A plain-language guide to what actually happens when you buy a share

You tap buy, the app says done, and a share shows up in your account. Behind that half-second is a chain of steps and institutions most people never see. Here is the whole thing, in order.

Understanding what happens under the hood will not change your returns, but it does explain a lot of the things that puzzle new investors, such as why a trade shows as “pending,” what settlement means, and why money from a sale is not always instantly available to withdraw.

Step one: you place an order

Every trade starts with an order, which is simply an instruction to buy or sell a specific amount of a specific share. The two most common types are market orders and limit orders.

• A market order asks to buy or sell straight away at the best price currently available. It almost always fills, but the exact price can move slightly between the moment you tap and the moment it executes.
• A limit order sets the maximum price you are willing to pay, or the minimum you are willing to accept when selling. It gives you control over price, but it may not fill at all if the market never reaches your limit.
• A stop order becomes a market order once the share reaches a price you choose. It is often used to limit losses on an existing position.

Before the order leaves the app, it goes through a set of checks. The app confirms you have enough money or shares, that the market is open, and that the order is within sensible limits. These checks take milliseconds.

Step two: the order is routed

A share is not bought from Robinhood. It is bought from another investor, somewhere else in the market. To find that investor, your order is sent to an execution venue, such as a stock exchange or another regulated trading venue, where buy and sell orders meet.

Brokers are required to seek the best available outcome for their customers when routing orders, taking into account price, speed and the likelihood that the trade will complete. Robinhood publishes regular reports on where customer orders are sent and how they are executed.

Step three: the trade is executed

At the venue, your order sits alongside thousands of others in what is called an order book. On one side are buyers and the prices they are willing to pay, known as bids. On the other are sellers and the prices they will accept, known as asks. The gap between the highest bid and the lowest ask is called the spread.

When someone is willing to sell at the price you are willing to pay, the two orders are matched and the trade is executed. That match is the moment the price is locked in, and it is the point at which the app shows your order as filled.

If you bought a fractional share, one extra step happens here. Exchanges only trade whole shares, so Robinhood combines fractional orders from many customers into whole-share trades, then allocates each customer their exact portion. You own your fraction outright, with the same price exposure as a whole share.

Step four: clearing

Execution is not the end. After a trade is matched, it passes to a clearing house. The clearing house sits between the buyer and the seller and guarantees that both sides will receive what they are owed, even if one of them fails to deliver. It checks the details of the trade, calculates what each party owes, and collects collateral from brokers to cover the risk.

Most people never think about clearing houses, but they are one of the main reasons markets keep working during periods of stress. If a broker fails, the clearing house steps in so that trades still complete.

Step five: settlement

Settlement is when the share actually changes ownership and the cash actually moves. Depending on the market, it typically completes one or two business days after the trade. Until then, the trade is executed but not settled, which is why some features, such as withdrawing the proceeds of a sale, may have to wait a short while.

The trade you see in the app is a promise. Settlement is when that promise is kept.

In the meantime, you are still exposed to the share’s price from the moment of execution. If you bought at ten and the price rises to eleven before settlement, that gain is yours.

Step six: custody

After settlement, your shares are held by a regulated custodian rather than by the app itself. They are recorded in your name, kept separate from Robinhood’s own assets, and protected under the relevant local investor-protection scheme. That separation is deliberate. It means your holdings do not depend on the day-to-day health of the company you trade through.

As a shareholder, you are entitled to the same economic benefits as anyone else who owns that share. Dividends are paid into your account automatically, and corporate actions such as stock splits are applied without you needing to do anything. Where the company allows it, you can also receive shareholder communications and vote on company resolutions from within the app.

Why it matters

Knowing this makes the app’s behaviour easier to read. A “pending” trade is one that has executed but not yet settled. Freshly sold proceeds may take a moment to become available to withdraw because settlement has not completed. A limit order that sits unfilled for hours is simply waiting for someone on the other side to agree to your price. None of it is a glitch. It is the plumbing doing its job, and most of it happens in the time it takes to put your phone back in your pocket.