Investopedia explains 'Mega Cap'
The ranks of the mega caps were traditionally dominated by companies from the U.S., Europe and Japan. However, the steady rise of the biggest emerging nations in the new Millennium, has resulted in increasing representation from companies in nations such as China. As of 2011, three Chinese companies ranked among the world's 10 biggest mega caps: PetroChina, the Industrial Commercial Bank of China and China Construction.
On a sectoral basis, the commodity boom in the first decade of the new Millennium resulted in many energy and resource companies achieving mega-cap status. On the flip side, the dramatic decline in U.S. and European banks in the aftermath of the 2008 global credit crisis, resulted in some of the biggest banks losing mega-cap status.
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