Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionSignaturefd, Llc
Latest Disclosed Ownership13,527 shares
Latest Disclosed Value $ 13,478,503
Signaturefd, Llc reports 7.89% increase in ownership of COST / Costco Wholesale Corporation

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 13,527 shares of Costco Wholesale Corporation (MX:COST) valued at $13,478,503 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 12,538 shares of Costco Wholesale Corporation. This represents a change in shares of 7.89% 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)
2026-04-07 2026-03-31 13F COSTCO WHSL CORP COM 22160K105 13,527 989 7.89 13,479 24.66 0.2066
2026-01-20 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 12,538 0 0.00 10,812 -6.83 0.1651
2025-10-21 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 12,538 -251 -1.96 11,606 -8.33 0.1830
2025-07-16 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 12,789 450 3.65 12,660 8.48 0.2158
2025-05-02 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 12,339 39 0.32 11,670 3.56 0.2209
2025-02-10 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 12,300 -119 -0.96 11,270 2.36 0.2135
2024-10-21 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 12,419 19 0.15 11,010 4.46 0.2097
2024-07-29 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 12,400 231 1.90 10,540 18.22 0.2141
2024-05-03 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 12,169 75 0.62 8,916 11.67 0.1883
2024-02-01 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 12,094 384 3.28 7,983 20.68 0.1843
2023-11-03 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 11,710 388 3.43 6,616 8.53 0.1723
2023-08-01 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 11,322 497 4.59 6,096 13.33 0.1557
2023-04-28 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 10,825 573 5.59 5,379 14.94 0.1469
2023-01-30 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 10,252 -590 -5.44 4,680 -8.63 0.1368
2022-11-08 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 10,842 670 6.59 5,121 5.05 0.1753
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 10,172 6 0.06 4,875 -16.72 0.1660
2022-05-02 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 10,166 390 3.99 5,854 5.48 0.1763
2022-01-25 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 9,776 1,180 13.73 5,550 43.71 0.1706
2021-10-28 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 8,596 953 12.47 3,862 27.71 0.1334
2021-07-26 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 7,643 387 5.33 3,024 18.22 0.1206
2021-04-30 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 7,256 113 1.58 2,558 -4.94 0.1131
2021-02-11 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 7,143 -882 -10.99 2,691 -5.55 0.1268
2020-11-03 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 8,025 1,051 15.07 2,849 34.77 0.1526
2020-07-30 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 6,974 458 7.03 2,114 13.78 0.1277
2020-04-23 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 6,516 1,167 21.82 1,858 18.19 0.1606
2020-02-05 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 5,349 756 16.46 1,572 18.82 0.1161
2019-10-16 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 4,593 444 10.70 1,323 20.71 0.1087
2019-07-31 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 4,149 97 2.39 1,096 11.72 0.0948
2019-05-09 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 4,052 -162 -3.84 981 14.34 0.0835
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 4,214 213 5.32 858 -8.72 0.0800
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 4,001 278 7.47 940 20.82 0.0955
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 3,723 700 23.16 778 36.49 0.0868
2018-05-08 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 3,023 668 28.37 570 30.14 0.0669
2018-02-13 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 2,355 909 62.86 438 84.03 0.0528
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 1,446 159 12.35 238 15.53 0.0316
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 1,287 -179 -12.21 206 -16.26 0.0299
2017-05-15 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 1,466 171 13.20 246 24.87 0.0364
2016-11-14 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 1,295 201 18.37 197 14.53 0.0288
2016-07-29 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 1,094 491 81.43 172 81.05 0.0251
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 603 -240 -28.47 95 -30.15 0.0162
2016-01-22 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 843 169 25.07 136 40.21 0.0263
2015-10-23 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 674 461 216.43 97 234.48 0.0221
2015-07-15 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 213 80 60.15 29 45.00 0.0063
2015-04-15 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 133 53 66.25 20 81.82 0.0048
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 80 40 100.00 11 120.00 0.0027
2014-11-13 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 40 -3 -6.98 5 0.00 0.0016
2014-08-14 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 43 0 0.00 5 0.00 0.0017
2014-05-16 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 43 -703 -94.24 5 -94.38 0.0020
2014-02-11 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 746 18 2.47 89 5.95 0.0324
2013-11-13 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 728 0 0.00 84 5.00 0.0359
2013-08-14 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 728 728 80 0.0413
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.