highest market cap companies in the us
China) are the top risers since 31 March 2014. â¢ The market cap of the most valuable company at 31 March 2015, Apple, has increased by 54%. to $725bn. The US has the highest combined market capitalisation of national Global Top 100. companies ($9.3trn), a 12% increase since 31 March 2014. â¢ In 2015 there are 53 US companies in the Global Top 100 against 47 in 2014. China has taken. the second position over the UK, which lies now third in terms of market cap.