Changes will be made to the handling of stock prices used for indices in conjunction with amendments to the trading rules coinciding with the launch of arrowhead scheduled for January 4, 2010 and revise the start time of index calculation.
Contents of the changes and revisions are as follows.
1. Details of changes
(1) Changes in Handling of Stock Prices Used for Indices
The following changes will be made to the handling of stock prices used for indices in conjunction with amendments to the trading rules coinciding with the launch of arrowhead scheduled for January 4, 2010.
Before changes:
(1) Special indicative price(2) Contract price
(3) Base price for index calculations as obtained by the priorities shown
below
a. Ex-rights theoretical price
b. The latest special indicative price up to the preceding day
c. The latest contract price up to the preceding day Any stock subject to a
trading halt is included at the last price before the halt.
After changes:
(1) Special indicative price or sequential trade quote(2) Contract price
(3) Base price for index calculations as obtained by the priorities shown
below
a. Ex-rights theoretical price
b. The latest special indicative price or sequential trade quoteup to the
preceding day
c. The latest contract price up to the preceding day
For more details of revisions to trading rules at the time of launching "arrowhead" as follows :
(2) Revise the start time of index calculation
Before changes: 9:01:00
After changes: 9:00:15
2. Implementation Date
Monday, January 4, 2010
However, in the case where the Exchange deems that, when a malfunction occurs in the trading system, trading cannot be executed pursuant to the amended trading rules or that there is a possibility of such occurrence, changes shall be implemented on a day on or after January 4, 2010 set forth by the Exchange.
