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Kevin O'Leary Says These 5 Investing Rules Could Make or Break Your Portfolio

Discover Kevin O'Leary's rules of investment and how to apply them.

By Josh Koebert , Edited by Laura Hohenstein

Updated Sept. 28, 2026

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Not satisfied with where you stand financially? It might be time to explore Kevin O'Leary's recipe for success. Kevin O'Leary, popularly known as Mr. Wonderful from his appearance on Shark Tank, is a renowned investor who has gradually built his wealth through investing. And he's always open to sharing what he has learned over the years.

The billionaire highlighted his top five investment rules in a LinkedIn post in August. This article takes an in-depth look at these rules, breaking them down to help you save better for retirement and minimize your risk of costly mistakes.

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Protect your liquidity

One of the biggest misconceptions people have about building wealth for retirement is that they have to invest every dollar. However, O'Leary warns about this, encouraging everyday investors to stay liquid. Liquidity means keeping cash at hand or in readily accessible assets so you don't have to sell off your investments every time you need money.

Don't get us wrong: this doesn't mean you shouldn't put your money to work. O'Leary encourages balancing investments with liquidity. If you're still working, maintaining liquidity could mean putting several months' worth of expenses in cash vehicles such as high-yield savings accounts (HYSAs) and money markets, and then investing the rest.

Doing so could allow you to meet emergency financial needs without liquidating your investments. Keeping a cash reserve may also enable you to invest in attractive opportunities as they arise.

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How much should you reserve?

The exact amount to reserve depends on various factors, including:

Age: The closer you are to retirement, the more money you need in your cash reserve. The money could help you cover living expenses when you retire.
Expenses: The higher your expenses, the more liquid you need to be to cover your needs in case of emergencies.
Income stability: If you have a stable source of income, such as a tenured job, you could afford to be a little less liquid than people whose income varies.

Don't let one investment dominate your portfolio

In an appearance on the Iced Coffee Hour podcast, O'Leary broke down his portfolio, saying it comprises equities, fixed-income assets, and alternatives such as collectibles. He also revealed his personal rule: not investing more than 20% in any one sector and 5% in any one company.

Diversification exposes you to multiple assets, which could reduce your risk. Suppose you have a $100,000 portfolio and put $60,000 in a single stock. If the stock falls by 30%, you could lose $18,000 (18% of your portfolio). Conversely, if you invest 5% of your portfolio ($5,000) in the same stock and it falls by the same percentage, you stand to lose $1,500, or 1.5% of your portfolio.

If you're new to investing, consider buying into a broad-market index fund instead of making individual stock picks. An index fund provides exposure to multiple assets and investments, essentially spreading your risk.

Buy investments that pay you

O'Leary credits this rule to his mother. According to Mr. Wonderful, his mother invested in Telco bonds and big stocks in the S&P 500, and used the interest and dividends to support her family.

His advice for everyday investors is to buy investments that generate cash flow instead of relying solely on the hope that they'll become more valuable in the future. For example, you could buy dividend-paying stocks, interest-bearing bonds, or even rent-accumulating real estate. Such assets could provide income to help you cover your expenses.

That doesn't mean that your portfolio should consist entirely of investments that generate regular income. O'Leary himself has multiple assets that don't, such as his collectibles.

A good rule of thumb is to consider your age and current circumstances. If you're decades away from retirement and have no need to withdraw income from your portfolio, maybe because you have a stable source of income, long-term growth assets could be reasonable. However, if you're near retirement and need a regular cash flow to support yourself, cash-generating assets might be better suited.

Protect your principal

This is yet another rule based on O'Leary's mother's investment strategy. According to O'Leary, his mother lived off the cash flow from her investments, never touching her principal. That's why he encourages investors to prioritize income-generating assets in their portfolios. If you have a $500,000 portfolio that generates $25,000 in income annually, O'Leary's advice is to live on that $25,000 rather than sell part of your portfolio to fund your lifestyle.

Mr. Wonderful's wealth-preservation philosophy, however, might not be ideal for all investors. Selling your investments might be a good idea if:

Your retirement income isn't enough to sustain your lifestyle.
You need to rebalance your portfolio to bring assets to your preferred allocation percentages.
An investment no longer aligns with your financial goals and risk-exposure preferences.

Control your debt

O'Leary isn't 100% against debt. However, he warns against taking on too much or overly expensive debt, as it can erode your returns. For example, if you have a $100,000 credit card debt charging 20% interest, and a $100,000 portfolio generating 22% returns, your net income would only be 2%.

What's more, you'd need to make sure your investment generates more than 20% before taxes and fees to offset that interest expense — which is virtually impossible given market unpredictability.

If you want to get ahead financially, try to reduce your debt. Prioritize expensive options such as high-interest credit cards and personal loans.

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Bottom line

Kevin O'Leary's five investment rules are especially great if you want to start investing. They don't require you to know how to pick stock winners or time the market. Instead, they call for you to reduce your risk exposure and take a long-term investing stance, which is possible regardless of your expertise.

It's worth noting, however, that O'Leary's rules don't apply to all investors. Consider your personal circumstances, financial goals, risk preference, and age when determining how to invest.

This article is for informational purposes only and should not be considered investment advice.

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