Graded Surveillance Measure (GSM)
A SEBI framework that applies escalating trading restrictions to stocks whose price movements are disproportionate to their underlying financial fundamentals, acting as a deterrent against price manipulation.
Definition
Graded Surveillance Measure (GSM) is a joint regulatory framework introduced by SEBI, NSE, and BSE to identify and restrict trading in stocks that show unusual price appreciation without corresponding improvement in the company's financial performance. Stocks flagged under GSM are moved to a trade-to-trade (T2T) settlement segment and subjected to progressively heavier margin requirements and trading frequency restrictions across six stages. The framework targets primarily small- and micro-cap stocks that are susceptible to pump-and-dump schemes and is distinct from the Additional Surveillance Measure (ASM), which covers a broader set of volatility and liquidity parameters.
Why it matters
For traders, a stock entering the GSM list becomes operationally difficult to trade and hedge. Intraday positions are not allowed — every buy must be settled with actual delivery and every sell requires shares in the demat account, eliminating the ability to square off within the same session. This makes it impossible to run any standard intraday or derivative strategy on a GSM stock. Brokers often refuse to allow fresh buying in GSM stocks at higher stages, and the increased margin requirements can tie up substantial capital for anyone already holding a position.
Investors who hold GSM-listed stocks may find that the liquidity dries up sharply once the designation is announced, making it difficult to exit even if they wish to. The reduced trading window at higher GSM stages (once a week or once a month) means price discovery is severely impaired and bid-ask spreads can widen dramatically on the permitted trading day.
From a regulatory standpoint, GSM is also a signal to the broader market that the exchange and SEBI are scrutinising the stock for potential manipulation or fraudulent activity, which itself tends to drive away legitimate institutional participants.
How it works
Exchanges assess all listed securities periodically against a set of financial and price-movement criteria — including the ratio of price increase to earnings, book value, and revenue growth. Stocks that breach defined thresholds are placed in GSM Stage I, where they move to T2T settlement and attract a 50% additional surveillance margin. If the anomaly persists after review, the stock escalates to Stage II (100% margin, weekly trading), and further through Stages III to VI, where margins reach 200% and trading may be restricted to once a month with a five-year lock-in for fresh buyers at the highest stage. Stocks are reviewed quarterly and can be moved down stages or removed from GSM entirely if their fundamentals improve or prices correct to justified levels.
Example
Suppose a hypothetical small-cap company listed on BSE reports annual revenues of ₹10 crore and net losses, yet its stock price triples from ₹50 to ₹150 within three months with no material news. BSE's surveillance system flags the disproportionate price-to-fundamentals ratio and places the stock in GSM Stage I. Fresh buyers must now pay 50% margin upfront and cannot net off the same day. If the stock continues rising in subsequent quarterly reviews, it escalates to Stage II, where trading is restricted to Mondays only, making it extremely difficult for retail investors who bought on the way up to exit their positions.
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