2006 rank: 17
There seems no limit to Chua's ambitions. As CFO, the 49-year-old helped SingTel embark on a $20 billion Asian expansion. Now, after a year as CEO, she has begun adding her own conquests. The latest target: Pakistan, where Chua acquired 30% of Warid Telecom for $760 million. Although the share price struggles, first-quarter revenues were up more than 10% over last year, to $2.4 billion.