David Solomon, CEO of Goldman Sachs (L), Jamie Dimon, CEO of JP Morgan (C), and Ted Pick, CEO of Morgan Stanley.CNBC | Getty Images | CNBCFueled by the global boom in artificial intelligence stocks, relaxed capital rules and greater lending to hedge funds, big Wall Street banks have already had a banner year for equities trading — even with one quarter left to go.The five biggest investment banks have generated about $67 billion in equities revenue through Sept. 30, according to company filings. That is $7 ...