Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionProspera Financial Services Inc
Latest Disclosed Ownership26,316 shares
Latest Disclosed Value $ 26,243,860
Prospera Financial Services Inc reports 1.89% decrease in ownership of COST / Costco Wholesale Corporation

On April 14, 2026 - Prospera Financial Services Inc filed a 13F-HR form disclosing ownership of 26,316 shares of Costco Wholesale Corporation (MX:COST) valued at $26,243,860 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 26,823 shares of Costco Wholesale Corporation. This represents a change in shares of -1.89% 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)
2026-04-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 26,316 -507 -1.89 26,244 13.37 0.4226
2026-02-09 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 26,823 1,373 5.39 23,149 -1.82 0.3800
2025-11-06 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 25,450 -4,413 -14.78 23,577 -20.30 0.4022
2025-08-06 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 29,863 2,057 7.40 29,583 12.42 0.5511
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 27,806 569 2.09 26,314 5.37 0.6046
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 27,237 911 3.46 24,972 6.92 0.5816
2024-11-07 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 26,326 7,175 37.47 23,354 43.31 0.5964
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 19,151 955 5.25 16,297 22.10 0.4531
2024-08-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 18,196 474 2.67 13,346 14.10 0.3976
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 17,722 -809 -4.37 11,698 11.64 0.3873
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 18,531 -174 -0.93 10,478 3.95 0.4051
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 18,705 4,360 30.39 10,079 41.28 0.3857
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 14,345 -2,215 -13.38 7,134 -5.63 0.2932
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 16,560 -3,300 -16.62 7,560 -19.44 0.3787
2022-10-27 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 19,860 1,170 6.26 9,384 4.64 0.4896
2022-08-08 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 18,690 3,662 24.37 8,968 3.83 0.4573
2022-05-04 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 15,028 4,862 47.83 8,637 49.51 0.3617
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 10,166 1,256 14.10 5,777 44.17 0.2497
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 8,910 708 8.63 4,007 23.33 0.1996
2021-08-16 2021-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 8,202 91 1.12 3,249 13.52 0.1629
2021-08-12 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 8,202 91 3,248 0.1672
2021-05-06 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 8,111 95 1.19 2,862 -5.33 0.1698
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 8,016 6,934 640.85 3,023 714.82 0.2083
2020-11-04 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 1,082 -7,595 -87.53 371 -84.01 0.1418
2020-08-10 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 8,677 -5,739 -39.81 2,320 -43.57 0.2056
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 14,416 -879 -5.75 4,111 -8.54 0.4363
2020-02-12 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 15,295 9,638 170.37 4,495 175.77 0.3463
2019-10-22 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 5,657 -1,112 -16.43 1,630 -9.09 0.1674
2019-08-14 2019-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 6,769 29 0.43 1,793 8.27 0.2013
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 4,100 -2,640 836
2019-05-02 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 6,740 2,640 64.39 1,656 98.09 0.5451
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 4,100 246 6.38 836 0.97 0.1687
2018-10-25 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 3,854 -436 -10.16 828 -7.69 0.1543
2018-07-18 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 4,290 -195 -4.35 897 6.66 0.1215
2018-04-12 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 4,485 68 1.54 841 1.82 0.1174
2018-01-23 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 4,417 -6 -0.14 826 13.46 0.1262
2017-10-11 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 4,423 103 2.38 728 5.97 0.1107
2017-07-19 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 4,320 -902 -17.27 687 -21.49 0.1102
2017-04-13 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 5,222 -158 -2.94 875 1.04 0.1577
2017-01-11 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 5,380 -45 -0.83 866 4.59 0.1697
2016-10-12 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 5,425 362 7.15 828 4.15 0.1663
2016-07-26 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 5,063 288 6.03 795 5.58 0.1644
2016-04-12 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 4,775 -92 -1.89 753 -4.20 0.1676
2016-01-12 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 4,867 680 16.24 786 38.14 0.1724
2015-10-16 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 4,187 854 25.62 569 36.45 0.1439
2015-08-07 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 3,333 -377 -10.16 417 -20.42 0.0992
2015-04-22 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 3,710 622 20.14 524 19.63 0.1167
2015-01-14 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 3,088 989 47.12 438 88.79 0.1092
2014-10-16 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 2,099 -24 -1.13 232 -4.92 0.0625
2014-07-07 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 2,123 -58 -2.66 244 12.96 0.0660
2014-04-04 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 2,181 472 27.62 216 6.40 0.0682
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 1,709 -663 -27.95 203 -25.64 0.0683
2013-11-04 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 2,372 -3,757 -61.30 273 -59.68 0.1036
2013-08-15 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 6,129 6,129 677 0.3134
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.