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Relevant Laws

Title：Operating Rules of the Taiwan Stock Exchange Corporation (2022.04.28)
Article 70     A trade shall be considered to be an odd-lot trade if the volume of stocks traded is less than one trading unit. The methods for trading in such stocks shall be separately drafted by the TWSE and reported to and approved by the Competent Authority before its implementation.
    The TWSE may appoint designated securities dealers to concurrently operate the business of trading in odd-lot shares, and publicly announce such decision. The same procedure shall be applicable with amendments to the same.
    A securities dealer may not refuse the appointment referred to in the preceding paragraph.
Article 71     A trade shall be a treated as a block trade if any of the below-listed circumstances is present in a single buy order or sell order:
  1. Block trade of a single security: refers to a single buy order or sell order for at least 500 trading units of a single listed security.
  2. Block trade of a basket of stocks: refers to a single buy order or sell order for at least five listed stocks with a total value of at least NT$15 million.
    If the conditions specified in subparagraph 1 of the preceding paragraph are not met but the total value of the single buy or sell order is at least NT$15 million, the trade may be treated as a block trade of a single security.
    Regulations regarding block trades shall be separately adopted by the TWSE and implemented after being filed with the Competent Authority for final approval.