Omar Marques | Sopa Images | Lightrocket | Getty ImagesShares of stock brokerage platform eToro popped in their Nasdaq debut on Wednesday after the company raised almost $310 million in its IPO.The stock opened at $69.69, or 34% above its IPO, pushing its market cap to $5.6 billion. Shares were last up more than 40%.The Israel-based company sold nearly 6 million shares at $52 each, above the expected range of $46 to $50. Almost 6 million additional shares were sold by existing investors. At the ...