Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionPrivate Advisor Group, LLC
Latest Disclosed Ownership75,972 shares
Latest Disclosed Value $ 75,700,121
Private Advisor Group, LLC ownership in COST / Costco Wholesale Corporation

On April 24, 2026 - Private Advisor Group, LLC filed a 13F-HR form disclosing ownership of 75,972 shares of Costco Wholesale Corporation (MX:COST) valued at $75,700,121 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 78,020 shares of Costco Wholesale Corporation. This represents a change in shares of -2.62% during the quarter.

Private Advisor Group, 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 and put options representing 0 of underlying shares valued at $2,460 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)
2026-04-24 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 75,972 -2,048 -2.62 75,700 12.52 0.3362
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 78,020 -585 -0.74 67,280 -7.53 0.3029
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 78,605 2,318 3.04 72,758 -3.66 0.3579
2025-08-11 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 76,287 5,123 7.20 75,519 12.20 0.4067
2025-05-05 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 71,164 1,469 2.11 67,306 5.40 0.4071
2025-02-03 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 69,695 4,315 6.60 63,859 10.18 0.3595
2024-10-22 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 65,380 956 1.48 57,960 5.84 0.3599
2024-08-05 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 64,424 4,452 7.42 54,760 24.63 0.3674
2024-04-30 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 59,972 3,913 6.98 43,937 18.74 0.3157
2024-02-06 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 56,059 2,473 4.62 37,004 22.23 0.2877
2023-11-03 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 53,586 2,837 5.59 30,274 9.53 0.2705
2023-08-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 50,749 1,506 3.06 27,641 12.97 0.2403
2023-05-10 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 49,243 2,471 5.28 24,467 306.70 0.2337
2023-01-18 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 46,772 -1,635 -3.38 6,017 -73.68 0.3029
2022-10-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 48,407 -5,587 -10.35 22,861 -11.66 0.2628
2022-07-13 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 53,994 2,141 4.13 25,878 -13.34 0.2308
2022-05-12 2022-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 51,853 2,472 5.01 29,860 6.51 0.2287
2022-05-10 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 49,381 0 28,035 0.2107
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 49,381 -12,706 -20.46 28,035 0.48 0.2103
2021-10-14 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 62,087 19,236 44.89 27,900 64.56 0.1774
2021-08-12 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 42,851 5,540 14.85 16,954 28.93 0.1481
2021-04-22 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 37,311 3,784 11.29 13,150 4.10 0.1254
2021-04-01 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 33,527 1,913 6.05 12,632 18.30 0.1316
2020-11-02 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 31,614 1,423 4.71 10,678 17.41 0.1388
2020-08-17 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 30,191 1,697 5.96 9,095 13.12 0.1263
2020-05-12 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 28,494 -2,918 -9.29 8,040 -12.92 0.1476
2020-02-10 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 31,412 -1,048 -3.23 9,233 -1.63 0.1435
2019-11-13 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 32,460 -20,744 -38.99 9,386 -33.14 0.1459
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 53,204 26,947 102.63 14,038 121.14 0.2538
2019-05-13 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 26,257 -383 -1.44 6,348 16.97 0.1253
2019-02-08 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 26,640 -806 -2.94 5,427 -15.81 0.1308
2018-11-01 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 27,446 10,881 65.69 6,446 87.00 0.1321
2018-08-09 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 16,565 6,469 64.07 3,447 81.14 0.0565
2018-05-09 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 10,096 -5,891 -36.85 1,903 -36.76 0.0745
2018-02-07 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 15,987 -8,736 -35.34 3,009 -21.52 0.1271
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 24,723 -1,391 -5.33 3,834 -2.79 0.0948
2017-08-10 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 26,114 1,827 7.52 3,944 -2.76 0.1067
2017-05-10 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 24,287 3,803 18.57 4,056 22.61 0.1134
2017-02-09 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 20,484 -2,332 -10.22 3,308 -3.67 0.1084
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 22,816 -2,404 -9.53 3,434 -12.73 0.1400
2016-08-09 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 25,220 2,355 10.30 3,935 11.92 0.1590
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 22,865 -4,774 -17.27 3,516 -21.24 0.1699
2016-02-09 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 27,639 8,736 46.21 4,464 63.34 0.2141
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 18,903 -8,398 -30.76 2,733 -25.89 0.1503
2015-08-13 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 27,301 7,356 36.88 3,688 22.04 0.1750
2015-05-13 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 19,945 7,486 60.09 3,022 71.12 0.1742
2015-02-17 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 12,459 5,241 72.61 1,766 95.14 0.1137
2014-11-12 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 7,218 2,274 46.00 905 59.05 0.0626
2014-08-08 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 4,944 1,031 26.35 569 30.21 0.0489
2014-05-15 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 3,913 -5,578 -58.77 437 -61.33 0.0461
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 9,491 9,491 1,130 0.1262
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
(%)
2015-05-13 2015-03-31 13F COSTCO WHSL CORP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-02-17 2014-12-31 13F COSTCO WHSL CORP COM Call 600 0.00 9 n/a n/a n/a
2014-11-12 2014-09-30 13F COSTCO WHSL CORP COM Call 600 0.00 0 -100.00 n/a n/a n/a
2014-08-08 2014-06-30 13F COSTCO WHSL CORP COM Call 600 1 n/a n/a n/a
Disclosed Put 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
(%)
2025-08-11 2025-06-30 13F COSTCO WHSL CORP COM Put 0 2 n/a n/a n/a
2021-04-21 2021-03-31 13F COSTCO WHSL CORP COM Put 0 -100.00 0 n/a n/a n/a
2021-04-01 2020-12-31 13F COSTCO WHSL CORP COM Put 100 0 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.