BlackRock Inc. (NYSE:BLK) posted a stronger-than-expected third-quarter performance, fueled by rising performance fees and solid margin expansion, with assets under management climbing to $13.5 trillion.The firm’s robust organic base fee growth and favorable revenue mix underscore its ability to drive operating leverage, positioning it for continued momentum into year-end.Following the results, Goldman Sachs analyst Alexander Blostein reiterated a buy rating with a price forecast of$1,312.Also Read: BlackR ...