The S&P 500 traded in a 7651–7684 range during the week of September 28, 2026, closing at 7666.45 on October 1 after declining from the prior week’s 7743 peak. Rising 10-year Treasury yields, which posted their largest monthly increase since 2022 and reached multi-year highs, weighed on valuations amid elevated oil prices tied to geopolitical tensions. Softer-than-expected August PCE inflation data provided modest relief by reducing near-term rate-hike odds, while a higher second-quarter GDP revision highlighted resilient consumer spending and AI-related investment. Equity sentiment reflected quarter-end positioning and sensitivity to bond-market moves, with the index posting its second consecutive quarterly gain despite September’s monthly decline.