Shares of Beyond Meat Inc. BYND, +4.81% shot up 14% in premarket trading Thursday, after McDonald's Corp. MCD, +0.95% said it will trial a plant-based burger made by Beyond Meat. Starting Sept. 30, McDonald's will sell what it will called the P.L.T. -- Plant. Lettuce. Tomato. -- in 28 restaurants in Southwestern Ontario. The trial is slated to run for 12 weeks.