Six Flags Entertainment
Operates regional amusement parks, water parks, and resorts across North America.
$16.39
After-hours close+0.16 (+0.99%)
At close$16.23(+1.69%)
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Breakdown13F · Form 4
Institutions 110.62%Insiders 12.58%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 102.20M · Float —
Float — provider float is below the insider stake.
The provider's float is smaller than the insider stake it should exclude, so it is not shown.
Institutions13F, as of Jun 30, 2026
333 holders · 113.06M shares · 56 new positions · 155 increased · 81 reduced · 41 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 15.92M | 15.57% | +756.4K | Aug 7, 2026 |
| Darlington Partners Capital Management, LP | 7.70M | 7.53% | −1.00M | Aug 14, 2026 |
| Morgan Stanley | 6.06M | 5.93% | +136.4K | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 5.43M | 5.31% | +289.0K | Aug 13, 2026 |
| Sachem Head Capital Management LP | 5.03M | 4.92% | 0 | Aug 14, 2026 |
| Dendur Capital LP | 4.95M | 4.85% | 0 | Aug 14, 2026 |
| H Partners Management, LLC | 4.90M | 4.79% | +250.0K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 4.27M | 4.18% | +60.5K | Aug 13, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Darlington Partners Capital Management, LP | 8.50% | 8.70M | 13G | May 15, 2026 ↗ |
| Morgan Stanley | 5.40% | 5.51M | 13G | May 12, 2026 ↗ |
| Vanguard Portfolio Management | 5.11% | 5.21M | 13G | Apr 29, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Jonathan A. Brudnick | director | 5.03M | 4.92% | Oct 27, 2025 |
| Rehan Jaffer | director | 4.90M | 4.79% | Jun 16, 2026 |
| Richard Zimmerman | director, officer: President & CEO | 602.7K | 0.59% | Dec 9, 2025 |
| Selim A. Bassoul | director, officer: Executive Chairman | 537.2K | 0.53% | Jan 5, 2026 |
| Brian C. Witherow | officer: Chief Financial Officer | 300.2K | 0.29% | Feb 25, 2026 |
| John T. Reilly | director, officer: President & CEO | 297.7K | 0.29% | Aug 12, 2026 |
| Richard M. Haddrill | director, officer: Executive Chair | 230.1K | 0.23% | May 14, 2026 |
| Tim Fisher | officer: Chief Operating Officer | 222.2K | 0.22% | Feb 25, 2026 |
| David R. Hoffman | officer: Chief Accounting Officer | 115.2K | 0.11% | Jul 31, 2026 |
| Ashok Walia | officer: Chief Financial Officer | 107.3K | 0.11% | Jul 31, 2026 |
1 person has not refiled in the last 18 months (12.9K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 12, 2026 | John T. Reillydirector, officer: President & CEO | Purchase | 15,713 | $15.80 | 297,736 |
| Jun 12, 2026 | Rehan Jafferdirector | Purchase | 125,000 | $23.69 | 4,775,000 |
| Jun 15, 2026 | Rehan Jafferdirector | Purchase | 125,000 | $23.41 | 4,900,000 |
| May 21, 2026 | Marilyn G. Spiegeldirector | Purchase | 2,500 | $19.10 | 15,161 |
| May 12, 2026 | Richard M. Haddrilldirector, officer: Executive Chair | Purchase | 10,000 | $19.08 | 230,117 |
| May 12, 2026 | Marilyn G. Spiegeldirector | Purchase | 2,500 | $19.13 | 12,661 |
CongressHouse and Senate disclosures
Not reported.