The Oracle of Omaha loaded up on shares of an business chief in an unlikely sector.
You won’t notice it, however Thursday, Aug. 14, was arguably crucial day of the quarter for buyers. Though earnings season can clue buyers in to the well being of Wall Road’s main companies, Form 13Fs are equally beneficial.
A 13F is a required submitting due no later than 45 calendar days following the top of 1 / 4 (Aug. 14) for institutional buyers with no less than $100 million in belongings beneath administration. It supplies buyers with a concise snapshot of which shares Wall Road’s smartest and most profitable cash managers purchased and bought within the newest quarter (on this occasion, the quarter that resulted in June).
Whereas Wall Road is full of brand-name asset managers, none garners the eye of buyers fairly like Berkshire Hathaway (BRK.A -0.26%) (BRK.B -0.35%) CEO Warren Buffett. Mirroring the aptly dubbed Oracle of Omaha’s buying and selling activity has been a time-tested technique for wealth creation.

Berkshire Hathaway CEO Warren Buffett. Picture supply: The Motley Idiot.
Though each aspect of Buffett’s buying and selling exercise tends to be put beneath the microscope by skilled and on a regular basis buyers, this quarterly 13F was distinctive. It revealed the thriller inventory that Berkshire’s billionaire boss had been buying under the guise of secrecy — and it is not what anybody on Wall Road had been anticipating.
Warren Buffett buys huge beneath the “confidential therapy” tag
On uncommon events, regulators grant outstanding cash managers the power to construct up a stake in a number of securities beneath the “confidential therapy” tag. Confidential securities do not have to be reported on a 13F, and there is a goal behind this.
When a high-profile asset supervisor like Warren Buffett opens a place in a inventory, it is not unusual for its share worth to surge as buyers pile in. Being granted confidential therapy permits these outstanding buyers (like Buffett) to construct up a place at a extra engaging value foundation.
The Oracle of Omaha has been granted the confidential treatment tag on a couple of occasions over the past decade:
- In 2015, Berkshire was afforded this exclusion to construct up a stake in vitality big Phillips 66.
- Through the early levels of the COVID-19 pandemic, the confidential therapy tag was utilized by Buffett and his crew to create multibillion-dollar positions in Verizon Communications and Chevron, the latter of which stays a core holding.
- Within the second half of 2023 and throughout the first quarter of 2024, this particular tag was used to pile into property & casualty insurer Chubb.
- It was additionally granted throughout the first half of 2025 for a thriller inventory that is now been revealed following Berkshire’s second-quarter 13F submitting.
Although there are literally thousands of publicly traded firms, Berkshire Hathaway’s quarterly working outcomes have provided huge clues as to the place this thriller inventory resides. Each quarter, Buffett’s firm supplies a price foundation breakdown of the securities held in its funding portfolio from three classes:
- Banks, insurance coverage and finance
- Client merchandise
- Business, industrial and different
The cost bases for the first two segments have been declining, whereas business, industrial and different has been climbing. In different phrases, it was fairly clear that Buffett’s thriller purchase wasn’t a financial stock or shopper staples firm.
We additionally know that, traditionally talking, Berkshire’s billionaire chief tends to keep away from the tech and healthcare sectors. Buffett is not probably the most tech-savvy, and maintaining on clinical-trial knowledge is not excessive on his listing of issues to do. All signs were pointing to an industrial stock being his big purchase throughout the first half of 2025…however Wall Road was means off!

Picture supply: Getty Pictures.
The Oracle of Omaha lifts the curtain on his thriller inventory
Regardless that Berkshire’s boss has been a persistent net seller of stocks for 11 consecutive quarters, to the tune of $177.4 billion, he did fairly a bit of shopping for throughout the quarter ending in June. Berkshire’s 13F exhibits six new positions have been opened, with a half-dozen current holdings being added to.
Nonetheless, the one new buy that is sure to lift eyebrows and drop jaws is the reveal of the thriller inventory: UnitedHealth Group (UNH 12.04%). Buffett oversaw the acquisition of 5,039,564 shares of UnitedHealth, value near $1.6 billion on the finish of June.
There’s not a sector Warren Buffett understands higher or feels extra snug investing in than financials. Whereas banks and credit score service suppliers could be the primary that come to thoughts when listening to the phrase “financials,” it additionally contains an assortment of insurance coverage firms, resembling Chubb.
A considerable portion of UnitedHealth’s enterprise includes medical health insurance. Although UnitedHealth is not defending property, the premise of insurance coverage firms is comparable throughout the board. They gather premiums and outlay capital to cowl member claims, with the expectation being that premiums collected will far outweigh the quantity spent on its members.
Sometimes, insurers possess exceptional pricing power. Since catastrophes and better declare durations are inevitable, insurers are sometimes justified in elevating their premiums on a near-annual foundation. When insurers aren’t outlaying their collected premium to cowl claims, it is invested in secure, interest-bearing belongings to bolster income.
However UnitedHealth Group is more than just a leading health insurance company. Its healthcare companies section, Optum, has been a faster-growing and higher-margin counterpart for fairly a while. Optum supplies healthcare firms with all the things from care supply and pharmacy care companies to the software program they use.
Warren Buffett’s modus operandi is to attend for worth dislocations to current themselves. In a historically pricey stock market, finding worth has been nearly not possible. But, with UnitedHealth Group inventory dropping greater than half its worth for the reason that midpoint of April, a uncommon worth dislocation has emerged.
Nonetheless, UnitedHealth inventory did not dive 54% on a whim. Its poor efficiency is a mirrored image of upper prices related to the corporate’s Medicare Benefit section (also referred to as Medicare Half C). Whereas lots of UnitedHealth’s friends anticipated increased bills on this personal Medicare section in 2025, UnitedHealth didn’t and is now paying the worth.
The excellent news is that UnitedHealth Group has endured difficult environments like this earlier than, they usually not often final for any vital size of time. The corporate ought to have the ability to handle premiums for the upcoming yr and work to decrease its prices.
UnitedHealth Group’s forward price-to-earnings (P/E) ratio of 14 (previous to Buffett revealing it as his thriller inventory) represents a 26% low cost to its common forward-year earnings a number of over the trailing-five-year interval. It is also an organization with a sturdy capital-return program, highlighted by a rising dividend and hearty share buybacks.
Although a healthcare stock might be the very last thing Wall Road was anticipating, UnitedHealth Group checks all the best packing containers for the value-oriented Oracle of Omaha.