Hedge fund Tiger Global Management is making a big bet on continued expansion at San-Francisco-based Sunrun, which has grown into the nation's largest residential solar company. The fund, headed by Julian Robertson protégé Chase Coleman, has been steadily increasing its position in Sunrun since at least the first quarter of 2018. The firm now owns 29.7 million shares, or more than 25% of Sunrun's equity, according to recent filings with the Securities and Exchange Commission. Coleman was one of the so-called "tiger cubs" who started his investing career at Tiger Management under legendary investor Julian Robertson.