In midday trading, several companies made headlines: Palantir and Dell surged following the announcement that they would join the S&P 500 on Sept. 23, with Palantir replacing American Airlines and Dell replacing Etsy. Summit Therapeutics saw a 65% increase after its lung cancer drug outperformed Merck’s Keytruda, while JetBlue Airways, Boeing, MarineMax, Arm Holdings, United States Steel, and cannabis stocks also experienced notable movements based on various upgrades, deals, and market developments.
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