
Why do stock prices go up and down so much?
You'll usually see prices go up and down by a percentage point or two, with occasional larger swings. But sometimes, events can occur that cause shares to rise or fall sharply. Increased trading could be caused by an earnings report that shows good or bad financial news.
Why do stock prices go down when buying another company?
The important things to grasp about this subject are the following:
- At the most fundamental level, supply and demand in the market determine stock price.
- Price times the number of shares outstanding (market capitalization) is the value of a company. ...
- Theoretically earnings are what affect investors' valuation of a company, but there are other indicators that investors use to predict stock price. ...
How do you calculate stock price change?
- First, calculate the difference between $22 (the initial value) and $26 (the final value). This will allow you to find how much the price has increased. ...
- Next, divide the $4 by the $22. This will give you a decimal. ($4 ÷ $22 = 0.18)
- Multiply the 0.18 by 100 to get a percentage. (0.18 × 100 = 18%)
What causes stock prices to change?
The key points to remember about this subject are the following:
- Stock prices, at the most fundamental level, is determined by supply and demand.
- The value of a company is not determined by just comparing the share price of two companies. ...
- It is not only by the way of earnings that a company’s stock prices are affected, but also through investor sentiments, attitudes and expectations.

What are 3 reasons why stock prices change?
Unfortunately, there is no clean equation that tells us exactly how the price of a stock will behave. That said, we do know a few things about the forces that move a stock up or down. These forces fall into three categories: fundamental factors, technical factors, and market sentiment.
Why do stock prices change every second?
Stock prices change every second according to market activity. Buyers and sellers cause prices to change and therefore prices change as a result of supply and demand. And these fluctuations, supply, and demand decide between its buyers and sellers how much each share is worth.
What is the 3 day rule in stocks?
In short, the 3-day rule dictates that following a substantial drop in a stock's share price — typically high single digits or more in terms of percent change — investors should wait 3 days to buy.
Who actually changes the stock price?
Generally speaking, the prices in the stock market are driven by supply and demand. This makes the stock market similar to other economic markets. When a stock is sold, a buyer and seller exchange money for share ownership. The price for which the stock is purchased becomes the new market price.
What is the principal theory of stock price?
That being said, the principal theory is that the price movement of a stock indicates what investors feel a company is worth. Don't equate a company's value with the stock price. The value of a company is its market capitalization, which is the stock price multiplied by the number of shares outstanding. For example, a company that trades ...
How to determine the value of a stock?
The important things to grasp about this subject are the following: 1 At the most fundamental level, supply and demand in the market determine stock price. 2 Price times the number of shares outstanding (market capitalization) is the value of a company. Comparing just the share price of two companies is meaningless. 3 Theoretically earnings are what affect investors' valuation of a company, but there are other indicators that investors use to predict stock price. Remember, it is investors' sentiments, attitudes, and expectations that ultimately affect stock prices. 4 There are many theories that try to explain the way stock prices move the way they do. Unfortunately, there is no one theory that can explain everything.
What is price times the number of shares outstanding?
Price times the number of shares outstanding (market capitalization) is the value of a company. Comparing just the share price of two companies is meaningless. Theoretically earnings are what affect investors' valuation of a company, but there are other indicators that investors use to predict stock price. Remember, it is investors' sentiments, ...
Can you predict how stocks will change?
The best answer is that nobody really knows for sure. Some believe that it isn' t possible to predict how stocks will change in price while others think that by drawing charts and looking at past price movements, you can determine when to buy and sell.
Importance of Price
It’s important for anyone who wants to invest to know how their investment vehicle determines price. If you’re investing in real estate, you’re going to look at house comps, square footage, number of rooms, etc. If you’re investing in treasury bills or bonds, you’re going to look at inflation rates and interest. Stocks are the same way.
Supply and Demand
Like almost everything else in the world, the price of a company’s stock follows the very simple rule of supply and demand. Unlike almost everything else in the world, the price of a stock is an almost instantaneous reflection of supply and demand.
What Might Impact This
It’s impossible to know what everyone is thinking at every point in time, so it’s impossible to predict with 100% certainty where a stock price will go. That being said, there are a few major things that have historically INFLUENCED the price of a stock. Here they are:
Only Invest in What You Understand
Generally speaking, it’s wise to only invest in what you understand. If not, then only invest what you’re willing to lose.
Recap
Why do stock prices change? Simple. Supply and demand. The more people want a stock, the higher the price will go. The fewer people want a stock, the lower the price will go. The tricky part is to pinpoint exactly how much supply and demand there is. There are a few things that have historically proven to impact a stock’s price:
Other Suggestions
Jeff is a Harvard 2025 student passionate about making smart financial decisions both in school and in the workplace so that he can spend more time doing what he loves (like playing golf, spending time with family, and travelling).
What is the real driving force behind stock prices?
Stock traders rely on various indicators and complicated metrics to analyze the market. However, the real driving force behind stock prices is supply and demand. The stock market is not that complicated, and it operates like an auction. The sellers represent the supply side while the buyers are the demand.
Is the stock market safe?
Compared to other securities, stock markets are one of the safest investments. This is because stocks are less volatile compared to other markets. However, this doesn’t mean stock prices don’t change. The only difference is that the change is more gradual. Profiting from the stock market requires the ability to predict market trends. We hope this article helps you understand how the stock market works.
Do businesses operate in a vacuum?
Businesses don’t operate in a vacuum; prevailing economic conditions have an impact. A collection of these statistics is what makes up financial data. Investors use the information to predict future market conditions. Here are the major economic data investors to look at.
Why do potential buyers have to bid higher to buy a stock?
As a result, potential buyers must bid higher to buy the stock, and the stock price moves up. This works the other way as well.
What does "buy low and sell high" mean?
This advice is the simplest explanation for how people make money in the stock market, but it falls short in explaining why the highs and lows actually happen.
What is the reaction of an investor to new information?
Of course, every investor reacts to new information differently, and those reactions can range widely from apathy to panic to euphoria. Depending on their reaction, investors may choose to buy more shares, hold the shares they have, or even sell.
What is the stock market?
The stock market is essentially an auction in which buyers and sellers negotiate prices for shares of ownership in publicly traded companies. Traders on the stock market can be individuals, governments, corporations, institutions, or asset management companies.
How does supply affect stock prices?
Because the stock market functions as an auction, when there are more buyers than there are sellers, the price has to adapt or no trades are made. This tends to drive the price upwards, increasing the market quotation at which investors can sell their shares and enticing investors to sell who had previously not been interested in selling.
What happens when two parties agree on a price?
When the two parties agree upon a price, the trade is matched, and that becomes the new market quotation for the stock. The buyers and sellers can be individuals, corporations, institutions, governments, or asset management companies that are managing money for private clients, mutual funds , index funds, or pension plans.
What are the factors that affect the price of stocks?
Like any other market, supply and demand is the primary factor driving the price of stocks. Other factors, such as major financial news, natural disasters, investor reaction to company financials, or pricing speculation can cause large price fluctuations.
What does volume mean in trading?
In many cases, you won't have any idea who is on the other side of the trade. The number of shares traded is called the " trading volume ," and it can indicate how "hot" a particular stock is or how much interest there is in it from other investors. It can also give traders an idea of how easy it will be to get into or out ...
Why is my trading going up?
Increased trading could be caused by an earnings report that shows good or bad financial news. It may be a major financial news event, such as an interest rate hike, or it could even be a natural disaster, such as a hurricane, that is likely to have far-reaching consequences.
Is the stock market an auction?
The Stock Market Is an Auction. First, realize that the stock market is, in essence, an auction, with one party wanting to sell its ownership in a particular company, and another party wanting to buy ownership. When the two parties agree upon a price, the trade is matched, and that becomes the new market quotation for the stock.
Why do stock prices close after hours?
During after-hours and premarket trading, stock prices change for multiple factors. Company-specific factors, such as earnings announcements, can affect prices, as can global developments. Global news tends to have a more pronounced effect in premarket trading, reflecting Asian and European markets.
How after-hours trading differs from normal trading
Trades after hours are completed through electronic communication networks, without the involvement of an exchange. Also, after hours, you can't place market orders (the market isn't open), just limit orders. In the latter, you specify the price at which you want a trade to be executed.
After-hours trading is riskier
In general, after-hours trading is riskier than normal trading. As there are fewer market participants in after-hours and premarket trading, stock prices can be more volatile.
Robinhood provides after-hours trading
Robinhood offers users after-hours and premarket trading, though for shorter windows. The app allows after-hours trading from 4 p.m. to 6 p.m. ET, and premarket trading for only 30 minutes before markets open.

What Is The Stock Market?
Supply and Demand
- Stock traders rely on various indicators and complicated metrics to analyze the market. However, the real driving force behind stock prices is supply and demand. The stock market is not that complicated, and it operates like an auction. The sellers represent the supply side while the buyers are the demand. Sellers have two options when they want to...
What Causes Traders to Buy Or Sell Stocks?
- Understanding supply and demand is one thing. However, you need to know what causes the supply and demand to change in the first place. This way, you are not caught by surprise. Traders usually buy or sell their stocks based on specific information. Here are some of the factors that cause traders to buy or sell stocks.
Final Thoughts
- Compared to other securities, stock markets are one of the safest investments. This is because stocks are less volatile compared to other markets. However, this doesn’t mean stock prices don’t change. The only difference is that the change is more gradual. Profiting from the stock market requires the ability to predict market trends. We hope this article helps you understand how the …