Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionRB Capital Management, LLC
Latest Disclosed Ownership16,540 shares
Latest Disclosed Value $ 16,480,869
RB Capital Management, LLC ownership in COST / Costco Wholesale Corporation

On May 14, 2026 - RB Capital Management, LLC filed a 13F-HR form disclosing ownership of 16,540 shares of Costco Wholesale Corporation (MX:COST) valued at $16,480,869 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 16,579 shares of Costco Wholesale Corporation. This represents a change in shares of -0.24% during the quarter.

RB Capital Management, LLC has a history of taking positions in derivatives of the underlying security (COST) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:COST / Costco Wholesale Corporation Historical Put/Call Ratio
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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 16,540 -39 -0.24 16,481 15.28 3.5010
2026-02-03 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 16,579 -214 -1.27 14,297 -8.02 2.8399
2025-10-21 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 16,793 -221 -1.30 15,544 -7.71 3.2082
2025-07-07 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 17,014 24 0.14 16,843 4.82 3.8137
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 16,990 -114 -0.67 16,069 2.53 3.7271
2025-02-18 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 17,104 -209 -1.21 15,672 2.11 3.5751
2024-11-18 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 17,313 -82 -0.47 15,348 3.81 3.5713
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 17,395 -203 -1.15 14,785 14.67 3.6455
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 17,598 260 1.50 12,893 12.66 3.3872
2024-02-06 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 17,338 148 0.86 11,444 17.85 3.2773
2023-11-16 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 17,190 -8 -0.05 9,711 4.89 3.0262
2023-12-11 2023-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 17,198 79 0.46 9,259 8.85 2.7852
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 17,198 79 9,259 2.3783
2023-05-10 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 17,119 248 1.47 8,506 10.44 2.6916
2023-01-19 2022-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 16,871 51 0.30 7,702 -3.05 2.7197
2023-01-11 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 16,871 51 8 2.6951
2022-10-24 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 16,820 370 2.25 7,943 0.75 3.0440
2022-07-14 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 16,450 193 1.19 7,884 -15.79 2.9383
2022-05-10 2022-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 16,257 81 0.50 9,362 1.95 3.0038
2022-04-11 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 16,257 81 9,362 3.2691
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 16,176 -391 -2.36 9,183 23.36 2.8657
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 16,567 325 2.00 7,444 15.82 2.7981
2021-08-06 2021-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 16,242 9 0.06 6,427 12.32 2.4269
2021-08-06 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 16,242 9 6,427 1.5785
2021-05-11 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 16,233 -7 -0.04 5,722 -6.49 2.5241
2021-02-04 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 16,240 -146 -0.89 6,119 4.14 2.8259
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 16,386 328 2.04 5,876 20.68 2.7616
2020-07-31 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 16,058 132 0.83 4,869 4.89 2.5803
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 15,926 425 2.74 4,642 2.65 2.9828
2020-02-11 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 15,501 300 1.97 4,522 1.39 2.5808
2019-10-10 2019-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 15,201 676 4.65 4,460 16.18 2.8622
2019-10-10 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 15,201 676 4,460
2019-08-07 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 14,525 -25 -0.17 3,839 8.97 2.7952
2019-05-08 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 14,550 213 1.49 3,523 20.65 2.8727
2019-01-15 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 14,337 -52 -0.36 2,920 -13.61 2.9441
2018-11-13 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 14,389 -555 -3.71 3,380 8.23 2.9987
2018-07-27 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 14,944 618 4.31 3,123 15.71 2.3137
2018-04-18 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 14,326 -217 -1.49 2,699 -0.30 2.1222
2018-02-02 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 14,543 6 0.04 2,707 13.36 1.9278
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 14,537 756 5.49 2,388 8.35 0.0315
2017-07-10 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 13,781 957 7.46 2,204 2.46 1.9015
2017-05-04 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 12,824 31 0.24 2,151 5.03 2.0375
2017-02-15 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 12,793 12,793 2,048 2.0466
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2019-10-10 2019-09-30 13F/A COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-07 2019-06-30 13F COSTCO WHSL CORP COM Call 200 1 n/a n/a n/a
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.