Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionFirst Dallas Securities Inc.
Latest Disclosed Ownership2,557 shares
Latest Disclosed Value $ 2,547,739
First Dallas Securities Inc. reports 2.20% increase in ownership of COST / Costco Wholesale Corporation

On April 27, 2026 - First Dallas Securities Inc. filed a 13F-HR form disclosing ownership of 2,557 shares of Costco Wholesale Corporation (MX:COST) valued at $2,547,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 2,502 shares of Costco Wholesale Corporation. This represents a change in shares of 2.20% 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)
2026-04-27 2026-03-31 13F Costco Wholesale COM 22160K105 2,557 55 2.20 2,548 18.08 0.9425
2026-02-11 2025-12-31 13F Costco Wholesale COM 22160K105 2,502 -153 -5.76 2,157 -12.21 0.8028
2026-02-11 2025-12-31 13F Costco Wholesale COM 22160K105 2,502 2,157
2025-11-05 2025-09-30 13F Costco Wholesale COM 22160K105 2,655 -48 -1.78 2,457 -8.15 0.9206
2025-08-07 2025-06-30 13F Costco Wholesale COM 22160K105 2,703 0 0.00 2,676 4.66 1.0575
2025-05-16 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,703 -50 -1.82 2,556 1.35 1.0681
2025-01-24 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,753 -400 -12.69 2,522 -9.77 1.0278
2024-11-18 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 3,153 -135 -4.11 2,795 0.00 1.1683
2024-08-02 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 3,288 77 2.40 2,796 139,650.00 1.2271
2024-04-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 3,211 44 1.39 2 0.00 1.0819
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 3,167 359 12.78 2 100.00 1.0768
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,808 -266 -8.65 2 0.00 0.3632
2023-08-07 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 3,074 50 1.65 2 0.00 0.9233
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 3,024 3 0.10 2 0.00 0.8860
2023-02-03 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 3,021 313 11.56 1 -99.92 0.8312
2022-10-21 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,708 3 0.11 1,279 -1.39 0.8788
2022-07-28 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,705 5 0.19 1,297 -16.59 0.8741
2022-05-12 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,700 1,117 70.56 1,555 72.97 0.8784
2022-02-07 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 1,583 0 0.00 899 26.44 0.5896
2021-10-06 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 1,583 0 0.00 711 13.58 0.4907
2021-07-06 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 1,583 268 20.38 626 34.91 0.4103
2021-05-26 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,315 -40 -2.95 464 -9.20 0.3947
2021-02-01 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,355 -15 -1.09 511 5.14 0.4614
2020-10-15 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 1,370 -75 -5.19 486 17.96 0.5464
2020-05-04 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,445 0 0.00 412 -3.06 0.5743
2020-02-04 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 1,445 -35 -2.36 425 -0.23 0.3627
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 1,480 -300 -16.85 426 -9.36 0.3777
2019-08-22 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 1,780 -250 -12.32 470 -4.47 0.4111
2019-05-17 2019-03-31 13F Costco Wholesale COM 22160K105 2,030 -1,400 -40.82 492 -29.61 0.3538
2019-02-11 2018-12-31 13F Costco Wholesale COM 22160K105 3,430 -250 -6.79 699 -19.10 0.5826
2018-10-31 2018-09-30 13F Costco Wholesale COM 22160K105 3,680 -50 -1.34 864 10.91 0.5398
2018-07-31 2018-06-30 13F Costco Wholesale COM 22160K105 3,730 0 0.00 779 10.81 0.4981
2018-05-04 2018-03-31 13F Costco Wholesale COM 22160K105 3,730 -1,325 -26.21 703 -25.29 0.4591
2018-02-07 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 5,055 -2,025 -28.60 941 -19.09 0.5983
2017-11-07 2017-09-30 13F Costco Whsl Corp COM 22160K105 7,080 700 10.97 1,163 14.02 0.8061
2017-08-14 2017-06-30 13F Costco Wholesale COM 22160K105 6,380 1,900 42.41 1,020 35.82 0.7451
2017-05-05 2017-03-31 13F Costco Wholesale COM 22160K105 4,480 -744 -14.24 751 -10.17 0.5236
2017-01-11 2016-12-31 13F COSTCO WHOLESALE COM 22160K105 5,224 -45 -0.85 836 4.11 0.5720
2016-11-15 2016-09-30 13F COSTCO WHOLESALE COM 22160K105 5,269 -184 -3.37 803 -6.19 0.5958
2016-07-26 2016-06-30 13F COSTCO WHOLESALE COM 22160K105 5,453 -414 -7.06 856 -7.46 0.6609
2016-05-03 2016-03-31 13F COSTCO WHOLESALE COM 22160K105 5,867 -650 -9.97 925 -12.07 0.7484
2016-01-27 2015-12-31 13F COSTCO WHOLESALE COM 22160K105 6,517 -799 -10.92 1,052 -0.57 0.8616
2015-11-12 2015-09-30 13F COSTCO WHOLESALE COM 22160K105 7,316 -1,700 -18.86 1,058 -13.06 0.8697
2015-07-27 2015-06-30 13F Costco Wholesale COM 22160K105 9,016 -1,000 -9.98 1,217 -19.78 0.8777
2015-05-05 2015-03-31 13F/A-1 Costco Wholesale COM 22160K105 10,016 -702 -6.55 1,517 -0.13 1.0578
2015-05-05 2015-03-31 13F Costco Wholesale COM 22160K105 10,016 1,517
2015-02-17 2014-12-31 13F Costco Wholesale COM 22160K105 10,718 -583 -5.16 1,519 7.27 0.9885
2014-11-12 2014-09-30 13F Costco Wholesale COM 22160K105 11,301 -24 -0.21 1,416 8.51 0.8410
2014-07-11 2014-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 11,325 1,784 18.70 1,305 22.42 0.7843
2014-04-15 2014-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 9,541 3,239 51.40 1,066 42.13 0.7118
2014-01-29 2013-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 6,302 1 0.02 750 3.31 0.5026
2013-11-13 2013-09-30 13F/A-1 COSTCO WHSL CORP NEW COM COM 22160K105 6,301 0 0.00 726 4.16 0.5543
2013-11-12 2013-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 6,301 726
2013-08-15 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 6,301 6,301 697 0.5368
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.