BlackRock (NYSE: BLK) stock jumps 6% after smashing Q2 estimates with record AUM, revenue growth, and a $2B buyback boost.

BlackRock (NYSE: BLK) stock rallies premarket after Q2 earnings smash Wall Street estimates on record inflows and $15.3T AUM. Read more.

In a remarkable show of strength, BlackRock announced impressive second-quarter profits that outpaced Wall Street's forecasts. Driven by a buoyant stock market, client assets…