Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionThompson Davis & Co., Inc.
Latest Disclosed Ownership1,304 shares
Latest Disclosed Value $ 1,299,345
Thompson Davis & Co., Inc. reports 0.38% decrease in ownership of COST / Costco Wholesale Corporation

On April 16, 2026 - Thompson Davis & Co., Inc. filed a 13F-HR form disclosing ownership of 1,304 shares of Costco Wholesale Corporation (MX:COST) valued at $1,299,345 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 1,309 shares of Costco Wholesale Corporation. This represents a change in shares of -0.38% 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)
2026-04-16 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 1,304 -5 -0.38 1,299 15.16 0.8666
2026-01-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 1,309 -35 -2.60 1,129 -9.32 0.6758
2025-11-05 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 1,344 -40 -2.89 1,244 -9.20 0.7679
2025-08-20 2025-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,384 -13 -0.93 1,370 3.71 0.9339
2025-08-08 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,584 187 1,568 0.6848
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,397 9 0.65 1,321 3.93 1.0422
2025-02-03 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,388 -7 -0.50 1,272 2.83 0.8179
2024-11-08 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,395 12 0.87 1,237 5.19 0.9132
2024-07-23 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,383 -16 -1.14 1,176 14.75 1.0197
2024-05-02 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,399 18 1.30 1,025 12.40 0.6943
2024-02-05 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,381 131 10.48 912 29.04 0.7755
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,250 100 8.70 706 14.05 0.8734
2023-07-13 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,150 -50 -4.17 619 3.86 0.7011
2023-05-10 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,200 170 16.50 596 26.81 0.7781
2023-02-06 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,030 150 17.05 470 12.98 0.6688
2022-11-09 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 880 -100 -10.20 416 -11.49 0.5649
2022-08-04 2022-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 980 496 102.48 470 68.46 0.7686
2022-08-02 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,310 826 628 0.4835
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 484 484 279 0.3400
2018-02-05 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -480 -100.00 0 -100.00
2017-10-30 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 480 16 3.45 79 6.76 0.1398
2017-08-10 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 464 -294 -38.79 74 -41.73 0.1189
2017-05-08 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 758 -8 -1.04 127 3.25 0.1811
2017-02-07 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 766 229 42.64 123 50.00 0.2038
2016-11-08 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 537 94 21.22 82 17.14 0.1444
2016-08-09 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 443 -863 -66.08 70 -66.02 0.1117
2016-05-02 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 1,306 -370 -22.08 206 -23.99 0.3070
2016-02-01 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 1,676 1,537 1,105.76 271 1,255.00 0.3826
2015-10-30 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 139 -4 -2.80 20 5.26 0.0280
2015-07-24 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 143 -36 -20.11 19 -29.63 0.0219
2015-04-28 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 179 -9 -4.79 27 0.00 0.0325
2015-02-06 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 188 -82 -30.37 27 -20.59 0.0313
2014-11-05 2014-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 270 234 650.00 34 750.00 0.0439
2014-11-04 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 270 34
2014-05-09 2014-03-31 13F COSTCO WHOLESALE CORP COM 22160K105 36 0 0.00 4 0.00 0.0066
2014-02-12 2013-12-31 13F COSTCO WHOLESALE CORP COM 22160K105 36 36 4 0.0060
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.