On February 23, 2016, CBOE launched trading of weekly options on the S&P 500® Index which expire on Wednesdays.
The average daily volume for SPXW Wednesday-Expiring Weekly Options grew from 74,114 in May, to 105,768 so far this month (through June 14).
POTENTIAL BENEFITS – PRESS RELEASE
CBOE’s February press release noted –
"We are pleased to further expand our SPX product complex with the introduction of SPX Weeklys with Wednesday expirations," said CBOE Holdings[...]