NEPSE circuit breaker rules: what actually halts the market
Updated 25 October 2026 · Nepsense Markets
The rules changed on 20 April 2026. If you learned NEPSE circuit breakers before that date, you learned a system that no longer exists: the 4%, 5% and 6% ladder is gone, and so is the 10% daily limit on individual stocks.
Here is what replaced it, what it means for a position you are holding, and how often any of it actually fires — measured against 6,615 trading days in our own index records.
What a circuit breaker is, and the two kinds NEPSE runs
A circuit breaker is an automatic halt. When prices move too far, too fast, trading stops for a set period so orders can be repriced instead of filled in a panic.
NEPSE runs two mechanisms that get talked about as if they were one:
- The index-wide halt. Triggered by a move in the NEPSE index. When it fires, every stock pauses.
- The stock-level price band. A cap on how far any single company can move in one session. It has nothing to do with the index.
If you want the current number rather than the rule, today's NEPSE index is the place to look. What follows decides what happens when it moves.
The NEPSE circuit breaker rules since 20 April 2026
These come from the Securities Trading Operation (Fourth Amendment) Regulations, in force from 20 April 2026.
| Trigger | Until 19 April 2026 | From 20 April 2026 |
|---|---|---|
| Index moves 4% | 20-minute halt if in the first hour | No halt |
| Index moves 5% | 40-minute halt if before 13:00 | 15-minute halt if within the first two hours |
| Index moves 6% | Closed for the rest of the day | No closure |
| Index moves 8% | — | Closed for the rest of the day |
| Single stock, one session | ±10% | ±15% |
| Pre-open price band | ±2% | ±5% |
Three things in that table are worth saying out loud.
The 5% halt is time-bound. The rule is written as a 5% move "within the first two hours of the session". Continuous trading runs 11:00 to 15:00, so that window is 11:00 to 13:00. A 5% move that first happens at 14:30 does not meet the trigger as written; the 8% closure is the level described without a time limit.
The pause comes first, the closure second. A 5% move buys you 15 minutes. If the index then reaches 8%, the day is over and anything still unmatched does not fill.
15% is not a circuit breaker. It is the daily band on a single stock. A scrip can fall 15% in a session with no index halt anywhere in sight.
What the old 4/5/6% regime did
The system this replaced escalated in three steps, each tied to a clock. A 4% move inside the first hour paused trading for 20 minutes. A 5% move before 13:00 paused it for 40. A 6% move at any point in the day shut the market until the next session. Individual stocks were capped at 10%, and pre-open orders at 2%.
Two recent sessions show how that played out.
On 18 September 2025 the index fell 4% about two minutes after the open and halted, fell 5% when trading resumed and halted again, then closed the day down 6.0% — the level at which the old rules shut the market outright.
On 9 March 2026 the same machinery fired in the other direction. The index rose 4%, or 108.60 points, within about a minute and ten seconds of the open, and trading paused for 20 minutes. Our records show that session closed up 6.01%.
The stated reason for the April 2026 rewrite was to cut the number of halts and give investors more trading room during high-momentum sessions.
How often the index actually moves 4%, 5% or 8%
Rules are easy to state and hard to picture. Our index database runs from 20 July 1997 to 16 October 2026 — 6,615 trading days — so the frequency is measurable rather than a matter of impression.
| Close-to-close move | Sessions since 2015 |
|---|---|
| 4% or more | 41 |
| 5% or more | 21 |
| 8% or more | 0 |
Some context. The average absolute daily move over the last 250 sessions is 0.72%, so a 5% day is roughly seven times a normal one, and it turns up about once or twice a year. An 8% day has not happened in our records since 2015, which makes the full-day closure a rule almost nobody trading today has seen used.
Some of the 5%-plus days in our records: 19 July 2020 (+6.04%), 6 December 2020 (−6.0%), 14 December 2021 (+6.0%), 10 December 2023 (+6.0%), 4 March 2024 (+6.0%), 6 August 2024 (−5.19%), 18 September 2025 (−6.0%) and 9 March 2026 (+6.01%).
In points, at the 16 October 2026 close of 2,634.17, a 5% move is about 132 points and an 8% move about 211. That is the distance between a bad morning and a halted one.
The index is capitalisation-weighted and has long been said to reflect the banking sector above everything else, which is why a halt is usually a bank story before it is anything else. On a halt day the sector split explains more than the headline number does — NEPSE sector performance is the fastest read.
What the 15% stock band means for a position
Raising the daily band from 10% to 15% did something quiet and important: it widened the worst case for a single holding by half.
A stock can now fall 15% in one session before the band stops it. If you hold leverage or a concentrated position, that is the number that matters, not the index halt. The index can sit comfortably inside its 5% trigger while one scrip in your portfolio goes to the floor.
The band cuts both ways — it also allows a 15% move up. And because pre-open orders now have a 5% band from the previous close instead of 2%, the opening price itself can gap further than it used to.
What to do when a halt actually hits
- Work out which halt you are in. A 15-minute pause and a closed day need different decisions. The exchange says which; don't guess from a frozen screen.
- Assume nothing is filling. When an index halt fires, every stock pauses and resting orders cannot execute until trading resumes. If it becomes a full-day suspension, unmatched orders do not fill that session at all.
- Don't read the reopen as a verdict. The pause exists because the move was too fast to price, not because the move was wrong. A 15-minute halt tells you the index moved 5% quickly. It tells you nothing about where it goes next.
- Look at what drove it. With a bank-heavy, capitalisation-weighted index, a 5% move is usually a handful of large names rather than the whole board.
- Check the floorsheet after the close. NEPSE publishes broker-level detail on every trade, which is unusual among exchanges, and the buy and sell sides on a halt day are where the useful information sits. How to read the NEPSE floorsheet covers the mechanics.
- Remember the settlement clock does not stop. A halt pauses trading, not settlement. Anything already executed still settles on T+2. NEPSE's T+2 settlement explains the timing.
What hasn't changed
The market still trades Monday to Friday, 11:00 to 15:00, with pre-open from 10:30. The week itself moved from Sunday–Thursday to Monday–Friday in April 2026, and a lot of older guides still have that wrong. NEPSE trading hours has the full session schedule.
The index is still the same instrument: capitalisation-weighted, updated through the session, and still well below its 2021 peak. The all-time closing high in our data is 3,198.19 on 18 August 2021; the latest close is 2,634.17 on 16 October 2026. The NEPSE index history covers the long arc.
Three things people still get wrong
- "The market closes at 4%." It did until 19 April 2026. Since 20 April, a 4% move triggers nothing.
- "A circuit breaker halts my stock." The index halt pauses the whole market. What stops an individual stock is its own 15% band, a separate rule with a separate trigger.
- "The band protects me." It caps how far the price can go in a day. It does not stop the price going there.
If you would rather see the index, the sectors and the orders behind them on one screen than across three tabs, that is what Nepsense is built for.
Key takeaways
- Since 20 April 2026, a 5% index move inside the first two hours halts NEPSE for 15 minutes; an 8% move closes it for the rest of the day.
- The old 4/5/6% ladder and the 10% stock limit are gone. A 4% move now does nothing.
- The daily band on a single stock is 15%, and pre-open orders carry a 5% band.
- In our records since 2015: 41 sessions moved 4% or more, 21 moved 5% or more, none reached 8%. The average day moves 0.72%.
- A halt pauses trading, not settlement. Executed trades still settle on T+2.