Warren Buffett's Successor, Greg Abel, Has 30% of Berkshire Hathaway's $343 Billion Investment Portfolio Tied Up in 2 Foundational AI Stocks

It's a year of new beginnings for the trillion-dollar conglomerate that Warren Buffett helped build, Berkshire Hathaway (BRKA 1.02%)(BRKB 1.70%). Following the Oracle of Omaha's retirement as CEO on Dec. 31, Berkshire has its first new leader in more than half a century.

Buffett's protégé, Greg Abel, is now at the helm -- and he's wasted no time making his presence felt. Since taking over, Abel has completely exited 16 positions and amassed a mammoth stake in Google parent Alphabet (GOOGL 1.32%)(GOOG 1.35%). When combined with Berkshire's largest position, Apple (AAPL +1.00%), Abel has 30% of Berkshire's $343 billion investment portfolio tied up in two foundational artificial intelligence (AI) stocks.

Warren Buffett retired as Berkshire Hathaway's CEO on Dec. 31. Image source: The Motley Fool.

Alphabet: 9.1% of invested assets

There's no stock that Greg Abel has purchased more aggressively since taking over as CEO a little over six months ago than Alphabet.

During the first quarter, he more than doubled Berkshire's stake in Alphabet's Class A shares (GOOGL) and opened a position in its Class C shares (GOOG). More recently, Berkshire committed to buy a $10 billion private placement from Alphabet ($5 billion of each share class).

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NASDAQ: GOOGL

Alphabet

Today's Change

(-1.32%) $-4.86

Current Price

$362.17

Key Data Points

Market Cap

$4.4TMarket cap calculated using publicly traded shares outstanding only. Does not include unlisted, private, or dual-class non-traded shares. Implied market cap may vary.Market cap calculated using publicly traded shares outstanding only. Does not include unlisted, private, or dual-class non-traded shares. Implied market cap may vary.

Day's Range

$358.03 - $367.75

52wk Range

$174.38 - $408.61

Volume

796.3K

Avg Vol

31.5M

Gross Margin

60.43%

Dividend Yield

0.23%

Alphabet checks an important box for both Abel and his predecessor, Warren Buffett. Namely, it offers a sustainable moat. The Google search engine accounted for approximately 91% of global internet search traffic in June. When coupled with streaming platform YouTube, the second-most-visited site on the planet, it's easy to see how Alphabet commands such incredible ad pricing power.

But Alphabet's growth engine is powered by cloud infrastructure services platform Google Cloud and its AI integration. Since Google Cloud began offering clients access to generative AI and large language model solutions, sales growth for this high-margin segment has reaccelerated from 28% in the first quarter of 2025 to 63% in the comparable quarter ending in March 2026.

Image source: Apple.

Apple: 20.5% of invested assets

Although Warren Buffett sold 75% of Berkshire Hathaway's Apple stake over the nine quarters leading up to his retirement, the remaining stake still accounts for more than a fifth of invested assets.

When Buffett began selling a substantial number of Apple shares, he framed the decision as being tax-driven at Berkshire Hathaway's annual shareholder meeting in 2024. But in Greg Abel's first letter to shareholders, he alluded to Apple as a multidecade compounder. Despite being sold off heavily by Buffett, Apple isn't going anywhere.

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NASDAQ: AAPL

Apple

Today's Change

(1.00%) $3.10

Current Price

$313.76

Key Data Points

Market Cap

$4.6TMarket cap calculated using publicly traded shares outstanding only. Does not include unlisted, private, or dual-class non-traded shares. Implied market cap may vary.Market cap calculated using publicly traded shares outstanding only. Does not include unlisted, private, or dual-class non-traded shares. Implied market cap may vary.

Day's Range

$307.07 - $314.82

52wk Range

$201.50 - $317.40

Volume

2.2M

Avg Vol

54M

Gross Margin

47.86%

Dividend Yield

0.34%

For well over a decade, physical devices such as iPhone, Mac, and iPad have made Apple tick. However, CEO Tim Cook has charted a new course. He's transforming Apple into a platform-driven company, led by high-margin subscription services that'll keep customers loyal to the Apple ecosystem, and the integration of AI solutions.

In June 2024, at Apple's Worldwide Developers Conference, the company unveiled Apple Intelligence. Apple's generative AI tool was introduced into its physical devices in late 2024/early 2025. It aims to assist users with text summarization and substantially enhance Siri's onscreen awareness.

While Apple remains dependent on sales of its physical devices, its subscription services and AI integration are expected to improve customer loyalty and bolster the company's margins.