Following a heady Nasdaq debut on Thursday and another surge in Friday's session, the Swedish food company is now valued at about $13 billion, a lofty level for one that took in $421 million in revenues last year from sales of oat-based milk, ice cream and other products not made with space-age technology. Oatly is far from alone in the emerging space. Earlier this month, Nestle launched a new non-dairy milk made with peas, adding to a slate of plant-based options for burgers, sausages and tuna.