What is the greenshoe mechanism?

Greenshoe refers to an over-allotment and post-listing stabilization arrangement in an IPO.

Plain meaning

A greenshoe, or over-allotment option, usually lets underwriters allocate extra shares and lets a stabilizing manager conduct stabilization within the allowed period.

Why it matters

It may provide some early downside support, but it is not a price guarantee. Execution, trading volume and demand still matter.

How to read it

Check whether an over-allotment option exists, who the stabilizing manager is, the borrowing arrangement, offer size, grey market and first-day turnover.

How it appears here

HK IPO AI treats greenshoe support as one short-term supply-demand factor, not as a standalone investment signal.

Common mistakes

Assuming greenshoe prevents all breaks below offer price.
Ignoring supply-demand after the stabilization period.
Looking only at whether greenshoe exists without offer size and liquidity.