Order Types

To send a limit order, call the LimitOrder method with a Symbol, quantity, and limit price. You can also provide a tag and order properties to the LimitOrder method. If you do not have sufficient capital for the order, it's rejected.

LimitOrder(symbol, quantity, limitPrice, tag, orderProperties);

self.limit_order(symbol, quantity, limitPrice, tag, orderProperties)

To buy an asset with a marketable limit order, set the limit price to the current ask price or higher.

To sell an asset with a marketable limit order, set the limit price to the current bid price or lower.

To buy an asset with an unmarketable limit order, set the limit price below the current ask price.

// Buy 1 Bitcoin when the price drops to $34,000
LimitOrder("BTCUSD", 1, 34000);

# Buy 1 Bitcoin when the price drops to $34,000
self.limit_order("BTCUSD", 1, 34000)

To sell an asset with an unmarketable limit order, set the limit price above the current bid price.

// Sell 1 Bitcoin when the price moves up to $60,000
LimitOrder("BTCUSD", -1, 60000);

# Sell 1 Bitcoin when the price moves up to $60,000
self.limit_order("BTCUSD", -1, 60000)

Limit orders fill when the security price passes the limit price. To monitor the fills of your order, save a reference to the order ticket.

// Buy 10 shares of XLK at $140
var ticket = LimitOrder("XLK", 10, 140);
Debug($"Quantity filled: {ticket.QuantityFilled}; Fill price: {ticket.AverageFillPrice}");

# Buy 10 shares of XLK at $140
ticket = self.limit_order("XLK", 10, 140)
self.debug(f"Quantity filled: {ticket.quantity_filled}; Fill price: {ticket.average_fill_price}")

For more information about how LEAN models order fills in backtests, see Trade Fills.

You can update the quantity, limit price, and tag of limit orders until the order fills or the brokerage prevents modifications. To update an order, pass an UpdateOrderFields object to the Updateupdate method on the OrderTicket. If you don't have the order ticket, get it from the transaction manager. The Updateupdate method returns an OrderResponse to signal the success or failure of the update request.

// Create a new order and save the order ticket
var ticket = LimitOrder("SPY", 100, 221.05m, tag: "original tag");

// Update the order
var response = ticket.Update(new UpdateOrderFields() 
{
    Quantity = 80,
    LimitPrice = 222.00m,
    Tag = "new tag"
});

// Check if the update was successful
if (response.IsSuccess) 
{
    Debug("Order updated successfully");
}

# Create a new order and save the order ticket
ticket = self.limit_order("SPY", 100, 221.05, tag="original tag")

# Update the order
update_settings = UpdateOrderFields()
update_settings.quantity = 80
update_settings.limit_price = 222.00
update_settings.tag = "new tag"
response = ticket.update(update_settings)

# Check if the update was successful
if response.is_success:
    self.debug("Order updated successfully")

To update individual fields of an order, call any of the following methods:

• UpdateLimitPrice
• UpdateQuantity
• UpdateTag

var limitResponse = ticket.UpdateLimitPrice(limitPrice, tag);

var quantityResponse = ticket.UpdateQuantity(quantity, tag);

var tagResponse = ticket.UpdateTag(tag);

response = ticket.UpdateLimitPrice(limitPrice, tag)

response = ticket.UpdateQuantity(quantity, tag)

response = ticket.UpdateTag(tag)

When you update an order, LEAN creates an UpdateOrderRequest object, which have the following attributes:

To get a list of UpdateOrderRequest objects for an order, call the UpdateRequests method.

var updateRequests = ticket.UpdateRequests();

update_requests = ticket.update_requests()

To cancel a limit order, call the Cancel method on the OrderTicket. If you don't have the order ticket, get it from the transaction manager. The Cancel method returns an OrderResponse object to signal the success or failure of the cancel request.

var response = ticket.Cancel("Cancelled trade");
if (response.IsSuccess)
{
    Debug("Order successfully cancelled");
}

response = ticket.cancel("Cancelled Trade")
if response.is_success:
    self.debug("Order successfully cancelled")

When you cancel an order, LEAN creates a CancelOrderRequest, which have the following attributes:

To get the CancelOrderRequest for an order, call the CancelRequest method on the order ticket. The method returns nullNone if the order hasn't been cancelled.

var request = ticket.cancel_order_request();

request = ticket.cancel_order_request()

Each brokerage has a set of assets and order types they support. To avoid issues with limit orders, set the brokerage model to a brokerage that supports them.

SetBrokerageModel(BrokerageName.QuantConnectBrokerage);

self.set_brokerage_model(BrokerageName.QuantConnectBrokerage)

To check if your brokerage has any special requirements for limit orders, see the Orders section of the brokerage model documentation.

Limit orders can be submitted at any time for all security types.

If your algorithm subscribes to extended market hours, they can be filled outside regular trading hours.

The following backtest verifies the LimitOrder behavior. On the first day, the algorithm buys SPY with an unmarketable limit order. On the second day, the algorithm sells SPY with an unmarketable limit order and places another unmarketable limit order to buy SPY, which doesn't fill. The following table shows the first three trades in the backtest:

On July 1, 2021 at 9:31 AM Eastern Time (ET), the algorithm places a buy limit order with a limit price of $429 when the ask low price is $428.81 and the ask high price is $429.15. The order fills at 9:32 AM ET at a price of $429. The fill model fills buy limit orders when the ask low price is less than the limit price. It sets the fill price of the order to the minimum of ask high price and the limit price.

On July 2, 2021 at 9:31 AM ET, the algorithm places a sell limit order at $431.70 and a buy limit order at $400. At the time of the order, the bid high price is $431.65, the bid low price is $431.49, and the ask low price is $431.50. The sell limit order fills at 9:35 AM ET at a price of $431.70 and the buy limit order doesn't fill. The fill model fills sell limit order when the bid high price is greater than the limit price. It sets the fill price of the order to the maximum of the bid low price and the limit price. The buy limit order doesn't fill because the ask low price is above the limit price for the remainder of the backtest period.

To reproduce these results, backtest the following algorithm: