What Is an Upper or Lower Circuit — and Why Does a Stock Get "Stuck"?

What a circuit actually is

Imagine a speed limit, but for a stock's price. On any given day, an Indian stock is only allowed to move up or down by a fixed percentage from its previous day's closing price. That ceiling and floor is called its circuit limit (or price band). The moment the price touches the edge, it isn't allowed to go any further that day — it freezes there.

The exchanges (NSE and BSE) set this band stock by stock, usually at 2%, 5%, 10% or 20%, depending on how wildly the stock tends to swing. The whole point is to stop panic or mania from running away in a single session and to give everyone a chance to pause and breathe.

Upper circuit vs lower circuit

The band has two edges. The upper circuit is the highest the price can climb that day — you hit it when there's a flood of buyers and almost no one willing to sell. The lower circuit is the lowest it can fall — you hit it when everyone wants out and almost no one wants in.

So an upper circuit usually smells of euphoria (good news, a hot result, takeover buzz), while a lower circuit usually smells of fear (bad news, a scandal, a downgrade).

Why the stock gets "stuck"

Here's the part that confuses people. Hitting a circuit doesn't just slow the price — it can stop trading altogether. A trade only happens when a buyer and a seller agree on a price. If a stock is locked at its lower circuit, the screen is full of people trying to sell and there are simply no buyers at that price. Your sell order just sits in the queue, unfilled, sometimes for the whole day.

That's the trap. You can see the price, but you can't actually get out — there's no one on the other side. The stock looks frozen because, in practice, it is. (Separately, there are market-wide circuit breakers that halt the entire market if the Sensex or Nifty swings 10%, 15% or 20% in a day — but those are rare.)

A real example: the Adani stocks (2023)

On 24 January 2023, a US short-seller called Hindenburg Research published a report attacking the Adani Group. What followed was a textbook lower-circuit pile-up. Several Adani stocks opened to a wall of sellers and no buyers, so they got locked in the 5% lower circuit day after day — meaning holders literally could not sell at the falling price.

The damage was brutal. Adani Total Gas and Adani Transmission each crashed about 79% from their all-time high of ₹3,892.50 (hit just before the report). Adani Enterprises alone fell 26% in a single session on 1 February 2023, the day the group pulled its ₹20,000 crore share sale.

The lesson: a circuit isn't a safety net that protects your money — it's a cooling-off mechanism for the market. When a stock is locked limit-down, the circuit isn't saving you; it's the reason you're stuck inside while the value drains away.