Warren Buffett's Apple bet is worth nearly $180 billion - and it's made Berkshire Hathaway stock a bargain, analyst says

• Warren Buffett's Apple bet has ballooned in value to nearly $180 billion.
• Apple stock has jumped almost 50% this year, as AI buzz has fueled a Big Tech rally.
• Berkshire Hathaway is now 15% undervalued, partly due to its Apple gains, one analyst says.

Warren Buffett's slice of Apple is looking juicier than ever, following a nearly 50% surge in the technology titan's stock price this year.