Post-Trade Transparency
Post-trade transparency refers to the public dissemination of information about completed transactions — including price, volume, time of execution, and counterparty type — after a trade has been executed, enabling market participants to assess prevailing market conditions and regulators to monitor trading activity.
Post-trade transparency is one of the two pillars of market transparency, the other being pre-trade transparency (the public display of pending orders in the order book). While pre-trade transparency helps participants make informed decisions before trading, post-trade transparency ensures that all market participants — including those who did not participate in a transaction — can observe the prices and volumes at which trades occurred.
The primary mechanism for post-trade transparency on Indian exchanges is the Trade Reporting system, which disseminates the Last Traded Price (LTP), Last Traded Quantity (LTQ), and total traded volume for each security in real time. This data is broadcast via the exchange's data feeds and forms the basis for time-and-sales displays on trading platforms, real-time index calculation, and intraday price charts.
For exchange-traded instruments on NSE, post-trade transparency is comprehensive and immediate: every executed trade is reported to the exchange, which broadcasts the trade details within milliseconds to all market data subscribers. This level of transparency is a function of NSE's fully electronic, order-driven market architecture — there are no negotiated trades conducted off-exchange without subsequent reporting.
The picture is more complex for off-market transactions and large block deals. SEBI's framework requires that block deals executed on the separate Block Deal Window on NSE and BSE be reported immediately and publicly disclosed, including the name of the security, price, quantity, and the fact that they were block transactions. Bulk deals exceeding 0.5 percent of a company's total shares must similarly be disclosed to the exchanges by end of day.
SEBI's reporting obligations under its Market Infrastructure Institution (MII) framework require exchanges to maintain detailed audit trails of all trades, including timestamps at microsecond resolution, counterparty identities, order IDs, and the sequence of order events leading to each execution. These records are used in surveillance and investigation of potential manipulation, front-running, or insider trading.
For bond and OTC instruments, post-trade transparency has historically been lower in India than for exchange-traded equities. SEBI and RBI have progressively expanded reporting requirements for corporate bond trades through the BSE Bond Platform and NSE EMERGE to improve price discovery in fixed income markets.