The Worst Stock Market Crashes in History – And How to Prepare for the Next One

You've probably heard before that those who do not learn from history are doomed to repeat it.

This saying holds true for many things, including investing.

Preparing for a stock market crash requires looking at history. The biggest stock market crashes provide a unique window into what causes the crashes, helping us predict when the next crash might take place.

The Biggest Stock Market Crashes in History

1. The Wall Street Crash of 1929

The stock market began right around 1600, but the Black Tuesday stock market crash of 1929 remains the worst in U.S. history.

What happened: During the "roaring twenties", the Dow Jones Industrial Average increased sixfold from 63 in August 1921 to a record high of 381 in September 1929. This was fueled by a booming bull market and rampant speculation.

Margin investing enabled many investors to borrow money to buy stocks. It caused stock prices to soar about 20% a year from 1922–1929. However, cracks appeared as economic activity slowed and earnings expectations became overinflated.

On Black Monday (October 28, 1929), the Dow suffered a sharp decline of nearly 13 percent. The following day, Black Tuesday, stocks sank almost 12 percent more. By mid-November 1929, the Dow had lost almost half its value, and the market crash was underway.

The crash frightened consumers and investors alike. It led to reduced purchases of big-ticket items and a dramatic rise in unemployment as companies slowed production.

The Federal Reserve system’s actions helped contain the crisis in the short run. However, the aftermath ushered in the Great Depression, the worst economic crisis of modern times.

The Dow did not return to its pre-crash heights until November 1954. In response, new financial regulations were introduced, including the creation of the SEC, to restore trust in Wall Street and the broader financial markets.

What we learned: The 1929 crash highlighted the danger of over-optimism in a bull market and the risks of unchecked speculation. Economists and legal advisors learned that central banks must be cautious when responding to equity prices and market moves to avoid unintended consequences.

The crash also demonstrated how a sharp decline in equity prices can quickly spill over into the broader economy. It impacted household wealth, employment, and consumer demand. The lessons of the Great Crash continue to inform investment strategies and wealth management approaches to this day.

2. The Stock Market Crash of 1987

What happened: Another one of the biggest stock market crashes in history occurred on October 19, 1987, when the Dow shed 22% in a single day, ending a five-year bull market.

It was a drop that came out of nowhere, and analysts are still largely in disagreement about what caused the stock market crash. While there were some warning signs, such as slowing economic growth and rising inflation risks, nothing in the economic climate pointed to such a severe and rapid market correction.

Surprisingly, the crash only lasted one day, and the market soon climbed back to its highs. However, investors were still left badly shaken by the sudden crash.

What we learned: What the Black Monday crash teaches us is that the market is a fickle beast. Stock markets can crash, resulting in sudden, sharp declines in stock prices across a major cross-section of the market, usually resulting in significant loss of paper wealth.

Although there is no strict numerical definition, declines of over 10% in a stock market index over a period of several days typically qualify as a crash or correction. The 1987 crash also demonstrated the unpredictable nature of market moves and the need for robust asset allocation and risk management strategies.

Seems bleak, but it does, however, also teach us a more optimistic lesson as well: the market tends to recover quickly from even the most dramatic crashes.

3. The Tech Bubble Crash of 1999

What happened: The 1990s were a period of rapid technological development, and the commercialization of the internet caused valuations of internet-based companies to soar.

Investors excited about the potential of investing in the “next big thing” threw their money into any company that had “.com” after it with abandon.

However, the hard lesson they soon learned was that most of these companies were doomed to fail.

In March of 2000, large companies began placing sell orders on their tech stocks, causing a panic that led to a 10% drop in the market within a few weeks.

By 2001, the majority of new tech companies – no longer propped up by investor money – disappeared from existence, causing hundreds of millions of dollars of investor money to go to zero.

What we learned: The tech bubble demonstrated how imitation and herd mentality can drive market bubbles and subsequent crashes. Many investors failed to analyze company fundamentals, such as management quality, competitive moat, and cash flow, instead chasing short-term trends.

The importance of carefully evaluating a company you’re going to own, no matter how trendy it might be, is the primary lesson we can learn from the tech bubble crash.

This crash reinforced the importance of sound investment strategies, thoughtful asset allocation, and resisting the urge to blindly follow the crowd—especially when it comes to emerging sectors like AI technologies and artificial intelligence.

Had investors taken more time to assess these companies’ fundamentals, including the management, the moat, cash flow, and other factors, rather than blindly hoping they were investing in the next big thing, much of the pain of the tech bubble bursting could have been avoided.

4. The Housing Market Crash of 2008

What happened: This is one you probably remember: the housing market collapse of 2008. Over the course of 2008, the Dow fell almost 34%, and it wasn't until early 2009 that it began to climb again.

It was triggered by the collapse of the subprime mortgage market. This led to widespread failures among financial institutions and a sharp drop in stock prices.

Rapidly rising interest rates increased borrowing costs and reduced corporate profitability, contributing to a severe downturn in the economy. As a result, household wealth was slashed. This led to decreased consumer spending on expensive items and a spike in unemployment.

This crisis, known as the Great Recession, was marked by falling equity prices, frozen credit markets, and a loss of confidence in securities and investment trusts. In response, new financial regulations were introduced, echoing the post-1929 creation of the SEC, in an effort to restore stability to the financial system.

As the name suggests, it was the real estate market that led to this collapse. However, the exact factors at play are complex, and economists disagree over whether the banks or the Fed share more responsibility for the crash.

What we do know, though, is that financial institutions were taking on risky loans thanks to declining foreclosure rates. The Federal Reserve Bank was also keeping the federal funds rate below 2%.

Once real estate prices began to drop and the federal funds rate began to rise, credit in the US froze, leading to an economic collapse.

What we learned: The lesson behind the housing market collapse is that companies are often affected by factors outside their control, meaning that investors must keep an eye on all economic conditions. It emphasized how interconnected financial markets, banks, and the real estate sector truly are.

The real estate market and the stock market are two entirely different markets, yet the collapse of one quickly led to the collapse of the other. Nevertheless, most high-quality companies survived the crash and soon went on to climb to the highs we see today.

5. The Stock Market Crash of 2020

What happened: One of the most significant crashes in recent memory occurred in 2020, when a decade-long bull market came to a sudden halt due to the onset of the COVID-19 pandemic. The S&P 500 fell 30% in just one month as pandemic-induced market forces exposed vulnerabilities in the global economy.

While the virus served as the immediate trigger, the crash was exacerbated by market weaknesses that had been building for years. Overvaluations and excessive risk-taking created a massive bubble ready to burst.

As history has shown, it doesn't take much for a market to crash; just the right (or wrong) combination of events.

By April 2020, U.S. unemployment had soared to 14.8%, the highest level since the Great Depression. In response, Congress passed the $2 trillion Coronavirus Aid, Relief, and Economic Security (CARES) Act, which helped stabilize the economy and delivered financial relief to millions of Americans.

Investors had several strategic options at their disposal. Many chose to invest their stimulus checks into low-cost exchange-traded funds (ETFs) or individual retirement accounts (IRAs), taking advantage of the market dip. Retired investors also benefited from a temporary suspension of required minimum distributions (RMDs), providing additional flexibility during a turbulent time.

The CARES Act helped kickstart a rapid recovery in stock prices. However, the long-term impacts of the pandemic—including supply chain disruptions, labor shifts, and increased national debt—continued to influence the market for years to come.

What we learned: Although the 2020 crash was unique in its catalyst, it followed patterns seen in previous market downturns: excessive optimism, a triggering event, and a rapid sell-off fueled by uncertainty and fear. The lesson? Crashes rarely unfold all at once, but instead reflect deeper vulnerabilities that have been building over time.

The years that followed confirmed what seasoned investors already knew—volatility is inevitable. The Federal Reserve's continued interventions, pandemic-related policies, and political changes (including a push for increased corporate taxes and national healthcare) contributed to ongoing fluctuations. But high-quality companies with strong fundamentals weathered the storm and ultimately emerged stronger.

Key Takeaways from Major Market Crashes

Throughout history, each bear market and market crash has revealed important lessons for investors, regulators, and policymakers alike. One of the most significant impacts of prolonged downturns is the reduction in market value. It's not just for individual stocks, but also for private pension funds, which can ultimately affect the expected sell value and future retirement payouts for many individuals.

Periods of excessive leverage often worsen the effects of a crash. Investors may be forced to sell assets quickly to meet margin calls, sometimes resorting to short selling. Rapidly rising interest rates can increase borrowing costs and reduce corporate profitability, often resulting in a drop in stock prices and weaker corporate earnings. In such environments, consumer spending may decline, and the Consumer Price Index can reflect these shifts in economic activity.

Additionally, new regulations frequently emerge in response to major crashes to help protect the integrity of financial markets. For individual investors, maintaining a diversified portfolio, including options like exchange-traded funds, remains a critical strategy for weathering future market turbulence and preserving long-term value.

What We're Seeing in 2026: Why Volatility Could Be a Good Thing

As of early 2026, market volatility remains front and center, fueled by questions around artificial intelligence spending, Federal Reserve rate cuts, and shifting global trade. Despite concerns about inflation risks, the CPI stayed relatively stable through 2025, and equity markets opened the year near record highs. For patient investors, this environment isn’t a cause for alarm—it’s an opportunity. Volatility like this can create rare chances to invest in wonderful companies at deep discounts and build generational wealth for the future.

Rather than trying to predict the exact bottom, we encourage investors to focus on buying wonderful companies on sale and to welcome the stormy “weather” of today's market as a long-awaited chance to invest at deep discounts.

Stock Market Predictions

As we move through 2026, investors should be prepared for anything. U.S. equity markets opened the year near record highs after a powerful rebound from the past year’s volatility. Stable consumer spending and improving corporate earnings have helped many investors look past the potential impacts of imported goods and tariffs. Although many economists expected these tariffs to push inflation higher, changes to the CPI stayed modest in 2025.

One of the biggest determinants you can use to predict whether or not the stock market will crash is the past. Turn to previous examples of market crashes for evidence of what happened and why it happened. Past performance offers valuable context, even if it doesn’t guarantee future results.

The good news is you’ve already started your research by reading this post. Continue to rely on history as your trusted guide to learning more about the present market.

And on one final note: always remember to take your time and be patient. Sometimes, the best course of action is to hold back and instead wait to see how the market trends before making your next investment decision.

How Rule One Investors Are Preparing for the Next Big Crash

This year, we continue to echo Warren Buffett's mantra: Be fearful when others are greedy and greedy when others are fearful. And right now, fear is rising, but not yet peaking. We haven't seen the full measure of fear enter the markets, and that's when true buying opportunities emerge.

In times of uncertainty, some investors seek safe havens like precious metals. Others focus on learning from the world’s historical market patterns. At Rule One, we caution against rushing into speculative bets or trying to guess market bottoms. Instead, Rule One Investors should:

• Build and refine a watchlist of wonderful businesses.

• Keep capital in short-term money market accounts earning 4%+ while they wait.

• Consider using options to reduce basis or generate income.

• Stay within their circle of competence and avoid uncertain plays like Chinese stocks or speculative crypto bets.

Most importantly, we recommend preparing emotionally: get comfortable with the idea that your stock could drop 50%, and know that you'll want to buy more—not sell—in that situation.

Learn from the Worst Stock Market Crashes in History

While market crashes can be intimidating, history shows they also provide the biggest windows of opportunity for disciplined investors. As we enter the new year, some signs point to a major correction—but that doesn't mean you should sit on the sidelines in fear. Stay ready. Build your watchlist. Learn to value businesses. And when wonderful companies go on sale, move in with confidence. That's how Rule One Investors turn crashes into comebacks.

If you're worried about stock market crashes, odds are you need to learn a little bit more about how to invest. This Stock Market Crash Survival Guide will help you prepare for the next market crash and help you cash in when the market drops!

Or better yet, come learn alongside our Rule One Mentors at the next investing workshop!

**Editor's Note (Updated February 2026): This article was originally published in 2020 and has been significantly updated in 2026 to reflect current examples and Rule 1 investing insights.