---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-124392"
form_type: "8-K"
ticker: "FUN"
cik: "0001999001"
company_name: "Six Flags Entertainment Corporation/NEW"
filed_at: "2026-03-25T23:59:59+00:00"
generated_at: "2026-05-15T09:05:53.943004+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Six Flags appoints Richard Haddrill as Executive Chairman; board expands to 11

## Summary
- Richard Haddrill appointed Executive Chair, effective March 24, 2026; Marilyn Spiegel named Lead Independent Director.
- Haddrill brings experience as former Executive Vice Chairman of Scientific Games and CEO of Bally Technologies.
- Employment agreement: three-year term, $500,000 base salary, one-time equity grant of 217,797 RSA and 373,367 PSU.
- Seven new directors added to board since summer 2025; board temporarily expands to 11 members.
- Jennifer Mason will not stand for re-election at 2026 annual meeting, reducing board to 10.

## SEC filing metadata
- accession: 0001193125-26-124392
- form_type: 8-K
- ticker: FUN
- cik: 0001999001
- company_name: Six Flags Entertainment Corporation/NEW
- filed_at: 2026-03-25T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1999001/000119312526124392/0001193125-26-124392-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1999001/000119312526124392/d20705d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-124392
- JSON: https://secwatch.observer/filing/0001193125-26-124392.json
- Plain text: https://secwatch.observer/filing/0001193125-26-124392.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.