When any of the following circumstances applies to a TWSE secondary listed company, the TWSE may notify it by letter to make rectification or correction within a prescribed deadline. If it fails to make rectification or correction by the deadline, with no legitimate reason for its failure, then the TWSE, depending on the severity of the circumstance, may alter the trading method of the company's TWSE listed securities or delist the securities pursuant to Article 49-1 or Article 50-3 of the TWSE Operating Rules:
- The financial report publicly announced and filed is found after formal review to have not been filed pursuant to the requirements of laws and regulations.
- The TWSE secondary listed company fails to provide a reasonable explanation pursuant to Article 4 or does not provide an explanation within the deadline.
- The TWSE secondary listed company does not hire a CPA pursuant to Article 4, or the hired CPA does not provide an opinion or issue a special audit report, or material irregularities are found in the opinion or the special audit.
- The TWSE secondary listed company does not cooperate with the TWSE or the TWSE-designated professionals or institutions conducting special audits, or material irregularities are found after the special audit.