The grey market premium of Concord Enviro IPO was Rs 55 as of 5:03 am on December 24, indicating a 7.85% gain per share.The Concord Enviro IPO garnered decent interest from investors, with total bids for 5,35,33,347 shares against the 50,15,356 shares on offer.Investors can check the allotment status on BSE, Link Intime India, or the NSE website with their details.The listing date for Concord Enviro IPO is fixed as Friday, December 27 on BSE and NSE.