This ETF is drawing its strong returns from tech powerhouses like Nvidia, Broadcom, and Palantir.BlackRock is the world's largest asset manager, with $13.5 trillion in client funds in its custody. Around$5 trillion of that total is spread across over 1,600 exchange-traded funds (ETFs) managed by the company's iShares subsidiary. One of them is the iShares Expanded Tech Sector ETF (IGM 0.97%), which has a concentrated portfolio of technology stocks that includes many of the giants leading the artificial int ...