Market Surveillance

Market surveillance is a vital regulatory mechanism deployed to maintain market integrity, ensure transparent price discovery, and prevent systemic risks. SEBI derives its surveillance mandate from Section 11(1) of the SEBI Act, 1992, which empowers the regulator to protect investor interests and regulate the securities market. The Integrated Surveillance Department (ISD) within SEBI actively spearheads these operations, working closely with Market Infrastructure Institutions (MIIs) like stock exchanges (NSE, BSE) and clearing corporations.

Joint Surveillance Mechanism

To coordinate monitoring across multiple asset segments, SEBI operates a unified framework with stock exchanges via Joint Surveillance Meetings. These interventions align surveillance policies across the cash, equity derivatives, and currency derivatives segments. A consolidated regulatory update, the SEBI Master Circular on Surveillance of Securities Market, codifies these multi-layered operational rules for systemic reference by intermediaries.

Technology Infrastructure for Surveillance

Data-Driven Detection Platforms

SEBI maintains continuous oversight over millions of daily orders and trades through specialized technological systems. These systems capture structural anomalies, volume spurts, and pattern deviations in real time.

• Integrated Market Surveillance System (IMSS): This centralized tech stack aggregates transactional data across various stock exchanges, clearing corporations, and depositories. IMSS generates cross-market alerts to isolate macro-level market abuses, wash sales, and synchronized trading across independent brokers.
• Data Analysis and Algorithmic Tracking Platforms: These analytical setups parse complex data structures, including multi-broker loops, concentrated client activities, and algorithmic order behaviors. They are engineered to flag algorithmic anomalies and unauthorized advisory platforms.

Specialized Preventative Surveillance Frameworks

Graded Surveillance Measure (GSM)

The Graded Surveillance Measure targets mainboard and SME stocks that demonstrate abnormal price fluctuations or volatility disproportionate to their underlying financial fundamentals. The framework applies incremental restrictions across multiple stages to protect retail investors from pump-and-dump manipulation.

Enhanced Surveillance Measure (ESM)

Introduced specifically for small-cap and low-cap stocks with a market capitalization below ₹500 crores, the ESM functions in a two-stage mechanism to check extreme volatility. Stage I mandates a 100% margin requirement and moves the security into the T2T settlement mode with a narrow 2% or 5% price band. Stage II shifts the stock into a periodic call auction mechanism, preventing open continuous matching.

Additional Surveillance Measure (ASM)

Unlike GSM, which flags weak financials coupled with high price spurts, the ASM framework isolates stocks based on objective parameters like high-low price variation, delivery percentage, client concentration, and close-to-close price variations over specific rolling periods. It functions across two main categories:

• Long-Term ASM: Operates across four distinct stages where margins are sequentially hiked up to 100%, and price bands are strictly capped.
• Short-Term ASM: Triggered by sudden 2-to-5-day volume spikes or intraday variances, resulting in instant margin increases to cool off leverage.

Structural Risk Control and Transactional Interventions

Circuit Breakers and Price Bands

To cushion the market against sudden panic or macro-economic shocks, SEBI utilizes a dual price-containment system.

• Individual Stock Price Bands: Daily limits capped at 2%, 5%, 10%, or 20% based on the security’s derivative status and historical volatility.
• Market-Wide Circuit Breakers: System-wide trading halts triggered by movements of 10%, 15%, or 20% in either the Nifty 50 or the BSE Sensex. The duration of the halt varies depending on the time of the day the trigger is breached.

Circuit Breaker Interruption Matrix

The following structure highlights how a market-wide halt operates across different time windows:

• 10% Breached: Before 1:00 PM halts the entire equity cash and derivatives market for 45 minutes; between 1:00 PM and 2:30 PM halts trading for 15 minutes; at or after 2:30 PM causes no market halt.
• 15% Breached: Before 1:00 PM halts the market for 1 hour and 45 minutes; between 1:00 PM and 2:30 PM halts trading for 45 minutes; at or after 2:30 PM halts the market for the remainder of the day.
• 20% Breached: Halts trading completely for the rest of the business day, regardless of the time of occurrence.

Mitigation of Modern Algorithmic and Derivative Risks

• High Order-to-Trade Ratio (OTR) Penalties: To prevent algorithmic platforms from flooding exchange engines with hyper-frequent quotes that strain market infrastructure, SEBI penalizes trading members maintaining an unnaturally high ratio of modified/cancelled orders relative to executed trades.
• Order Spoofing Disincentives: Submitting large buy or sell orders with the intent to cancel them before execution to fabricate false market depth triggers automatic Additional Surveillance Margins on the defaulting member.
• Reversal Trade Cancellation Mechanism (RTCM): Automatically isolates and reverses non-genuine transactions where identical buy and sell contracts are executed between the same set of counterparties within short intervals to artificially inflate volumes.

Intermediary Accountability and Institutional Mechanisms

Surveillance-Related Lapses (SRL) Framework

The regulatory architecture holds Market Infrastructure Institutions directly accountable for maintaining uncompromised vigilance. Under the SRL framework, if an exchange or clearing house delays or fails to execute surveillance instructions, report abnormal transaction loops, or issue timely alerts, SEBI levies financial disincentives and structural penalties against the institution.

Broker-Level Fraud Detection Architecture

Trading members and stockbrokers are legally required to establish a comprehensive institutional mechanism to catch domestic trade irregularities. Compliance officers must monitor:

• Client Code Modifications (CCM): Strict penalty structures govern the modification of client identities post-trade execution to eliminate tax evasion or profit-shifting practices.
• Rumour Verification and Media Clarifications: If a sudden spurt in trade volume or price coincides with unauthenticated news in mainstream or social media, the listed entity and its associated brokers must formally verify or deny the rumor within a rigid turnaround time.

Core Market Abuses Monitored by SEBI

Insider Trading Controls

Governed under the SEBI (Prohibition of Insider Trading) Regulations, this mechanism actively blocks individuals holding Unpublished Price Sensitive Information (UPSI) from executing trades. The compliance machinery executes a Trading Window Closure during corporate financial closures, extending the restriction to immediate relatives of designated institutional insiders.

Market Manipulation Techniques Under Vigilance

• Front-Running: Occurs when a broker or fund manager executes an order for personal gain ahead of a large institutional block deal that is guaranteed to move prices.
• Circular Trading: A manipulative loop where a closed group of operators buy and sell a specific stock among themselves to create an illusion of high liquidity, trapping retail buyers.
• Pump and Dump: Artificially inflating the price of a micro-cap stock via biased advisories or bulk buy volumes (the pump) before selling off concentrated holdings at peak value (the dump).

UPSC Prelims High-Yield Facts

Key Capital Market Pointers

• Market-Wide Position Limits (MWPL): The maximum number of derivative contracts that can remain open at any given point for an underlying stock across all exchanges. If open interest crosses 95% of the MWPL, the stock enters a ban period where market participants can only reduce existing positions.
• Periodic Call Auction Session (PCAS): Thinly traded or highly illiquid stocks are shifted out of continuous trading into a call auction system to determine fair prices. A stock qualifies if its average daily turnover over two quarters falls below ₹2 lakhs.
• SCORES Platform Integration: The SEBI Complaints Redress System is integrated with surveillance loops; frequent investor complaints regarding specific corporate groups instantly trigger stock-specific alert generations within the IMSS.
• Trade-to-Trade (T2T) Delivery Rule: Stocks categorized into the T2T segment require mandatory gross delivery settlement. No intraday squaring-off or leveraging is allowed, meaning every purchase requires full funding and every sale requires physical delivery of shares.