On Tuesday, Oatly announced that it had confidentially filed for an initial public offering in the U.S. Starbucks added oat milk from Oatly competitor Elmhurst 1925 at select upscale Reserve locations in 2019. Last year, it started testing a wider audience with Oatly's version through a pilot in the Midwest. The coffee chain has been adding more plant-based alternatives to its menu in an effort to attract new customers and be more environmentally friendly. Coffee shops have always played an important role in Oatly's expansion strategy.