as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
options on the e-mini s&p 500 futures at the cme: when were ew3, the weekly monday options and the weekly wednesday options introduced?
user
the traditional e-mini s&p500 options (introduced on 09/09/97) already expire on the 3rd friday, so there's no need for another "weekly" option that expires at the same time.
assistant