Billionaire George Soros, a major Hillary Clinton supporter, lost close to $1 billion in trades by betting stocks would collapse after Donald Trump’s stunning victory in November, it was reported Thursday.

Instead, the Dow Jones Industrial Average has soared 9.3 percent.

The lefty hedge-fund manager – who donated millions to Clinton and returned to last year to managing his $30 million Soros Fund Management LLC — placed bearish bets because he thought the economy was headed south after Trump’s election, according to the Wall Street Journal.

The paper said Soros’ fund still managed to gain 5 percent on the year – but that was half the 10 percent gain registered in a fund run by his former deputy Stanley Druckenmiller, who correctly predicted that stocks would first tumble then spike if Trump won.