Berkshire Hathaway took a $4.93 billion stake in Alphabet, sending the Google parent's shares up 5.2% Monday. The conglomerate owned 17.85 million shares as of September 30, according to a Friday filing.
The purchase marks a rare tech bet by Berkshire amid growing concerns over AI spending as tech giants pour hundreds of billions into data centers and chips.
It's unclear whether Warren Buffett, portfolio managers Todd Combs and Ted Weschler, or successor Greg Abel made the purchase. Buffett typically oversees larger investments.
At Berkshire's 2019 annual meeting, Buffett and late Vice Chairman Charlie Munger lamented not investing in Google sooner.
"We screwed up," Munger said at the time.
The new stake suggests Berkshire is finally acting on that missed opportunity, though it comes as Buffett prepares to step down as CEO at year-end after a 60-year run. Greg Abel will succeed him.
Alphabet offers more modest pricing compared to AI peers. The stock trades at 25 times expected earnings over the next 12 months, versus 30 for Nvidia and 29 for Microsoft.
That relative value may have attracted Berkshire as the conglomerate balances caution with opportunism, deploying capital selectively in companies it views as resilient.
Alphabet shares have gained 46% this year, handily outperforming the S&P 500.
Berkshire reduced its Apple stake again, though the iPhone maker remains its largest holding at $64.9 billion after the cut. Buffett has long argued Apple is a consumer products company rather than a pure tech bet.
The conglomerate also trimmed Bank of America, the latest move in a drawdown that began last year.
Berkshire has let its cash climb to a record, unsettling investors who view the company as a US economy bellwether. Some worry the hoard signals Buffett sees valuations as too high.
The Alphabet investment suggests Berkshire is finding selective opportunities despite elevated market levels. Still, the equity portfolio remains heavily tilted toward financial services at 36.6% of holdings as of September.
Berkshire's $4.9 billion Alphabet stake marks a rare tech bet under Buffett's leadership as he prepares to step down, with the Google parent's cheaper valuation relative to AI peers making it an attractive selective play despite the conglomerate's record cash pile. Whether this signals Buffett finally correcting the 2019 "we screwed up" Google regret or represents new leadership's direction remains unclear.