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Article 1     These Rules are specially promulgated to maintain orderly trading of Taiwan Stock Exchange Stock Index Futures contracts ("the Contracts") at the Taiwan Futures Exchange Corporation ("TAIFEX") and ensure security and fairness in trading of the Contracts.
Article 2     In addition to complying with the Futures Trading Law and related laws and regulations, and the rules and regulations, public announcements, and official letters of the TAIFEX, futures commission merchants ("FCMs") engaging in trading of the Contracts shall also comply with these Rules.
Article 3     The Chinese code for the Contracts is "T'ai Ku Ch'i Huo [in Chinese characters]" and the English code for the Contracts is "TX."
Article 4     The underlying of the Contracts is the Taiwan Stock Exchange Capitalization Weighted Stock Index (the TAIEX; hereinafter, the "index"). Matters related to the index calculation formula, sample stocks, base periods, and adjustments thereto shall be as prescribed by the Taiwan Stock Exchange Corporation (TWSE).
Article 5     The value of each contract shall be 200 New Taiwan Dollars multiplied by the TAIEX futures index.
Article 6     The minimum unit of price fluctuation ("tick") in trading orders for the Contracts shall be one index point. Each index point shall have a value of 200 New Taiwan Dollars.
Article 7     A futures trader may conclude rights and obligations under a contract before the delivery deadline by selling or buying back at the TAIFEX centralized exchange all or part of the volume of contracts originally bought or sold.
Article 8     The trading hours for the Contracts are as follows:
  1. Regular trading session: from 8:45 am to 1:45 pm on trading days of the TWSE. On the last trading day of the month in which the Contracts reach expiration, the trading hours are 8:45 am to 1:30 pm.
  2. After-hours trading session: from 3 pm on trading days of the TWSE to 5 am of the following day.
    If the TAIFEX has made other provisions regarding the trading hours referred to in the preceding paragraph, those provisions shall govern.
    When for any reason the TWSE announces a halt of trading before market opening of the Contracts , or when other factors influence trading of the Contracts, trading of the Contracts may be halted; when the TWSE announces a halt of trading during trading hours of the Contracts, trading of the Contracts will still continue. As necessary, however, TAIFEX may announce a halt of trading based on the current situation, and report the halt to the competent authority for recordation on the next business day.
    When the TWSE changes its trading hours, or when other factors influence trading of the Contracts, or in response to a suggestion by a futures industry association or the National Federation of Futures Industry Associations, the TAIFEX may change the trading hours for the Contracts after reporting to the competent authority for approval.
Article 9     Delivery months for the Contracts shall be the spot month and the next calendar month, and the three nearest of the quarter months of March, June, September, and December, for a total of five periods, listed and traded concurrently. The last trading day for contracts of any delivery month shall be the third Wednesday of the month in which such contract reaches expiry; trading of contracts reaching expiry shall cease at the close of the regular trading session on the last day of trading, and the last trading day shall be the final settlement day for a contract at expiry.
    If the last trading day referred to in the preceding paragraph falls on a holiday, or if trading may not proceed on that day due to a force majeure event, or if the TAIFEX has made other provisions, the next following business day shall be the last trading day.
    Trading in a new delivery month shall commence from the regular trading session of the next business day following the last trading day of an expiring contract.
    The TAIFEX may change the delivery months, initial trading days, final trading days, and final settlement days referred to in the preceding three paragraphs as it deems necessary after reporting to and receiving approval from the competent authority.
Article 10     Buy and sell orders for the Contracts, unless otherwise provided, will be matched automatically by computer. Matching shall be done by call auction at market opening, and then by continuous trading during market hours.
Article 11     Open positions held by traders are marked-to-market daily after the close of the regular trading session based on the daily settlement price published by the TAIFEX.
    The daily settlement price referred to in the preceding paragraph shall be set on the basis of the market information from the regular trading session and the following principles:
  1. It shall be the volume-weighted average price of all trades during the last minute before market close.
  2. If there is no trade price during the last minute before market close on the current day, the average of the highest unexecuted bid and lowest unexecuted ask quoted as of market close shall be taken as the daily settlement price.
  3. When there is no quoted bid price, the lowest quoted ask price shall be taken as the daily settlement price; when there is no quoted ask price, the highest quoted bid price shall be taken as the daily settlement price.
  4. When there is no quoted bid nor ask price for a distant-month futures contract, then the price difference between the settlement price of the spot-month futures contract and the settlement price of the distant-month futures contract on the previous business day shall be taken as the basis of calculation, whereby the sum of the current day's settlement price of the spot-month futures contract and the above price difference will be taken as the daily settlement price of the distant-month contract.
  5. If a daily settlement price cannot be determined under subparagraphs 1 to 4, or if the settlement price determined thereunder is obviously unreasonable, then the settlement price shall be set by the TAIFEX.
Article 12     The price limit for each trading session of the Contracts shall be 10 percent above and 10 percent below the daily settlement price of the preceding regular trading session.
Article 13     The final settlement price of the Contracts shall be set on the basis of the simple average price of the underlying index during the 30 minutes before market close on the final settlement day as provided by the TWSE. If the TWSE postpones market closing or matching, the TAIFEX may extend the aforementioned 30-minute sampling time.
    The calculation method under the preceding paragraph shall be separately prescribed by the TAIFEX.
Article 14     Cash settlement shall be adopted for settlement at expiry of the Contracts, with the futures traders on the final settlement day making payment or taking receipt of payment of the net amount of the price differential based on the final settlement price.
Article 15     An FCM engaging in brokerage trading of the Contracts shall, before accepting an order, first collect a sufficient trading margin based on the aggregate total of the brokerage trading orders, and from the date of the trades until the expiry of the settlement period shall mark to market on a daily basis the balance of equity in the position held by each client based on the daily settlement price and credit the aggregate total to the balance of the margin account of the client.
    When during the regular trading session the balance in a client's margin account is lower than the required maintenance margin, the FCM shall immediately notify the client to deposit within a specified time sufficient cash funds to cover the difference between the balance in the margin account and the total amount of the trading margins required for the client's open positions. If a client fails to make the deposit within the prescribed time limit, the FCM may offset the client's position on the client's behalf.
    The trading margin and the maintenance margin referred to in the preceding two paragraphs may not be lower than the publicly announced TAIFEX standard for the initial margin and the maintenance margin.
    The initial margins and maintenance margins publicly announced by the TAIFEX shall be calculated by multiplying the clearing margins calculated in accordance with the Taiwan Futures Exchange Corporation Standards and Methods of Collection for Clearing Margins on Taiwan Stock Exchange Stock Index Futures Contracts by the percentage prescribed by the TAIFEX.
Article 16     Except as otherwise provided, the total open positions in the Contracts held on either the long or short side of the market at any time by a futures trader plus the total open positions in TAIFEX Mini-TAIEX Futures Contracts, after translation by the one-to-four contract scale, held on the same side of the market by the futures trader, shall not in combination exceed the limits publicly announced by the TAIFEX.
    Every three months or as occasioned by market conditions, the TAIFEX will announce the applicable position limits under the preceding paragraph for that period, according to the below-listed levels, based on the daily average trading volume or outstanding volume, whichever is higher, of the Contracts plus the Mini-TAIEX Futures Contracts after translation by the one-to-four contract scale, with the benchmark set at 5 percent thereof for natural persons and 10 percent thereof for juristic persons. However, the lowest position limit shall be 1,000 contracts for natural persons, and 3,000 contracts for institutional investors:
  1. When the benchmark is 1,000 or more contracts, the position limit shall be the benchmark rounded down to the nearest integral multiple of 200 contracts.
  2. When the benchmark is 2,000 or more contracts, the position limit shall be the benchmark rounded down to the nearest integral multiple of 500 contracts.
  3. When the benchmark is 5,000 or more contracts, the position limit shall be the benchmark rounded down to the nearest integral multiple of 1,000 contracts.
  4. When the benchmark is 10,000 or more contracts, the position limit shall be the benchmark rounded down to the nearest integral multiple of 2,000 contracts.
    The position limit for a futures dealer shall be three times the position limit for a juristic person set out in paragraph 2.
    When the TAIFEX examines the applicable position limit levels, if the increase or decrease in the daily average trading volume or outstanding volume for the period, as compared to that at the time of the previous adjustment, does not exceed 2.5 percent, no adjustment shall be made even if the level for adjustment has been reached.
    Any raising of the position limit will take effect from the regular trading session of the next trading day following the TAIFEX announcement. Any lowering of the position limit will take effect from the regular trading session of the next trading day following the expiration of the next-nearest month contract that is already listed on the announcement date. The TAFIEX, however, may adjust this according to circumstances.
    When the position limit is lowered under the preceding paragraph, a position held by a trader before the effective date that surpasses the lowered limit may be held until the expiration date of the contract, provided that no new position may be added until the lowered limit has been complied with.
    The combined total open positions in the Contracts held by omnibus accounts are not subject to the limits in paragraph 2, with the exception of undisclosed omnibus accounts, which accounts are subject to the limits for institutional investors.
    An institutional investor may apply to the TAIFEX for relaxation of the limits on positions when based on hedging requirements.
    In addition to conforming to the provisions of this article, the limits on open positions held by traders of the Contracts shall also conform to the Taiwan Futures Exchange Corporation Regulations Governing Monitoring of Market Positions.
Article 17     An FCM engaging in proprietary or brokerage trading of the Contracts shall, unless otherwise provided, be subject to a limit of 100 contracts on the quantity of each trading quote.
    The TAIFEX may make adjustments to the limit on the quantity of trading quotes in the preceding paragraph in view of market trading conditions.
Article 18     Where any circumstance exists requiring suspension of trading or termination of listing of the Contracts as enumerated in [Article 31] of the Operating Rules of the Taiwan Futures Exchange Corporation, the TAIFEX shall make a public announcement 30 days before implementation, and all open positions shall be liquidated by the announced date of suspension of trading or termination of listing. Any positions still open on the announced date will be cleared at the daily settlement price for that date.
Article 19     These Rules and any amendments hereto shall take force following submission to and approval by the competent authority.