Berkshire Hathaway has been reducing its stake in Apple and recently bought Alphabet stock for the first time, making it the largest position in their equity portfolio. Apple will use Alphabet’s language model to improve Siri, while Berkshire sold almost 41.8 million shares of Apple, amounting to sales of around $9.4 billion.

Berkshire loaded up on $4.3 billion worth of Alphabet stock, a possible signal of confidence in Apple. Despite selling part of their Apple stake, Warren Buffett remains positive about the tech company and praises its leader, Tim Cook. Apple’s valuation is high, but Buffett’s investment in Alphabet may be a way of supporting Apple’s future.

Apple has agreed to pay Alphabet $1 billion annually to use its language model for Siri, strengthening the voice assistant’s capabilities. Apple’s recent success in iPhone sales, particularly in China, is driving growth. Buffett’s investment in Alphabet may signal confidence in both Alphabet and Apple’s futures.

Read more at Nasdaq: Is This the Undiscussed Reason Buffett Just Bought Alphabet (Google) Stock?