Order Flow: Meaning and Trading Use

What is order flow

Order flow is the stream of buy and sell orders reaching a market, and traders study it because it can show who is acting more urgently, buyers or sellers, at a given price.

Some terms used below:

Market order: an order to trade now at the best available price.
Limit order: an order that waits at a chosen price until someone trades against it.
Order book: the list of resting limit orders at each price.

Depth of market: the volume waiting at each price. A large order moves through several levels, so its average price is worse than the best quote. Illustrative example: made-up numbers for learning, not real prices or a broker's conditions.

Formal definition

In market microstructure, order flow is the sequence of order events in a market: new orders, changes, cancellations and executions, each with a price, size, side and time. A trade has an aggressor (the side that used a market order, or a limit order priced to execute at once) and a passive side (the resting limit order). Signed order flow counts aggressor buys as positive and aggressor sells as negative. The running net of the two is often called delta, or cumulative delta.

"Order flow trading" means reading these events to judge short-term supply and demand. It does not predict prices. The same reading can be correct one day and wrong the next.

Worked example (hypothetical)

A futures contract trades near a round price. The time-and-sales window, which lists every trade, shows a long run of aggressive buy orders hitting the offer. Delta rises sharply.

The price does not move up. The visible sell size at that level keeps refilling after each trade. A likely reason is a large passive seller using an iceberg order, which shows only a small part of its real size at a time. Buying pressure is being absorbed.

An order flow reader would note the absorption. That reading is not a signal. The hidden seller may finish, and price can then move either way.

Where the term appears

Platforms: depth-of-market (DOM) ladders, time and sales, footprint charts and volume profile tools in futures and stock platforms. In MetaTrader, the volume shown for forex and CFDs is usually tick volume, which counts price changes rather than traded size.
Reports: bank and exchange research on positioning, and broker reports about client flow. In US equities, "payment for order flow" means a broker being paid to route client orders to a market maker.
News: phrases such as "heavy selling flow into the close" or "real-money buying" in market commentary. See also opening and closing auctions.

Edge cases experienced traders should know

Spot forex has no central exchange. No single feed shows all orders, so any order flow you see comes from one venue or one liquidity provider.
Cancellations matter. Large orders placed and then pulled can mislead. Doing this on purpose (spoofing) is illegal on regulated exchanges.
Dealer flow differs from exchange flow. A dealer's own client orders may be internalised. See A-book and B-book.
Fast markets can empty the book. Orders then fill far from the expected price, as in a flash crash.

Leveraged forex and CFD trading can lose money fast. No order flow tool removes that risk. See risk management.

Frequent questions

What is order flow in simple words?

It is the stream of buy and sell orders coming into a market. It shows whether buyers or sellers are acting more aggressively at a price.

Is order flow the same as volume?

No. Volume counts how much traded. Order flow also records which side started each trade, plus orders that were placed or cancelled without trading.

Can I see real order flow in forex?

Only partly. Spot forex is decentralised, so you see the flow of one venue or provider, not the whole market. Exchange-traded futures give a fuller picture.

Does order flow trading guarantee better results?

No. It is one way of reading the market, and it can be wrong. Leveraged trading can still lose money quickly.