ExxonMobil Hits All-Time High, Closes in on Half-Trillion-Dollar Market Cap. Has the Stock Market's Leadership Changed?

The energy sector has been on an incredible run over the last few years.ExxonMobil (XOM 1.15%) reached an intraday all-time high of $123.75 per share on April 12. The oil major has pulled back a little since then, but Exxon is still up big on the year and has more than doubled over the last three years.Exxon's market capitalization currently sits at$474 billion as it approaches the feat of becoming the first half-trillion-dollar energy stock. Here's why Exxon is in favor with investors, and why the rally h ...