Warren Buffett’s Berkshire Hathaway revealed a new stake in troubled insurer UnitedHealth last quarter, according to a regulatory filing, a surprising buy because of the company’s current reputation, but perhaps not considering his history of bargain investing.

The Omaha-based conglomerate bought more than 5 million shares in the health care firm for a stake worth about $1.6 billion at the end of June. The stake puts it as the 18th biggest position in the Berkshire portfolio behind Amazon and Constellation Brands, according to VerityData.

Berkshire’s equity portfolio is worth about $300 billion, so it is possible that Buffett’s two investing lieutenants Todd Combs and Ted Weschler were more responsible for this purchase rather than the “Oracle of Omaha” himself. Buffett said one of his investment managers was behind the Amazon investment in 2019.

The insurer’s stock shot up 6% in extended trading following Berkshire’s disclosure.

Shares of UnitedHealth were down nearly 50% for 2025 through Thursday’s close before Buffett’s filing. The largest private health insurer has become the face of a public blowback in this country against the rising costs of health care. UnitedHealth is currently facing a Justice Department investigation into its Medicare billing practices.

In May, the company pulled its annual earnings outlook and CEO Andrew Witty stepped down. Last month, UnitedHealth gave a new 2025 outlook that was well short of Wall Street estimates, hitting the stock further.

Buffett, who’s turning 95 this month, has been critical of the healthcare system in the U.S., calling it a “tapeworm” on the economy due to its high costs. In 2018, he, along with Jeff Bezos and Jamie Dimon, launched a joint venture to improve healthcare for their employees and potentially for all Americans, but it was eventually shut down.

UnitedHealth isn’t the only stock Berkshire picked up recently. In fact, the conglomerate also took small stakes in steel manufacturer Nucor, outdoor advertising company Lamar Advertising and security firm Allegion. Berkshire also got back into homebuilders Lennar and DR Horton.

Shares of Nucor jumped nearly 8% in afterhours trading, while Lennar and DR Horton popped about 3% each.

Buffett also pared his positions in Bank of America and Apple. The Apple stake was cut by about 7%. Berkshire’s largest positions as of the end of the second quarter were Apple, American Express, Bank of America, Coca-Cola and Chevron.

The legendary investor is stepping down as Berkshire CEO at the end of the year, handing over the reins to Greg Abel. Buffett will stay on as chairman of the board. It’s still unclear who will be in charge of Berkshire’s gigantic equity portfolio, though Buffett has alluded that Abel will be making all capital allocation decisions at the conglomerate.

UnitedHealth attracted other buyers last quarter, according to filings, including Michael Burry and Appaloosa Management’s David Tepper. Shares of the insurer are trading at a price-earnings ratio of just under 12, near its lowest in more than a decade.

There was speculation regarding a mystery stock Buffett was buying as Berkshire had asked for permission to keep certain holdings secret last quarter. It turns out the secret stock was a combination of multiple positions and likely the stakes added in DR Horton, Nucor and Lennar “A” shares.

Best Buy is launching a third-party marketplace, as it tries to bulk up the variety of merchandise it offers and reverse slower sales.

Starting on Tuesday, shoppers who go to Best Buy’s website and app will see products and brands that weren’t available there before, including more tech-related accessories like custom video game controllers and some nontech items including seasonal decor and sports collectibles.

The company’s online marketplace riffs off those of other retailers, such as Amazon and Walmart, by relying on third-party sellers to stock, sell and ship inventory and taking a cut of their sales in the form of a commission.

“Everything we do is really centered around the customer and their technology needs, and we do see customers actually doing a lot of consumer electronics transactions through marketplaces,” Chief Customer, Product and Fulfillment Officer Jason Bonfig said. “And as a result of that, we need to make adjustments to be where the customer’s at.”

He said Best Buy noticed gaps in its assortment that the new platform will help it fill. For instance, Bonfig said the company didn’t carry batteries for some older cameras or cases for older smartphones. And it didn’t offer some items that complement Best Buy purchases, such as furniture that goes around a big-screen TV or cookware to use with a new kitchen appliance.

Along with adding those items, the marketplace makes it possible for smaller vendors with innovative products to sell on Best Buy’s website when they’re not yet big enough to make or distribute the volume needed for its stores, he added.

Best Buy’s marketplace launches at a time when its business could use a boost. Its annual sales have declined over the past three years as the company contends with a sluggish housing market, selective consumer spending and a decline in device replacements after a spike in tech purchases during the Covid pandemic.

The company cut its sales outlook in May and said it expects full-year revenue to range from $41.1 billion to $41.9 billion. That would be similar to Best Buy’s annual revenue of $41.5 billion in the most recent fiscal year, but below the numbers it posted in the years leading up to and during the pandemic.

Best Buy will share its most recent earnings results and sales forecast on Aug. 28.

Tariffs have complicated the backdrop for Best Buy, too, since the higher duties have added costs for consumer electronics vendors and distracted them from other priorities like research and development that leads to new and innovative products, said Jonathan Matuszewski, a retail analyst at Jefferies. He said Best Buy tends to win sales instead of big-box or online competitors when there’s a leap forward in technology.

With the platform’s launch, Best Buy joins other retailers that have jumped on the trend of introducing or expanding third-party marketplaces. Lowe’s and Nordstrom started marketplaces last year. Ulta Beauty plans to launch its own later this year. And Target said it will expand its existing marketplace, Target Plus.

On Best Buy’s earnings call in May, CEO Corie Barry described the third-party marketplace as one of the company’s strategic priorities for the year. She said that new profit stream “is even more important in this environment” and will provide greater flexibility with the range of items and price points.

Plus, she said the marketplace supports the company’s growing advertising business. Sellers can buy ads for their products, including by paying for better placement in search results.

Marketplaces and the advertising opportunities that come with them tend drive higher profits for retailers, said Justin MacFarlane, a managing director for the global retail group of AlixPartners. Sellers buy, stock and ship products instead of the retailer, and take on both the expense of buying inventory and the risk that they may have to mark down unwanted items, he said.

Yet the business model comes with risks, too, he said. For instance, sellers may not have the same standards as a retailer and it could anger a retailer’s customers if they send products in torn boxes, with missing pieces or days later than expected. And he said retailers can flood their websites with so many different categories, brands and products that they overwhelm customers with choices that seem irrelevant to their company’s identity.

“You get addicted to the growth and more is more until it’s not,” he said.

At launch, Best Buy’s marketplace will have about 500 sellers, Bonfig said. He said the company vetted applicants and whittled them down to the ones who can provide a high-quality customer experience. The sellers must match Best Buy’s return policy, he added.

Customers can return purchases either directly to the seller or to Best Buy stores, he said.