Entities affiliated with Slim exercised the warrants he bought in 2009 when he loaned the company $250 million during the height of the financial crisis.
New York Times, controlled by the Ochs-Sulzberger family through Class B shares, paid back the loan in 2011.
Slim's total stake is valued at $341.4 million, based on the stock's Wednesday closing price of $12.28.
He follows other billionaires who have put their faith in the media business. Amazon.com Inc (AMZN.O) founder Jeff Bezos bought the Washington Post in 2013 while Warren Buffett has invested in several newspapers . . .
