U.S. stock indexes closed lower on Tuesday as oil prices and bond yields rose following military strikes on Iran, with the S&P 500 falling 0.7%, the Dow Jones dropping 0.8%, and the Nasdaq sliding 1%. ^[1] Pulmonx Corporation's stock dropped 10.1% in pre-market trading to $2.05, with no single headline catalyst pinpointed for the move. ^[2] The price of Brent crude rose 4.6% to settle at $94.65 per barrel, and U.S. oil climbed 5.2% to settle at $90.22 per barrel, the first time it closed above $90 in more than a month. ^[3] The S&P 500 index fell 54.67 points to close at 7,631.47, the Dow Jones Industrial Average dropped 419.02 points to 52,766.88, and the Nasdaq composite fell 271.11 points to 26,099.77. ^[4] The yield on the 10-year U.S. Treasury rose to 4.79% from 4.75% late Monday, while the yield on the 2-year Treasury rose to 4.39% from 4.34% late Monday. ^[5] Japan's 2-year government bond yield reached 1.81%, its highest level in 31 years, on 2026-09-01. ^[6] President Donald Trump warned of a strong response to Iran after attacks on US military bases on 2026-08-31. ^[7] The Dow Jones Industrial Average fell 301 points, or 0.6%, on 2026-09-01. ^[8] Analysts characterized Pulmonx's Q2 2026 earnings call as striking a cautious tone, which has continued to weigh on the stock. ^[9] Pulmonx's Q2 2026 earnings report, released in late July 2026, showed worldwide revenue declining 5% year-over-year. ^[10] The decline followed a significant run-up from Pulmonx's 52-week low of $1.13, making profit-taking a plausible driver as shares approached technically extended levels. ^[11]