Three portfolio managers who previously worked together in Koch Industries’ investment-management division are starting a hedge fund with backing from their former employer.Daniel Nesbitt, Thong Nguyen and Utkarsh Samant already have received investor commitments totaling $200 million for a fund they plan to launch from their Greenwich, Conn., firm, Keebeck Alpha. Word has it that Koch will contribute a good chunk of the day-one capital.The...