Matrix Gas & Renewables Limited has raised Rs 350 crore in a pre-initial public offering round to raise funds, said the company on Tuesday. Key investors in the pre-IPO round included Gunavanth Vaid, Sarda Group, Sunil Kumar Singhvi, Blue Lotus Fund, NAV Capital Emerging Fund and Matrix’s promoters. Matrix is backed by Anmol Singh Jaggi and Puneet Singh Jaggi, founders …