Having broken the $500 barrier earlier in the day, shares of AAPL closed today at a new all-time record high of $502.60, though the stock is fluctuating around the closing figure in after-hours trading. The milestone puts Apple even further ahead of ExxonMobile as the world's most valued publicly-traded company with a new market capitalization of $468.61 billion while still maintaining a low price-to-earnings ratio (P/E) of 14.30.