The Act Governing Bills Finance Business Article 24

A Bills Finance Company trading in Short-Term Bills or bonds, as referred to in Article 21, Paragraph 1, shall publicly disclose the bid and offer prices pursuant to rules [to be] issued by the Competent Authority.A Bills Finance Company which has committed to a price and/or quantity shall execute the trade at said price and in said quantity.The preceding two paragraphs shall also apply to financial institutions concurrently operating a Bill House business and trading in Short-Term Bills.
中文原文 票券金融管理法第24條
票券金融公司辦理第二十一條第一項短期票券或債券之自營業務,應依主管機關規定之方式揭露買賣價格。
票券金融公司對買賣價格及額度已承諾者,負有依該價格及額度進行交易之義務。
前二項規定,於兼營票券金融業務之金融機構辦理短期票券之自營業務,準用之。

English translation for reference only; the Chinese text prevails. Not legal advice.