Oil prices sank again, while U.S. stocks drifted to a mixed finish near their all-time highs. The S&P 500 slipped 0.6%, though it was nearly evenly split between rising and falling stocks. The Dow gained 0.6% to hit another record, while the Nasdaq composite fell 1.2%. Drops for several influential AI stocks weighed on the market. They’ve been leading the market up and down amid worries their stock prices shot too high. Brent crude’s price dropped below $80 per barrel for the first time since early March as optimism continues following a tentative deal on the U.S.-Iran war.