A wealth order management system is the software that takes each trade from an adviser's decision to the broker, and records it for each client. Order management systems are often called OMS. A wealth OMS also connects investment firms with the brokers and custodians they work with. A custodian is the firm that holds a client's investments safely.
An adviser rarely makes one trade for one client. More often, the adviser makes one decision for many clients at once.
Here is a typical case. An adviser decides to sell one exchange-traded fund (ETF) and buy another for 200 clients. Each client holds a different amount, so each needs a different number of units. The adviser enters the decision once on the wealth management platform. The order management system then does four things.
First, it works out the order for each of the 200 accounts. It checks that each account has the shares or cash needed, and that the trade follows the client's rules. For example, one client may not want to hold shares in tobacco companies.
Second, it combines the 200 orders into one large order. This is called a block order. One large order is usually cheaper and faster than 200 small ones.
Third, it sends the block order to a broker. The broker's own order management system (OMS) for brokers sends it to the stock exchange, where the matching engine matches it with sellers.
Fourth, when the trade is done, the OMS divides the result back among the 200 accounts. Each client gets their share at the same average price. This is called allocation. The trades then go to post-trade processing, which confirms them with the broker and the custodian before they settle.
How is it different from a broker's OMS? A broker's OMS handles orders from many investors and sends them to the market. A wealth OMS sits on the adviser's side. It turns one decision into the right order for each client.