Billionaire Ken Griffin Once Said 'If You Don't Like to Sell, Get Over It' - Here's What That Means for Traders Today

Most recently, billionaire investor Ken Griffin has been in the headlines because his Citadel hedge fund extended a lifeline to help save Leopold Aschenbrenner's Situational Awareness.

Some market-watchers seem surprised that Aschenbrenner is already back to making big bets for Situational Awareness, but Griffin is probably not one of them.

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During a 2025 appearance on the Founders Podcast, the Citadel boss characterized taking losses and selling as a necessary part of the business.

"You're always selling," said Griffin. "And if you don't like to sell, here's my advice: Get over it."

His admonition sounds simple, but that terse "get over it" represents one of the most psychologically demanding principles in active money management: the discipline to cut positions, take profits, or exit losing trades without emotional attachment.