Stocks making the biggest moves midday: Planet Fitness, Whirlpool, Vital Farms, Shake Shack & more

Check out the companies making the biggest moves midday: Planet Fitness — The gym operator fell nearly 33% after it lowered its full-year earnings outlook. The company now sees its bottom line growing about 4% year on year. That's down from a forecast that called for an expansion of 9%-10%. Vital Farms — The eggs producer dropped 20% on a surprise loss for the first quarter. Vital Farms lost 3 cents per share, excluding certain items. …