Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAddenda Capital Inc.
Latest Disclosed Ownership17,500 shares
Latest Disclosed Value $ 17,437,525
Addenda Capital Inc. reports 2.75% increase in ownership of COST / Costco Wholesale Corporation

On April 15, 2026 - Addenda Capital Inc. filed a 13F-HR form disclosing ownership of 17,500 shares of Costco Wholesale Corporation (MX:COST) valued at $17,437,525 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 22, 2026 disclosing 17,031 shares of Costco Wholesale Corporation. This represents a change in shares of 2.75% 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)
2026-04-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 17,500 469 2.75 17,438 18.73 0.4911
2026-01-22 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 17,031 -239 -1.38 14,687 -8.13 0.4310
2025-10-09 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 17,270 5,410 45.62 15,986 36.16 0.4729
2025-07-17 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 11,860 249 2.14 11,741 6.91 0.4214
2025-04-09 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 11,611 -86 -0.74 10,981 2.46 0.4061
2025-01-16 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 11,697 -394 -3.26 10,718 -0.01 0.3783
2024-10-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 12,091 34 0.28 10,719 4.59 0.3824
2024-07-16 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 12,057 -2,959 -19.71 10,248 -6.84 0.4018
2024-04-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 15,016 -2,900 -16.19 11,001 -8.74 0.4177
2024-01-23 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 17,916 -1,378 -7.14 12,054 10.59 0.4710
2023-10-12 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 19,294 -270 -1.38 10,900 3.49 0.4746
2023-07-21 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 19,564 -1,063 -5.15 10,533 2.77 0.4421
2023-04-11 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 20,627 -480 -2.27 10,249 6.36 0.4214
2023-01-12 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 21,107 -466 -2.16 9,635 -5.43 0.4183
2022-10-11 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 21,573 -3,119 -12.63 10,188 -13.91 0.4654
2022-07-13 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 24,692 -2,347 -8.68 11,834 -23.99 0.5665
2022-04-14 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 27,039 2,268 9.16 15,570 10.72 0.6369
2022-01-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 24,771 545 2.25 14,062 29.18 0.6037
2021-10-08 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 24,226 -1,864 -7.14 10,886 5.45 0.5129
2021-07-19 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 26,090 1,604 6.55 10,323 11.89 0.4846
2021-04-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 24,486 0 0.00 9,226 0.00 0.4712
2021-01-19 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 24,486 -220 -0.89 9,226 5.20 0.5813
2020-10-15 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 24,706 -821 -3.22 8,770 13.29 0.6406
2020-07-09 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 25,527 -1,507 -5.57 7,741 0.43 0.5399
2020-04-13 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 27,034 5,111 23.31 7,708 19.62 0.6546
2020-01-31 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 21,923 1,046 5.01 6,444 7.13 0.4259
2019-10-08 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 20,877 -155 -0.74 6,015 8.22 0.4233
2019-07-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 21,032 -4,813 -18.62 5,558 -11.17 0.4028
2019-04-09 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 25,845 1,486 6.10 6,257 26.10 0.4532
2019-01-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 24,359 558 2.34 4,962 -11.25 0.4355
2018-10-16 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 23,801 -6,400 -21.19 5,591 -11.39 0.4620
2018-07-13 2018-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 30,201 -2,811 -8.52 6,310 1.46 0.5129
2018-07-12 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 63,213 30,201 12,529
2018-04-11 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 33,012 -974 -2.87 6,219 -1.69 0.4673
2018-01-12 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 33,986 -2,359 -6.49 6,326 5.95 0.4365
2017-10-11 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 36,345 -1,394 -3.69 5,971 -1.04 0.4173
2017-08-04 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 37,739 -1,604 -4.08 6,034 -8.53 0.4503
2017-04-10 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 39,343 -1,731 -4.21 6,597 0.33 0.5091
2017-01-31 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 41,074 -243 -0.59 6,575 1.34 0.5255
2016-10-17 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 41,317 0 0.00 6,488 0.00 0.5394
2016-08-10 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 41,317 720 1.77 6,488 1.39 0.5396
2016-05-04 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 40,597 120 0.30 6,399 -2.11 0.5592
2016-01-20 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 40,477 -3,620 -8.21 6,537 2.54 0.6164
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 44,097 -1,075 -2.38 6,375 4.47 0.6073
2015-07-08 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 45,172 -114 -0.25 6,102 -11.05 0.5197
2015-05-15 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 45,286 45,286 6,860 0.5805
2015-02-05 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -42,393 -100.00 0 -100.00
2014-11-04 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 42,393 1,760 4.33 5,313 13.55 0.4672
2014-07-31 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 40,633 708 1.77 4,679 4.91 0.3966
2014-05-06 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 39,925 -2,866 -6.70 4,460 -12.41 0.4009
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 42,791 -2,082 -4.64 5,092 -1.49 0.4532
2013-11-06 2013-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 44,873 2,340 5.50 5,169 10.99 0.4751
2013-11-04 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 42,533 4,657
2013-08-12 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 42,533 42,533 4,657 0.4550
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.