The wireless communication giant, which has currently about 12,000 employees on its rolls, has also extended its market from corporate types to common consumers.

Giving credit to them for this, Fortune magazine says RIM co-CEOs Jim Balsillie and Mike Lazaridis are 'more than holding their own' against Apple head Steve Jobs.

Apple had mounted a huge challenge to the BlackBerry maker last year by launching its iphones.

However, Fortune warns RIM that competition is 'getting increasingly stiff' with changing consumer demands.

Currently, BlackBerry has a subscription base of about 29 million in about 150 countries.

At about $80, RIM shares are still almost half of the $150-peak they touched early last year.

To be eligible for the list, foreign companies should be traded on a US exchange and file quarterly reports. Fortune ranks the companies on the basis of three years of revenue and profit growth and total return.