On March 9, 88% of textile and RMG stocks on the DSE had no buyers. Prices were pinned to their lower circuit limits — frozen at numbers that kept falling session after session, but never fast enough for the market to find a clearing price. Investors who wanted out could not get out. The mechanism designed to protect them had become the cage.
That mechanism is the circuit breaker. Every DSE investor encounters it eventually, but most do not understand exactly how it works until the day it works against them. The rules are straightforward. Their consequences are not.
How DSE Circuit Breakers Actually Work
A circuit breaker is a price band that limits how much a stock can rise or fall in a single trading session. On the DSE, the Bangladesh Securities and Exchange Commission (BSEC) sets these bands as a percentage of the previous session’s closing price.
Under normal conditions, the standard circuit breaker allows a stock to move up to 10% in either direction. If a stock closed at Tk 100 yesterday, today it can trade between Tk 90 and Tk 110. Orders placed outside that band are rejected by the trading system automatically.
The upper limit is the ceiling — the maximum price a stock can reach in a session. The lower limit is the floor — the minimum. When a stock’s price hits either boundary and no trades occur beyond it, the stock is said to have “hit the circuit.”
This is not the same as a trading halt. The stock remains listed. Orders can still be placed. But if every seller is offering at Tk 90 and no buyer will pay Tk 90, the stock simply sits there. Technically open. Functionally frozen.
When BSEC Changes the Rules
The 10% band is the default, not a constant. BSEC has the authority to tighten circuit breakers during periods of extreme volatility — and it has used that authority repeatedly.
During severe market downturns, BSEC can compress the lower circuit breaker to as little as 2% based on the previous day’s closing price. The upper limit and other trading conditions remain unchanged. This asymmetric tightening is designed to slow a freefall: if a stock closed at Tk 100, it can only drop to Tk 98 the next day instead of Tk 90.
The logic is that a 2% daily cap prevents panic cascades. In practice, it stretches a crash over many sessions instead of letting the market clear in one or two violent days. Whether that is better depends entirely on which side of the trade you are sitting on.
What March 2026 Revealed
The March 9 crash was the worst single session since the COVID plunge. The DSEX dropped 209 points — a 3.77% collapse — and the DS30 blue-chip index fell 4.0% to 2,050. Those are index-level numbers. Individual stocks fared far worse.
Stocks like Malek Spinning Mills traded at Tk 25.10, near the bottom of their 52-week range. But “traded” overstates it. Most textile sector stocks were pinned at their lower circuit limits with zero bids. The price on your screen said Tk 25.10. The real price — the price at which a buyer would actually appear — was unknowable because the circuit breaker prevented the market from discovering it.
This is the trap. Circuit breakers protect against flash crashes and manipulation. But when the selling pressure is fundamental — driven by an energy crisis, geopolitical shock, or margin calls — the breaker does not remove the pressure. It queues it. Each session opens at the previous floor, drops to the new floor, and freezes again. Your portfolio shows a 2% daily loss. The actual impairment may be 20% or more, distributed across ten sessions you cannot exit.
Floor Price vs. Circuit Breaker: The Distinction That Matters
Investors often use “floor price” and “circuit breaker” interchangeably. They are not the same.
A circuit breaker is a percentage-based band recalculated daily. If a stock drops 10% today, tomorrow’s band resets around the new, lower closing price. The breaker moves with the market.
A floor price is an absolute level set by BSEC below which a stock cannot trade, period. Floor prices are imposed on specific stocks or across the market during extraordinary interventions — they do not reset daily. When BSEC sets a floor price at Tk 50, that stock cannot trade below Tk 50 regardless of how many sessions pass.
Floor prices override circuit breakers. A stock with a floor price of Tk 50 and a circuit-breaker-derived lower limit of Tk 48 will stop at Tk 50. The floor wins.
What This Means for Your Portfolio
Circuit breakers are not something you can trade around — they are a constraint you must plan for. Three practical implications:
Liquidity vanishes at the limits. When a stock hits its lower circuit, there are sellers and no buyers. You cannot exit. If you are using margin, this is where forced liquidation orders stack up and wait.
Valuation signals break down. A stock showing Tk 25 on the trading board while pinned to its lower circuit is not worth Tk 25. It is worth whatever price would attract a buyer, and you do not know what that price is.
Recovery is also throttled. The same mechanism that slows falls slows rebounds. When sentiment shifted on March 10 and 339 stocks surged, upper circuit limits capped how fast oversold stocks could recover. Patience cuts both ways.
Circuit breakers are the guardrails of the DSE. They prevent the worst single-day outcomes. But guardrails do not prevent the crash — they only control the speed at which you hit the wall. Understanding the difference is the first step toward building a portfolio that does not depend on being able to exit at yesterday’s price.
Disclaimer: This article is for educational purposes only. It does not constitute investment advice. Consult a BSEC-licensed investment advisor before making trading decisions.