Surveillance measures are safeguards that stock exchanges, working with the market regulator, the Securities and Exchange Board of India (SEBI), apply to individual stocks that show unusual price moves or unusual trading activity. When a stock comes under surveillance, trading in it becomes deliberately slower and more cautious (higher margins, delivery-only settlement, or tighter price bands) so that ordinary investors don't get swept up in a manipulated or overheated rally.
Why do exchanges need surveillance at all?
Prices on an exchange are set by buyers and sellers, and most of the time that works well. But sometimes a stock's price runs far ahead of anything happening in the company. A 300% rise in a few weeks with no news, for example. That pattern often means speculation or manipulation, and the people who get hurt are latecomers who buy near the top.
Exchanges run automated systems that watch every stock for signals like sharp price swings, sudden volume spikes, and a price that has drifted far from the company's fundamentals. When a stock trips these filters, it is moved into a surveillance framework. Think of it as a speed breaker, not a roadblock: you can still trade the stock, but the rules force everyone to slow down and think.
What are the main surveillance frameworks?
The frameworks you'll see mentioned on exchange lists are:
| Framework | Rough idea |
|---|---|
| ASM | Extra checks on stocks with unusual price or volume activity. Read What is the Additional Surveillance Measure (ASM)? |
| GSM | Graded restrictions on fundamentally weak, often very low-priced stocks. Read What is the Graded Surveillance Measure (GSM)? |
| ESM | A framework focused on smaller companies. Read What is the Enhanced Surveillance Measure (ESM)? |
| T2T | A segment where every trade must result in delivery. Read What is a Trade-to-Trade (T2T) stock, and how can I trade it? |
The exchanges publish and update the lists of stocks under each framework regularly, and a stock can move in and out as its behaviour changes.
What actually changes for me when a stock is under surveillance?
Depending on the framework and stage, one or more of these applies:
- Higher margins. You may need to bring in much more money upfront (sometimes the full trade value) which removes leverage from the trade.
- Delivery-only trading. The stock may move to the Trade-to-Trade segment, so Intraday is blocked and every buy must be paid for in full.
- Tighter price bands. The daily range the price can move in is narrowed, which limits how fast the stock can spike or crash in a single day.
- Less frequent matching. In some stages, orders match only in periodic auctions rather than continuously.
Suppose Kavita sees Sundar Textiles doubling in a month and wants to buy ₹50,000 worth on Intraday. If the stock has entered a surveillance stage, she'll be shown its status before she can place the order, and Intraday may not be available at all, leaving her to place a Delivery order with the full ₹50,000. That friction is intentional. It filters out momentum-chasing and leaves only buyers willing to actually own the shares.
Will I know before I place the order?
Yes. SEBI requires every broker (Rupeezy included) to disclose a stock's surveillance status to you before you place the order, so you're told upfront rather than discovering it through a rejection or an unexpected margin figure.
That means a surveillance stage is never meant to be a surprise. If you're about to trade a stock and see a surveillance flag on it, treat it as the exchange's own caution notice, and read it before deciding, not as an error.
Does surveillance mean the stock is bad?
Not automatically. Surveillance is a flag, not a verdict. It tells you the exchange has seen activity in the stock that deserves caution. Some stocks exit surveillance and trade normally again; others keep sliding. Either way, the measure exists to protect you. It's the exchange saying "look closer before you leap", not punishing you for being interested.
Things to keep in mind
- Surveillance lists are reviewed and revised regularly. A stock's status today can change at the next review, in either direction.
- You don't have to find this out the hard way. The surveillance status is disclosed to you before you place the order, not after it's rejected.
- The exact criteria, stages, and margin percentages are set by the exchanges and SEBI and are revised from time to time. Always treat the exchange's current list as the source of truth.
- A stock under surveillance can still fall (or rise) sharply within its allowed band; the measures reduce risk, they don't remove it.
Read next
What is the Graded Surveillance Measure (GSM)? — The first named framework, aimed at thinly traded stocks.