Hi James, thanks for your questions!

Institutional Sales is a front office role, in which the people served mainly deal with institutional clients (investors) on company's products / funds. Institutional investors may include fund houses, family offices, insurance companies, sizable conglomerates etc. I guess the job duties should be pretty straightforward. You may want to check the below JD for your further reference:

Source: https://www.hudson.hk/wp-content/documents/docs/salary-guides/financial-services_hongkong.pdf