May 19 (UPI) -- Prominent U.S. investor Stanley Druckenmiller sharply increased his exposure to Argentina in the first quarter of 2026, purchasing nearly $150 million in shares of YPF, signaling renewed Wall Street interest in Argentina's energy sector. According to filings by his firm, Duquesne Family Office, with the U.S. Securities and Exchange Commission, Druckenmiller increased his stake in YPF by 433%, to more than 3.2 million shares from 606,990. The state-controlled oil company has