Additional Surveillance Measure
Regulation & taxAlso called: ASM
An exchange framework that applies tighter trading conditions to a security on the basis of its price and volume behaviour, in a short-term and a long-term form.
In plain terms
It reacts to how the share has traded, not to anything the company did. The bite is 100% upfront margin, which usually reaches you as a rejected order or a margin call before you have read the circular.