The grey market premiums of Mamata Machinery and DAM Capital Advisors have cooled off, while Concord Enviro Systems has seen a notable rise.Mamata Machinery's IPO is expected to list at a 104% premium over its IPO price.DAM Capital Advisors' IPO may see a potential listing day gain of 54.77%.Concord Enviro Systems' IPO may result in a potential gain of 19.12% for the share allottees.