Billionaire investor George Soros increased a stake in the SPDR Gold Trust, an exchange-traded fund backed by the precious metal, during the third quarter, according to a government filing.

Soros Fund Management LLC held 48,350 in the SPDR Gold Trust as of Sept. 30, compared with 42,800 shares at the end of the second quarter, a filing today with the U.S. Securities and Exchange Commission showed.

SPDR is the biggest exchange-traded product backed by gold.