2.1.1 An error trade occurs when a transaction is effected on the Trading System as a result of an error in the entry of a bid or offer that was subsequently matched.

2.1.2 Subject to sub-paragraph 2.1.4, the Exchange will only exercise its discretion to:

2.1.3 However, there will be no trade price adjustments for:

2.1.4 Notwithstanding sub-paragraph 2.1.2 and 2.1.3 above, the Exchange retains the power to cancel an error trade partially or fully or adjust the trade price of an error trade if, in the Exchange's opinion, it is desirable to do so, to protect the financial integrity, reputation or interests of the Markets established or operated by the Exchange. The Exchange's discretion to adjust the trade price or cancel a trade, either partially or fully, may be exercised even where the trade is within the error trade price range.

2.1.5 For the avoidance of doubt, error trades will not be cancelled except as provided for under sub-paragraphs 2.1.3 and 2.1.4.

2.1.6 A Member shall take all necessary steps and exercise due diligence in monitoring trades done for any errors.

2.1.7 A Member requesting an error trade cancellation or price adjustment shall promptly take all necessary mitigating actions to minimize the losses suffered.

2.2.1 The Exchange will approve a list of designated Futures Contracts as set out in Appendix A. For designated Futures Contracts traded when the underlying cash market is open for trading, the dynamic futures reference price shall be the average of the high and low traded prices in the minute before the error trade. If there are no trades in the minute before the error trade, the dynamic futures reference price will be determined by theoretical pricing models using, among other variables, the latest cash index value before the error trade.

Refer to Appendix A of Regulatory Notice 4.1.8.

2.2.2 If an error trade occurs in connection with a Futures Contract which is not a designated Futures Contract, or when the error trade occurs in connection with a designated Futures Contract when the underlying cash market is not open for trading, the opening price shall be assigned as the static futures reference price. If the opening price is not available, the Exchange may use other prices that it thinks in its discretion are reasonable. For instance, the Exchange may use the previous day's closing price.

2.2.3 The Exchange computes the error trade price range for a Futures Contract by taking into account the trading and closing prices of the Contract or any other relevant information (for example, relevant market information in a recent three (3) month period). The upper and lower limits of the error trade price range are determined in relation to the relevant futures reference price.

2.2.4 The following is an example for the calculation of the dynamic futures reference price in relation to a designated Futures Contract.

For designated Futures Contracts, it is possible to establish a fairly accurate dynamic reference price when the underlying cash market is open. Therefore, the Exchange will apply a smaller error trade price range, with reference to the dynamic futures reference price. A dynamic futures reference price may be calculated as follows:

2.2.5 The following is an example for the calculation of the error trade price range in relation to a designated Futures Contract.

This example uses the Yen-denominated SGX Nikkei Stock Average Futures Contract. Based on an evaluation of historical data the Exchange could set the following:

Error Trade Price Range of +/- 50 points for the spot quarter month

Error Trade Price Range of +/- 100 points for other contract months

The spot quarter month has a narrower error trade price range because its dynamic futures reference price, calculated using market traded prices, will be relatively accurate. The other contract months have a wider error trade price range because the dynamic futures reference price would likely have a theoretical component. A wider range is needed to ensure that bona-fide trades do not fall within the error trade price range. The Exchange may periodically adjust the error trade price range to reflect prevailing market conditions. DMC will broadcast the necessary information to Members in accordance with sub-paragraph 2.2.10.

Based on the dynamic futures reference price, an erring party's losses from error trades should be limited to fifty (50) points (¥25,000) per lot in the spot quarter month or one hundred (100) points (¥50,000) per lot in other contract months.

2.2.6 The Exchange will approve a list of designated Option Contracts as set out in Appendix A. The option reference price for designated Option Contracts when the underlying cash market is open for trading shall be determined by theoretical pricing models using:

2.2.7 The Exchange computes the error trade price range for designated Option Contracts when the underlying cash market is open, by taking into account the trading and closing volatility of the Option Contract or any other relevant information (for example, relevant market information in a recent three (3) month period) to determine a volatility range. The Exchange may, in its discretion, determine different volatility ranges for the purpose of calculating the error trade price range. The option error trade price range shall be determined by theoretical pricing models using, among other variables, the dynamic futures reference price of the underlying Futures Contract and the volatility range. The Exchange may adjust the trade price of an error trade involving designated Option Contracts when the underlying cash market is open for trading in accordance with sub-paragraph 2.1.2(b).

2.2.7A If an error trade occurs in connection with an Option Contract which is not a designated Option Contract, or when the error trade occurs in connection with a designated Option Contract when the underlying cash market is not open for trading, the opening price shall be assigned as the static option reference price. If the opening price is not available, the Exchange may use other prices that it thinks in its discretion are reasonable. For instance, the Exchange may use the previous day's closing price. The Exchange computes the error trade price range for such Option Contracts by applying a percentage to the option reference price referred to in this sub-paragraph. The Exchange may cancel an error trade involving Option Contracts referred to in this paragraph in accordance with sub-paragraph 2.1.2(a).

2.2.8 The following is an example for the calculation of the error trade price range in relation to a designated Option Contract.

For designated Option Contracts, it is possible to establish a fairly accurate dynamic futures reference price when the underlying cash market is open. The option error trade price range is calculated using a theoretical option pricing model with variables including the dynamic reference price of the underlying Futures Contract and a volatility range.

This example uses the SGX Option Contract on Nikkei Stock Average Futures. The Exchange could set the following volatility range (with reference to the previous day settlement implied volatility):

	Within 1,000 points from at-the-money	Other Strikes
Spot Month	+/- 4%	+/- 6%
Other Months	+/- 5%	+/- 8%

The option reference price will be calculated using the option pricing model with variables including the dynamic futures reference price of the underlying Futures Contract and the previous day settlement implied volatility.

In addition, the option error trade price range is subject to a minimum level (to prevent frivolous price adjustments) and a maximum level (to cater to special circumstances for Option Contracts).

This example uses the SGX Option Contract on Nikkei Stock Average Futures. Based on evaluation of its historical data, the Exchange could set:

Maximum price range of	+/- 100 points for contracts with 6 months or less to expiry
	+/- 200 points for other contract months
Minimum price range of	+/- 30 points

The Exchange may apply the maximum price range to all Option Contracts that are more than 1,500 points in-the-money and all expiring options on the Monday of the week of expiration to the Last Trading Day. Deep in-the-money Option Contracts have high delta and thus the price change largely mirrors the price change of the underlying. It is thus appropriate to use a fixed error trade price range. In addition, as the Option Contract approaches expiry, small changes in traded option prices cause relatively large changes in traded implied volatility. The result is that the volatility range may not be sufficient to encompass the volatility changes near the expiry of the contract. Based on historical data, the traded implied volatility of the Option Contract would start to change rapidly during the week of expiration. Hence, the maximum price range will generally be imposed during this period. The Exchange may adjust, with prior notice, the maximum price range and applicable circumstances as market conditions change.

2.2.9 Notwithstanding sub-paragraphs 2.2.1 to 2.2.8 above, the Exchange retains the discretion to take into account other relevant market information to determine the error trade price range or the reference price, and determine error trade price ranges using any other methodology, if, in the Exchange's opinion, it is desirable to do so to protect the financial integrity, reputation or interests of the Markets established or operated by the Exchange.

2.2.10 The Exchange will notify all Members of the error trade price range in terms of absolute prices or percentages, as the case may be, on a daily basis. The Exchange will notify all Members of the volatility range on a quarterly basis. In addition, the Exchange will inform all Members, via circular, of any changes in the size of the error trade price range or volatility range at least one (1) week before effecting such change.

2.3.1 The Exchange may consider the following factors when deciding whether to adjust the trade price or cancel any trades:

2.4.1 Under sub-paragraph 2.1.3, certain error trades may be cancelled if the counterparties consent to the cancellation. The terms of the cancellation of the error trade (including any compensation payable) are for the relevant parties to agree on. The Exchange will not be involved in this process or in any disputes arising from this process.

2.5.1 A trade review administration fee ("Administrative Fee") of SGD$500 will be imposed on every request received to adjust the price of or cancel an error trade.

If the Exchange deems the error trade to be serious, it may charge a higher amount than the Administrative Fee.

2.5.2 The Member shall pay the Administrative Fee to the Exchange within such time specified by the Exchange following its determination of the fee.

2.6.1 The Member's authorised co-ordinator¹ intending to report an error trade shall:

2.6.2 Once an error trade has been brought to the attention of the DMC in accordance with this Regulatory Notice, the following procedures will apply:—

2.6.3 The Exchange will not consider any requests to review its decision following an announcement under 2.6.2(c).