OCC, the equity derivatives clearing firm, has added Felix Davidson, Raymond Di Sanza and Craig Messinger to its board of directors. Davidson is president of TD Ameritrade Clearing and managing director of operations. Di Sanza is senior vice president of operational services for Charles Schwab and leads the custody and asset servicing group in operational services. Messinger is executive vice president and head of trading and trading risk at Bank of New York Mellon.