Warren Buffett Reveals His Dumbest Mistake

This clip shows Warren Buffett at his most honest and self-deprecating, as he talks about what he calls the “dumbest stock” he ever bought. With his signature calm delivery and dry humor, Buffett walks through the mistake, explaining how even the greatest investors can get it wrong. The interviewer laughs as he pokes fun at himself, turning a costly lesson into a memorable—and surprisingly funny—story about humility, discipline, and learning the hard way in the stock market.

WATCH:

Warren Buffett on the dumbest stock he ever bought. pic.twitter.com/Cga1l7HIRZ

— Documenting Saylor (@saylordocs) March 31, 2026