T2T, ASM, GSM and Circuit Limits Explained: What These Labels Mean for Your Stock

T2T, ASM, GSM and circuit limits show up on stock pages as small tags, and for many investors they look like background noise until an order is rejected or a stock they hold is locked and cannot be sold. A stock page may also carry a note that the stock is in a 5% circuit.

This guide explains what each label means, why exchanges apply it and what you should do differently when a stock carries one of them. Surveillance measures and stage lists are revised from time to time, so treat the exchange circular as the final word.

Click Here – Get Free Investment Predictions

T2T, ASM, GSM and Circuit Limits: The Four Labels in One View

Label	What it is	Main effect for you
T2T (trade-to-trade)	Segment where every trade is settled by delivery	No intraday squaring off, you must take or give delivery
ASM	Additional Surveillance Measure	Higher margin and trading curbs when price or volume looks unusual
GSM	Graded Surveillance Measure	Staged restrictions on stocks whose price is not backed by fundamentals
Circuit limit	Daily price band	Stock cannot move beyond the band in one session

What Is the Trade-to-Trade (T2T) Segment?

In the normal rolling segment, you can buy and sell the same stock on the same day and settle only the difference. In the trade-to-trade segment, each trade is settled separately and results in delivery. You cannot square off a position within the day to profit from the price move. You have to pay for the shares in full, and sell them only after they are credited to your demat account.

Exchanges move stocks into T2T to discourage speculative trading and to curb sharp price moves. Circuit limits in this segment are also usually narrow. If you do intraday trading, a T2T stock is effectively off limits.

What Is ASM (Additional Surveillance Measure)?

The additional surveillance measure, or ASM, is a framework that exchanges, with SEBI, use to put stocks under extra watch when their price, volume or volatility looks out of line. Stocks are selected using criteria such as price variation, concentration of client buying and the gap between price and fundamentals. The stock then moves through stages, and higher stages bring more restrictions, such as higher margin requirements and trade-for-trade settlement.

An ASM tag does not say the company is bad, and ASM and GSM stages are not a rating of the business. It says the market in the stock has become risky, so you should expect larger swings and thinner liquidity.

What Is GSM (Graded Surveillance Measure)?

The graded surveillance measure targets stocks whose market price looks unusually high compared with fundamental indicators such as earnings, book value and market capitalisation. The stock is moved through graded stages, and at higher stages the exchange imposes restrictions that can include trade-for-trade settlement, a lower price band and a periodic trading limit. The aim is to slow down speculation in stocks that have run up without business support.

Use the Univest Screener to check live fundamentals before you act on any idea.

ASM and GSM stages and conditions are revised by the exchanges, so the stage applicable today should be checked in the latest circular.

What Are Circuit Limits?

A circuit limit, or price band, is the maximum percentage a stock can rise or fall in a single trading day from the previous close. Most stocks have bands of 2%, 5%, 10% or 20%. When a stock hits the upper limit it is called an upper circuit and no buy orders above that price are matched; at the lower limit, it is a lower circuit. Stocks in the derivatives segment generally do not have fixed bands, but the exchange applies dynamic price bands to control sharp spikes.

There is also a market-wide circuit breaker. If a benchmark such as Nifty 50 or Sensex falls or rises by 10%, 15% or 20% from the previous close, trading in the whole market is halted for a set period or for the rest of the day, depending on the level and the time at which it occurs.

How These Labels and Circuit Limits Affect Your Trading

• Intraday: you cannot square off positions in T2T stocks within the day.
• Capital: surveillance stages can raise the margin or require full payment.
• Exit: a stock locked in a lower circuit may have no buyers, so you cannot sell at the lower limit.
• Liquidity: volumes often fall once a stock enters a higher stage, widening the gap between buy and sell prices.
• Risk: price moves in surveillance stocks are driven by speculation and can reverse quickly.

What to Do Before Buying a Flagged Stock

Read the exchange notice to see why the stock is flagged and what restrictions apply. Check the company's earnings, debt and promoter holding rather than relying on the price chart. Because circuit limits can lock a stock, keep position sizes small and set an exit plan, because a stock that cannot be sold in a lower circuit can trap your capital for days.

Download the Univest iOS App or Univest Android App to get daily stock research and market updates.

Conclusion

T2T, ASM, GSM and circuit limits are guardrails that exchanges use when a stock becomes risky to trade. They do not rate the business, but they tell you the market in the stock needs care.

Before buying any stock with these labels, read the exchange notice, size the position conservatively and decide how you will exit if the stock is locked.

Frequently Asked Questions

What does T2T mean in the stock market?

Ans. T2T stands for trade-to-trade. In this segment each trade is settled separately by delivery, so you cannot square off positions within the day and must take or give delivery of the shares.

What is the difference between ASM and GSM?

Ans. ASM looks at unusual price and volume behaviour and applies staged restrictions, while GSM targets stocks whose price appears high compared with fundamentals. Both are surveillance frameworks used by the exchanges and SEBI.

Is an ASM or GSM stock a bad investment?

Ans. The tag does not judge the business. It signals that trading in the stock has become risky or speculative. Check the exchange notice and the company's fundamentals before deciding.

What is an upper circuit and a lower circuit?

Ans. An upper circuit is the maximum price rise allowed in a day and a lower circuit is the maximum fall. When a stock hits a limit, orders beyond that price are not matched until the next session or until the band changes.

What circuit limit percentages are used in India?

Ans. Most stocks have daily bands of 2%, 5%, 10% or 20%. Stocks in the derivatives segment generally use dynamic bands instead of a fixed percentage.

Can I do intraday trading in a T2T stock?

Ans. No. In the trade-to-trade segment every trade results in delivery, so intraday square-off is not available. You must take delivery and sell it later from your demat account.

How do I check if a stock is under ASM or GSM?

Ans. Check the lists published on the official NSE and BSE websites, which show the stocks under each framework and their current stage. These lists are updated whenever the exchanges revise them.