(Reuters) – Shares of Expensify Inc increased almost 47% in their stock market debut, valuing the expense management platform at about $3.87 billion, including its name to the growing roster of technology companies that have actually cashed in on high investor hunger for tech stocks.Portland, Oregon-based Expensifys shares opened at $39.75. The company and offering shareholders offered 9.73 million shares priced at $27 a piece in its initial public offering, at the top of the cost range revealed previously, raising $262.7 million.The financial technology platform, established in 2008, is a cloud-based expenditure management software application catering to medium-size and small businesses. The company allows customers to scan and compensate invoices from flights, hotels, coffee stores, office materials and trip shares.U.S.