Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAvestar Capital, LLC
Latest Disclosed Ownership5,629 shares
Latest Disclosed Value $ 5,609,113
Avestar Capital, LLC ownership in COST / Costco Wholesale Corporation

On May 13, 2026 - Avestar Capital, LLC filed a 13F-HR form disclosing ownership of 5,629 shares of Costco Wholesale Corporation (MX:COST) valued at $5,609,113 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 5,361 shares of Costco Wholesale Corporation. This represents a change in shares of 5.00% during the quarter.

Avestar Capital, 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)
2026-05-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 5,629 268 5.00 5,609 21.33 0.3603
2026-02-10 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 5,361 66 1.25 4,623 -5.67 0.2996
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 5,295 -292 -5.23 4,902 -11.39 0.3209
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 5,587 397 7.65 5,532 12.67 0.3780
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 5,190 589 12.80 4,909 16.47 0.4262
2025-01-29 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,601 448 10.79 4,216 14.48 0.3583
2024-11-13 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 4,153 202 5.11 3,682 9.65 0.3789
2024-08-08 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 3,951 674 20.57 3,358 39.86 0.3449
2024-05-10 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 3,277 627 23.66 2,401 34.28 0.2518
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,650 514 24.06 1,789 48.26 0.2028
2023-10-20 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,136 142 7.12 1,207 12.29 0.1716
2023-08-02 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,994 321 19.19 1,074 29.24 0.1721
2023-04-20 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,673 182 12.21 831 22.21 0.1483
2023-01-20 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,491 190 14.60 681 10.75 0.1232
2022-10-26 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,301 -205 -13.61 614 -14.96 0.1565
2022-07-28 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,506 735 95.33 722 62.61 0.1778
2022-04-26 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 771 151 24.35 444 26.14 0.0709
2022-02-01 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 620 620 352 0.0430
2020-02-14 2019-12-31 13F COSTCO WHOLESALE CORP COM USD0.01 COM 22160K105 0 -747 -100.00 0 -100.00
2019-11-15 2019-09-30 13F/A-1 COSTCO WHOLESALE CORP COM USD0.01 COM 22160K105 747 11 1.49 215 22.86 0.1337
2019-11-14 2019-09-30 13F COSTCO WHOLESALE CORP COM USD0.01 COM 22160K105 747 11 215 0.1337
2019-08-06 2019-06-30 13F COSTCO WHOLESALE CORP COM USD0.01 COM 22160K105 736 -24 -3.16 175 11.46 0.1109
2019-05-09 2019-03-31 13F COSTCO WHOLESALE CORP COM USD0.01 COM 22160K105 760 331 77.16 157 130.88 0.1031
2019-01-25 2018-12-31 13F COSTCO WHOLESALE COM 22160K105 429 -54 -11.18 68 -23.60 0.0465
2018-10-23 2018-09-30 13F COSTCO WHOLESALE COM 22160K105 483 23 5.00 89 12.66 0.0515
2018-08-10 2018-06-30 13F COSTCO WHOLESALE COM 22160K105 460 37 8.75 79 36.21 0.0499
2018-05-10 2018-03-31 13F COSTCO WHOLESALE COM 22160K105 423 56 15.26 58 18.37 0.0377
2018-02-14 2017-12-31 13F COSTCO WHOLESALE COM 22160K105 367 367 49 0.0366
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
(%)
2023-08-02 2023-06-30 13F COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-04-20 2023-03-31 13F COSTCO WHSL CORP COM Call 1,000 497 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.