MGM Resorts International
MX ˙ BMV ˙ US5529531015
SecurityMX:MGM / MGM Resorts International
InstitutionCastleKnight Management LP
Latest Disclosed Ownership107,800 shares
Latest Disclosed Value $ 3,989,678
CastleKnight Management LP ownership in MGM / MGM Resorts International

On May 15, 2026 - CastleKnight Management LP filed a 13F-HR form disclosing ownership of 107,800 shares of MGM Resorts International (MX:MGM) valued at $3,989,678 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 107,800 shares of MGM Resorts International. This represents a change in shares of 0.00% during the quarter.

CastleKnight Management LP 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 .

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.

Upgrade to unlock premium data and export to Excel .

Institutional Put/Call Ratios
(Premium Subscription Required)

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 107,800 0 0.00 3,990 1.42 0.0665
2026-02-17 2025-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 107,800 0 0.00 3,934 5.27 0.0871
2025-11-14 2025-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 107,800 0 0.00 3,736 0.78 0.0736
2025-08-14 2025-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 107,800 -60,500 -35.95 3,707 -25.68 0.1047
2025-05-15 2025-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 168,300 21,300 14.49 4,988 -2.06 0.1958
2025-02-14 2024-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 147,000 0 0.00 5,094 -11.36 0.1488
2024-11-14 2024-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 147,000 54,400 58.75 5,746 39.64 0.2368
2024-08-14 2024-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 92,600 54,800 144.97 4,115 130.66 0.2043
2024-05-15 2024-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 37,800 14,800 64.35 1,785 73.71 0.1065
2024-02-14 2023-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 23,000 13,200 134.69 1,028 185.28 0.0542
2023-11-14 2023-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 9,800 9,800 360 0.0236
2023-02-14 2022-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 0 -20,400 -100.00 0 -100.00
2022-11-14 2022-09-30 13F MGM RESORTS INTERNATIONAL COM 552953101 20,400 0 0.00 606 2.54 0.0850
2022-08-15 2022-06-30 13F MGM RESORTS INTERNATIONAL COM 552953101 20,400 4,900 31.61 591 -9.08 0.0977
2022-05-16 2022-03-31 13F MGM RESORTS INTERNATIONAL COM 552953101 15,500 1,400 9.93 650 2.69 0.0927
2022-02-14 2021-12-31 13F MGM RESORTS INTERNATIONAL COM 552953101 14,100 14,100 633 0.1306
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
(%)
2025-05-15 2025-03-31 13F MGM RESORTS INTERNATIONAL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-14 2024-12-31 13F MGM RESORTS INTERNATIONAL COM Call 200,000 0.00 6,930 -11.36 n/a n/a n/a
2024-11-14 2024-09-30 13F MGM RESORTS INTERNATIONAL COM Call 200,000 566.67 7,818 486.50 n/a n/a n/a
2024-08-14 2024-06-30 13F MGM RESORTS INTERNATIONAL COM Call 30,000 1,333 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.