Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionBLB&B Advisors, LLC
Latest Disclosed Ownership24,576 shares
Latest Disclosed Value $ 24,488,102
BLB&B Advisors, LLC reports 0.80% increase in ownership of COST / Costco Wholesale Corporation

On April 28, 2026 - BLB&B Advisors, LLC filed a 13F-HR form disclosing ownership of 24,576 shares of Costco Wholesale Corporation (MX:COST) valued at $24,488,102 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 24,380 shares of Costco Wholesale Corporation. This represents a change in shares of 0.80% 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)
2026-04-28 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 24,576 196 0.80 24,488 16.48 0.8575
2026-01-26 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 24,380 -1,310 -5.10 21,024 -11.59 0.8789
2025-10-31 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 25,690 561 2.23 23,779 -4.41 1.0265
2025-08-04 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 25,129 -112 -0.44 24,877 4.21 1.1623
2025-04-28 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 25,241 -49 -0.19 23,873 3.02 1.2149
2025-01-28 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 25,290 1,416 5.93 23,173 9.49 1.1822
2024-10-22 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 23,874 -351 -1.45 21,165 2.79 1.0812
2024-07-26 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 24,225 -453 -1.84 20,591 13.89 1.1281
2024-04-26 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 24,678 -821 -3.22 18,080 7.41 1.0195
2024-01-19 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 25,499 -830 -3.15 16,831 13.15 1.0616
2023-10-25 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 26,329 710 2.77 14,875 7.85 1.0619
2023-07-20 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 25,619 340 1.34 13,793 9.81 0.9642
2023-04-24 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 25,279 321 1.29 12,560 10.24 0.9359
2023-01-18 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 24,958 -137 -0.55 11,393 -3.86 0.8829
2022-10-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 25,095 623 2.55 11,851 1.04 0.9855
2022-07-18 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 24,472 2,648 12.13 11,729 -6.68 0.9286
2022-04-20 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 21,824 61 0.28 12,568 1.72 0.8449
2022-01-21 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 21,763 -1,295 -5.62 12,355 19.25 0.8031
2021-10-19 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 23,058 -677 -2.85 10,361 10.33 0.6919
2021-07-20 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 23,735 309 1.32 9,391 13.73 0.6791
2021-04-19 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 23,426 1,227 5.53 8,257 -1.28 0.6492
2021-01-19 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 22,199 1,255 5.99 8,364 12.49 0.6775
2020-10-20 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 20,944 1,097 5.53 7,435 23.55 0.7472
2020-07-16 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 19,847 1,202 6.45 6,018 13.21 0.6522
2020-04-21 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 18,645 795 4.45 5,316 1.33 0.6943
2020-01-21 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 17,850 2,002 12.63 5,246 14.89 0.5455
2019-10-22 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 15,848 1,679 11.85 4,566 21.96 0.5146
2019-07-29 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 14,169 881 6.63 3,744 16.38 0.4298
2019-04-19 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 13,288 1,997 17.69 3,217 39.87 0.3783
2019-01-17 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 11,291 197 1.78 2,300 -11.74 0.3158
2018-10-12 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 11,094 1,020 10.13 2,606 23.80 0.3243
2018-07-11 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 10,074 763 8.19 2,105 20.01 0.2858
2018-04-09 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 9,311 1,061 12.86 1,754 14.19 0.2344
2018-01-16 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 8,250 833 11.23 1,536 26.00 0.2195
2017-10-16 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 7,417 2,707 57.47 1,219 61.89 0.1878
2017-08-04 2017-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,710 70 1.51 753 -3.21 0.1249
2017-07-20 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 4,640 0 778
2017-04-14 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 4,640 140 3.11 778 8.06 0.1321
2017-02-03 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 4,500 15 0.33 720 5.26 0.1254
2016-10-17 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 4,485 50 1.13 684 -0.29 0.1245
2016-07-19 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 4,435 515 13.14 686 11.00 0.1294
2016-04-18 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 3,920 240 6.52 618 4.04 0.1243
2016-01-15 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 3,680 -75 -2.00 594 9.39 0.1256
2015-10-20 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 3,755 75 2.04 543 9.26 0.1203
2015-07-16 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 3,680 450 13.93 497 1.64 0.1033
2015-04-17 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 3,230 -527 -14.03 489 -8.26 0.1019
2015-01-22 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 3,757 -898 -19.29 533 -8.58 0.1127
2014-10-21 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 4,655 -60 -1.27 583 7.37 0.1261
2014-07-17 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 4,715 -290 -5.79 543 -2.86 0.1160
2014-04-11 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 5,005 200 4.16 559 -2.27 0.1231
2014-01-17 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 4,805 1,220 34.03 572 38.50 0.1369
2013-10-16 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 3,585 340 10.48 413 15.04 0.1088
2013-07-11 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 3,245 3,245 359 0.0999
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.