Box, the online storage company started by a pair of Mercer Island High School graduates, is seeking additional funding from private equity firm TPG to tide the company over before its initial public offering, according to a report by the Wall Street Journal. The company filed for its IPO on March 24, right after the market for tech stocks began to soften. An additional funding boost would give the rapidly growing cloud storage service some additional breathing room to choose when it wants to set its IPO date. Other tech companies have since had successful IPOs, but uncertainty remains about how much Wall Street is interested in cloud storage firms like Box. The company reported a $168.6 million loss for its 2013 fiscal year, on revenues of $142.2 million, so it’s possible that Box could start feeling a squeeze if it keeps going without an infusion of funding.