By Oliver Hirt ZURICH (Reuters) – U.S. investment bank JP Morgan’s head of Switzerland, Nick Bossart, is moving to Rothschild & Co to lead its Swiss advisory business for mergers and capital market transactions, two people familiar with the situation told Reuters. A Rothschild & Co spokesperson confirmed the change, which takes effect on Oct. 1. With Bossart, the French investment bank wants to expand its market share in Switzerland. Bossart headed JP Morgan’s investment banking in Switzerland for 10 years and was also country head since 2014. During this time, he made JP Morgan the third-larg…