https://www.reuters.com/article/us-shopify-citron/citrons-left-says-follow-up-report-on-shopify-likely-idUSKBN1CG2ET >Short-seller Andrew Left of Citron Research said on Wednesday he was investigating various aspects of software company Shopify Inc's business and would "most likely" publish a follow-up to an Oct. 4 report that sent its shares plunging.