Sell To Open A phrase used by many brokerages on the street to represent the opening of a short position in option transactions. Investopedia Says: An investor can sell to open either (or a combination of) puts or calls and thus will be holding the option(s) short. The distinguishing factor of a sell to open is that the option position must not be held long in the account during the transaction. Related Terms: Buy Buy to Close Buy to Open Call Long Open Interest Option Put Sell to Close Short |