Stocks making the biggest moves midday: Stanley Black & Decker, American Airlines, Dow, Marvell Technology & more

by | Apr 20, 2026 | Financial

Check out the companies making the biggest moves in midday trading: Stanley Black & Decker — The power toolmaker jumped more than 4% after it said recent changes to Section 232 tariffs aren’t supposed to have a material impact on its full-year forecast . Section 232 tariffs set a general 50% rate on aluminum, steel and certain related products while some specific copper and derivative products are subject to a 25% rate, per the White House . Fermi — Shares of the energy infrastructure developer fell more than 22% following the resignation of CFO Miles Everson , just days after CEO Toby Neugebauer departed . Fermi was co-founded by former Energy Secretary Rick Perry to supply power to AI data center projects. Compass Pathways , AtaiBeckley — The psychedelic-focused drug developers were among several mostly smaller stocks surging in the wake of President Donald Trump’s executive order to accelerate research and access to psychedelic medicines. AtaiBeckley stock jumped more than 25%, while Compass rose nearly 40%. Biogen — The biotech’s stock rose nearly 3% after agreed to pay TJ Biopharma $850 million for the exclusive rights in China to sell felzartamab, an experimental treatment for immune-related diseases such as IgA nephropathy. The deal gives Biogen worldwide rights to develop and market the drug. Airlines — The group was under pressure Monday as investors worry that renewed U.S.-Iran tensions will keep energy price …

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