Stocks making the biggest moves midday: UnitedHealth, Pitney Bowes, Apple, Amazon & more https://www.cnbc.com/2026/04/21/stocks-making-the-biggest-moves-midday-unh-pbi-aapl-amzn.html?taid=69e7a7665535e300015cf248&utm_campaign=trueanthem&utm_content=main&utm_medium=social&utm_source=twitter