What types of securities are exempt from both Stamp Duty and Stamp Duty Reserve Tax (SDRT)?

The correct choice relates to AIM/NEX shares being exempt from both Stamp Duty and Stamp Duty Reserve Tax (SDRT). The Alternative Investment Market (AIM), part of the London Stock Exchange, is designed for smaller, growing companies. One of the key features of AIM is the encouragement of investment in these smaller companies. To promote investment, shares traded on AIM are generally exempt from the usual Stamp Duty and SDRT that would typically apply to share transactions.

This exemption serves multiple purposes: it reduces transaction costs for investors, thereby making it more attractive for raising capital and enhancing liquidity for AIM-listed companies. By eliminating these taxes, the governing authorities aim to stimulate growth and investment in smaller enterprises, which might otherwise struggle to attract capital.

In contrast, US government bonds, certificated shares, and corporate convertible loans do not enjoy the same exemptions. While certain types of securities might have different tax implications, the specific features and objectives of AIM shares clearly delineate their favorable status in terms of tax exemptions. Therefore, understanding the unique role and structure of AIM/NEX shares within the investment landscape explains why this choice is the correct answer.