

Warren Buffett's Berkshire Hathaway revealed in a Q1 13F filing that it purchased nearly 26 million shares of Chubb, valued at $6.7 billion. This investment was previously a confidential "mystery stock" that intrigued investors. Additionally, Berkshire sold off its entire stake in HP and significantly reduced its holdings in Apple and Paramount Global. Despite these sales, Apple remains one of Berkshire's largest stock holdings. Chubb's stock rose 5.5% following the news, aligning with Berkshire's focus on the insurance sector.