Institutional investors are increasingly driving the stock market, with data showing their options flows are three times higher than a typical September. Vanda Research strategist Viraj Patel noted their resilience amidst spiking 10-year and 30-year U.S. Treasury yields, calling it a "constructive signal for risk appetite." Big money is selectively buying AI plays, with Meta Platforms' shares surging almost 13% last week after its Muse Charm device debut. Meanwhile, Goldman Sachs reported retail investors' share of S&P 500 trading volume has fallen more than three percentage points below its five-year average.