Apple's stock has been on a remarkable trajectory, surging by 22% in the past quarter. This impressive performance, coupled with recent filings, has unveiled a potential battle for the prestigious title of Apple's biggest shareholder. The stakes are high, with CEO Tim Cook holding a significant stake worth over $690 million, and the outcome of this battle could significantly impact the company's future.

Currently, Apple's chairman, Arthur Levinson, holds the most individual shares with over 4.59 million, putting him ahead of Cook, who owns 3.28 million shares.

When it comes to institutional investors, Berkshire Hathaway, under the leadership of the celebrated Warren Buffett, held a staggering 915.6 million shares at the start of the year. Despite selling 116 million shares, Berkshire still retains around 790 million shares. However, the mystery deepens as Berkshire's filings do not disclose individual holdings, sparking speculation about Buffett's personal ownership. With Buffett owning 38.4% of Berkshire, there's potential for significant indirect ownership of Apple through Berkshire, but the exact figure remains a tantalizing mystery.

Although Levinson currently holds the most individual shares, the combined might of Berkshire Hathaway and potentially Buffett himself makes them strong contenders for the title of Apple's biggest shareholder. Future disclosures, expected to be made in the next quarter, will reveal the true champion of Cupertino.