Trading circuit breakers are regulatory mechanisms to manage extreme stock market volatility. They temporarily stop market-wide trading when benchmark indices such as the Nifty 50 or Sensex breach specified thresholds.
In India, market-wide circuit breakers operate at 10%, 15%, and 20% index movements, while stock-level price bands restrict the permitted price movements of individual securities. Therefore, understanding their trigger limits helps investors interpret trading restrictions and make informed decisions.
Explore this article to identify the meaning, importance and types of circuit breakers in the stock market.
What is a Stock Market Trading Circuit?
A circuit in trading is a regulatory mechanism that temporarily pauses trading across market segments when a benchmark index moves beyond its expected threshold. It never stops losses or decides end-of-day prices. It creates a pause so traders and investors can reassess information, liquidity and orders before trading resumes.
In case of the market-wide circuit breaker, the levels are determined on a daily basis based on the index value at the end of the previous trading day. The price band mechanism and surveillance measures are applied to individual stocks.
So, who determines the trading circuit limits of a stock? The Securities and Exchange Board of India (SEBI) establishes the regulatory framework for market-wide circuit breakers. Whereas the National Stock Exchange of India (NSE) and the Bombay Stock Exchange (BSE) implement the mechanism under the applicable rules.
Why are Stock Market Circuit Breakers Important?
Stock trading circuit breakers prevent panic trading, restore liquidity, and ensure operational stability. Ultimately, circuit breakers grant both parties time to absorb massive order volumes without becoming overwhelmed.
Interrupting Panic-Driven Trading
Sharp market movements can intensify fear and encourage impulsive decisions. There is a brief pause that suspends trading and allows traders some time to evaluate the information.
Allowing Time for Information Assessment
An unexpected market change could result from an unforeseen economic, political, or corporate event. A pause in trading enables all parties to assess the information at hand and think about their positions.
Supporting Orderly Market Operations
A coordinated trading halt refers to an organised cessation in all affected equity and equity derivatives markets in case of a market-wide threshold breach. It ensures a systematic approach towards stopping and restarting the trading process but does not provide an assurance that disruptions will never occur in the market infrastructure.
Providing a Structured Market Reopening
Post the temporary suspension, the market restarts via the pre-open call auction process. This helps in determining the opening price using the valid orders before the normal market starts.
What are the Different Types of Stock Market Trading Circuit Breakers?
There are mainly two types of circuit breakers: index-level circuit breakers and stock-level circuit breakers. Both operate to protect against market volatility at two distinct levels. Moreover, find out the function of each circuit breaker in detail below:
1. Index-Level Circuit Breakers
An index-level circuit breaker applies to broad market indices such as NIFTY 50 and SENSEX. If these indicators swing beyond specific limits, equity and derivative markets may temporarily close. Moreover, these trading circuit breakers are designed to:
- Prevent Panic buying or selling.
- Allow investors to make informed decisions.
- Promote stable market functionality.
- Reduce risk of losses for both parties.
2. Stock-Level Circuit Breakers
Stock-level circuit breakers apply to individual securities. They are not for the entire market. Each stock is assigned to a specific filter based on factors such as regulatory requirements, liquidity and volatility. However, the common circuit limits include 2%, 5%, 10%, and 20%.
- These limits indicate the maximum price movement during trading hours.
- There are two limits: the upper circuit and the lower circuit.
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How Do Exchanges Calculate Circuit Limits?
The applicable thresholds are calculated from the previous day’s closing value of the index rounded to the nearest tick size. According to the National Stock Exchange, the following are the market-wide halt rules:
What Triggers Stock Market Circuit Breakers?
Stock market circuit breakers can be triggered because of supply and demand imbalances, reduced market liquidity, or macroeconomic or geopolitical shocks. Here is a detailed discussion of the factors that trigger trading circuit breakers in the stock market:
Supply and Demand Imbalances
Supply and demand imbalances often cause circuit breakers because of a sharp market movement. For instance, excessive selling after unfavourable economic news could cause the index to fall into the low circuit breakers category.
For individual stocks, a low price band could be achieved where selling pressure is more than the buying pressure at that price level. A high price band is likely to be achieved where buying pressure is more than the selling pressure at the permissible price level.
Reduced Market Liquidity
Market liquidity is defined by how easily securities are traded without impacting their price level. Market players tend to pull out their orders or ask for wider price levels during uncertain times. Thus, it becomes difficult to trade securities at certain price levels.
A stock that reaches its lower price band may have few or no buyers available at that limit. In such circumstances, a sell order may remain unexecuted.
Macroeconomic and Geopolitical Shocks
Unexpected geopolitical situations or macroeconomic changes such as border conflicts, pandemics, changes in bank interest rates, and more because cascading sell-offs across indices such as the Nifty or Sensex.
For instance, a notable instance occurred on March 23, 2020, when the Indian stock market triggered a 10% market-wide circuit breaker because of the sharp sell-off during the onset of COVID-19. Sensex fell sharply, making worst single-day crashes in Indian market history.
Corporate Announcements
High-impact news from the company may trigger a trading circuit breaker. Positive triggers, such as winning a massive government contract, and negative triggers, such as fraud allegations, can affect the stock.
Sector-Specific Shifts
Changes in government policy, import duties, commodity prices, or regulations can affect companies across an industry. For instance, a hike in import duties on raw materials may hit the manufacturing stocks.
Final Thoughts
Trading circuit breakers offer a way through which the regulators can respond to any unusual market conditions. In India, circuit breakers are set at 10%, 15%, and 20% levels of index movement, while price bands on stocks set the range of permissible trading prices.
Investors need to be careful about the differences between these two concepts to know how to react appropriately to trading restrictions. In times of high volatility, investors must check market statements, understand the risks, and decide in accordance with their financial objectives and risk appetite.
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