Apple may be on the verge of becoming the largest company in the world in terms of market capitalization, an Associated Press report notes. Although Apple stock is down more than $4 as of mid-Monday, if the price resumes an upward trajectory, it may soon put the total value of Apple shares over that of Exxon Mobil, the current market cap leader. Correspondingly, Apple would assume the top position in the S&P 500 index.