Thomas Frist Jr. does not seem to have lost faith in the company he co-founded in 1968.

The HCA Healthcare co-founder, who served as chairman and CEO before retiring, bought on Monday nearly 90,000 shares in the company, growing his direct holdings by more than 22 percent, according to regulatory filings. He purchased the shares for a range of average prices between $209.73 per share and $215.29 per share.

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