(Reuters) - Billionaire George Soros' investment firm, Soros Fund Management Llc, raised its stake in Tesla Inc's convertible bonds due in 2021 by 17.5 million convertible bonds to 37.5 million convertible bonds as of the end of the first quarter, according to a filing with the U.S. Securities and Exchange Commission late Wednesday. Soros' increase in the 1.250% convertible bonds follows the firm's purchase last year of another Tesla convertible bond that came due in March The post Soros Fund Management increases stake in Tesla convertible bonds – filings appeared first on Firstpost.