Capping is inordinate sell orders on sell side to suppress the...

Capping is inordinate sell orders on sell side to suppress the SP and discourage buying. Can be simply refilling sell side or stacking sell side.

Capper makes money because in this context Capper is likely to have bought the shares quite cheap. So they make a capital gain.

Because the capper has then crystallized a capital gain they also have much more money to play with when it comes to making a T/O offer.

And because they have capped the SP by selling, the premium they might offer on the SP by making a T/O offer would be less than if they had not capped the stock.

Just my opinion, do your own research