Insurtech startup Turtlemint’s weak stock market debut on Monday pared the paper gains of its early venture investors, even as Peak XV Partners, Nexus Venture Partners and Blume Ventures locked in gains on shares sold through the insurance distribution company’s offer for sale at the initial public offering (IPO) issue price.The stock listed at Rs 134.90 on the National Stock Exchange (NSE), an 11.25% discount to its IPO issue price of Rs 152.