Lower Circuit
A lower circuit is the minimum price limit a stock can fall to in a single trading session, set as a fixed percentage below the previous day's closing price by SEBI and exchanges. Once triggered, no trade can occur below this price for the remainder of the session.
Lower circuit limits are the mirror of upper circuits — they represent the floor below which a stock's price cannot fall within a single session. Like upper circuits, the bands are set at 2%, 5%, 10%, or 20% of the previous closing price. When a stock is 'locked in lower circuit', there are typically many more sellers than buyers at the circuit price. This creates a situation where exit is extremely difficult — sellers queue up but find no willing buyers, and orders remain unexecuted despite the apparent activity.
Lower circuits are particularly feared in Indian markets because they can indicate serious company-specific distress. When a company announces poor quarterly results, regulatory action, promoter pledging issues, or fraud allegations, its stock can hit lower circuit on multiple consecutive days, trapping investors who are unable to exit. High-profile cases like IL&FS subsidiaries, DHFL, and certain pharma stocks in India saw repeated lower circuit locks that caused enormous losses for retail and institutional investors who were unable to liquidate positions in time.
For retail investors, the risk of a lower circuit is most acute in small-cap and mid-cap stocks with low liquidity. In large-cap Nifty 50 stocks, individual circuit limits are typically set wider (20%) and the sheer volume of trading means that even sharp declines rarely result in a complete absence of buyers. The circuit mechanism here provides a brief delay rather than a complete exit blockage. In illiquid small-cap stocks, however, multiple days of lower circuits can result in a complete loss of liquidity and ultimately substantial capital erosion.
SEBI's risk management framework includes additional protections: the Value at Risk (VaR) margin system ensures brokers collect adequate margins from traders to cover potential losses, and dynamic margins can be applied to highly volatile stocks to reduce speculative excess. However, no regulatory mechanism can fully protect investors from the losses that accompany a stock in genuine fundamental distress. The best protection remains thorough due diligence before investing.