The steeply discounted IPO price, at less than 60 percent of the company’s last private valuation, had raised questions about the prospects of other so-called ‘unicorns’ – startups worth at least $1 billion – that might want or need to go public. A number of tech IPOs have performed poorly over the past year, and mutual fund investors including Fidelity Investments have been marking down the value of their private tech holdings.