How PSX Circuit Breakers Work and What They Mean for Your Trades

Every year, thousands of Pakistani retail traders learn about circuit breakers the hard way — by placing an order and then being unable to exit for days as the stock trades locked at its lower circuit. This guide explains exactly how PSX's circuit rules work in 2026, what triggers them, and how to trade around them so you never get trapped.

The two circuit types

PSX operates two separate circuit mechanisms:

1. Individual stock daily circuit (Price Band)

Every listed stock has a daily price band — a maximum percentage move (up or down) allowed from the previous day's close. Standard bands in 2026:

Regular stocks: ±7.5% per day
Special-tier stocks and futures-eligible: ±10% per day
New IPOs (first 30 days): ±7.5% typically

When a stock's price reaches the daily band limit, that becomes the day's tradeable ceiling (upper circuit) or floor (lower circuit). Trades can continue AT the circuit price but not through it.

2. Market-wide index halt (PSX-100 circuit)

Rarer. If the KSE-100 moves ±4% within a session, trading pauses briefly (usually 45 minutes) to give the market time to digest. If it moves ±5%, longer halt. These are rare events triggered by major macro shocks.

What actually happens when a stock hits circuit

Upper circuit

Stock price locked at the +7.5% (or +10%) level
Buy orders pile up at that price with no matching sellers
Bid queue grows visibly on trading terminals
Exchange displays "UC" flag next to the ticker
You cannot buy unless someone at the front of the queue sells (rare)
You CAN sell if you already own it — someone in the queue will take it

Lower circuit

Stock price locked at the -7.5% (or -10%) level
Sell orders pile up with no buyers
Ask queue grows
Exchange displays "LC" flag
You cannot sell unless someone in the queue backs out or a brave buyer appears
You CAN buy if you're willing to catch the falling knife

Why lower circuits are the dangerous one

Stocks hit upper circuits during good news — pleasant problem to have (you can't buy more but you're already up). Lower circuits are the wealth destroyer. Scenarios:

Freeze cascade: a stock hits LC on Monday. Sellers who couldn't exit stack orders for Tuesday. Tuesday opens at LC again. Same on Wednesday. In extreme cases (delisting rumors, fraud allegations), stocks stay locked at LC for 5-10 consecutive sessions.
Effective 40-50% loss with zero ability to act: 5 sessions × -7.5% each = -32% before you can even sell.
Margin calls: if you bought on any leverage (badla financing common on PSX), the broker liquidates from ANY of your holdings — often at worst prices.

Examples of PSX stocks that have hit lower-circuit cascades in recent years: multi-day LCs on delisting rumors, corporate governance issues, or sudden geopolitical events. Small-cap and mid-cap names are most vulnerable.

How to trade around circuits

Prevention (best defense)

Understand the price band on any stock you own. Standard 7.5%, special-tier 10%. This is your daily downside cap.
Avoid stocks with recent LC history unless you know the context. If a stock hit LC twice in the last 30 days, either it's genuinely broken or extremely volatile — position size accordingly.
Position size to survive a 30% drop with no ability to exit. If you can't stomach that, size smaller. This is the true meaning of "never invest more than you can afford to lose."
Watch the queue depth. If bid-side is drying up and ask-side is growing during a decline, LC is often imminent. Consider exiting BEFORE the LC hits.
News awareness. Corporate events (SBP announcements, earnings misses, regulatory actions, foreign-flow reversals) often trigger circuits. Don't hold heavy positions into known event dates.

Reaction (if already trapped)

Do not average down into a locked LC. Adding to a position that can't be sold is doubling down on illiquidity.
Read the news, do NOT trust market rumors. Confirm via official disclosures (PSX filings) not WhatsApp forwards.
Set a mental stop for the next session. If it opens ANYWHERE — even at LC — take the exit if you've decided the thesis is broken.
Don't take on more margin. If a broker offers to fund your average-down, that's typically a bad idea when the stock is at LC.

The upper-circuit trap (subtler)

Upper circuits can also cost you money — indirectly:

Waking up to a UC on your watchlist stock feels like FOMO. You place a buy at the top of the queue for tomorrow. Tomorrow it gaps up and immediately hits another UC. By day 3 you're chasing a stock 20-25% above where you first noticed it.
The stock then normalizes and gives back 15% over the next week.
You bought the peak of retail FOMO.

The discipline: never chase a UC unless there's specific new information supporting the move. If you weren't planning to buy the stock before the UC news, don't start now.

PSX-specific circuit quirks

Auto-lift on volume

When a stock hits UC or LC with very high volume, PSX sometimes reviews and lifts the band temporarily. This is rare but happens on futures-eligible names during exceptional flow.

Special deals and blocks

Large institutional trades (block deals) can occur OUTSIDE the daily band via special deals. These may print at prices that look like they violate the circuit but are treated as separate transaction types.

T+2 settlement means yesterday's trade is still open

Even if a stock LCs today, your buy from Monday only settles Wednesday. If cash isn't available Wednesday, that's an additional problem separate from the circuit itself.

Using PSX Invest

Our AI signal generation deliberately avoids stocks in extreme circuit-hit patterns. If a stock has hit LC in 3+ of the last 10 sessions, it typically won't appear in the BUY opportunity feed regardless of technical indicators — because the risk of being trapped outweighs the reward. Add symbols to your watchlist and the platform's context flags any circuit-adjacent risk.

Bottom line

Circuit breakers are a market-structure fact, not something to fear irrationally. Understand the ±7.5% / ±10% daily band on every stock you own. Size positions to survive a 3-5 session LC cascade if it happens. Don't chase upper circuits without new info. Don't average down into locked lower circuits.

Every experienced PSX trader has been trapped at least once. Learn from other people's mistakes when you can — this article is one way.

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Circuit rules can change. Verify current price band applicable to your specific holdings via the official PSX website or your brokerage terminal.