It's stated under Schedule 6 and 7 of the Capital Markets Services Act 2007.

An offer or invitation made to an individual–

(a) whose total net personal assets, or total net joint assets with his or her spouse,
exceed three million ringgit or its equivalent in foreign currencies, excluding
the value of the individual’s primary residence;

(b) who has a gross annual income exceeding three hundred thousand ringgit
or its equivalent in foreign currencies per annum in the preceding twelve
months; or

© who, jointly with his or her spouse, has a gross annual income exceeding four
hundred thousand ringgit or its equivalent in foreign currencies per annum in
the preceding twelve months

If you're unsure, call your broker for more details.
....or maybe to curb excess speculation? Not that I see this as a legitimate excuse

I have high hopes that this is only a trial and may probably open to retail investors at a later date. Even if this is open to retail investors, I'd rather put this on hold as probably it may just be like Hong Kong's GEM Market.