The race to become the world's first trillion-dollar company was won in August, and since then yet another powerhouse firm has (briefly) attained the epic financial milestone. Based on market cap data as of 17 September, we rank the world's 30 most valuable companies and reveal the two tech titans next in line to hit the coveted $1 trillion (£760.19bn) mark. Unless otherwise stated, all market cap data is courtesy of YCharts.