Mark Cuban Warns Warren Buffett's Berkshire Hathaway About This Investment

Warren Buffett is arguably the greatest investor of all time. Recently, the Nebraska native who has been nicknamed the "Oracle of Omaha" stepped down from his job as CEO of Berkshire Hathaway, although he remains chairman of the conglomerate.

As a new era dawns for Berkshire, billionaire Mark Cuban has some advice for the company and other investors. Are Cuban's words of wisdom worth considering if you are trying to boost your own financial fitness?

Mark Cuban takes aim at health insurance companies

In a post on X, Cuban urged investors to think twice about investing in insurance companies.

The billionaire and "Shark Tank" star questioned the practices of big insurers, saying they push risk on physicians, pharmacists, and patients who operate independently.

On X, Cuban wrote: "The big insurance companies and their subsidiaries get revenue and cost certainty from the government and push the risk to the independent physicians, pharmacists and patients."

A warning against health insurance investments

Cuban then underscored that these smaller fish cannot fight back against the whales of the insurance industry.

Cuban urged people to reconsider their investments in the insurance industry: "Next step is to identify the funds who have invested in the biggest insurance companies and to move your IRAs and savings elsewhere."

Cuban offers some advice to Berkshire Hathaway

Cuban also tweeted some unsolicited advice to Berkshire Hathaway.

In the tweet, Cuban wrote: "I hate to say this because I love Warren Buffett (I know he retired), but Berkshire Hathaway needs to reconsider their healthcare insurance investments."

In the past, Buffett has talked extensively about how much he loves being a part of the insurance industry.

Buffett's ties to the industry

In fact, Buffett has said that insurance company "float" — which is the money an insurance company keeps from premiums until it is paid out in claims — has been a huge factor in Berkshire's success.

In August 2025, it was revealed that Berkshire had purchased 5 million shares in UnitedHealth Group.

Berkshire also owns a number of insurance companies, including GEICO, National Indemnity Company, MedPro Group, and others.

Unpacking Cuban's argument

In a somewhat crude passage in his tweet, Cuban suggested that while the Department of Justice might not have the courage to investigate insurer practices, the market itself could make these companies divest "if the stock price [sic] of the insurance companies collapse."

This is not the first time Cuban has railed against insurance company practices. Last summer, Cuban labeled the practice of rising health insurance deductibles a "scam."

In a post on X, he wrote: "The real health insurance scam is that they know as their deductibles go up, fewer people can afford to use their insurance. Which means they don't have insurance. Despite having to pay premiums."

More recently, he argued in a panel discussion that big insurance companies should be broken up. "Those big insurance companies are too big to care," he said earlier this month at the Slopes Summit in Salt Lake City.

Cuban's own connections to the industry

It is important to note that Cuban is not an impartial observer of the health insurance industry or rising costs tied to medical care. In 2022, he co-founded Cost Plus Drugs, which has the goal of eliminating the middlemen in an attempt to lower the price of prescription drugs.

The company is considered to be a public benefit corporation, which is a for-profit entity that tries to make a positive difference in society.

What this all means for investors

Cuban is no stranger to controversy. Whatever the merits of his argument, no one should make investment decisions based on a tweet.

Rather than blindly following Cuban's lead, investors would be better advised to talk with a financial advisor or other money pro about the best way to invest for the long term.

Buffett advocates for index funds

Buffett himself has repeatedly urged everyday investors to ignore the noise of the news cycle and to skip trying to predict the future of individual companies or specific industries.

Instead, he urges people to simply invest money in a Standard & Poor's 500 Index fund.

More than 30 years ago, Buffett said, "By periodically investing in an index fund, for example, the know-nothing investor can actually out-perform most investment professionals. Paradoxically, when 'dumb' money acknowledges its limitations, it ceases to be dumb."

Bottom line

If you plan to start investing soon, don't turn to tweets by Cuban or anyone else when deciding where to put your money. Even if you believe Cuban's criticisms are valid, it doesn't mean you necessarily should follow his suggestions.

Instead, take the time to read about investing and consider sitting down with a financial advisor who can offer professional guidance on the types of investments that are right for you.

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