Guggenheim Partners, the US investment bank, has added two to its equity research team. Louise Chen will cover the speciality pharmaceutical sector, and Bret Holley will cover the biotechnology sector, both as managing directors based in New York. Chen previously worked at New York-based firm Auriga USA as a managing partner and senior analyst of equity research. Holley previously worked as a managing director and senior research analyst at Oppenheimer & Co., formerly CIBC World Markets.