What does top hammer mean in a Hong Kong IPO?

Top hammer refers to applying at the maximum public offer application tier.

Plain meaning

The highest application tier in the public offer is often called top hammer. It usually sits in Pool B, uses substantial capital and may receive more lots, but not always efficiently.

Why it matters

Top hammer applications affect demand statistics and large-ticket competition. For investors, the key question is capital efficiency, not only allocation size.

How to read it

Read it with Pool B supply, oversubscription, clawback, guaranteed allocation tier and allotment ratio. A steep allocation curve can make extra capital inefficient.

How it appears here

Allotment detail pages show top tiers, Pool B head tiers and expected lots so the marginal benefit near top hammer can be compared.

Common mistakes

Assuming top hammer always produces the best return.
Ignoring capital lock-up and margin cost.
Forgetting that Pool B can also be highly competitive.