A nice summary from Hulbert:
“Buyback strategies aren’t nearly as time-sensitive, according to David Ikenberry, dean of the Leeds School of Business at the University of Colorado Boulder and one of academia’s leading experts on stock buybacks. In an interview, he said that he has found in his research that the average buyback stock outperforms the market in each of the four years following the company’s announcement of its share-repurchase program.”
Professor’s homepage here.