Modification of 5 Percent Overnight Price Limit Rules for Equity Index Futures
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On Sunday, January 11, 2009, CME Group will modify the rules regarding the 5 percent overnight price
limits for U.S. equity index futures traded on CME Globex during the ETH session. These modifications
are designed to help preserve the marketâs ability to provide price discovery prior to the opening of the
underlying cash market in all market conditions, without requiring a change in the overnight price limit.
Currently, if the 5 percent overnight limit is reached during the ETH session, and the market remains
locked-limited until the opening of the Regular Trading Hours (RTH) session, the marketâs capability to
provide price discovery before the opening of the underlying cash market is negated.
Starting Sunday, January 11, 2009, however, if the market is locked-limited as of 8:15 a.m. Chicago time
(15 minutes prior to the start of the RTH session) and still remains so at 8:25 a.m. (5 minutes prior to the
start of the RTH session), the market will be halted and put into pre-open state. This will provide an
Indicative Opening Price (IOP) in anticipation of a re-open on RTH, with the RTH limits in place â and
effectively re-establish the marketâs price discovery capability.
Which Products Are Affected?
⢠This rule change applies to all legacy CME and CBOT equity index futures on U.S. stock indexes,
including contracts based on :
o S&P 500
o S&P MidCap 400
o S&P SmallCap 600
o S&P 500/Citigroup Growth
o S&P 500/Citigroup Value
o SPCTRS
o NASDAQ-100
o NASDAQ Composite
o NASDAQ Biotechnology
o Dow Jones Industrial Average
o Dow Jones U.S. Real Estate
⢠Contracts on non-U.S. indexes are not affected by this change
....
......
On Sunday, January 11, 2009, CME Group will modify the rules regarding the 5 percent overnight price
limits for U.S. equity index futures traded on CME Globex during the ETH session. These modifications
are designed to help preserve the marketâs ability to provide price discovery prior to the opening of the
underlying cash market in all market conditions, without requiring a change in the overnight price limit.
Currently, if the 5 percent overnight limit is reached during the ETH session, and the market remains
locked-limited until the opening of the Regular Trading Hours (RTH) session, the marketâs capability to
provide price discovery before the opening of the underlying cash market is negated.
Starting Sunday, January 11, 2009, however, if the market is locked-limited as of 8:15 a.m. Chicago time
(15 minutes prior to the start of the RTH session) and still remains so at 8:25 a.m. (5 minutes prior to the
start of the RTH session), the market will be halted and put into pre-open state. This will provide an
Indicative Opening Price (IOP) in anticipation of a re-open on RTH, with the RTH limits in place â and
effectively re-establish the marketâs price discovery capability.
Which Products Are Affected?
⢠This rule change applies to all legacy CME and CBOT equity index futures on U.S. stock indexes,
including contracts based on :
o S&P 500
o S&P MidCap 400
o S&P SmallCap 600
o S&P 500/Citigroup Growth
o S&P 500/Citigroup Value
o SPCTRS
o NASDAQ-100
o NASDAQ Composite
o NASDAQ Biotechnology
o Dow Jones Industrial Average
o Dow Jones U.S. Real Estate
⢠Contracts on non-U.S. indexes are not affected by this change
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