Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionRoundview Capital LLC
Latest Disclosed Ownership18,060 shares
Latest Disclosed Value $ 17,995,184
Roundview Capital LLC reports 0.17% increase in ownership of COST / Costco Wholesale Corporation

On May 8, 2026 - Roundview Capital LLC filed a 13F-HR form disclosing ownership of 18,060 shares of Costco Wholesale Corporation (MX:COST) valued at $17,995,184 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 18,029 shares of Costco Wholesale Corporation. This represents a change in shares of 0.17% 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)
2026-05-08 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 18,060 31 0.17 17,995 15.75 1.1209
2026-02-09 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 18,029 645 3.71 15,547 -3.38 0.9563
2025-11-12 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 17,384 124 0.72 16,091 -5.83 1.0172
2025-07-23 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 17,260 292 1.72 17,086 6.47 1.1420
2025-05-06 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 16,968 101 0.60 16,048 3.84 1.1579
2025-02-12 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 16,867 323 1.95 15,455 5.38 1.0791
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 16,544 211 1.29 14,667 5.64 1.0626
2024-08-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 16,333 116 0.72 13,883 16.85 1.0934
2024-05-06 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 16,217 330 2.08 11,881 13.30 0.9713
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 15,887 -200 -1.24 10,487 15.38 0.9668
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 16,087 -200 -1.23 9,089 3.65 0.9138
2023-08-09 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 16,287 108 0.67 8,769 9.08 0.8561
2023-05-09 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 16,179 1,316 8.85 8,039 18.48 0.8409
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 14,863 383 2.65 6,785 -0.79 0.7741
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 14,480 7 0.05 6,838 -1.43 0.8632
2022-08-11 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 14,473 72 0.50 6,937 -16.35 0.8306
2022-05-17 2022-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 14,401 415 2.97 8,293 4.45 0.8521
2022-05-11 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 14,401 415 8,293 0.8230
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 13,986 1,163 9.07 7,940 37.80 0.7918
2021-11-10 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 12,823 702 5.79 5,762 20.14 0.6351
2021-08-10 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 12,121 395 3.37 4,796 16.04 0.5351
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 11,726 697 6.32 4,133 -0.55 0.5201
2021-02-08 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 11,029 187 1.72 4,156 7.98 0.5686
2020-11-05 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 10,842 -173 -1.57 3,849 15.24 0.6039
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 11,015 79 0.72 3,340 7.12 0.5673
2020-05-11 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 10,936 -5 -0.05 3,118 -3.05 0.6592
2020-02-10 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 10,941 311 2.93 3,216 5.00 0.6112
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 10,630 215 2.06 3,063 11.30 0.6611
2019-08-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 10,415 458 4.60 2,752 14.14 0.6198
2019-05-09 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 9,957 663 7.13 2,411 27.36 0.5729
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 9,294 857 10.16 1,893 -4.49 0.5308
2018-11-07 2018-09-30 13F Costco Wholesale COM 22160K105 8,437 36 0.43 1,982 12.87 0.4891
2018-08-10 2018-06-30 13F Costco Wholesale COM 22160K105 8,401 385 4.80 1,756 16.21 0.4603
2018-05-14 2018-03-31 13F Costco Wholesale COM 22160K105 8,016 -77 -0.95 1,511 0.33 0.4253
2018-02-07 2017-12-31 13F Costco Wholesale COM 22160K105 8,093 140 1.76 1,506 15.23 0.3890
2017-11-13 2017-09-30 13F/A-1 Costco Wholesale COM 22160K105 7,953 206 2.66 1,307 5.49 0.3739
2017-11-13 2017-09-30 13F Costco Wholesale COM 22160K105 7,747 0 1,239 361,438.4023
2017-08-11 2017-06-30 13F Costco Wholesale COM 22160K105 7,747 2,413 45.24 1,239 38.59 0.3614
2017-05-11 2017-03-31 13F Costco Wholesale COM 22160K105 5,334 279 5.52 894 10.51 0.2775
2017-02-14 2016-12-31 13F Costco Wholesale COM 22160K105 5,055 2,866 130.93 809 142.22 0.2597
2016-11-14 2016-09-30 13F Costco Wholesale COM 22160K105 2,189 0 0.00 334 -2.91 0.1180
2016-08-12 2016-06-30 13F Costco Wholesale COM 22160K105 2,189 -300 -12.05 344 -12.24 0.1266
2016-05-12 2016-03-31 13F Costco Wholesale COM 22160K105 2,489 300 13.70 392 10.73 0.1461
2016-02-11 2015-12-31 13F Costco Wholesale COM 22160K105 2,189 0 0.00 354 12.03 0.1402
2015-11-12 2015-09-30 13F Costco Wholesale COM 22160K105 2,189 100 4.79 316 12.06 0.1355
2015-08-14 2015-06-30 13F Costco Wholesale COM 22160K105 2,089 -100 -4.57 282 -15.06 0.1062
2015-05-15 2015-03-31 13F Costco Wholesale COM 22160K105 2,189 -7,192 -76.67 332 -75.04 0.1314
2015-02-13 2014-12-31 13F Costco Wholesale COM 22160K105 9,381 6,820 266.30 1,330 314.33 0.5459
2014-11-14 2014-09-30 13F Costco Wholesale COM 22160K105 2,561 0 0.00 321 8.81 0.1443
2014-08-08 2014-06-30 13F Costco Wholesale COM 22160K105 2,561 402 18.62 295 22.41 0.1193
2014-04-30 2014-03-31 13F Costco Wholesale COM 22160K105 2,159 0 0.00 241 -6.23 0.1170
2014-02-12 2013-12-31 13F Costco Wholesale COM 22160K105 2,159 0 0.00 257 3.21 0.1178
2013-11-12 2013-09-30 13F Costco Wholesale COM 22160K105 2,159 100 4.86 249 9.21 0.1293
2013-07-30 2013-06-30 13F Costco Wholesale COM 22160K105 2,059 2,059 228 0.1431
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.