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Beginner
6 min read

How Buying a Stock Actually Works

An order travels from you through a broker to the market, gets matched, executed and settled.

The short answer

Buying a stock means placing an order that a broker routes to the market, where it is matched against a counterparty, executed at an agreed price, and then settled into your account. The type of order you choose — market or limit — determines whether you are guaranteed speed or price.

What you'll learn

  • Describe the path an order takes from investor to settled trade
  • Distinguish a market order from a limit order
  • Define bid, ask and spread and explain why the spread is a real cost

The path of an order

Investor places an order, the broker routes it, the market matches it against a willing counterparty, the trade executes at an agreed price, then it settles and the shares appear in your account.

The vocabulary you will see

These words appear on every order screen.

  • Ticker: the short code identifying a listed security
  • Bid: the highest price a buyer is currently offering
  • Ask: the lowest price a seller is currently accepting
  • Spread: the gap between bid and ask, an implicit cost
  • Market order: execute now at the available price
  • Limit order: execute only at your price or better
  • Fractional shares: buying part of one share by dollar amount
  • Cost basis: what you paid, used later to calculate taxable gain

Market orders versus limit orders in practice

A market order prioritises certainty of execution: it fills almost immediately, at whatever price is currently available, which can matter on a highly volatile day.

A limit order prioritises certainty of price: it only fills at your specified price or better, but it may not fill at all if the market never reaches it. Neither choice is universally correct; it depends on which certainty you need more.

Why this matters

Understanding execution keeps you from blaming the market for a cost you chose.

How this connects to Intelligent Accumulation

Regular contributions work best with simple, predictable order types; understanding the mechanics removes a source of anxiety that can otherwise disrupt a consistent buying schedule.

Read the full approach

Terms used in this lesson

Ticker
The short code identifying a listed security.
Bid
The highest price a buyer is currently offering.
Ask
The lowest price a seller is currently willing to accept.
Cost basis
What you paid for an investment, used to calculate taxable gain or loss.
Settlement
The completion of a trade, when ownership is officially transferred.
See the full glossary

Check your understanding

No score is recorded. This is only here to test whether the lesson landed.

1. What is the 'spread'?
2. Which order type guarantees execution but not price?

Key takeaways

  • An order passes through several steps before it becomes a settled holding
  • The spread between bid and ask is a real, if small, cost of every trade
  • Market orders trade price certainty for speed; limit orders do the reverse

Related concepts

Written by
Suggested Investments Research Team
Content type
Educational article
Published
2026-09-13
Last reviewed
2026-09-13

Sources and methodology

What Is a Brokerage Account?Your First Investment Checklist

Educational content only. This lesson is not investment, tax or legal advice and does not recommend buying or selling any specific investment. All investing involves the risk of loss.