MGM Resorts International
MX ˙ BMV ˙ US5529531015
SecurityMX:MGM / MGM Resorts International
InstitutionWhitebox Advisors Llc
Latest Disclosed Ownership186,869 shares
Latest Disclosed Value $ 6,916,022
Whitebox Advisors Llc ownership in MGM / MGM Resorts International

On May 15, 2026 - Whitebox Advisors Llc filed a 13F-HR form disclosing ownership of 186,869 shares of MGM Resorts International (MX:MGM) valued at $6,916,022 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 286,050 shares of MGM Resorts International. This represents a change in shares of -34.67% during the quarter.

Whitebox Advisors Llc has a history of taking positions in derivatives of the underlying security (MGM) in the form of stock options.

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:MGM / MGM Resorts International 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)
2026-05-15 2026-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 186,869 -99,181 -34.67 6,916 -33.74 0.0851
2026-02-17 2025-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 286,050 71,889 33.57 10,438 40.62 0.1481
2025-11-14 2025-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 214,161 52,831 32.75 7,423 33.78 0.1148
2025-08-14 2025-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 161,330 147,059 1,030.47 5,548 1,214.69 0.1178
2025-05-15 2025-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 14,271 6,359 80.37 423 54.01 0.0109
2025-02-14 2024-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 7,912 250 3.26 274 -8.36 0.0079
2024-11-14 2024-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 7,662 7,662 300 0.0082
2021-02-16 2020-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 0 -32,514 -100.00 0 -100.00
2020-11-13 2020-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 32,514 -22,000 -40.36 707 -22.82 0.0293
2020-08-14 2020-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 54,514 40,000 275.60 916 435.67 0.0509
2020-05-15 2020-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 14,514 14,514 171 0.0087
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
(%)
2017-05-15 2017-03-31 13F MGM RESORTS INTERNATIONAL PUT Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-01-30 2016-12-31 13F MGM RESORTS INTERNATIONAL PUT Put 200,000 0.00 5,766 10.76 n/a n/a n/a
2016-11-01 2016-09-30 13F MGM RESORTS INTERNATIONAL PUT Put 200,000 0.00 5,206 15.02 n/a n/a n/a
2016-07-27 2016-06-30 13F MGM RESORTS INTERNATIONAL PUT Put 200,000 4,526 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.