How Does the Stock Market Work?

The stock market is a broad network of exchanges and other venues where people buy and sell shares of publicly traded companies. Think of it as a giant matchmaker that connects those who want to invest in businesses with those who want to sell their ownership stakes.

There are dozens of stock markets. Some of the biggest include the US-based New York Stock Exchange (NYSE) and Nasdaq Stock Market, the Shanghai Stock Exchange in China, and Europe’s Euronext. All of these venues make up “the stock market,” which forms a global marketplace for investing.

What Counts As a Stock?

Stocks represent ownership in a company. When you own a share of a company, you literally own a small piece of that business. The stock market allows these pieces to be bought and sold openly.

This system is crucial to modern economies: it enables money to flow from investors to businesses, which funds growth and innovation. In return, investors have a chance to share in a company’s success. There are three main kinds of stocks:

• Common Stocks: The most typical form, these stocks award shareholders voting rights and the potential to earn dividends and capital gains.
• Preferred Stocks: Preferred stockholders usually don’t have voting rights but receive fixed dividends and are paid before common shareholders if the company is liquidated.
• Employee and Restricted Stocks: Companies may issue shares to employees as part of compensation. These can include restricted stock units (RSUs) or stock options. They often have conditions before they can be sold.

Why Do Companies Sell Shares?

When a company reaches a certain size or needs capital, it can choose to “go public.” Going public means the company sells shares of ownership to the public through an Initial Public Offering (IPO). In an IPO, the company issues new shares and sells them to investors, receiving cash in return. This is called the primary market, where the business is selling part of itself to raise funds.

The money raised might be used to expand operations or hire more people. In the US, companies must register with the Securities and Exchange Commission (SEC) and publicly disclose financial information before selling shares to the public. This transparency enables investors to make informed decisions about buying the stock.

Once a company’s shares are out in the public, they start trading on the stock market. This is called the secondary market and is usually what we mean by “the stock market.” In the secondary market, investors trade shares with each other.

How to Make Money from the Stock Market

Stocks are an asset that can be used to grow wealth. If the company does well, for instance, its stock price may rise, and you can later sell your shares for a profit. This profit is known as a capital gain. Another way to earn money from stocks is through dividends — when a company pays part of its profits back to shareholders. 

There are generally two approaches to using stocks to generate returns: investing and trading. Investors typically buy and hold shares for the long term, aiming to benefit from sustained growth and compounding returns. Traders, on the other hand, focus on short-term price movements and seek to capitalize on market volatility. 

Of course, investing in stocks always comes with risks. Stock prices can go down as well as up, and there's no guarantee you'll make money. In fact, you could lose part or even all of your investment if a company performs poorly. 

However, over the long term, stocks have historically provided high returns. This isn’t just conventional wisdom. Recent CFA analysis proves that stocks are valuable investments and a key means of building wealth. The key is that when you own stocks, your financial fortunes are tied to the company’s fortunes: if the company prospers, you share in that upside. If it struggles, your shares may drop in value.

That’s why it’s so important to understand the market and choose stocks that align with your personal investing or trading strategy. As we say at Socrates, knowledge is power. The more market insight you have, the more informed your decisions can be.

How Stocks Are Traded

So how does the actual trading happen? In modern markets, trading mostly takes place on electronic platforms. These trades work by:

• Placing an Order: Suppose you decide to buy 100 shares of a company. You’ll likely use a brokerage account through an online broker or trading app to place a buy order. You specify how many shares you want and at what price. Alternatively, you could choose a market order that buys at the current price automatically.
  

• Matching Buyers and Sellers: Your order goes into the stock exchange’s system. The exchange acts like a marketplace or auction house by looking for someone willing to sell shares at the price you’re offering. Every stock has a bid price (what buyers are willing to pay) and an ask price (what sellers want to receive) at any moment. If your bid meets a seller’s ask, a trade can occur.
  

• Trade Execution: When a match is found, the trade is carried out electronically. Your cash is exchanged for the seller’s shares.
  

• Price Update: The price at which your trade happened becomes the latest trading price for that stock. If your purchase price was higher than the previous price, it may nudge the stock’s price up a bit, and vice versa if it was lower. Stock prices continuously update throughout the day as trades occur. This constant price negotiation is what you see when you watch stock tickers.

Behind the scenes, there are additional mechanics. But the core idea is that the stock market brings buyers and sellers together and lets them transact in a fair, orderly way.

What Influences Stock Prices?

Supply and demand greatly impact prices. If more people want to buy a stock than sell it, demand exceeds supply, and the price tends to rise. If more want to sell than buy, the price falls as sellers compete to find buyers.

Many factors affect supply and demand. The most important factor is often company performance. If a company announces strong earnings or exciting news, investors become optimistic about its future. Good news can attract more buyers, driving the stock up. On the other hand, bad news like a scandal or product failure can scare investors into selling. 

Broad economic trends play a role, too. Interest rate changes, inflation, employment data, or GDP growth can influence investor sentiment across the entire market. For example, if the overall economy is strong, many companies tend to do well, which can lift stock prices generally. Conversely, during a recession or economic crisis, even solid companies might see their stock prices fall as investors worry about the future. 

Sometimes prices move due to investor psychology. If investors as a whole feel optimistic (often called a “bullish” sentiment), they are more likely to buy stocks, pushing prices up. If fear takes over (“bearish” sentiment), selling can accelerate, and prices drop. Day to day, a stock might swing up or down for any number of reasons, including rumors or traders’ rapid reactions.

Investing in the Stock Market

For beginners, understanding how the stock market works is a foundational step in the journey to becoming a confident investor. While there’s a lot more to learn, the core idea is simple: stocks represent ownership, and the stock market is where those ownership pieces change hands.

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