Shopify stock is on the rise after an upgrade from Redburn Atlantic to "buy"Shopify Inc (NYSE:SHOP) stock is up 2.4% at $75.32 at last check, after an upgrade from Redburn Atlantic to "buy" from "neutral," with a price-target hike to$99. The firm cited social e-commerce growth, as the company continues to integrate into social media platforms in a way that drives sales. SHOP has had a volatile few months, dropping close to the $50 level before its massive post-earnings bull gap in early August. Since the s ...