Why Do 90% of Investors Fail?
There is a popular claim that 90% of investors fail.
But is that actually true?
Not exactly.
There is no single authoritative study showing that exactly 90% of all individual investors lose money or fail to achieve their financial goals. The real picture is more complicated. However, there is strong evidence that many investors underperform because of poor decisions, emotional behavior, excessive costs, lack of diversification, market timing, and failure to maintain a long-term strategy.
The U.S. Securities and Exchange Commission has identified several investor behaviors that can undermine investment performance, including excessive trading, panic and mania, momentum investing, familiarity bias, inadequate diversification, and focusing on past performance while ignoring fees.
Professional investors aren’t immune either. According to S&P Dow Jones Indices’ SPIVA U.S. Year-End 2025 report, 79% of actively managed U.S. large-cap equity funds underperformed the S&P 500 in 2025.
So while “90% of investors fail” is an oversimplification, the underlying lesson is important:
Many investors don’t fail because investing itself doesn’t work. They fail because their behavior prevents them from capturing the returns that markets can provide.
The good news is that most of these mistakes are avoidable.
Here are the 15 biggest investing mistakes that can destroy long-term wealth—and how to avoid them.
1. Trying to Get Rich Too Quickly
One of the biggest mistakes investors make is expecting investing to make them rich overnight.
Social media has made this problem worse.
Every day, investors see stories about someone who supposedly turned $10,000 into $1 million by buying the right stock, cryptocurrency, or option at exactly the right time.
These stories can create unrealistic expectations.
A normal long-term investment strategy may produce relatively modest returns in any individual year. But over several decades, compounding can become extremely powerful.
For example, consider an investor who contributes $1,000 per month and earns a hypothetical average return of 8% per year.
The investor contributes $120,000 over 10 years.
After 20 years, the portfolio could be worth approximately $589,000.
After 30 years, it could approach $1.49 million.
The numbers are hypothetical and actual returns will vary, but the principle is important:
Wealth is usually built through consistency and time—not by constantly searching for the next 10x investment.
Trying to become rich too quickly often causes investors to take excessive risks.
2. Chasing Hot Stocks
Another common mistake is buying an investment simply because it has recently gone up dramatically.
You see a stock increase 100%.
You buy it.
Then it falls 40%.
Why does this happen?
Because investors frequently confuse past performance with future potential.
A stock that has already risen significantly may continue rising, but it may also be extremely expensive relative to its underlying business.
The SEC specifically identifies momentum investing and focusing on past performance as behaviors that can undermine investment performance.
Instead of asking:
“How much has this stock already gone up?”
Ask:
- What does the company actually do?
- How fast are revenues growing?
- Is the business profitable?
- What are its competitive advantages?
- How much debt does it have?
- What valuation am I paying?
- What could cause the investment thesis to fail?
A great company can still be a bad investment if you pay an unreasonable price.
3. Trying to Time the Market
Market timing sounds attractive.
Buy before prices rise.
Sell before prices fall.
Then buy again at the bottom.
The problem is that consistently predicting short-term market movements is extraordinarily difficult.
Even professional fund managers struggle to outperform their benchmarks consistently.
SPIVA’s 2025 U.S. report found that 79% of active large-cap U.S. equity funds underperformed the S&P 500 during 2025.
Trying to perfectly time the market requires getting multiple decisions right:
- When to sell
- How much to sell
- When to buy
- How much to buy
- When to sell again
Missing just a small number of strong market days can significantly affect long-term returns.
A more sustainable approach for many investors is to establish an investment plan and continue contributing regularly rather than constantly trying to predict the next market move.
4. Panic Selling During a Market Crash
This may be one of the most expensive mistakes an investor can make.
Imagine you have $200,000 invested.
The market falls 30%.
Your portfolio is suddenly worth approximately $140,000.
You panic.
You sell everything.
A year later, the market begins recovering.
But you’re still sitting in cash.
Now you have another problem:
When do you buy back in?
If you wait for “certainty,” prices may already have recovered substantially.
Vanguard emphasizes the importance of maintaining a long-term perspective and avoiding impulsive reactions to market volatility.
Market crashes are uncomfortable.
But volatility is part of investing.
The objective isn’t to eliminate every decline.
The objective is to build a portfolio you can realistically hold through difficult periods.
5. Putting Too Much Money Into One Investment
Concentration can create enormous wealth if you choose the right investment.
It can also destroy wealth if you’re wrong.
Suppose 80% of your portfolio is invested in one company.
Even if you strongly believe in that company, unexpected events can occur:
- Earnings disappoint
- A competitor develops better technology
- Regulation changes
- Management makes a major mistake
- Demand collapses
- The company faces legal problems
- The industry becomes obsolete
Diversification doesn’t guarantee profits or eliminate losses, but spreading investments across different assets can reduce portfolio-specific risk. The SEC’s Investor.gov guidance emphasizes asset allocation and diversification as important components of investing.
The question isn’t whether you should diversify.
The better question is:
How much concentration can you afford without putting your financial future at risk?
6. Investing Without a Financial Goal
Many investors open a brokerage account before deciding what they are actually trying to accomplish.
They buy stocks.
They watch the portfolio.
They buy something else.
But there is no clear objective.
That’s a problem.
Your investment strategy should be connected to a goal.
Examples include:
- Retiring at age 60
- Building $1 million in investments
- Paying for a child’s education
- Buying a home
- Creating passive income
- Achieving financial independence
Your goal determines your:
- Time horizon
- Risk tolerance
- Savings rate
- Asset allocation
- Required return
Vanguard identifies clear investment goals as one of its four core principles for investing success.
Without a goal, investors are more likely to react emotionally to short-term market movements.
7. Ignoring Investment Fees
Fees may look small.
A 0.25% annual fee doesn’t sound significant.
But investment costs compound over time.
Suppose you have $100,000 invested.
Even a small difference in annual expenses can become substantial over decades because money paid in fees is money that is no longer available to compound.
The SEC’s July 2025 Investor Bulletin specifically warns that investment fees and expenses can have a major impact on portfolio value over time.
Before investing, check:
- Expense ratios
- Advisory fees
- Trading commissions
- Account fees
- Fund expenses
- Other transaction costs
Vanguard also emphasizes minimizing investment costs because investors keep more of their returns when costs are lower.
A return you don’t have to pay for is often better than a return you have to share with unnecessary fees.
8. Trading Too Frequently
Many investors believe that more activity means better results.
It doesn’t.
Buying and selling constantly can create:
- Higher trading costs
- More taxable events
- Emotional decisions
- Short-term thinking
- Increased portfolio turnover
The SEC has identified active trading as one of the behaviors that can undermine investor performance.
Imagine an investor who checks the market every 10 minutes.
A small decline appears.
They sell.
The market rebounds.
They buy back.
Then another decline occurs.
They sell again.
The investor isn’t following an investment strategy anymore.
They’re reacting to noise.
Successful investing often requires doing less—not more.
9. Following Investment Advice From Social Media
TikTok, YouTube, Reddit, X, Facebook and other platforms can be useful sources of information.
But they can also be dangerous places to make investment decisions.
The SEC issued a specific investor alert in February 2026 warning that stock recommendation scams can spread through social media. The agency advises investors not to make investment decisions solely on information from social media platforms or apps.
Red flags include:
- “Guaranteed” returns
- “Risk-free” investments
- “100% upside”
- Secret information
- Pressure to invest immediately
- Celebrity endorsements
- Anonymous investment groups
- Claims that “everyone is buying”
If someone tells you that an investment is guaranteed to make huge returns with little risk, be extremely skeptical.
The SEC states clearly that every investment involves risk and that promises of high returns with little or no risk are classic warning signs of investment fraud.
Use social media for ideas.
Don’t use it as your only source of due diligence.
10. Confusing a Great Company With a Great Investment
This is a subtle but extremely important mistake.
A company can be excellent while its stock is overpriced.
Imagine a wonderful company growing 20% per year.
Sounds attractive.
But suppose investors are already paying an enormous valuation for that growth.
If future growth disappoints, the stock could fall even if the company remains successful.
When evaluating an investment, consider both:
Business quality + Price
not simply:
Business quality
This distinction is particularly important during periods when investors become excited about technologies such as artificial intelligence, robotics, biotechnology, or other emerging industries.
A great technology does not automatically mean every company associated with that technology will produce great investment returns.
11. Using Too Much Leverage
Borrowing money to invest can dramatically increase potential returns.
It can also dramatically increase losses.
Suppose you invest $50,000 of your own money.
You borrow another $50,000.
Now you control $100,000 of investments.
If the investment rises 20%, you make $20,000 before financing costs.
That’s a 40% return on your original $50,000.
Sounds great.
But if the investment falls 20%, you lose $20,000.
That’s a 40% loss of your original capital.
And the situation can become much worse when markets fall sharply.
Leverage can create forced selling, margin calls and permanent losses.
For most long-term investors, building wealth without excessive leverage can make the journey more sustainable.
12. Investing Money You May Need Soon
Stocks are generally designed for long-term investing, not money you need next month.
Imagine you need $30,000 for a home down payment in six months.
You invest the entire amount in stocks.
Then the market falls 25%.
Suddenly, your $30,000 becomes $22,500.
You still need the $30,000.
Now you have a problem.
This is why your investment horizon matters.
Money needed for short-term obligations generally needs a different risk profile from money intended for retirement decades away.
Investor.gov notes that asset allocation should take into account factors such as an investor’s time horizon and risk tolerance.
A portfolio should match the job the money needs to perform.
13. Letting Emotions Control Investment Decisions
Fear and greed are powerful forces.
When markets rise rapidly, investors can become greedy.
They believe prices will continue rising forever.
When markets collapse, fear takes over.
They believe the financial system is about to collapse.
Both reactions can lead to poor decisions.
The SEC’s research on investor behavior identifies phenomena such as manias and panics as behaviors that can undermine investment performance.
A written investment plan can help.
Before investing, establish rules such as:
- How much you invest each month
- What percentage goes into different assets
- When you rebalance
- What risks you are willing to accept
- What circumstances would justify selling
Then follow the plan.
Your goal is to make decisions based on your strategy—not your emotions.
14. Believing Past Performance Guarantees Future Returns
A stock that performed exceptionally well over the past five years may not perform similarly over the next five.
A fund that was the best performer last year may not be the best performer next year.
Investment returns are uncertain.
The SEC warns investors about relying too heavily on past performance and specifically lists focusing on past performance as a behavior that can undermine results.
When evaluating an investment, ask:
Why did it perform well?
Then ask:
Can the underlying conditions that produced that performance continue?
That’s much more useful than simply looking at a five-year return chart.
15. Failing to Stay Invested Long Enough
Perhaps the biggest mistake of all is simply giving up.
Investing can feel boring.
There may be months or even years when your portfolio seems to go nowhere.
Then a major bull market arrives.
The investors who remained invested participate.
Those who left don’t.
Compounding requires time.
The longer your money remains invested, the more opportunity it has to generate returns on previous returns.
This is why long-term discipline is so important.
Vanguard’s investing framework emphasizes four principles:
- Goals
- Balance
- Cost
- Discipline
The fourth principle is particularly important because an excellent investment strategy is useless if an investor abandons it whenever markets become uncomfortable.
The Hidden Problem: Lifestyle Inflation
There is another mistake that doesn’t directly involve buying or selling investments.
It’s spending every increase in income.
Suppose you receive a $15,000 raise.
Instead of investing some of it, you upgrade your:
- Car
- House
- Vacation
- Electronics
- Restaurants
- Subscriptions
Your income increased.
But your ability to build wealth didn’t increase much.
Lifestyle inflation can quietly prevent high-income earners from becoming wealthy.
One of the most effective strategies is to automatically increase your investment contributions whenever your income rises.
For example:
50% of every raise → investing
The exact percentage is up to you.
The principle is what matters.
The Biggest Difference Between Successful and Unsuccessful Investors
Successful investors aren’t necessarily better at predicting the future.
They may simply be better at controlling the things they can control.
You cannot control:
- The Federal Reserve
- Inflation
- Geopolitical events
- Corporate earnings
- Market crashes
- Interest rates
- Investor sentiment
But you can control:
- How much you save
- How much you invest
- Your asset allocation
- Your diversification
- Your investment costs
- Your time horizon
- Your use of leverage
- Your behavior
Vanguard similarly emphasizes focusing on factors investors can control, including savings, diversification, costs, and discipline.
This is a powerful way to think about investing.
Stop trying to control the market. Start controlling your behavior.
A Simple Strategy to Avoid Most Investing Mistakes
You don’t need a complicated system to avoid the majority of these mistakes.
A simple framework can look like this:
Step 1: Define your goal
Determine what you’re investing for.
For example:
“I want $2 million invested by age 60.”
That’s much better than:
“I want to make money in the stock market.”
Step 2: Determine your time horizon
A 30-year retirement goal can tolerate more market volatility than money needed for a house next year.
Your time horizon should influence your asset allocation.
Step 3: Build a diversified portfolio
Avoid putting your entire financial future into one stock, sector, cryptocurrency or investment idea.
Diversification can help reduce the impact of a single investment performing poorly.
Step 4: Keep costs low
Compare investment fees carefully.
Small differences can compound over decades.
Step 5: Invest regularly
Automating contributions can reduce emotional decision-making.
For example:
$1,000 every month
rather than:
“I’ll invest when the market looks safe.”
Step 6: Rebalance periodically
Your portfolio may drift away from your intended allocation as different investments rise and fall.
Periodic rebalancing can help restore your target allocation.
Step 7: Ignore most market noise
You don’t need to react to every headline.
Markets will always have:
- Bull markets
- Bear markets
- Recessions
- Recoveries
- Crashes
- Booms
Your investment strategy should be designed to survive these cycles.
The 90% Rule: What Should Investors Actually Learn?
The idea that “90% of investors fail” is catchy, but the number itself shouldn’t be treated as a proven universal statistic.
The more important lesson is this:
Investors can significantly hurt their own results through avoidable behavior.
The evidence is clear that many active professional managers struggle to outperform their benchmarks. In 2025, 79% of active large-cap U.S. equity funds underperformed the S&P 500 according to SPIVA.
The SEC has also identified numerous behaviors that can undermine investor performance, including excessive trading, panic, momentum investing, inadequate diversification and ignoring fees.
Therefore, the goal shouldn’t be to become the smartest investor in the room.
It may be more useful to become the investor who makes fewer costly mistakes.
10 Rules for Becoming a Better Long-Term Investor
If you remember nothing else from this article, remember these ten rules:
1. Don’t expect to get rich overnight.
Wealth usually takes time.
2. Don’t chase whatever is currently popular.
Popularity isn’t the same as value.
3. Don’t try to predict every market movement.
Nobody consistently knows what the market will do next.
4. Don’t panic during crashes.
Volatility is part of investing.
5. Diversify.
Don’t allow one investment to determine your financial future.
6. Control investment costs.
Fees compound just like returns.
7. Invest consistently.
Regular contributions can make the process easier.
8. Don’t blindly follow social media.
Research before investing.
9. Avoid excessive leverage.
A strategy that can make you rich can also make you poor.
10. Stay invested for the long term.
Time is one of the most powerful advantages available to an investor.
Final Thoughts: Investors Usually Fail From Behavior, Not Lack of Opportunity
Investing has never been easier for ordinary Americans.
Today, investors can access:
- Low-cost index funds
- ETFs
- Individual stocks
- Retirement accounts
- Educational resources
- Financial research
- Automated investing
- Professional financial advice
The problem isn’t necessarily a lack of opportunity.
The problem is often behavior.
Investors chase stocks after huge rallies.
They panic during crashes.
They trade too frequently.
They pay unnecessary fees.
They concentrate their portfolios.
They use too much leverage.
They believe social media influencers.
They try to predict every market movement.
And they abandon long-term strategies when investing becomes uncomfortable.
These mistakes can compound just as powerfully as investment returns.
The good news is that you don’t need to be perfect.
You don’t need to predict the next bull market.
You don’t need to find the next Nvidia.
You don’t need to buy at the exact bottom.
You don’t need to sell at the exact top.
Instead, focus on a few fundamentals:
Save consistently.
Invest regularly.
Diversify.
Control costs.
Avoid unnecessary leverage.
Have a clear goal.
Stay disciplined.
Give your money time to compound.
The most successful investor may not be the person who makes the most spectacular investment.
It may be the person who avoids the most damaging mistakes.
And that’s the real lesson behind the idea that “90% of investors fail”:
You don’t have to outperform everyone else. You simply need a strategy that you can follow consistently for a very long time.
Frequently Asked Questions
Is it true that 90% of investors fail?
Not as a universal statistic. There is no single authoritative study proving that exactly 90% of all investors fail. The phrase is better understood as a warning about how common poor investment behavior can be.
What is the biggest investing mistake?
There isn’t one mistake that affects everyone. However, emotional decision-making, excessive trading, poor diversification, chasing performance, high costs and attempting to time the market are among the most common problems.
Why do investors lose money?
Investors can lose money because of market declines, poor investment selection, excessive concentration, leverage, fraud, emotional decisions or investing in assets they don’t understand.
How can I avoid common investing mistakes?
Create a clear financial goal, diversify your portfolio, control fees, invest consistently, avoid excessive leverage, research investments carefully and maintain a long-term perspective.
Is buying individual stocks a bad idea?
Not necessarily. Individual stocks can play a role in a portfolio, but concentrated positions can create significant risk. Investors should understand the company and valuation and consider how the position affects overall portfolio diversification.
Should I sell when the stock market crashes?
There is no universal answer because the appropriate action depends on your financial circumstances, investment horizon and portfolio strategy. However, panic selling can turn temporary market declines into permanent losses. A well-designed long-term investment plan should account for market volatility.
Can social media help me choose investments?
Social media can provide ideas and information, but it should not be your sole source of investment research. The SEC specifically warns investors about stock-tip scams and misleading investment information on social media.
What is the most important quality of a successful investor?
Discipline is arguably one of the most important qualities. A good strategy is only useful if you can follow it through bull markets, bear markets and periods of uncertainty.
References
- U.S. Securities and Exchange Commission (SEC) – Investor.gov. Investor Bulletin: Behavioral Patterns of U.S. Investors. Discusses investing behaviors that can undermine investment performance, including active trading, momentum investing, manias and panics, and inadequate diversification.
Read the SEC Investor Bulletin - U.S. Securities and Exchange Commission (SEC) – Investor.gov. Investor.gov Tips for 2026. Covers asset allocation, diversification and other important considerations for investors.
Read the SEC Investor Tips for 2026 - U.S. Securities and Exchange Commission (SEC) – Investor.gov. How Fees and Expenses Affect Your Investment Portfolio. Explains how investment fees and expenses can reduce long-term portfolio growth.
Read the SEC Investor Bulletin on Fees - U.S. Securities and Exchange Commission (SEC) – Investor.gov. Social Media and Stock Tip Scams – Investor Alert. Provides current warnings about investment scams and stock recommendations promoted through social media.
Read the SEC Social Media Stock Scam Alert - U.S. Securities and Exchange Commission (SEC) – Investor.gov. Protect Your Money: How to Avoid Investment Scams. Explains common fraud warning signs, including guaranteed returns, pressure to invest immediately and FOMO.
Read the SEC Guide to Avoiding Investment Scams - S&P Dow Jones Indices. SPIVA U.S. Year-End 2025. Provides data comparing actively managed U.S. funds with their benchmarks. The report found that 79% of active large-cap U.S. equity funds underperformed the S&P 500 in 2025.
Read the SPIVA U.S. Year-End 2025 Report - Vanguard. Four Principles for Investing Success. Discusses four core principles: establishing goals, maintaining balance and diversification, minimizing costs, and maintaining long-term discipline.
Read Vanguard’s Investing Principles - Vanguard. Four Timeless Principles for Investing Success. Explores diversification, investment costs, tax efficiency and maintaining discipline during market volatility.
Read Vanguard’s Four Timeless Principles
Disclaimer: This article is for educational and informational purposes only and should not be considered financial, investment, tax, or legal advice. Investing involves risk, including the possible loss of principal. Past performance does not guarantee future results. Investors should consider their individual financial situation, investment objectives, time horizon, and risk tolerance before making investment decisions.