Is the auction procedure different for rolling segment and trade-to-trade segment?
Yes. In rolling / normal segment the auction price is calculated based on the following formula : Highest price prevailing in the Exchange from the first day of the relevant trading period till the day of closing out, or 10 or 20% above the closing price on the auction day, whichever is higher. In case of Trade to Trade or Trade for Trade segment, the auction price is calculated based on the following formula: For NSE 20% above the closing price of the scrip on the T+1 day. For BSE Highest price prevailing in the Exchange from the first day of the relevant trading period till the T+2 day, Or 10% above the closing price of the payout (T+2) day, whichever is higher.