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Mark Cuban Says This Fund Should Form the Core of Your Portfolio

For most investors, low-cost index funds are a sensible long-term investment strategy.

By Jordan Major

Edited by Kristy DeSmit

Updated March 2, 2026

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You might expect a billionaire entrepreneur to recommend bold stock picks or aggressive strategies. Mark Cuban does the opposite.

Instead of chasing hot stocks or timing the market, he believes most investors should start with a low-cost S&P 500 fund to build long-term wealth. But that doesn't mean putting every dollar into one basket. Cuban has also explained where riskier assets belong and how to balance growth with discipline.

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Why Cuban favors an S&P 500 fund

In an interview about personal finance, the former "Shark Tank" star put it plainly:

"Saving money and putting some into a low-cost mutual fund, like an SPX fund, will pay off dividends," he said.

The S&P 500 represents 500 of the largest publicly traded companies in the United States. It spans technology, health care, financials, consumer brands, energy, and industrials. In other words, it reflects a broad slice of the U.S. economy.

Over the past year, the index has gained about 16.55%. Over five years, it has climbed over 80%. Year to date, it's slightly up at around 1.39%.

Now compare that to inflation. Over the past five years, cumulative inflation has been significantly lower than the S&P 500's 80% gain. While inflation erodes purchasing power, broad market exposure has historically outpaced it over extended periods. That gap is what drives long-term wealth creation.

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You cannot buy the index directly

The S&P 500 itself is an index, not an investment product. To gain exposure, investors use mutual funds or ETFs that track it.

One example is the Vanguard S&P 500 UCITS ETF, which mirrors the index's performance. The fund currently offers a dividend yield of about 1.2% and distributes income to shareholders, including a recent per-share dividend of approximately $29.91.

While the S&P 500 index does not directly "pay dividends," funds that track it collect dividends from underlying companies and pass them on to investors. The appeal is efficiency. These funds typically charge very low fees compared with actively managed funds, meaning more of your money stays invested and continues compounding over time.

The discipline behind Cuban's advice

Cuban's philosophy revolves around probability and simplicity.

He has suggested that consistently saving money and putting a portion into a low-cost mutual fund tied to the S&P 500 can pay off over time, especially when paired with disciplined spending habits. Living below your means, in his view, amplifies the compounding effect.

The point is not that the S&P 500 will never decline. It will. Markets experience corrections, bear markets, and periods of stagnation. The point is that over long periods, broad exposure to productive businesses has historically rewarded patient investors.

Trying to outguess the market, by contrast, often introduces unnecessary risk and emotional decision-making.

How it compares to active investing

Actively managed funds aim to outperform the S&P 500 by selecting individual stocks or timing sectors. In theory, skilled managers can add value.

In practice, many active funds struggle to beat the index consistently after accounting for fees. Higher expense ratios create a hurdle that managers must overcome before investors see any excess return.

For investors without the time or inclination to analyze financial statements and monitor macro trends, a passive S&P 500 fund removes much of that complexity. It does not promise outperformance. It promises participation.

What Mark Cuban says about speculative bets

While Cuban favors an index fund as a portfolio core, he has acknowledged that some investors may want to allocate a small portion of their portfolio to higher-risk assets.

The billionaire has said that if you truly want to take a swing for the fences, allocating around 10% to assets like Bitcoin or Ethereum could make sense, but only under one condition.

As he once put it:

"If you're a true adventurer and you really want to throw the Hail Mary, you might take 10%, put it in Bitcoin or Ethereum... but if you do that, you've gotta pretend you've already lost your money."

His message is clear. Speculative assets can exist in a portfolio, but they should not form its foundation. The core remains diversified and broad.

What else fits alongside an index fund?

Beyond index funds and speculative crypto allocations, Cuban often emphasizes something less glamorous but equally powerful: cash discipline and liquidity.

Maintaining emergency savings reduces the likelihood of being forced to sell investments during downturns. Living below your means creates surplus capital that can be invested consistently, regardless of market headlines.

He has also spoken positively about investing in yourself, whether through education, skill development, or building a business. Human capital, in many cases, generates returns that exceed financial assets.

The structure, then, becomes straightforward. A low-cost S&P 500 fund at the center. Limited speculative exposure on the edges. Cash reserves for stability. Continuous investment in personal growth.

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Bottom line

If you're building wealth for the long run, Cuban's portfolio advice is refreshingly simple. Start investing with a low-cost S&P 500 fund. It offers broad diversification, long-term growth potential, and a history of outpacing inflation. More importantly, it removes much of the complexity that trips up individual investors.

Speculative assets may have a place, but only in limited amounts and with the understanding that risk is real. Consistency applied over decades is often what turns steady contributions into meaningful financial independence.

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