Please note ticker test date addition below, in bold-face type.

As a reminder, starting Sunday, June 3, 2007,CME^® will begin permitting new trades, bids/asks, strike prices and settlements to occur at prices of 0 (zero).  This change is initially being made to accommodate the CME^® Snowfall Index and Snowfall Seasonal Strip futures along with other anticipated CME^® products.     We anticipate introducing similar products with pricing (trades, bids/asks, strikes and settlements) that may be negative, zero or positive.

ITC 2.1 Message Format Impact

CME will introduce the following changes on June 3, 2007:

• The use of a new ITC 2.1 Message Format Price Indicator of “B” to blank out prices
• Any price field containing all “zeros” will now indicate that a trade, bid/ask or settlement actually occurred at a price of zero.

It’s important to note that this new procedure is similar to that of other exchanges which support the ITC 2.1 message specification for sending negative and zero prices.

Presently, when CME sends an ITC 2.1 message containing a zero, it designates to our Market Data Distributors that the “prior” price should be removed.  This convention will continue to apply, however, only in those situations when there is a price indicator of “B.”

Please refer to the following examples which illustrate the upcoming changes:  

1.  Price Indicator of “B” with two “blanked out” prices: 

In this example, both prices, in addition to the fractional indicator, price field and sign field, are spaces. The B/A/T code is populated normally with B/A/T, and the price indicator is a “B.”

aH   FB 800000001400330Gb ED  M072X07          BB00000          AB00000c

2.   ITC message containing an actual “zero” price:

In this example, all of the ITC price fields would be populated normally with all zeroes in the price field and “+” in the sign field.  The price indicator is a space. 

aH   FB 800000001400280Gb NQ  H07FH072 0000000+B 000012 0000000+A 00004c

RLC Impact

This change has no impact on RLC users as RLC protocol currently supports zero pricing.

Market data distributors are encouraged to begin system modifications to allow zero and negative trade prices, bid/ask prices, strike prices and settlement prices.  There will an extensive testing period offered during the month of March 2007 (specifics to be published later).

Ticker Testing

Ticker testing will be conducted on Friday, April 20, 2007 and Friday, April 27, 2007 at approximately 4:45 p.m. Central Time.