Sompo Holdings Inc. is aiming to increase investments in higher-yielding overseas credit to boost profits as traditional business flounders at Japan’s third-biggest property and casualty insurer.The Tokyo-based company moved several investment managers from its Japan insurance subsidiary to work in the US from this month, according to Toshinobu Kondo, general manager of Sompo’s investment management department. The Japan and US units may try to lower costs by picking the same asset managers for deals includ ...