Alphabet Inc. (GOOG) stock just hit fresh all-time highs this week, and Warren Buffett is watching his bet get bigger by the day. The billionaire investor's Berkshire Hathaway Inc. (BRK.B) conglomerate revealed a significant stake in Google's parent company during the second quarter, and it's already banking serious returns.

A Rare Tech Play for the Oracle of Omaha

When Buffett and his investment team unveiled their Alphabet (GOOGL) position in the second quarter, it raised eyebrows. Berkshire hasn't exactly been known for loading up on Magnificent Seven stocks, so this move felt notable from the start.

The numbers tell the story. Berkshire bought 17,846,142 shares of Alphabet Class A stock in Q2, making it the fund's 10th-largest position by quarter's end. The stake represented 1.6% of the entire investment portfolio. With Alphabet shares closing at $243.10 on September 30, Berkshire's position was worth $4,338,397,120.20 at the end of the second quarter.

Then things got interesting. After Buffett disclosed the stake, Alphabet shares surged to new all-time highs of $293.95 on the first full trading day. The momentum didn't stop there. By Monday, November 25, the stock had climbed even higher, touching $328.83.

At the current trading price of $318.95, Berkshire's Alphabet stake is now worth $5,692,026,990.90. That's an unrealized gain of $1,353,629,870.70 since the end of Q2, representing a 31.2% increase. Not bad for a few months' work.

We don't know exactly when Buffett bought these shares or what price he paid, but the position has clearly appreciated significantly since the second quarter ended.

Playing Catch-Up With the Market

As 2025 enters its final stretch, Berkshire Hathaway finds itself in an unusual position: trailing the broader market. Berkshire stock is up 13.3% year-to-date, while the SPDR S&P 500 ETF Trust (SPY) has gained 16.5% over the same period.

That said, Berkshire has beaten the S&P 500 in 11 of the past 20 years, including two of the last three. This year might not be one of those winning years, but the gap is closing.

Berkshire's largest holding remains Apple Inc. (AAPL), which accounts for roughly 23% of the investment portfolio. Apple shares are up 14.5% year-to-date in 2025, also trailing the S&P 500. But like Alphabet, Apple has been hitting new all-time highs recently, which helps.

The late-year surge in both Alphabet and Apple, along with other Berkshire holdings, is helping the conglomerate narrow the performance gap with the S&P 500. Alphabet in particular has been a standout performer, up 68.3% year-to-date and ranking among the top-performing large-cap stocks in 2025. Sure, Berkshire missed out on most of those earlier gains, but the position could still prove to be a strong pick going forward.

A Glimpse Into Berkshire's Tech-Forward Future

Here's where things get even more intriguing. Buffett is set to step down as CEO of Berkshire Hathaway at the end of this year. That transition could mean the firm's portfolio takes on a more tech-heavy composition in the years ahead.

Berkshire has already been shifting in that direction. After years of avoiding the technology sector, the conglomerate now owns stakes in Apple, Amazon.com, and Alphabet. That's three of the Magnificent Seven right there, a significant evolution for a firm once known for steering clear of tech.

The Alphabet investment could represent a bet on the future of artificial intelligence. Meanwhile, Berkshire reduced its Apple stake in the third quarter, which could signal either continued selling to manage position size or a preference for Alphabet's growth prospects over Apple's moving forward.

Either way, Buffett's big bet on Alphabet is already paying off handsomely. Whether this marks a lasting shift in Berkshire's investment philosophy or simply a well-timed trade, the $1.3 billion gain in just a few months speaks for itself.