According to Fortune, Research In Motion, maker of the BlackBerry, is the fastest growing tech company in the world. There isn't much information on the rankings, but they are apparently determined various criteria including profits, turnover and investment return over three years.

Though we already knew that RIM made a whole potload of moola, Fortune reveals that the rise in popularity of BlackBerry smartphones (and apparently the fact that, the Curve outsold the iPhone during the first half of this year) contributed to RIM's 84 percent rise in profits.

Trailing behind the Canadian company on the "100 Fastest Growing Firms" list is U.S. chipmaker Sigma Designs. Apple hits at 39 on the list. [Fortune and BBC]