Exnite, a new venture backed by United Arab Emirates-based financier Fawad Tariq-Khan, has acquired a strategic stake in Quintas Capital, an Irish investment firm.  Tariq-Khan, who was born and educated in Cork, previously ran SHUAA Capital, the oldest investment bank in the Middle East with $15 billion in assets under management across public equities, private equity, credit and real estate.  Tariq-Khan is investing through Exnite, a new venture that invests in high-growth companies and emerging fund managers. His investment follows that of Kevin MacSweeny, the former chief investment officer of Broadlake, who took a stake in Quintas in July. “Kevin…