Freshly minted Square shares become target for short sellers

By Noel Randewich SAN FRANCISCO (Reuters) - Short sellers did not wait long to bet against mobile payments company Square Inc , whose steeply discounted initial public offering last month increased concerns about sky-high valuations for Silicon Valley's biggest startups. About 85 percent of Square shares available for lending from institutional investors have been snapped up since the Nov. 18 IPO, with borrowers paying a 45 percent annualized interest rate, according to data from SunGard's Astec