U.S. oil prices hit three-month lows, trading below $80 a barrel for the first time since March, causing Exxon and Chevron stocks to fall following news of a U.S.-Iran deal. On June 22, crude oil prices dropped by more than 2% during the trading session. Market indices showed mixed results as the Nasdaq Composite fell over 300 points while the Dow Jones Industrial Average rose by 0.28%.