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NSE Changes Pre-Open Session Rules From Today: What Traders Need to Know
The 15-minute pre-open session will remain unchanged, but market orders will no longer be accepted after 9:05 am under the revised NSE mechanism.
The National Stock Exchange (NSE) has revised the order-entry rules for its equity market pre-open session from September 7, changing when traders can place market and limit orders.
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The overall pre-open session will continue to run for 15 minutes, from 9:00 am to 9:15 am. However, the first 10 minutes of order entry will now be split into two separate five-minute windows.
The key change is simple: market orders can be entered only between 9:00 am and 9:05 am. From 9:05 am to 9:10 am, traders will be able to submit only limit orders.
How the New Pre-Open Session Works
Under the revised arrangement, the pre-open process will operate in four stages.
| Time | Activity | What Traders Can Do | 9:00–9:05 am | First order-entry window | Market and limit orders can be entered, modified or cancelled | 9:05–9:10 am | Second order-entry window | Only limit orders can be entered | 9:10–9:12 am | Order matching | Orders are matched by the exchange | 9:12–9:15 am | Transition period | Market prepares for normal trading | 9:15 am onwards | Regular session | Normal equity trading begins |
|---|
The second order-entry phase can also close randomly during its final two minutes, according to the revised mechanism.
There is no change to the normal market opening time. Regular equity trading will continue to begin at 9:15 am.
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The Biggest Change: Market Orders End at 9:05 am
For traders, the most important change is the restriction on market orders after 9:05 am.
A market order instructs the exchange to buy or sell a security at the best available price. The exact execution price is therefore not known when the order is placed.
That can become particularly important around the market open, when prices can move sharply because of overnight developments, news or large gaps.
Under the new system, traders who want to participate in the pre-open session between 9:05 am and 9:10 am must use a limit order.
With a limit order, the trader specifies the maximum price they are willing to pay when buying or the minimum price they are willing to accept when selling.
Why NSE Is Changing the Rules
The revised arrangement is designed to make the pre-open mechanism more closely aligned with the auction process used during the Closing Auction Session (CAS).
The change follows NSE’s earlier adjustments to the methodology used for determining closing prices.
By separating market and limit order entry during the pre-open period, the exchange is changing how orders can enter the auction shortly before matching begins.
For traders, this means the timing of an order will now matter more than before.
How Orders Will Be Matched
NSE has also specified the order in which trades will be considered under the revised mechanism.
First, market orders that can be matched with other market orders will receive priority, with time priority determining the sequence.
Any market orders that remain unmatched will then be considered against available limit orders, using price-time priority.
Finally, outstanding limit orders will be matched with other limit orders according to the same price-time priority principle.
This establishes a defined sequence for the matching process once the order-entry period ends.
What Does the Change Mean for Traders?
The impact will be most noticeable for traders who regularly place orders toward the end of the pre-open session.
Previously, a trader could use a market order during the order-entry period. Under the revised system, that option disappears after 9:05 am.
Anyone entering an order between 9:05 am and 9:10 am will need to specify a price through a limit order.
This gives traders greater control over the price at which they are willing to transact, but it also means an order may not execute if the specified price cannot be matched.
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Does the Market Still Open at 9:15 am?
Yes.
The change affects the order-entry mechanism during the pre-open auction, not the start of regular equity trading.
The pre-open session will still conclude before normal trading begins at 9:15 am.
The order matching phase will run from 9:10 am to 9:12 am, followed by a three-minute transition period before the regular session starts.
What Traders Should Remember
The key points under the revised NSE pre-open mechanism are:
- The pre-open session remains 9:00 am to 9:15 am.
- Market and limit orders are allowed from 9:00 am to 9:05 am.
- Only limit orders can be entered from 9:05 am to 9:10 am.
- The second order-entry phase may close randomly during its final two minutes.
- Order matching takes place from 9:10 am to 9:12 am.
- The regular market continues to open at 9:15 am.
For traders, the practical takeaway is that 9:05 am becomes an important cutoff for market orders during the pre-open session.
FAQ
What has NSE changed from September 7?
NSE has revised the order-entry mechanism for the equity market’s pre-open session. The first 10 minutes are now divided into two five-minute windows.
Can I place a market order after 9:05 am?
No. Under the revised arrangement, only limit orders can be entered between 9:05 am and 9:10 am.
What time does the NSE pre-open session start?
The pre-open session continues to start at 9:00 am and ends at 9:15 am.
What time does regular stock market trading begin?
Regular equity market trading continues to begin at 9:15 am.
What is the difference between a market order and a limit order?
A market order seeks execution at the best available price, while a limit order specifies the maximum buying price or minimum selling price acceptable to the trader.
When does order matching happen?
Under the revised mechanism, order matching takes place between 9:10 am and 9:12 am.
Why should traders care about the 9:05 am cutoff?
Traders who want to use a market order during the pre-open session must now submit it before 9:05 am. After that, they must use a limit order.
Also Read | Gold, Silver Prices Today, September 7: Check 24K, 22K and 999 Silver Rates in Major Cities
The post NSE Changes Pre-Open Session Rules From Today: What Traders Need to Know first appeared on informalnewz.
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