DH ▲ +14.3% - Definitive Healthcare Corp. $DH - Definitive Healthcare Appoints Clay Ritchey as CEO Definitive Healthcare appointed Clay Ritchey as its new CEO, a leadership change that drove shares up 14.3% today. The market's positive reaction suggests investors view Ritchey's appointment as a constructive move for the healthcare data and analytics company. 02-SEP-2026 08:31 AM ET