,389 -436 -3.15 12,393 -9.44 0.8069
2025-07-22 2025-06-30 13F Costco Wholesale COM 22160K105 13,825 342 2.54 13,686 7.32 0.9027
2025-04-22 2025-03-31 13F Costco Wholesale COM 22160K105 13,483 600 4.66 12,752 8.02 0.9015
2025-01-24 2024-12-31 13F Costco Wholesale COM 22160K105 12,883 -3,634 -22.00 11,804 -19.53 0.7577
2024-10-23 2024-09-30 13F Costco Wholesale COM 22160K105 16,517 -3,133 -15.94 14,669 -12.18 0.8273
2024-07-10 2024-06-30 13F Costco Wholesale COM 22160K105 19,650 768 4.07 16,702 20.74 0.9450
2024-04-18 2024-03-31 13F Costco Wholesale COM 22160K105 18,882 -2,964 -13.57 13,834 -4.07 0.7757
2024-01-24 2023-12-31 13F Costco Wholesale COM 22160K105 21,846 926 4.43 14,420 22.01 0.8040
2023-10-11 2023-09-30 13F Costco Wholesale COM 22160K105 20,920 1,415 7.25 11,819 12.55 0.6884
2023-07-14 2023-06-30 13F Costco Wholesale COM 22160K105 19,505 -1,705 -8.04 10,501 -0.35 0.5772
2023-04-05 2023-03-31 13F Costco Wholesale COM 22160K105 21,210 5,211 32.57 10,539 150,442.86 0.6157
2023-01-11 2022-12-31 13F Costco Wholesale COM 22160K105 15,999 -2,495 -13.49 7 -99.92 0.4047
2022-10-19 2022-09-30 13F Costco Wholesale COM 22160K105 18,494 2,362 14.64 8,734 12.96 0.5516
2022-07-08 2022-06-30 13F Costco Wholesale COM 22160K105 16,132 1,014 6.71 7,732 -11.18 0.4727
2022-04-21 2022-03-31 13F Costco Wholesale COM 22160K105 15,118 -857 -5.36 8,705 -4.01 0.4568
2022-01-07 2021-12-31 13F Costco Wholesale COM 22160K105 15,975 -1,422 -8.17 9,069 16.02 0.4616
2021-10-08 2021-09-30 13F Costco Wholesale COM 22160K105 17,397 -1,889 -9.79 7,817 2.44 0.4319
2021-07-07 2021-06-30 13F Costco Wholesale COM 22160K105 19,286 -304 -1.55 7,631 10.51 0.4274
2021-04-20 2021-03-31 13F Costco Wholesale COM 22160K105 19,590 -986 -4.79 6,905 -10.94 0.3973
2021-01-14 2020-12-31 13F Costco Wholesale COM 22160K105 20,576 1,921 10.30 7,753 17.06 0.4651
2020-10-09 2020-09-30 13F Costco Wholesale COM 22160K105 18,655 17,185 1,169.05 6,623 1,384.98 0.4270
2020-07-07 2020-06-30 13F Costco Wholesale COM 22160K105 1,470 300 25.64 446 33.53 0.0313
2020-04-01 2020-03-31 13F Costco Wholesale COM 22160K105 1,170 0 0.00 334 -2.91 0.0273
2020-01-15 2019-12-31 13F Costco Wholesale COM 22160K105 1,170 0 0.00 344 2.08 0.0230
2019-10-01 2019-09-30 13F Costco Wholesale COM 22160K105 1,170 0 0.00 337 9.06 0.0240
2019-07-16 2019-06-30 13F Costco Wholesale COM 22160K105 1,170 0 0.00 309 9.19 0.0224
2019-04-30 2019-03-31 13F Costco Wholesale COM 22160K105 1,170 0 0.00 283 18.91 0.0213
2019-01-11 2018-12-31 13F Costco Wholesale COM 22160K105 1,170 -1,700 -59.23 238 -64.69 0.0197
2018-10-19 2018-09-30 13F Costco Wholesale COM 22160K105 2,870 0 0.00 674 12.33 0.0488
2018-07-09 2018-06-30 13F Costco Wholesale COM 22160K105 2,870 -5,020 -63.62 600 -59.65 0.0459
2018-04-26 2018-03-31 13F Costco Wholesale COM 22160K105 7,890 -500 -5.96 1,487 -4.80 0.1126
2018-01-17 2017-12-31 13F Costco Wholesale COM 22160K105 8,390 -160 -1.87 1,562 11.17 0.1147
2017-10-16 2017-09-30 13F Costco Wholesale COM 22160K105 8,550 355 4.33 1,405 7.17 0.1082
2017-07-12 2017-06-30 13F Costco Wholesale COM 22160K105 8,195 -17,230 -67.77 1,311 -69.25 0.1021
2017-04-17 2017-03-31 13F Costco Wholesale COM 22160K105 25,425 -3,900 -13.30 4,264 -9.18 0.3476
2017-01-30 2016-12-31 13F Costco Wholesale COM 22160K105 29,325 0 0.00 4,695 4.99 0.3999
2016-10-03 2016-09-30 13F Costco Wholesale COM 22160K105 29,325 2,095 7.69 4,472 4.58 0.3823
2016-07-01 2016-06-30 13F Costco Wholesale COM 22160K105 27,230 1,830 7.20 4,276 6.82 0.3476
2016-05-20 2016-03-31 13F Costco Wholesale COM 22160K105 25,400 2,710 11.94 4,003 9.25 0.3419
2016-01-12 2015-12-31 13F Costco Wholesale COM 22160K105 22,690 5,250 30.10 3,664 45.34 0.3190
2015-10-05 2015-09-30 13F Costco Wholesale COM 22160K105 17,440 0 0.00 2,521 7.05 0.2303
2015-07-06 2015-06-30 13F Costco Wholesale COM 22160K105 17,440 350 2.05 2,355 -9.04 0.1942
2015-04-14 2015-03-31 13F Costco Wholesale COM 22160K105 17,090 17,090 2,589 0.2009
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.