MGM Resorts International
MX ˙ BMV ˙ US5529531015
SecurityMX:MGM / MGM Resorts International
InstitutionCss Llc/il
Latest Disclosed Ownership14,754 shares
Latest Disclosed Value $ 546,046
Css Llc/il ownership in MGM / MGM Resorts International

On May 15, 2026 - Css Llc/il filed a 13F-HR form disclosing ownership of 14,754 shares of MGM Resorts International (MX:MGM) valued at $546,046 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,410 shares of MGM Resorts International. This represents a change in shares of 234.56% during the quarter.

Css Llc/il has a history of taking positions in derivatives of the underlying security (MGM) 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 $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: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 14,754 10,344 234.56 546 241.25 0.0262
2026-02-17 2025-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 4,410 4,410 161 0.0072
2020-08-14 2020-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 0 -43,089 -100.00 0 -100.00
2020-05-15 2020-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 43,089 43,089 508 0.0401
2014-11-14 2014-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 0 -19,489 -100.00 0 -100.00
2014-08-14 2014-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 19,489 -36,502 -65.19 515 -60.90 0.0214
2014-02-14 2013-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 55,991 55,991 1,317 0.0632
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
(%)
2026-05-15 2026-03-31 13F MGM RESORTS INTERNATIONAL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F MGM RESORTS INTERNATIONAL COM Call 10,000 365 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
(%)
2020-08-14 2020-06-30 13F MGM RESORTS INTERNATIONAL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-15 2020-03-31 13F MGM RESORTS INTERNATIONAL COM Put 40,200 474 n/a n/a n/a
2017-11-14 2017-09-30 13F MGM RESORTS INTERNATIONAL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-08-14 2017-06-30 13F MGM RESORTS INTERNATIONAL COM Put 40,000 99.00 1,252 127.22 n/a n/a n/a
2017-05-15 2017-03-31 13F MGM RESORTS INTERNATIONAL COM Put 20,100 -94.16 551 -94.44 n/a n/a n/a
2017-02-14 2016-12-31 13F MGM RESORTS INTERNATIONAL COM Put 344,000 -3.15 9,917 7.26 n/a n/a n/a
2016-11-14 2016-09-30 13F MGM RESORTS INTERNATIONAL COM Put 355,200 914.86 9,246 1,067.42 n/a n/a n/a
2016-08-15 2016-06-30 13F MGM RESORTS INTERNATIONAL COM Put 35,000 0.00 792 n/a n/a n/a
2015-08-14 2015-06-30 13F MGM RESORTS INTERNATIONAL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2015-05-15 2015-03-31 13F MGM RESORTS INTERNATIONAL COM Put 60,000 -49.87 1,262 -50.68 n/a n/a n/a
2015-02-17 2014-12-31 13F MGM RESORTS INTERNATIONAL COM Put 119,700 71.74 2,559 61.25 n/a n/a n/a
2014-11-14 2014-09-30 13F MGM RESORTS INTERNATIONAL COM Put 69,700 0.00 1,587 -13.75 n/a n/a n/a
2014-08-14 2014-06-30 13F MGM RESORTS INTERNATIONAL COM Put 69,700 47.36 1,840 50.45 n/a n/a n/a
2014-05-15 2014-03-31 13F MGM RESORTS INTERNATIONAL COM Put 47,300 -77.79 1,223 -75.58 n/a n/a n/a
2014-02-14 2013-12-31 13F MGM RESORTS INTERNATIONAL PUT Put 213,000 5,009 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.