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Why Do Stock Prices Rise and Fall?
Stock prices rise and fall as supply and demand change at different price levels. Company performance, investor expectations, economic conditions, sentiment and liquidity all influence these movements.
How Do Stock Prices Move?
A stock price can rise or fall many times during a single trading day. But what causes these movements?
The simple answer is supply and demand. However, investors’ expectations, company news and wider economic conditions all influence how much people are willing to pay for a stock.
Buyers and sellers
Every stock transaction involves a buyer and a seller.
Buyers offer the price they are prepared to pay for a stock, while sellers set the price at which they are willing to sell. When these prices match, a trade takes place.
If buying interest is stronger than the number of shares available at the current price, buyers may offer more to complete their trades. This can push the stock price higher.
If more investors want to sell at the current price than buyers are willing to purchase, sellers may accept lower offers. This can cause the price to fall.
Example
Imagine a company’s stock is trading at $50.
The company announces stronger-than-expected profits, and more investors decide they want to own its shares. If there are not enough sellers at $50, buyers may start offering $51, then $52 or more.
The price rises until it reaches a level where enough shareholders are willing to sell.
The opposite may happen if the company reports disappointing results. More shareholders may try to sell, while buyers may only be interested at a lower price.
What changes supply and demand?
Many factors can change how investors view a company and, therefore, what they are willing to pay for its shares.
Company performance
Investors closely follow a company’s financial performance, including:
- Revenue
- Profit
- Costs
- Debt
- Cash flow
- Future growth plans
Strong results can increase demand for a stock, particularly if investors believe the company will continue to grow.
Weak results may reduce demand or encourage existing shareholders to sell.
However, stock prices do not always rise simply because a company reports a profit. Investors compare the results with what they had expected.
Expectations and announcements
Stock markets are forward-looking. This means investors are usually more interested in what may happen next than in what has already happened.
A company might report higher profits, but its share price could still fall if investors expected even better results.
Similarly, a company’s stock could rise after reporting a loss if the loss was smaller than expected or management provided a stronger outlook for the future.
Other announcements that may move a stock price include:
- The launch of a new product
- A change in senior management
- A merger or acquisition
- A major contract
- A dividend announcement
- A regulatory investigation
- A change in the company’s financial outlook
Economic conditions
Stock prices can also be affected by developments beyond the company itself.
Interest rates
Higher interest rates can increase borrowing costs for businesses and consumers. They can also make savings accounts and fixed-income investments more attractive compared with stocks.
Lower interest rates may reduce borrowing costs and support business activity, although their effect can vary across companies and sectors.
Inflation
Rising prices can increase a company’s costs. Whether this damages its profit depends partly on whether the company can pass these higher costs on to customers.
Economic growth
When the economy is growing, consumers and businesses may spend more. This can support company revenues and profits.
During an economic slowdown, spending may weaken and investors may become more cautious.
Industry and market news
News affecting an entire industry can move several stocks at the same time.
For example, a rise in oil prices may benefit some energy companies but increase costs for airlines and transport businesses.
New regulations, technological changes or disruptions to supply chains can also affect investors’ expectations for a particular industry.
A stock may therefore rise or fall even when the company itself has not made an announcement.
Investor sentiment
Prices are not driven only by financial figures. They can also be influenced by how confident or worried investors feel.
Optimism may encourage investors to buy stocks and accept higher prices. Fear or uncertainty may lead them to sell, sometimes causing sharp price movements.
Sentiment can change quickly in response to news, rumours or unexpected events. This is one reason why stock prices can move over the short term even when a company’s long-term financial position has not changed.
Trading volume and liquidity
Trading volume shows how many shares are being bought and sold over a particular period.
A stock with high liquidity usually has many active buyers and sellers. This can make it easier to trade without causing a large change in its price.
Less liquid stocks may move more sharply because fewer shares are available for trading. A relatively small order can therefore have a greater effect on the market price.
Short-term movements versus long-term value
In the short term, stock prices may react to headlines, expectations and changes in investor sentiment.
Over longer periods, prices tend to be influenced more by the company’s ability to generate revenue, manage its costs, remain financially stable and grow its profits.
This does not mean a strong company’s stock will always rise. The price investors paid, future risks and changing expectations can all affect their returns.
Quiz
Question 1
A company reports higher profits, but its stock price falls. What is the most likely explanation?
- A. Profitable companies always have falling stock prices
- B. Investors expected the company to report even stronger results
- C. Stock prices are unrelated to company performance
Correct answer: B
A stock price reflects expectations as well as actual results. If the results are weaker than investors expected, the price may fall even when the company remains profitable.
Question 2
What usually happens when buying interest exceeds the number of shares available at the current price?
- A. Buyers may offer higher prices
- B. The stock price must remain unchanged
- C. Sellers must stop trading
Correct answer: A
Buyers may need to offer more to encourage shareholders to sell, which can push the stock price higher.
Question 3
Why might a less liquid stock experience a sharp price movement?
- A. It always belongs to a small company
- B. It cannot be bought or sold
- C. Fewer active buyers and sellers mean one order can have a greater effect on the price
Correct answer: C
When fewer shares are available for trading, even a relatively small order can move the market price more significantly.
Sources
- https://www.investor.gov/introduction-investing/investing-basics/investment-products/stocks
- https://www.sec.gov/fast-answers/answersaskhtm.html
- https://www.nasdaq.com/articles/why-expectations-are-key-during-earnings-season
- https://www.stlouisfed.org/on-the-economy/2025/sep/what-causes-jumps-stock-prices
- https://fraser.stlouisfed.org/files/docs/historical/frbny/researchpapers/frbny_rp_8808.pdf
- https://www.nasdaq.com/articles/what-is-earnings-per-share-eps
- https://www.sec.gov/files/afterhourtrading.pdf
- https://www.sec.gov/fast-answers/answerstradinghalt
Frequently asked questions
What causes stock prices to rise and fall?
Stock prices move according to supply and demand. Strong buying interest may lead buyers to offer higher prices, while greater selling pressure may lead sellers to accept lower offers.
Why can a stock price fall when a company reports higher profits?
Investors compare company results with their expectations. A company’s share price could fall despite higher profits if investors expected even better results.
How do interest rates affect stock prices?
Higher interest rates can increase borrowing costs for businesses and consumers and make savings accounts and fixed-income investments more attractive compared with stocks. Lower rates may reduce borrowing costs and support business activity, although their effect varies across companies and sectors.
Why can less liquid stocks have larger price movements?
Less liquid stocks have fewer shares available for trading. A relatively small order can therefore have a greater effect on the market price.
What influences stock prices over the long term?
Over longer periods, prices tend to be influenced more by a company’s ability to generate revenue, manage costs, remain financially stable and grow profits. A strong company’s stock will not always rise, because the price investors paid, future risks and changing expectations can affect returns.
Related terms
Key takeaways
- Stock prices move according to supply and demand at different price levels.
- Strong buying interest can push a stock price higher, while greater selling pressure can push it lower.
- Company results affect prices, but investors also compare those results with their expectations.
- Announcements, economic conditions, interest rates and industry developments can change demand for a stock.
- Investor sentiment can cause short-term movements even when a company’s fundamentals have not changed.
- Less liquid stocks may experience larger price movements.
- Over the long term, a company’s financial performance and future prospects become increasingly important.
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