US Equities Edge Lower on Tuesday September 29 After Monday's 0.6-0.8% Drop, S&P 500 at 7,680 as Oil Above $107 and Yields at 5.24% Keep Pressure On

US stock indices opened lower on Tuesday, September 29, 2026, following Monday's selloff that saw the S&P 500 drop 0.6 to 0.8 percent to close around 7,683.69, the Dow Jones Industrial Average fall 0.67 percent or 347 points to 51,481.51, and the Nasdaq Composite shed 0.9 to 1.1 percent to settle at 26,820.38, according to CNBC, TheStreet, and Bloomberg. Trading Economics reported the S&P 500 at 7,680 on September 29, down 0.04 percent from the previous session. Monday's decline was driven by renewed US-Iran tensions that pushed Brent crude back toward $107 per barrel and sent the 10-year Treasury yield to 5.27 percent intraday, the highest since June 2007, before easing slightly to 5.24 percent on Tuesday. Only three S&P 500 sectors advanced on Monday: Health Care (+0.29%), Consumer Staples (+0.22%), and Energy (+0.11%), while Communication Services (-1.56%), Consumer Discretionary (-1.43%), Financials (-1.14%), and Industrials (-1.00%) all fell by at least 1 percent. Boeing plunged 6 to 6.9 percent after the FAA delayed certification of the 737 Max 10 over a new software issue, according to TheStreet and Trading Economics. Twenty-eight stocks hit new 52-week lows while just three reached new highs, according to CNBC.

The persistent equity weakness matters because it erases the September rally and leaves the S&P 500 having wiped out the month's gains, with the index now up only 2 percent for the quarter despite being up more than 12 percent year-to-date, according to CNBC and Bloomberg. The combination of rising yields, elevated oil, and Fed tightening is squeezing multiple expansion at a time when corporate earnings growth is moderating, creating a margin of safety problem for investors who have pushed valuations to historically rich levels. Schwab notes that this week brings a full slate of inflation and labor data, including the August PCE inflation report on Wednesday and the September jobs report on Friday, either of which could reinforce the case for additional Fed hikes and push yields even higher. If the 10-year yield breaks decisively above 5.3 percent or oil climbs past $110, algorithmic selling and volatility-targeting funds could trigger a sharper drawdown, potentially testing the 200-day moving average around 7,400 for the S&P 500.

Sources

CNBC (multiple), 'Stock market news for Sept. 28, 2026,' September 28, 2026, cnbc.com; TheStreet (multiple), 'Stock Market Today (Sept. 28, 2026): Nasdaq, S&P 500 fall after Trump rebuffs Iran peace deal, oil prices rise,' September 28, 2026, thestreet.com; Bloomberg (Rita Nazareth), 'Stock Market Today: Dow, S&P Live Updates for September 28,' September 28, 2026, bloomberg.com; Trading Economics, 'United States Stock Market Index - Quote - Chart - Historical Data - News,' September 29, 2026, tradingeconomics.com; Charles Schwab, 'Wall Street Tug of War: Geopolitics, Data Compete,' September 28, 2026, schwab.com; Yahoo Finance, 'Stock Market News for Sep 28, 2026,' September 28, 2026, finance.yahoo.com.