Regulations Governing the Offering and Issuance of Securities by Securities Issuers Article 31

When issuing convertible bonds, with the exception of listed or OTC companies, for which an underwriter shall be engaged to underwrite all bonds issued on a firm commitment basis, the bonds may not be underwritten and offered to the public.
中文原文 發行人募集與發行有價證券處理準則第31條
轉換公司債發行時,除上市或上櫃公司應全數委託證券承銷商包銷者外,不得對外公開承銷。

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