Six Flags Entertainment Corporation: which funds bought and sold

Institutions that bought and sold Six Flags Entertainment shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 146 institutions that filed 13F reports for both quarters added to or opened positions in Six Flags Entertainment, and 112 cut or closed them. Together they sold a net 9.3M shares, −8.2% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 4.8M shares (−12.7%); index fund managers were net buyers of 1.6M shares (+4.8%). 52 opened a new position and 33 sold out entirely.

Bought, Q2 2026 146 institutions, 52 of them new holders Sold, Q2 2026 112 institutions, 33 of them sold out

Net change, all compared −9.3M shares (−8.2%)

Net change, active managers −4.8M shares (−12.7%), 22 bought, 25 sold

Buyers versus sellers

institutions compared, 336

146 bought 78 112 sold

Active managers and hedge funds 22 bought · 25 sold · −4.8M

Index fund managers 8 bought · 2 sold · +1.6M

Other institutions 116 bought · 85 sold · −6.2M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Healthcare Of Ontario Pension Plan Trust Fund	+1.6M +156.3%	2.6M	$55.7M
Blackrock, Inc. Index funds	+756K +5.0%	15.9M	$339M
Marshall Wace, LLP Hedge fund	+501K +32.9%	2.0M	$43.1M
Vanguard Portfolio Management LLC Index funds	+289K +5.6%	5.4M	$116M
H Partners Management, LLC	+250K +5.4%	4.9M	$104M
AQR Capital Management LLC Hedge fund	+233K New position	233K	$5M
Manatuck Hill Partners, LLC	+230K +287.5%	310K	$6.6M
Long Pond Capital, LP	+229K +30.5%	979K	$20.9M
Nuveen, LLC	+221K +106.9%	428K	$9.1M
Dimensional Fund Advisors LP	+203K +1038.4%	222K	$4.7M
Y-Intercept (Hong Kong) Ltd	+197K New position	197K	$4.2M
State Street Corp Index funds	+194K +5.3%	3.9M	$82.6M
Walleye Capital LLC Hedge fund	+192K +145.0%	325K	$6.9M
Jump Financial, LLC	+151K +380.9%	191K	$4.1M
Geode Capital Management, LLC Index funds	+142K +6.0%	2.5M	$53.3M
Morgan Stanley	+136K +2.3%	6.1M	$129M
Walleye Trading LLC	+110K New position	110K	$2.4M
Northern Trust Corp Index funds	+109K +10.7%	1.1M	$24.2M
Fil Ltd Active manager	+105K +24.7%	530K	$11.3M
Contrarian Capital Management, L.L.C.	+100K New position	100K	$2.1M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Marshall Wace, LLP Hedge fund	+501K +32.9%	2.0M	$43.1M
AQR Capital Management LLC Hedge fund	+233K New position	233K	$5M
Walleye Capital LLC Hedge fund	+192K +145.0%	325K	$6.9M
Fil Ltd Active manager	+105K +24.7%	530K	$11.3M
Verition Fund Management LLC Hedge fund	+100K New position	100K	$2.1M
American Century Companies Inc Active manager	+85K +435.5%	105K	$2.2M
Woodline Partners LP Hedge fund	+59K New position	59K	$1.2M
Gotham Asset Management, LLC Hedge fund	+58K New position	58K	$1.2M
Schonfeld Strategic Advisors LLC Hedge fund	+58K +387.8%	73K	$1.5M
Point72 Asset Management, L.P. Hedge fund	+50K New position	50K	$1.1M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
UBS Group AG	−5.2M −57.4%	3.9M	$82.7M
Ameriprise Financial Inc	−1.8M −51.6%	1.6M	$35.1M
Hawk Ridge Capital Management LP Hedge fund	−1.4M Sold out	0	—
Darlington Partners Capital Management, LP Hedge fund	−1.0M −11.5%	7.7M	$164M
Invenomic Capital Management LP Hedge fund	−995K −69.8%	431K	$9.2M
Land & Buildings Investment Management, LLC Hedge fund	−642K Sold out	0	—
Citadel Advisors LLC Hedge fund	−642K −36.9%	1.1M	$23.4M
Goldman Sachs Group Inc	−640K −21.5%	2.3M	$49.8M
Jpmorgan Chase & Co	−563K −88.5%	73K	$1.6M
Channing Capital Management, LLC	−511K Sold out	0	—
Rush Island Management, LP Hedge fund	−509K −54.8%	419K	$8.9M
Bank Of America Corp	−224K −34.5%	426K	$9.1M
Darwins River Capital, LP	−206K Sold out	0	—
Glenview Capital Management, LLC Hedge fund	−205K −9.2%	2.0M	$43M
Susquehanna Advisors Group, Inc.	−198K −90.6%	21K	$438,098
Balyasny Asset Management L.P. Hedge fund	−180K −21.2%	669K	$14.3M
Thompson Siegel & Walmsley LLC	−166K −47.5%	184K	$3.9M
Jane Street Group, LLC	−162K Sold out	0	—
Millennium Management LLC Hedge fund	−158K −57.6%	116K	$2.5M
Creek Drive Management Group LLC	−155K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Hawk Ridge Capital Management LP Hedge fund	−1.4M Sold out	0	—
Darlington Partners Capital Management, LP Hedge fund	−1.0M −11.5%	7.7M	$164M
Invenomic Capital Management LP Hedge fund	−995K −69.8%	431K	$9.2M
Land & Buildings Investment Management, LLC Hedge fund	−642K Sold out	0	—
Citadel Advisors LLC Hedge fund	−642K −36.9%	1.1M	$23.4M
Rush Island Management, LP Hedge fund	−509K −54.8%	419K	$8.9M
Glenview Capital Management, LLC Hedge fund	−205K −9.2%	2.0M	$43M
Balyasny Asset Management L.P. Hedge fund	−180K −21.2%	669K	$14.3M
Millennium Management LLC Hedge fund	−158K −57.6%	116K	$2.5M
Saba Capital Management, L.P. Hedge fund	−113K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
AQR Capital Management LLCHedge fund	233K	$5M
Y-Intercept (Hong Kong) Ltd	197K	$4.2M
Walleye Trading LLC	110K	$2.4M
Contrarian Capital Management, L.L.C.	100K	$2.1M
Verition Fund Management LLCHedge fund	100K	$2.1M
Occudo Quantitative Strategies LP	95K	$2M
Bw Gestao De Investimentos Ltda.	75K	$1.6M
Qsemble Capital Management, LP	71K	$1.5M
Woodline Partners LPHedge fund	59K	$1.2M
Gotham Asset Management, LLCHedge fund	58K	$1.2M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Hawk Ridge Capital Management LPHedge fund	1.4M	$24.3M
Land & Buildings Investment Management, LLCHedge fund	642K	$11.4M
Channing Capital Management, LLC	511K	$9.1M
Darwins River Capital, LP	206K	$3.6M
Jane Street Group, LLC	162K	$2.9M
Creek Drive Management Group LLC	155K	$2.8M
Tejara Capital Ltd	141K	$2.5M
Saba Capital Management, L.P.Hedge fund	113K	$2M
Bridgewater Associates, LPHedge fund	103K	$1.8M
First Trust Advisors LP	80K	$1.4M

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 308
Ten largest holders: 58.6%
Index fund managers: 33.5%
Active managers and hedge funds: 30.8%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	22	25	9	7	−4.8M	−12.7%
Index fund managers	8	2	0	0	+1.6M	+4.8%
Other institutions	116	85	43	26	−6.2M	−14.6%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Six Flags Entertainment.

Only managers that filed a holdings report for both quarters are compared (336 here). 13 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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