Capital Group, a renowned mutual fund firm, has expanded its $1 billion investment in Bitcoin-related stocks to over $6 billion. Led by portfolio manager Mark Casey, the firm has primarily invested in Bitcoin treasury companies, which hold Bitcoin on their balance sheets. Capital Group's most significant investment is in Strategy, formerly MicroStrategy, where it holds a 7.89% stake valued at approximately $6.2 billion after a 2,200% stock surge. The firm's Bitcoin exposure also includes a 5% stake in Japan-based Metaplanet and shares in mining company Mara Holdings. Casey, influenced by investment legends Benjamin Graham and Warren Buffett, views Bitcoin as a commodity, similar to gold or oil. This strategic move aligns with a broader trend, as corporate Bitcoin treasuries now hold over 1 million BTC, valued at more than $117 billion.