Market Wrap: Monday, September 21, 2026 — S&P 500, Nasdaq & Dow Jones

Today's market session was characterized by a broad-based rally, with all three major indices closing in positive territory. The Nasdaq Composite led the advance, surging 2.26% to a record close, buoyed by a 2% jump in AI stocks and a retreat in oil prices and Treasury yields. The S&P 500 and Dow Jones Industrial Average also posted solid gains of 1.49% and 0.71%, respectively, as investors rotated into tech and chip stocks. AMD, for instance, hit a $1 trillion market cap for the first time, riding a 5-day rally. The rally was further supported by a decline in oil prices, which fell on hopes of progress in US-Iran talks, and a retreat in Treasury yields, which eased pressure on growth stocks. Meanwhile, the resilient stock market is flashing warning signs, with some economists cautioning that the ongoing boom could lead to a 'retirement party' for older workers, potentially exacerbating labor shortages.