Shares rise 5 pct after improved guidance, better quarter than expected. Maersk indicates more buybacks after first in its history. Efficiency, cost savings boost Maersk Line compared to rivals. Denmark's A.P. Moller-Maersk announced the first share buy-back in its 110-year history on Tuesday as an overhaul of the sprawling shipping and oil empire leaves it with more cash than it can usefully invest. Maersk shares jumped 5 percent after the company reported better than expected quarterly earnings and raised its 2014 profit guidance, as cost cuts at its container shipping arm help it navigate weakness in the global economy. "The share buy-back program ...