Parexel International ($PRXL) has approved a stock repurchase program of up to $150 million, and the company plans to use its existing cash and credit to buy up its own shares and boost investor value. The move comes after an up-and-down 12 months for Parexel, whose shares plummeted in the fall on concerns over net new business wins but have since climbed back to around $54, roughly gaining back all the value they lost. More