Reserve Order

Overview

Reserve Order is an order that displays only part of its total quantity while retaining additional undisplayed quantity that can replenish the displayed portion according to venue rules. It is commonly called an iceberg-style order and differs from a fully hidden order because some quantity is displayed.

Reserve Order is closely connected to Limit Order Book, Limit Order, and Liquidity Depth. These concepts can appear in the same workflow, but they represent different records, decisions, controls, or stages.

For review and reconciliation, teams should reconstruct every order from submission through amendment, fill, cancellation, and final position without relying on one venue status. This distinction is important because related market states can be economically connected without being interchangeable.

Reserve Order can appear in the same workflow as Limit Order Book, Limit Order and Liquidity Depth, but the records should remain separately identifiable. A relationship between them does not prove that pricing, execution, settlement, custody, or accounting has completed.

For Reserve Order, the central operating question is whether the stated result can be reproduced from the underlying evidence. In this case, it is commonly called an iceberg-style order and differs from a fully hidden order because some quantity is displayed. That evidence should remain available after corrections, later settlements, or revised market data arrive.

The supporting record should include instrument, side, quantity, order conditions, venue, timestamps, fills, cancellations, and final status. For this concept, the operational emphasis is also that in production, teams should define the authoritative record, identifiers, ownership, lifecycle rules, and evidence used to confirm the outcome. Reviewers should be able to trace each reported value back to the source and effective time used for the decision. This added control specifically concerns an order that displays only part of its total quantity while retaining additional undisplayed quantity that can replenish the displayed portion according to venue rules.

The main control tests should cover stale market data, incorrect triggers, duplicate submission, price gaps, partial fills, venue rejection, and inconsistent cancellation. Both normal and stressed scenarios matter because an apparently available price, balance, venue, or settlement route may fail when the transaction is actually attempted. The record-level focus here is an order that displays only part of its total quantity while retaining additional undisplayed quantity that can replenish the displayed portion according to venue rules.