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How Are Stock Prices Determined in Real-Time?

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Knowing how stock prices are set in real time is useful for both new and experienced investors. Prices change constantly during the trading day based on available shares and demand from buyers. Though it sounds simple, complex systems and technologies drive these real-time valuations. A financial advisor can offer you additional insights for specific markets.

How Stock Price Is Determined

Stock prices reflect a company’s perceived value and are set by supply and demand. When more investors want to buy a stock than sell, the price rises. When more want to sell than buy, the price falls. This movement is influenced by factors like company performance, investor sentiment and economic conditions.

Financial health is a significant factor in what determines a company’s stock price. Investors closely monitor earnings reports, revenue growth and profit margins to gauge a company’s performance. Positive results increase demand and drive up its price, negative results do the opposite. 

Additionally, future growth prospects, such as new product launches or market expansions, can also impact investor interest and stock valuation. Market sentiment plays a role, too. News events, economic indicators such as different types of interest rates, inflation and employment figures, and geopolitical developments can all influence investors’ attitudes. For example, low interest rates often encourage borrowing and investing, which can lead to higher stock prices. 

How Market Cap Impacts Stock Price

Market capitalization, often referred to as market cap, represents the total market value of a company’s outstanding shares. It is calculated by multiplying the current share price by the total number of outstanding shares and provides investors with a quick snapshot of a company’s size and market value. This can impact investor perception and, consequently, stock prices.

The market cap of a company can significantly affect how investors perceive its stock. Investors often weigh the potential for growth against the perceived risk, influencing their buying and selling decisions. Companies with large market caps, often referred to as blue-chip stocks, are typically seen as safer investments due to their established market presence and financial stability. Smaller companies with lower market caps might be viewed as riskier investments, which can result in more volatile stock prices. 

How Stock Prices Can Change in Real Time

An investor reviewing her portfolio.

Stock prices change in real-time based on supply and demand. When demand rises, investors buy more shares, and the price may go up. But, if more investors are selling than buying, supply exceeds demand, which can lower the price. Real-time trading platforms and stock exchanges handle these trades, updating prices instantly as they happen.

Advanced technology drives real-time changes in stock prices. High-frequency trading algorithms and powerful software analyze large amounts of data and make trades in milliseconds. These keep prices aligned with the latest information, such as breaking news or shifts in investor sentiment. Electronic communication networks (ECNs) enable direct trading between buyers and sellers, speeding up price changes by bypassing traditional exchanges.

How to Know If a Stock Is Undervalued

Determining whether a stock is undervalued involves analyzing various financial metrics and market conditions. Investors often look at the price-to-earnings (P/E) ratio, which compares a company’s current share price to its per-share earnings. A lower P/E ratio might suggest that a stock is undervalued when compared with its peers. However, it’s important to consider the industry average, as different sectors typically have varying P/E ratios. 

Beyond ratios, investors should review the company’s balance sheet, focusing on assets, liabilities and equity. A strong balance sheet with manageable debt levels and ample cash reserves can indicate a company’s ability to weather economic downturns, making it a potentially undervalued investment. Furthermore, cash flow statements reveal how effectively a company generates cash from its operations, which is a critical factor in sustaining long-term growth and stability.

Bottom Line

An investor determining if a stock is undervalued.

Knowing how stock prices are set in real time can help investors in financial markets. This process is driven by supply and demand. When more investors want to buy a stock than sell it, the price generally rises. When more want to sell than buy it, the price tends to fall. This balance is influenced by factors like company performance, economic indicators and investor sentiment.

Investment Planning Tips

  • A financial advisor can help you analyze investments for your portfolio to lower your tax liability. Finding a financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with up to three vetted financial advisors who serve your area, and you can have a free introductory call with your advisor matches to decide which one you feel is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
  • If you want to sell an investment, SmartAsset’s capital gains calculator could help you estimate how much you could owe in taxes. 

Photo credit: iStock.com/Liubomyr Vorona, iStock.com/Drs Producoes, iStock.com/filadendron