What it means
A company that wants to sell shares to the public applies to be listed on an exchange, meets its reporting and governance requirements, and pays listing fees. Once listed, its shares trade throughout the day between buyers and sellers who are matched by the exchange's systems.
The company itself only receives money when it first issues new shares, not on every later trade between investors. Exchanges matter in business because they set a visible price for a company, and that price drives market capitalisation (the total value of all its shares).
A visible price makes it easier to raise fresh capital, to use shares as currency in acquisitions, and to pay staff with equity that can actually be sold. Most people never trade directly on an exchange.
They place orders through a broker, which routes the order to the exchange, where a matching engine pairs it with an opposite order at an agreed price. A separate clearing house then confirms the trade and arranges the swap of cash and shares a day or two later.
Exchanges earn their own revenue from listing fees, trading fees, data sales and technology services. Some are owned by member brokers, while many today are themselves listed companies run for profit.
This is why finance teams sometimes study an exchange as a business with its own revenue and margins, not only as a venue. A useful way to judge an exchange is liquidity, meaning how easily you can buy or sell without moving the price.
Deep liquidity shows up as a narrow gap between the buying and selling price, called the bid-ask spread. Thin liquidity makes trading more expensive and can put off the very investors a company hopes to attract.
One common point of confusion is that an exchange is not the same as an index. An index such as a broad market average is just a calculated score for a basket of shares, while the exchange is the venue where those shares actually change hands.
Also, a share can be listed on more than one exchange at once, which is called a dual listing.
In practice
Real-world examples
Example 1
A software founder takes her company public on an exchange after a decade of private funding. The listing raises $90,000,000 of new capital for product development, and the exchange's disclosure rules force the company to publish audited results every year. Her early employees can finally sell the shares they were granted.
Example 2
A pension fund manager needs to sell a $5,000,000 holding in a manufacturing company. Because the stock trades on a deep exchange, he can sell in small slices through his broker over a single afternoon without pushing the price down. In a thinly traded market the same sale could take weeks.
Example 3
A retail chain's finance director is asked why the company's share price matters when it has no plans to raise money. She explains that the exchange price sets the company's market value, which affects its borrowing terms, its ability to buy a rival with shares, and the value of executive share awards.
Think of it
A stock exchange is like a giant car auction house. Just as the auction brings buyers and sellers together to determine the fair market price of used cars based on demand, the stock exchange brings buyers and sellers together to determine the fair price of company shares.
Formula
Calculation
Turnover ratio = Value of shares traded in the year / Total market capitalisation of listed companies
Suppose the companies listed on a regional exchange have a combined market capitalisation of $120,000,000,000. Over the year, the total value of shares traded on that exchange is $60,000,000,000. Turnover ratio = 60,000,000,000 / 120,000,000,000 = 0.5, or 50%. This means that, on average, half of the market's total value changed hands during the year, which is a simple way to compare how active two exchanges are.Case study
Seen in the real world
Harbourline Foods is an illustrative, fictional packaged-food business that had grown mostly on bank loans. Its owners were proud of the independence, but interest payments were absorbing a large share of every profitable year.
The chief financial officer proposed listing on a national exchange. The costs were real, including underwriting fees, legal work and an ongoing reporting burden, and the team estimated about $2,400,000 in one-off costs against $40,000,000 of new share capital.
The proceeds repaid most of the bank debt, and cheaper funding followed. In this illustrative story the board's main lesson was that a listing is a long-term commitment to public scrutiny as much as a fundraising event.
Watch out
Common mistakes
- Believing the company receives money every time its shares are traded, when it only receives cash when it issues new shares.
- Treating an exchange and an index as the same thing, when one is a venue and the other is a calculated score.
- Assuming a listing is only a fundraising tool and ignoring the ongoing cost of reporting, compliance and investor relations.
Questions
People also ask
Can a company be listed on more than one exchange?
Yes, this is called a dual listing, and it can widen the pool of investors, though it also adds cost and reporting duties.
What happens if a company stops meeting the exchange's rules?
The exchange can issue warnings and ultimately delist the company, which usually hurts the share price because many funds are not allowed to hold unlisted shares.
Who regulates a stock exchange?
Exchanges are supervised by a national financial regulator and also set their own listing rules, so a company answers to both.