Price Limits/ Circuit Breaker Rule
Price Limits
Index futures and options
The price limits for index futures and options contracts are set according to each underlying index category.
In the case where a Circuit Breaker is triggered, trading will be halted and the price limit range will be expanded.
Periodic update of the price limit range
 For Nikkei 225 Futures, Nikkei 225 mini ,TOPIX Futures, miniTOPIX Futures, JPXNikkei 400 Futures, TOPIX Core30 Futures, TOPIX Banks Index Futures , TSE REIT Index Futures, RN Prime Index Futures , Nikkei 225 Options and TOPIX Options,the price limit range shall be calculated by multiplying the base price for calculating the price limit range by the following rates. This base price for calculating the price limit range is a value obtained by using reference prices of price limits from a most recent time period(*).In principle, the price limit range will be recalculated on a quarterly basis (March, June, September and December)
 The price limit range for DJIA Futures will be revised every 3 months(April to June, July to September, October to December, and January to March). Base price for calculating the price limit range is the closing level of DJIA on the last day of the last month of the quarter will be applicable for the next quarter. Please note that the applicable period of the price limits for DJIA Futures is different from other OSE products. Please note that the applicable period of the price limits for OSE DJIA Futures is different from other OSE products.
 The price limit range for India Nifty50 Futures will be revised every 3 months(April to June, July to September, October to December, and January to March). Base price for calculating the price limit range is the closing level of Nifty 50 on the last day of the last month of the quarter will be applicable for the next quarter.
 The price limit range for Nikkei 225 VI Futures will be 10 points (absolute value) and will not be recalculated regularly.
(note)
 ･Base price for calculating the price limit range.
The average value of the reference price of the price limits for bids and offers (=previous day's settlement price) on each trading day with regards to the leading contract month on each underlying index for 20 days from the trading day ending on the day that is 25 days prior to the trading day (or the following business day, if it falls on a nonbusiness day) listed in the following (a) through (d).
(a) Trading day ending on March 1
(b) Trading day ending on June 1
(c) Trading day ending on September 1
(d) Trading day ending on December 1
Base price for calculating a price limit range
(note)
 ･In the case where the ratio of the price limit range at the 2nd expansion of price limits to the reference price for price limits is beyond 20% for the two straight days(Nikkei 225 Futures, Nikkei 225 mini ,TOPIX Futures, miniTOPIX Futures, JPXNikkei 400 Futures, TOPIX Core30 Futures, TOPIX Banks Index Futures , TSE REIT Index Futures, RN Prime Index Futures , Nikkei 225 Options and TOPIX Options) or in other cases where OSE deems it necessary,OSE will make an extraordinary revision of the price limit range.
In case of Index Futures, only price limits in one direction, up or down, will be expanded. For Index options, both the upper and lower limits will be expanded
Expansion of upper or (and) lower price limits when a Circuit Breaker is triggered
 The price limits for Index Futures(except for Dividend Index Futures and Nikkei 225 VI Futuresi) will be expanded to the 1st expansion of price limits, and then to the 2nd expansion of price limits.
 Normally, the upper or lower price limit range for Nikkei 225 VI Futures will be expanded by 5 points (no limitation on how many times the price limit range will be expanded).
 In case of Index Futures, only price limits in one direction, up or down, will be expanded. For Index options, both the upper and lower limits will be expanded .
Category 
Normal 
1st Expansion 
2nd Expansion 
Index Futures 
Nikkei 225 Futures, Nikkei 225 mini 
8% 
12％ 
16％ 
TOPIX Futures, miniTOPIX Futures 
JPXNikkei 400 Futures 
TOPIX Core30 Futures 
TOPIX Banks Index Futures 
TSE REIT Index Futures 
RN Prime Index Futures 
India Nifty50 Futures 
10% 
15％ 
20％ 
Nikkei 225 VI Futures 
10pts 
Normally, expanded by 5 points(unlimited number of times) 
DJIA Futures 
7% 
13％ 
20％ 
Index Options 
Nikkei 225 Options 
11% 
14％ 
17％ 
TOPIX Options 
Dividend Index Futures
The price limit range
 The price limit range for Nikkei Stock Average Dividend Point Index shall be 50 JPY up and down from the reference price and will not be periodically updated.
 The price limit range forTOPIX Dividend Index and TOPIX Core30 Dividend Index shall be 5 points up and down from the reference price and will not be periodically updated.
Expansion of upper or (and) lower price limits when a Circuit Breaker is triggered
 Normally, the upper or lower price limit range for Nikkei Stock Average Dividend Point Index will be expanded by 25 yen (no limitation on how many times the price limit range will be expanded).
 Normally, the upper or lower price limit range forTOPIX Dividend Index and TOPIX Core30 Dividend Index will be expanded by 2.5 pts (no limitation on how many times the price limit range will be expanded).
Category 
Normal 
Expansion 
Nikkei Stock Average Dividend Point Index 
JPY 50 
Normally,expanded by 25 yen
(unlimited number of times) 
TOPIX Dividend Index 
5pts 
Normally,expanded by 2.5 pts
(unlimited number of times) 
TOPIX Core30 Dividend Index 
5pts 
Normally,expanded by 2.5 pts
(unlimited number of times) 
Individual Options
With respect to price limits for Individual options Contracts, the price limit range will be calculated by multiplying the reference price for price limits of an underlying security on the designated market by 25%, and the range will be recalculated daily.
JGB Futures and Options
The price limit range
The price limit range of JGB Futures and Options shall not be periodically undated as in Index Futures and Options, but will be set as in the table below.
In the case where a Circuit Breaker is triggered, trading will be halted and the price limit range will be expanded.
Expansion of upper or (and) lower price limits when a Circuit Breaker is triggered
The expansion of JGB Futures and Options shall be conducted only once (this differs from Index Futures and Options).
Category 
Normal 
Expansion 
5year JGB Futures 
JPY 2.00 
JPY 3.00 
10year JGB Futures 
JPY 2.00 
JPY 3.00 
20year JGB Futures 
JPY 4.00 
JPY 6.00 
mini 10year JGB Futures 
JPY 2.00 
JPY 3.00 
Options on JGB Futures 
JPY 2.10 
JPY 3.00 
Circuit Breaker Rule(SCB)
The circuit breaker rule is applied to temporarily halt trading in order to allow investors to calm down when the market is overly volatile.
Conditions for
CB Trigger 
Below applies with respect to the leading contract month of future contracts.
In the case where a buy (sell) order is placed (or executed) at the upper (lower) price limit for the central contract month of a futures contract (excluding mini contracts), and no subsequent trades are executed outside 10% of the daily price limit range (JGB futures will be applied the dynamic circuit breaker range.) from said upper (lower) price limit in the next minute, the trading of futures whose underlying is the same as this central contract month (including mini contracts) will be suspended and the upper (lower) daily price limit range will be expanded.
Price limits will be expanded in stages according to CB trigger situation.
Price limits will be expanded during the trading halt. 
Contracts (Issues) Subject to Trading Halt 
In cases where the criteria for the CB trigger are met, trading of the issues below will be halted.
 All future contract months
 All option contracts which have the same underlying index
 The strategy trades related to (1)
 JNET trading of (1) and (2)

Conditions for Exception of Application 
 In the case where the above criteria is met within 20 minutes before the end of the regular session of the day (afternoon) or night session.
 For futures (excluding Nikkei 225 VI futures and dividend index futures),in the case where the circuit breaker criteria is triggered again after the daily price limits has been expanded to the 2nd expansion range.
 In cases where the Exchange deems that a trading suspension would not be appropriate in consideration of the trading conditions, etc.

Beginning of
Trading Halt 
The time that OSE determines on each occasion immediately after the criteria for CB trigger are met
(note)
 ･Due to that halt operation is carried out immediately after CB criteria is met, there is a slight time difference between the time CB criteria is met and the actual initiation of halt.

Duration for
Trading Halt 
10 minutes 
Method for Resumption 
After the duration for a trading halt, trading will be resumed by the Itayose method with the price limit expanded. 
Method for Resumption 
Renewed on a trading day basis 
Please see the following for the description of triggering CB and expanding price limits in stages.