Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership19,456 shares
Latest Disclosed Value $ 19,386,949
Renaissance Technologies Llc reports 97.19% decrease in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 19,456 shares of Costco Wholesale Corporation (MX:COST) valued at $19,386,949 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 693,002 shares of Costco Wholesale Corporation. This represents a change in shares of -97.19% 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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 19,456 -673,546 -97.19 19,387 -96.76 0.0303
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 693,002 679,978 5,220.96 597,604 4,856.89 0.9271
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 13,024 13,024 12,057 0.0159
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -121,199 -100.00 0 -100.00
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 121,199 121,199 114,628 0.1735
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -31,051 -100.00 0 -100.00
2024-11-13 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 31,051 26,108 528.18 27,528 555.27 0.0414
2024-08-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 4,943 4,943 4,202 0.0071
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -232,792 -100.00 0 -100.00
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 232,792 93,809 67.50 116 82.54 0.1535
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 138,983 -584,608 -80.79 63 -99.98 0.0868
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 723,591 452,691 167.11 341,730 163.20 0.4835
2022-08-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 270,900 91,400 50.92 129,837 25.61 0.1537
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 179,500 8,100 4.73 103,365 6.23 0.1213
2022-02-11 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 171,400 74,800 77.43 97,304 124.17 0.1211
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 96,600 43,100 80.56 43,407 105.06 0.0561
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 53,500 2,000 3.88 21,168 16.61 0.0264
2021-05-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 51,500 51,500 -3.74 18,153 -14.24 0.0226
2021-02-10 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -160,367 -100.00 0 -100.00
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 160,367 -890,079 -84.73 56,930 -82.13 0.0568
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,050,446 -224,772 -17.63 318,506 -12.40 0.2750
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,275,218 989,205 345.86 363,603 332.53 0.3531
2020-02-13 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 286,013 -176,900 -38.21 84,065 -36.97 0.0646
2019-11-13 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 462,913 462,913 61.85 133,370 58.65 0.1129
2019-08-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -1,154,172 -100.00 0 -100.00
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 1,154,172 431,987 59.82 279,471 89.97 0.2541
2019-02-12 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 722,185 543,172 303.43 147,116 249.88 0.1611
2018-11-13 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 179,013 159,713 827.53 42,047 942.57 0.0432
2018-08-13 2018-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 19,300 -959,600 -98.03 4,033 -97.81 0.0044
2018-08-13 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 978,900 184,454
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 978,900 -1,122,013 -53.41 184,454 -52.83 0.2017
2018-02-13 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 2,100,913 890,200 73.53 391,022 96.58 0.4311
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 1,210,713 -383,787 -24.07 198,908 -22.00 0.2341
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 1,594,500 -297,300 -15.72 255,008 -19.62 0.3254
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 1,891,800 -927,913 -32.91 317,236 -29.73 0.4433
2017-02-13 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 2,819,713 733,500 35.16 451,464 41.89 0.7143
2016-11-14 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 2,086,213 1,748,513 517.77 318,168 499.95 0.5624
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 337,700 -772,513 -69.58 53,032 -69.69 0.1009
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 1,110,213 514,213 86.28 174,947 81.76 0.3325
2016-02-11 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 596,000 -53,400 -8.22 96,254 2.52 0.2097
2015-11-12 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 649,400 -511,539 -44.06 93,884 -40.12 0.2240
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 1,160,939 -34,061 -2.85 156,796 -13.39 0.3572
2015-05-13 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 1,195,000 -760,213 -38.88 181,037 -34.68 0.3855
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 1,955,213 400,300 25.74 277,151 42.23 0.6691
2014-11-12 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 1,554,913 504,013 47.96 194,862 61.01 0.5336
2014-08-13 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 1,050,900 -196,900 -15.78 121,022 -13.15 0.2821
2014-05-14 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 1,247,800 -1,609,713 -56.33 139,354 -59.03 0.3342
2014-02-14 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 2,857,513 1,355,800 90.28 340,101 96.64 0.8144
2013-11-13 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 1,501,713 959,213 176.81 172,952 188.33 0.4196
2013-08-12 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 542,500 542,500 59,984 0.1573
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.