In an effort to improve the efficiency and transparency of major trade execution, the Securities and Exchange Board of India (SEBI) has released a circular for the implementation of a revamped block deal framework for stock exchanges. In order to prevent price manipulation, the block deal mechanism permits pre-negotiated agreements between parties to be carried out on the exchange during certain windows and under stringent guidelines. With a minimum order quantity of INR 25 crore, the price range will be ±3% of the reference price.
According to current standards, the minimum order size is INR10 crore, and the pricing range is ±1%. The order size was last adjusted by SEBI in October 2017. Since orders less than INR 25 crore will occur in the regular market, the higher threshold is anticipated to increase liquidity.
Two Specific Windows of Block Deal
There are two distinct times that block deals are available: 8:45 AM to 9:00 AM in the morning and 2:05 PM to 2:20 PM in the afternoon. According to the SEBI circular, the closing price of the stock the day before would serve as the reference price for executing block deals during the morning window.
The volume-weighted average price (VWAP) of trades made in the stock on the cash segment between 1:45 and 2:00 PM will serve as the reference price for the afternoon window.
Before the afternoon session begins, stock exchanges will compute and distribute the relevant VWAP between 2:00 and 2:05 PM. EffectiveDecember 7, 2025, the Sebi circular will be in force. According to the Sebi circular, the aforementioned clauses will also apply to the block deal window during the optional T+0 settlement cycle.
The 1st Framework was Introduced in 2005
As markets have expanded and block deal sizes have increased, regulations pertaining to these transactions have been re-examined. Since its initial release in 2005, the framework has undergone a number of reviews.
Although one of the exchanges had proposed a ±2% price range, a working committee on the matter had recommended a ±5% price range for the morning block transaction window and a ±3% price range for the afternoon trading window.
The working group had suggested raising the ceiling, citing the nearly threefold increase in benchmark indices over the previous ten years as justification. It was desirable to raise the restrictions since markets were becoming deeper and larger. 90% of block deals were larger than INR 14 crore, 75% larger than INR 26 crore, 60% larger than INR 50 crore, and 50% larger than INR 84 crore, according to SEBI’s analysis of the data from FY25 block deals at the NSE. Therefore, the order size needed to be reviewed.
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•Circular issued to enhance transparency and •Threshold increased from INR 10 crore to INR 25 •New rules applicable from December 7, 2025, •Block deal framework first introduced in 2005; |

