What happens if the shares are not bought in the auction?

If the shares are not bought at the auction i.e. if the shares are not offered for sale, the Exchange squares up the transaction as per SEBI guidelines. The transaction is squared up at the highest price from the relevant trading period till the auction day or at 20 per cent above the last available Closing price whichever is higher. The pay-in and pay-out of funds for auction square up is held along with the pay-out for the relevant auction.