(Bloomberg) — Jim Simons's $32 billion Renaissance Technologies and Andreas Halvorsen's Viking Global Investors posted gains in July as the hedge fund industry extended its rebound from the worst start to a year on record.

Renaissance's Institutional Equities Fund, a quantitative strategy that has been among the top performers this year, rose 3.1%, boosting its year-to-date return to 17%, according to a person familiar with the matter. Viking Global, the $30 billion hedge fund that wagers on and against stocks, gained 3% in July, paring this year's losses to 3.1%.

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