The sweetened offer was not in Cedar Fair's "best interest", the company said on Wednesday, sending its shares down about 6% to $58.

Cedar Fair Chief Executive Officer Richard Zimmerman said the company had first received a $60-per-share offer, which SeaWorld later informally raised to $63. Cedar Fair then rejected the revised bid, which had valued it at $3.58 billion.

SeaWorld, a Florida-based theme park and entertainment company, had earlier this month offered to buy Cedar Fair for $3.4 billion in cash, according to a person familiar with the matter.

At the time, Sandusky, Ohio-based Cedar Fair confirmed it had received an unsolicited proposal but did not disclose the offer price.

In 2019, Cedar Fair rejected a takeover offer of $4 billion, or about $70 per share, from larger peer Six Flags Entertainment Corp.

Separately, Cedar Fair on Wednesday reported fourth-quarter revenue of $350.9 million, surpassing analysts' average expectation of $301 million, according to Refinitiv IBES data, as more people returned to its parks.

(Reporting by Anirudh Saligrama, Ann Maria Shibu and Ananya Mariam Rajesh in Bengaluru; Editing by Sherry Jacob-Phillips, Edwina Gibbs and Devika Syamnath)