Warren Buffett made a surprisingly rare move in the third quarter, opening a new position in Alphabet Inc. (GOOGL) while continuing to pare back his historically massive Apple Inc. (AAPL) stake. The latest 13F filing from Berkshire Hathaway Inc. (BRK.B) reveals a relatively quiet quarter for the legendary investor, with just one new position and a handful of adjustments to existing holdings.

Welcome to the Club, Alphabet

The standout move in Berkshire's Q3 portfolio was the addition of Alphabet, with the conglomerate purchasing 17,846,142 Class A shares. This marks the first time Buffett has taken a position in another Magnificent Seven member beyond Apple, and the timing is notable given the tech giant's ongoing antitrust battles and competitive pressures in artificial intelligence.

The position immediately became a top-10 holding for Berkshire, representing 1.6% of the disclosed equity portfolio as of September 30. It's a meaningful but measured bet, consistent with Buffett's tendency to wade into new positions gradually rather than dive in headfirst.

The Apple Selloff Continues

If you've been following Berkshire's moves over the past year, the continued reduction in Apple shares won't surprise you. The conglomerate trimmed its position by another 15% in the third quarter, bringing total holdings down to 238,212,764 shares. Despite the steady selling, Apple remains far and away Berkshire's largest holding, accounting for 23% of the portfolio.

The question everyone keeps asking: why is Buffett selling his favorite stock? The Oracle of Omaha hasn't provided detailed commentary, but the most likely explanations involve portfolio concentration risk, valuation concerns, or simply locking in gains on one of the most successful investments in Berkshire's history. Even after multiple quarters of trimming, Apple still represents nearly a quarter of Berkshire's disclosed equity holdings.

One and Done: DR Horton Exit

In a move that raises eyebrows, Berkshire completely exited its position in DR Horton Inc. (DHI) in the third quarter. The homebuilder stock had been a new addition just one quarter earlier, making this one of the quickest entrances and exits in recent Berkshire history. The rapid reversal suggests either a quick reassessment of the housing market outlook or perhaps the position was initiated by one of Buffett's portfolio managers rather than the man himself.

Adding to Favorites

While Berkshire was trimming some positions, it was adding to others. The biggest percentage increase came in Chubb Limited (CB), which saw a 16% boost and now represents 3.3% of the portfolio. Domino's Pizza (DPZ) got a 13% bump, continuing Berkshire's multi-quarter accumulation of the pizza delivery chain.

SiriusXM Holdings (SIRI) received a 4% increase, while Lamar Advertising Holdings (LAMR) got a 3% boost. Lamar had been a new position in the second quarter, and the continued buying suggests conviction in the outdoor advertising business.

Notable Reductions

Beyond the Apple trim, Berkshire made several other cuts. The largest percentage reduction came in VeriSign Inc. (VRSN), which was slashed by 32%. Bank of America Corporation (BAC) was reduced by 6%, though it remains Berkshire's third-largest holding at 11% of the portfolio.

Smaller reductions hit DaVita Inc. (DVA) at 5% and Nucor Corporation (NUE) at 3%, suggesting Buffett is fine-tuning positions rather than making dramatic portfolio overhauls.

The Usual Suspects at the Top

Berkshire's portfolio remains heavily concentrated in a handful of longtime holdings. Here's how the top positions stack up as of September 30:

Apple (AAPL) continues to dominate at 23%, followed by American Express (AXP) at 19%. Bank of America (BAC) holds 11%, while Coca-Cola Company (KO) represents 9% of the portfolio. Chevron (CVX) accounts for 7.1%, and Occidental Petroleum (OXY) sits at 4.6%.

Rounding out the top ten are Moody's Corporation (MCO) at 4.4%, Chubb (CB) at 3.3%, Kraft Heinz Company (KHC) at 3.2%, and the newly added Alphabet (GOOGL) at 1.6%.

What It All Means

The third quarter filing shows a Warren Buffett in cautious mode, making incremental adjustments rather than bold new bets. The Alphabet addition is intriguing given Buffett's historical reluctance to invest heavily in technology stocks he doesn't fully understand. Whether this represents a new willingness to embrace big tech or simply confidence in Alphabet's mature business model remains to be seen.

What's clear is that Berkshire continues to operate with its trademark patience and concentration. The top five holdings account for roughly 69% of the disclosed equity portfolio, reflecting Buffett's long-held belief that diversification is protection against ignorance. When you know what you're doing, he'd argue, concentration makes sense.

As always, it's worth noting that 13F filings only capture a snapshot of long equity positions and don't reflect Berkshire's massive operating businesses, cash holdings, or any short positions or derivatives. But for those watching the Oracle of Omaha's every move, this quarter offered one clear takeaway: even at 94 years old, Warren Buffett is still willing to make new bets.