As the U.S. stock markets prepare to open in two hours, here's a quick overview of some pre-market movements: Marathon Digital Holdings Inc. (MARA) is showing promising signs with a 4.3% increase. Plains GP Holdings LP (PAGP) is also enjoying a positive pre-market boost, up by 4.1%. In the same vein, several other companies are experiencing gains: Bio-Rad Laboratories Inc. … [Read more...] about U.S. Stock Market Update