The new hours will begin at 7 PM on Sunday nights and 3:15 PM, Mondays through Thursdays and continue through 2:30 PM the following day. Previously, the hours were 7:30 AM to 2:30 PM.
The Exchange customer service call center, at (800) 438-8616, will be available for assistance with these transactions from 7:30 AM to 5 PM.
Since these services were launched on May 31, nearly $5 billion worth of OTC trades have been cleared through the Exchange.
Exchange President J. Robert Collins said, "This move will further expand the flexibility and availability of these services to our expanding customer base."