Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionGraybill Bartz & Assoc Ltd
Latest Disclosed Ownership3,123 shares
Latest Disclosed Value $ 3,111,690
Graybill Bartz & Assoc Ltd reports 2.22% decrease in ownership of COST / Costco Wholesale Corporation

On May 13, 2026 - Graybill Bartz & Assoc Ltd filed a 13F-HR form disclosing ownership of 3,123 shares of Costco Wholesale Corporation (MX:COST) valued at $3,111,690 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,194 shares of Costco Wholesale Corporation. This represents a change in shares of -2.22% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F COSTCO WHOLESALE Stock 22160K105 3,123 -71 -2.22 3,112 12.96 0.9474
2026-02-13 2025-12-31 13F COSTCO WHOLESALE Stock 22160K105 3,194 10 0.31 2,754 -6.55 0.8126
2025-11-24 2025-09-30 13F COSTCO WHOLESALE Stock 22160K105 3,184 -66 -2.03 2,947 -8.39 0.9060
2025-07-31 2025-06-30 13F COSTCO WHOLESALE Stock 22160K105 3,250 -23 -0.70 3,217 3.94 1.0505
2025-05-02 2025-03-31 13F COSTCO WHOLESALE Stock 22160K105 3,273 -1,213 -27.04 3,095 -22.16 1.0619
2024-10-21 2024-09-30 13F COSTCO WHOLESALE Stock 22160K105 4,486 -108 -2.35 3,977 1.84 1.4739
2024-07-22 2024-06-30 13F COSTCO WHOLESALE Stock 22160K105 4,594 -183 -3.83 3,905 11.57 1.5848
2024-04-15 2024-03-31 13F COSTCO WHOLESALE Stock 22160K105 4,777 -151 -3.06 3,500 7.60 1.4746
2024-02-08 2023-12-31 13F COSTCO WHOLESALE Stock 22160K105 4,928 -339 -6.44 3,253 9.31 1.4400
2023-11-03 2023-09-30 13F COSTCO WHOLESALE Stock 22160K105 5,267 -62 -1.16 2,976 3.73 1.4517
2023-07-21 2023-06-30 13F COSTCO WHOLESALE Stock 22160K105 5,329 -33 -0.62 2,869 7.66 1.3624
2023-04-27 2023-03-31 13F COSTCO WHOLESALE Stock 22160K105 5,362 -80 -1.47 2,664 7.25 1.3570
2023-01-23 2022-12-31 13F COSTCO WHOLESALE Stock 22160K105 5,442 29 0.54 2,484 -2.82 1.3453
2022-10-28 2022-09-30 13F COSTCO WHOLESALE Stock 22160K105 5,413 -39 -0.72 2,556 -2.18 1.5182
2022-07-29 2022-06-30 13F COSTCO WHOLESALE Stock 22160K105 5,452 -1,814 -24.97 2,613 -37.55 1.4468
2022-05-12 2022-03-31 13F COSTCO WHOLESALE Stock 22160K105 7,266 -1,428 -16.43 4,184 -15.24 2.0405
2022-01-28 2021-12-31 13F COSTCO WHOLESALE Stock 22160K105 8,694 -52 -0.59 4,936 25.60 2.2381
2021-10-22 2021-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 8,746 -399 -4.36 3,930 8.62 1.9347
2021-07-27 2021-06-30 13F Costco Wholesale COM 22160K105 9,145 -87 -0.94 3,618 11.19 1.7837
2021-04-19 2021-03-31 13F Costco Wholesale COM 22160K105 9,232 272 3.04 3,254 -3.61 1.7236
2021-01-20 2020-12-31 13F Costco Wholesale COM 22160K105 8,960 -48 -0.53 3,376 5.57 1.9044
2020-10-19 2020-09-30 13F Costco Wholesale COM 22160K105 9,008 -74 -0.81 3,198 16.12 2.0831
2020-07-20 2020-06-30 13F Costco Wholesale COM 22160K105 9,082 -47 -0.51 2,754 5.80 2.0265
2020-04-30 2020-03-31 13F Costco Wholesale COM 22160K105 9,129 -3,547 -27.98 2,603 -30.14 2.3008
2020-01-24 2019-12-31 13F Costco Wholesale COM 22160K105 12,676 -307 -2.36 3,726 -0.37 2.3218
2019-10-24 2019-09-30 13F Costco Wholesale COM 22160K105 12,983 -185 -1.40 3,740 7.47 2.5307
2019-07-25 2019-06-30 13F Costco Wholesale COM 22160K105 13,168 -65 -0.49 3,480 8.61 2.3873
2019-04-24 2019-03-31 13F Costco Wholesale COM 22160K105 13,233 791 6.36 3,204 26.44 2.2382
2019-02-06 2018-12-31 13F Costco Wholesale COM 22160K105 12,442 440 3.67 2,534 -10.11 2.1120
2018-10-12 2018-09-30 13F Costco Wholesale COM 22160K105 12,002 -115 -0.95 2,819 11.33 2.0436
2018-07-23 2018-06-30 13F Costco Wholesale COM 22160K105 12,117 -350 -2.81 2,532 7.79 1.9427
2018-04-18 2018-03-31 13F Costco Wholesale COM 22160K105 12,467 -205 -1.62 2,349 -0.38 1.7877
2018-01-16 2017-12-31 13F Costco Wholesale COM 22160K105 12,672 50 0.40 2,358 13.69 1.6995
2017-10-18 2017-09-30 13F Costco Wholesale COM 22160K105 12,622 447 3.67 2,074 6.52 1.5338
2017-08-04 2017-06-30 13F Costco Wholesale COM 22160K105 12,175 -30 -0.25 1,947 -4.89 1.5388
2017-04-17 2017-03-31 13F Costco Wholesale COM 22160K105 12,205 145 1.20 2,047 6.01 1.6232
2017-01-30 2016-12-31 13F Costco Wholesale COM 22160K105 12,060 315 2.68 1,931 7.82 1.6472
2016-10-18 2016-09-30 13F Costco Wholesale COM 22160K105 11,745 -192 -1.61 1,791 -4.48 1.6644
2016-07-19 2016-06-30 13F Costco Wholesale COM 22160K105 11,937 -195 -1.61 1,875 -1.94 1.7342
2016-04-05 2016-03-31 13F Costco Wholesale COM 22160K105 12,132 35 0.29 1,912 -2.15 1.7265
2016-02-01 2015-12-31 13F Costco Wholesale COM 22160K105 12,097 -4,620 -27.64 1,954 -19.16 1.6879
2015-10-26 2015-09-30 13F Costco Wholesale COM 22160K105 16,717 145 0.87 2,417 8.00 1.9810
2015-07-15 2015-06-30 13F Costco Wholesale COM 22160K105 16,572 -335 -1.98 2,238 -12.61 1.6561
2015-04-20 2015-03-31 13F Costco Wholesale COM 22160K105 16,907 16,907 2,561 1.9236
2015-01-26 2014-12-31 13F Costco Wholesale COM 22160K105 0 -17,072 -100.00 0 -100.00
2014-11-04 2014-09-30 13F Costco Wholesale COM 22160K105 17,072 -326 -1.87 2,139 6.74 1.6405
2014-08-20 2014-06-30 13F Costco Wholesale COM 22160K105 17,398 5 0.03 2,004 3.19 1.5500
2014-04-28 2014-03-31 13F Costco Wholesale COM 22160K105 17,393 125 0.72 1,942 -5.50 1.5987
2014-01-22 2013-12-31 13F Costco Wholesale COM 22160K105 17,268 -76 -0.44 2,055 2.85 1.7957
2013-10-25 2013-09-30 13F Costco Wholesale COM 22160K105 17,344 -868 -4.77 1,998 -0.79 1.7050
2013-08-06 2013-06-30 13F Costco Wholesale COM 22160K105 18,212 18,212 2,014 1.8084
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.