Institutional investors have taken back control of the stock market. The shift pushes retail traders to the sidelines and drives the S&P 500 into positive territory for the month. The benchmark index finished last week more than 1% higher. The advance holds despite pressure from rising Treasury yields. Wall Street money managers are now executing the bulk of market activity.

Big money flows have turned up over the past five sessions. This buying continues even as the 10-year and 30-year U.S. Treasury yields climb to their highest levels in more than a decade. Options activity from large investors sits three times higher than a typical September. "Institutional investors have been surprisingly resilient through this week's macro volatility," Viraj Patel, global market strategist at Vanda, wrote to clients on Friday.

Large traders are not pulling back. They are buying select artificial intelligence plays amid the volatility. Shares of the Facebook parent have surged almost 13% in the week following its debut of the Muse Charm device. Momentum has been building for the stock since Meta unveiled its Muse personal AI agent earlier this month.

Retail traders had a banner performance in 2025. Their activity helped buy the dip during market declines in the wake of President Donald Trump's tariff rollout. Goldman Sachs found retail investors' share of S&P 500 trading volume has trended down from its peak nearly a year ago. The bank reported that share is now more than three percentage points below the five-year average.

"it's making investors far more selective." Patel said. Large funds are stepping in to fill the gap left by smaller traders. The current setup rewards focused positioning over broad speculation. Big money maintains its exposure to high-growth sectors while navigating rising yield costs.