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____________________Forward Header_____________________
Subject: Re-Balance of Nasdaq-100? Index
Author: owner-cboe_general_announcements@xxxxxxxx
Date:  12/3/98 5:49 PM

  
CBOE Regulatory Circular #RG98-134

December 3, 1998

Re-Balance of Nasdaq-100(r) Index

CBOE has been informed by Nasdaq that following the close of business on 
December 18, 1998, Nasdaq will change the Nasdaq-100 Index (NDX) to a 
modified capitalization weighted index (the "New Index"). The Nasdaq will 
continue to calculate the index using the standard capitalization-weighting 
methodology (the "Old Index") until March 20, 1999 to facilitate options 
trading. The "Old Index" will be disseminated by the Nasdaq under the 
symbol IXO. The "New Index" will be disseminated under the symbol NDX.

Adjustment to Current Option Series

All Nasdaq-100 options series outstanding on December 18 will continue to 
settle based on the "Old Index" (IXO). Currently there are nine underlying 
symbols associated with the NDX -series currently using the underlying 
symbol NDX will have a symbol change to IXO, all remaining symbols will 
stay the same. The settlement value symbol for these contracts will be NDA. 
Following are the underlying symbols associated with the NDX as of December 
3, 1998:


  Current   Expiration  New
Symbol  Strikes   Months   Symbol
NDX   900 - 990   Mar 1999  IXO
NDV   1010 - 1090  Jan, Mar 1999  NDV
NCZ   1100 - 1190  Jan, Mar 1999  NCZ
NDY   1200 - 1290  Jan, Mar 1999  NDY
NDZ   1300 - 1390  Jan, Mar 1999  NDZ
NDU   1400 - 1490  Jan, Mar 1999  NDU
NDO   1500 - 1590  Jan, Mar 1999  NDO
NDK   1600 - 1690  Jan, Mar 1999  NDK
NDL   1700 - 1790  Jan, Mar 1999  NDL



New Option Series

Options based on the "New Index" ("NDX") will be listed on December 21, 
1998. At-the-money options will be listed under the symbol NDX. Additional 
symbols may have to be used for other strike prices. The settlement value 
symbol for options based on the "New Index" will be NDS. The new series to 
be listed will be determined by the Exchange and disseminated by Wednesday, 
December 16.

Position Limits

Any combination of options based on the "Old Index" and options based on 
the "New Index" cannot exceed 15,000 contracts in the near-term and 25,000 
contracts overall.

Calculation of the New Index

The new modified capitalization-weighting methodology is intended to make 
the index more diversified. To implement the change, Nasdaq will review the 
composition of the Nasdaq-100 Index on a quarterly basis, beginning in 
December 1998, and will adjust the weightings of Index components using a 
proprietary algorithm whenever (1) Any individual component security 
represents more than 24% of the total market value of the Index, and/or (2) 
The combined weight of all securities having individual weightings of at 
least 4.50% exceeds 48% of the total market value of the Index. (Once the 
index has been adjusted, it will be re-adjusted only if the adjusted index 
exceeds the 24% or 48% thresholds.) More information on the new calculation 
of the index can be obtained at the nasdaqtrader.com web site.

On Friday, December 11, Nasdaq will post the shares to be used in the "New 
Index" on the nasdaqtrader.com web site.

Other Index Changes

ADDITONALLY on December 18, Nasdaq will perform its regularly scheduled 
quarterly share changes as well as the annual component changes. Please see 
nasdaqtrader.com on December 11, for the new shares and new components for 
both the OLD and NEW indices.

Questions regarding this memo can be addressed to the CBOE Investor 
Services Department at 1-800-OPTIONS (1-800-678 4667).