---
title: "What is order blocking in LUSID?"
slug: "what-is-order-blocking-in-lusid"
tags: ["blocks", "trade lifecycle"]
updated: 2025-04-10T14:39:06Z
published: 2025-04-10T14:39:06Z
canonical: "support.lusid.com/what-is-order-blocking-in-lusid"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://support.lusid.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What is order blocking in LUSID?

An order block in LUSID is the grouping together, or blocking, of one or more similar [orders](/v1/docs/what-is-an-order-in-lusid). Blocking orders allows you to place all of them in the market at once, or create multiple smaller [placements](/v1/docs/what-is-a-placement-in-lusid) for the block.

Every order in LUSID must have a block associated with it. A block contains one or more orders, and you can block orders created at different times.

For example, a Portfolio Manager might create one order for 100 AAPL US equity shares at 10:00am, and a separate order for 150 AAPL US equity shares just before midday. As a Trader, you might pick both of these orders up in the afternoon and block them together to create a block of 250 shares, ready to place.

![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/image(708).png?sv=2026-02-06&spr=https&st=2026-11-04T02%3A00%3A52Z&se=2026-11-04T03%3A00%3A52Z&sr=c&sp=r&sig=0%2FgsYD1sxDQlDxiH14F9muv%2FJ6HDinLTjiVeh%2BflXp4%3D)

There is no limit to the number of orders you can add to a block as long as they have the same:

- LUSID Instrument ID (LUID).
- Order side, for example whether the order is to buy or sell.
- State, which must be “New”.
- Order type, either market, limit or stop. If the order type is limit or stop, the price must also be equal to be able to add multiple orders to a block.
- Time in force, that is, how long the order stays in effect.

[See how to block orders.](/v1/docs/how-do-i-block-orders)