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Travis Kelce is channeling his inner kid with his latest business move -- the Kansas City Chiefs superstar loves roller coasters so much, he invested in Six Flags!!

Taylor Swift 's fiancé revealed the news on Tuesday ... saying, it was an opportunity he had to pounce on due to his family's countless trips to Cedar Point amusement park in Sandusky, Ohio growing up.

Kelce -- who grew up in northeast Ohio -- teamed up with JANA Partners to get a piece of Six Flags ... which merged with CP's parent company, Cedar Fair, in 2024.

The investment group -- also including former GAP CEO Glenn Murphy and Reddit honcho Dave Habiger -- now has approximately 9% of Six Flags Entertainment Corporation.

For those who don't know their wood and steel, Cedar Point is widely regarded as one of the

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