NEW YORK, Dec 15 (Reuters) - Nasdaq, one of the world's largest exchanges that is home to tech companies Nvidia (NVDA), Apple (AAPL) and Amazon (AMZN), is planning to submit paperwork with the U.S. Securities and Exchange Commission on Monday to roll out round-the-clock trading of stocks, as it looks to capitalize on a global demand for U.S. ​equities. Investor demand for nonstop trading in U.S. stocks has surged in recent years, prompting regulators to introduce new rules and green-light proposals from ...