Berkshire Hathaway Inc.

Background

Berkshire Hathaway began as a textile manufacturer before Warren Buffett took control in 1965 and methodically reoriented it into a holding company spanning insurance, railroads, utilities, and a publicly disclosed equity portfolio tracked closely by investors worldwide. The equity portfolio — reported quarterly via 13F filing — has become one of the most studied disclosures in US markets. Berkshire's approach is straightforward to describe and difficult to replicate: buy well-understood businesses at prices that leave a margin of safety, hold for years or decades, and avoid speculative positions. The curator note captures it plainly — "The original. Buffett + Munger discipline." With over 284 disclosed holdings and a track record spanning six decades, Berkshire occupies a category of its own among mega-managers.

Current Portfolio Signal

Berkshire's top 15 holdings account for the overwhelming majority of disclosed equity value, and the concentration is striking. Apple (AAPL) alone sits at 22.0% of the portfolio — a position size that would raise flags at most institutional committees yet has been held deliberately for years. American Express (AXP) at 17.4% and Coca-Cola (KO) at 11.6% together add another 29%, meaning three positions represent more than half the book. This is not…