January 28, 2026
4 mins read
IOC, or Immediate or Cancel, is an order type used in the share market where execution is attempted as soon as the order is placed. Any portion of the order that cannot be executed immediately is automatically cancelled. IOC orders are explained to describe how execution works in fast-moving market conditions, where orders are either matched instantly or removed from the order book. This order type helps portray how exchanges handle time-sensitive orders and manage unexecuted quantities within the trading system.
An IOC, or "Immediate or Cancel" order, is a simple command in the stock market. It tells your broker to do as much of your trade as they can right now. Any portion that can’t be filled instantly gets cancelled immediately.
The beauty of an IOC is that you don’t have to monitor it. The system handles it instantly. Whether you're buying or selling, only the part that finds an immediate match gets executed. The rest is gone, making it perfect when speed is your top priority.
Ever needed to make a trade fast without leaving an order open? That’s exactly what an IOC order is for. It's great for trades that only last a few seconds, and timing is everything.
IOCs are great for big orders because they don't show how big they are, which could change the price. You can do what's available without making a big deal out of it. They help you move quickly in markets that change a lot, and they are a lifesaver for traders who have a lot of open positions at once.
IOC orders are great when you're busy or the market is unstable. An IOC helps you get the suitable price right away in a market that moves quickly, even when prices change quickly.
If you prefer an automated, hands-off approach, IOC orders are a great fit. They remove the stress of manually tracking open orders. Even with a partial fill, the job is done instantly. This frees you up to focus on your trading strategy instead of micromanaging every single trade.
Your order doesn't need to be filled completely. Whatever part finds an immediate match gets executed, and the rest is simply cancelled.
An IOC order is live for just a moment. If it isn't filled instantly, it vanishes from the system automatically.
They are perfect for fast-paced markets. Any delay could mean missing your price, and IOCs prevent that from happening.
Forget about checking on your order later. The system takes care of it all in a flash, removing any unfilled parts.
They are great for breaking up big trades. You can buy or sell in pieces without sending a single large order that could change the price.
Log into your trading account and pick your stock. Just choose 'IOC' from the order type menu and then enter your quantity and price.
Decide if you're buying or selling. Double-check that all the order details correctly reflect your intended trade before proceeding.
You must enter a specific limit price for your trade. IOC orders can't be used as simple market orders, as a price limit is required.
Give everything one last look, then hit confirm to submit your IOC order. Your platform will instantly send it to the exchange for execution.
Once submitted, only the matched portion is filled. The rest is cancelled. You can see the final details in your order history.
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IOC stands for Immediate or Cancel. It refers to a trade order that must be executed immediately. If any portion of it cannot be completed instantly, that part is automatically cancelled.
You may use an IOC order when you want a trade to go through quickly or partially, without waiting. It works well for large trades, fast-moving markets, or when monitoring orders is difficult.
The benefits of an IOC order include swift execution and reduced market impact, allowing traders to capitalise on immediate opportunities without the risk of price fluctuations affecting their trades.
An investor who wants to buy 1,000 shares of a stock at £10 is an example of an IOC order. If 700 shares are filled immediately and 300 remain unfilled, those 300 will be cancelled.
An IPC (Immediate or Persist) order should be used when an investor wants to fill a portion of the order immediately while keeping the remaining quantity open for future execution.
An IOC order is executed immediately, and any unfilled portion is cancelled at once. A limit order, however, stays open until the market reaches the chosen price or the order is cancelled, which may take minutes, hours, or even days.
If only part of an IOC order can be filled immediately, that portion is executed. The remaining unfilled quantity is cancelled instantly and does not stay pending in the market.
Yes. You can use IOC orders to buy or sell. The order goes through right away at the best price available or the limit you set. If any of the quantities can't be filled right away, the order is cancelled.
IOC orders are mostly used for trading during the day. IOC orders are effective in fast-moving markets where traders prefer to fill their orders immediately and avoid having any open orders. Typically, long-term investors prefer orders that remain open until they reach a specific price.
Yes — Immediate or Cancel (IOC) orders can be used in both equity and derivatives markets. They’re all about getting filled quickly; any portion that doesn’t execute right away gets cancelled.
Not really. An IOC order shows buying or selling interest briefly, but if it isn’t matched immediately, it vanishes. Since it doesn’t stay on the order book, it doesn’t add long-term liquidity.
Yes. Intraday traders often use IOC orders when speed matters. The trade either goes through instantly or gets cancelled, which helps avoid surprises later in the trading day.
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