Six Flags Entertainment Corporation
US ˙ NYSE

SecurityFUN / Six Flags Entertainment Corporation
InstitutionSimplex Trading, Llc
Latest Disclosed Ownership28,935 shares
Latest Disclosed Value $ 513,596
Simplex Trading, Llc ownership in FUN / Six Flags Entertainment Corporation

On May 14, 2026 - Simplex Trading, Llc filed a 13F-HR form disclosing ownership of 28,935 shares of Six Flags Entertainment Corporation (US:FUN) valued at $513,596 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 0 shares of Six Flags Entertainment Corporation. The current value of the position is $587,091 USD.

Simplex Trading, Llc has a history of taking positions in derivatives of the underlying security (FUN) 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.

FUN / Six Flags Entertainment 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)
2026-05-14 2026-03-31 13F SIX FLAGS ENTERTAINMENT COM 83001C108 28,935 28,935 514 0.0002
2026-02-11 2025-12-31 13F SIX FLAGS ENTERTAINMENT COM 83001C108 0 -132,216 -100.00 0 -100.00
2025-11-12 2025-09-30 13F SIX FLAGS ENTERTAINMENT COM 83001C108 132,216 128,185 3,179.98 3 0.0015
2025-08-05 2025-06-30 13F SIX FLAGS ENTERTAINMENT COM 83001C108 4,031 3,120 342.48 0 0.0001
2025-05-12 2025-03-31 13F SIX FLAGS ENTERTAINMENT COM 83001C108 911 -1,383 -60.29 0 0.0000
2025-02-11 2024-12-31 13F SIX FLAGS ENTERTAINMENT COM 83001C108 2,294 -1,248 -35.23 0 0.0001
2024-11-08 2024-09-30 13F SIX FLAGS ENTERTAINMENT COM 83001C108 3,542 3,542 0 0.0001
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
(%)
2024-04-25 2024-03-31 13F CEDAR FAIR L P CALL Call 0 -100.00 0 n/a n/a n/a
2024-02-02 2023-12-31 13F CEDAR FAIR L P CALL Call 1,100 -35.29 0 n/a n/a n/a
2023-11-01 2023-09-30 13F CEDAR FAIR L P CALL Call 1,700 -5.56 0 n/a n/a n/a
2023-08-04 2023-06-30 13F CEDAR FAIR L P CALL Call 1,800 -71.88 0 n/a n/a n/a
2023-04-27 2023-03-31 13F CEDAR FAIR L P CALL Call 6,400 392.31 0 n/a n/a n/a
2023-02-02 2022-12-31 13F CEDAR FAIR L P CALL Call 1,300 0.00 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F CEDAR FAIR L P CALL Call 1,300 -7.14 53 -13.11 n/a n/a n/a
2022-08-03 2022-06-30 13F CEDAR FAIR L P CALL Call 1,400 -83.72 61 -87.05 n/a n/a n/a
2022-05-02 2022-03-31 13F CEDAR FAIR L P CALL Call 8,600 -89.77 471 -88.81 n/a n/a n/a
2022-02-23 2021-12-31 13F/A CEDAR FAIR L P CALL Call 84,100 -47.24 4,210 -41.71 n/a n/a n/a
2022-02-04 2021-12-31 13F CEDAR FAIR L P CALL Call 159,400 7,222 n/a n/a n/a
2021-10-28 2021-09-30 13F CEDAR FAIR L P CALL Call 159,400 -0.31 7,222 0.75 n/a n/a n/a
2021-08-12 2021-06-30 13F CEDAR FAIR L P CALL Call 159,900 11,089.64 7,168 0.97 n/a n/a n/a
2021-04-26 2021-03-31 13F CEDAR FAIR L P CALL Call 1,429 51.06 7,099 90.78 n/a n/a n/a
2021-02-02 2020-12-31 13F CEDAR FAIR L P CALL Call 946 196.55 3,721 315.75 n/a n/a n/a
2020-10-14 2020-09-30 13F CEDAR FAIR L P CALL Call 319 3.24 895 5.42 n/a n/a n/a
2020-07-13 2020-06-30 13F CEDAR FAIR L P CALL Call 309 329.17 849 543.18 n/a n/a n/a
2020-04-29 2020-03-31 13F CEDAR FAIR L P CALL Call 72 14.29 132 -62.18 n/a n/a n/a
2020-02-05 2019-12-31 13F CEDAR FAIR L P CALL Call 63 -73.31 349 -74.66 n/a n/a n/a
2019-10-15 2019-09-30 13F CEDAR FAIR L P CALL Call 236 2,850.00 1,377 3,523.68 n/a n/a n/a
2019-07-26 2019-06-30 13F CEDAR FAIR L P CALL Call 8 -75.00 38 -77.38 n/a n/a n/a
2019-04-18 2019-03-31 13F CEDAR FAIR L P CALL Call 32 -85.90 168 -84.34 n/a n/a n/a
2019-01-16 2018-12-31 13F CEDAR FAIR L P CALL Call 227 37.58 1,073 24.91 n/a n/a n/a
2018-10-23 2018-09-30 13F CEDAR FAIR L P CALL Call 165 3,200.00 859 2,670.97 n/a n/a n/a
2018-07-30 2018-06-30 13F CEDAR FAIR L P CALL Call 5 -68.75 31 -96.39 n/a n/a n/a
2018-04-26 2018-03-31 13F CEDAR FAIR L P CALL Call 16 -81.40 0 -100.00 n/a n/a n/a
2018-01-10 2017-12-31 13F CEDAR FAIR L P CALL Call 86 186.67 4 100.00 n/a n/a n/a
2017-10-25 2017-09-30 13F CEDAR FAIR L P CALL Call 30 87.50 2 0.00 n/a n/a n/a
2017-07-12 2017-06-30 13F CEDAR FAIR L P CALL Call 16 -85.71 2 -88.24 n/a n/a n/a
2017-04-21 2017-03-31 13F CEDAR FAIR L P CALL Call 112 -23.81 17 -67.31 n/a n/a n/a
2017-01-11 2016-12-31 13F CEDAR FAIR L P CALL Call 147 51.55 52 1,200.00 n/a n/a n/a
2016-10-07 2016-09-30 13F CEDAR FAIR L P CALL Call 97 340.91 4 100.00 n/a n/a n/a
2016-07-18 2016-06-30 13F CEDAR FAIR L P CALL Call 22 -15.38 2 0.00 n/a n/a n/a
2016-04-14 2016-03-31 13F CEDAR FAIR L P CALL Call 26 100.00 2 0.00 n/a n/a n/a
2016-01-20 2015-12-31 13F CEDAR FAIR L P CALL Call 13 333.33 2 0.00 n/a n/a n/a
2015-10-08 2015-09-30 13F CEDAR FAIR L P CALL Call 3 0.00 0 -100.00 n/a n/a n/a
2015-07-08 2015-06-30 13F CEDAR FAIR L P CALL Call 3 50.00 0 -100.00 n/a n/a n/a
2015-04-21 2015-03-31 13F CEDAR FAIR L P CALL Call 2 -86.67 1 -83.33 n/a n/a n/a
2015-03-04 2014-12-31 13F CEDAR FAIR L P CALL Call 15 6 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
(%)
2024-11-08 2024-09-30 13F CEDAR FAIR L P PUT Put 0 -100.00 0 n/a n/a n/a
2024-07-25 2024-06-30 13F CEDAR FAIR L P PUT Put 900 0 n/a n/a n/a
2024-02-02 2023-12-31 13F CEDAR FAIR L P PUT Put 0 -100.00 0 n/a n/a n/a
2023-11-01 2023-09-30 13F CEDAR FAIR L P PUT Put 100 -93.33 0 n/a n/a n/a
2023-08-04 2023-06-30 13F CEDAR FAIR L P PUT Put 1,500 275.00 0 n/a n/a n/a
2023-04-27 2023-03-31 13F CEDAR FAIR L P PUT Put 400 -20.00 0 n/a n/a n/a
2023-02-02 2022-12-31 13F CEDAR FAIR L P PUT Put 500 0.00 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F CEDAR FAIR L P PUT Put 500 -75.00 20 -77.01 n/a n/a n/a
2022-08-03 2022-06-30 13F CEDAR FAIR L P PUT Put 2,000 100.00 87 61.11 n/a n/a n/a
2022-05-02 2022-03-31 13F CEDAR FAIR L P PUT Put 1,000 -95.76 54 -95.43 n/a n/a n/a
2022-02-23 2021-12-31 13F/A CEDAR FAIR L P PUT Put 23,600 14.01 1,181 26.04 n/a n/a n/a
2022-02-04 2021-12-31 13F CEDAR FAIR L P PUT Put 20,700 937 n/a n/a n/a
2021-10-28 2021-09-30 13F CEDAR FAIR L P PUT Put 20,700 -2.36 937 -1.37 n/a n/a n/a
2021-08-12 2021-06-30 13F CEDAR FAIR L P PUT Put 21,200 14,520.69 950 31.94 n/a n/a n/a
2021-04-26 2021-03-31 13F CEDAR FAIR L P PUT Put 145 27.19 720 60.71 n/a n/a n/a
2021-02-02 2020-12-31 13F CEDAR FAIR L P PUT Put 114 65.22 448 132.12 n/a n/a n/a
2020-10-14 2020-09-30 13F CEDAR FAIR L P PUT Put 69 -61.02 193 -60.29 n/a n/a n/a
2020-07-13 2020-06-30 13F CEDAR FAIR L P PUT Put 177 -41.00 486 -11.64 n/a n/a n/a
2020-04-29 2020-03-31 13F CEDAR FAIR L P PUT Put 300 525.00 550 106.77 n/a n/a n/a
2020-02-05 2019-12-31 13F CEDAR FAIR L P PUT Put 48 118.18 266 107.81 n/a n/a n/a
2019-10-15 2019-09-30 13F CEDAR FAIR L P PUT Put 22 -29.03 128 -12.93 n/a n/a n/a
2019-07-26 2019-06-30 13F CEDAR FAIR L P PUT Put 31 -36.73 147 -42.80 n/a n/a n/a
2019-04-18 2019-03-31 13F CEDAR FAIR L P PUT Put 49 206.25 257 242.67 n/a n/a n/a
2019-01-16 2018-12-31 13F CEDAR FAIR L P PUT Put 16 -36.00 75 -42.31 n/a n/a n/a
2018-10-23 2018-09-30 13F CEDAR FAIR L P PUT Put 25 1,150.00 130 983.33 n/a n/a n/a
2018-07-30 2018-06-30 13F CEDAR FAIR L P PUT Put 2 -77.78 12 300.00 n/a n/a n/a
2018-04-26 2018-03-31 13F CEDAR FAIR L P PUT Put 9 -18.18 3 50.00 n/a n/a n/a
2018-01-10 2017-12-31 13F CEDAR FAIR L P PUT Put 11 -67.65 2 -60.00 n/a n/a n/a
2017-10-25 2017-09-30 13F CEDAR FAIR L P PUT Put 34 -30.61 5 400.00 n/a n/a n/a
2017-07-12 2017-06-30 13F CEDAR FAIR L P PUT Put 49 19.51 1 -83.33 n/a n/a n/a
2017-04-21 2017-03-31 13F CEDAR FAIR L P PUT Put 41 20.59 6 200.00 n/a n/a n/a
2017-01-11 2016-12-31 13F CEDAR FAIR L P PUT Put 34 385.71 2 100.00 n/a n/a n/a
2016-10-07 2016-09-30 13F CEDAR FAIR L P PUT Put 7 600.00 1 -50.00 n/a n/a n/a
2016-07-18 2016-06-30 13F CEDAR FAIR L P PUT Put 1 -98.70 0 -100.00 n/a n/a n/a
2016-04-14 2016-03-31 13F CEDAR FAIR L P PUT Put 77 352.94 5 -16.67 n/a n/a n/a
2016-01-20 2015-12-31 13F CEDAR FAIR L P PUT Put 17 -5.56 6 -33.33 n/a n/a n/a
2015-10-08 2015-09-30 13F CEDAR FAIR L P PUT Put 18 1,700.00 9 50.00 n/a n/a n/a
2015-07-08 2015-06-30 13F CEDAR FAIR L P PUT Put 1 -94.44 0 -100.00 n/a n/a n/a
2015-04-21 2015-03-31 13F CEDAR FAIR L P PUT Put 0 -100.00 0 -100.00 n/a n/a n/a
2015-03-04 2014-12-31 13F CEDAR FAIR L P PUT Put 14 1 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.