The S&P 500 index hit a new all-time high this week, but this record masks an extremely fragile market foundation—only about 30% of its constituent stocks are trading above their 50-day moving average, marking the lowest market participation on a record-setting trading day since Bloomberg began tracking data in 1990. Meanwhile, the Russell 2000 small-cap index has fallen for a fifth consecutive week, with a cumulative decline of approximately 8.5% from its peak, approaching a technical correction. Lynn Martin, President of the New York Stock Exchange Group, directly attributed the recent postponements of several high-profile IPOs to rising interest rates.