Top JPMorgan rainmaker Matthew Demko jumps ship from Jamie Dimon-led bank
1. JPMorgan's managing director Matthew Demko has resigned. 2. Demko joins insurance company Ryan Specialty Group. 3. He worked at JPMorgan for over a decade. 4. Demko played a key role in leveraged finance. 5. His departure could impact JPMorgan's investment banking talent.