George Soros’s $28 billion family office boosted its stake in YPF SA, making Argentina’s largest oil company its biggest U.S.-traded stock holding in the second quarter.

Soros Fund Management LLC added 8.47 million shares of YPF, according to a regulatory filing Thursday, bringing its total position to 3.5 percent of the company’s American depositary receipts. The position was worth $450 million at the end of June, making Soros the fourth biggest holder. Perry Capital, the $10.9 billion hedge-fund firm run by Richard Perry, and Dan Loeb’s Third Point LLC also added significantly to YPF in the second quarter.

New York-based Soros also trimmed its holding in Israeli drugmaker Teva Pharmaceutical Industries Ltd. by almost one-third. Soros still owned a stake valued at $381 million at the end of the quarter. Teva had been Soros’s largest holding.

Soros exited a stake in Monster Beverage Corp. that was previously valued at $101.6 million. Coca-Cola Co. said Thursday it would buy a 16.7 percent stake in Monster, sending the shares up more than 20 percent after the market close.