Why does Buffett's Berkshire Hathaway have two stocks, BRK.A and BRK.B?

Berkshire Hathaway's dual-class share structure, comprising the high-priced Class A (BRK.A) and the more accessible Class B (BRK.B), is a deliberate corporate design serving distinct strategic and philosophical purposes. The primary and original reason for the creation of the Class B shares in 1996 was to curb the proliferation of expensive, high-fee unit investment trusts that were being marketed to small investors seeking exposure to Berkshire's performance. These trusts were buying Class A shares and selling fractional interests at a significant markup, a practice Warren Buffett viewed as exploitative. By introducing a lower-priced, more liquid alternative directly from the company, Berkshire effectively undermined these third-party products, ensuring that individual investors could acquire shares without excessive intermediation costs. This move was fundamentally protective of Berkshire's shareholder base and aligned with Buffett's long-standing aversion to unnecessary financial engineering and fees.

The structural relationship between the two classes is mathematically precise and deliberately immutable. Each Class A share is convertible into 1,500 Class B shares at the holder's discretion, but the reverse is not true, cementing the A shares' senior status. This conversion right ensures that the two share classes trade in a tight economic parity, as arbitrage would correct any significant deviation. While both classes hold identical economic rights to Berkshire's earnings and assets, their voting rights differ: each A share carries one vote, whereas each B share possesses 1/10,000th of a vote. This design preserves the concentrated voting power within the Class A shares, which are predominantly held by long-term investors like Buffett himself, thereby insulating management from short-term activist pressures. The stratospheric price of a single A share—often exceeding half a million dollars—was never split and acts as a symbolic filter, attracting a specific type of committed, long-term shareholder less prone to trading.

The implications of this structure are multifaceted. Operationally, the B shares provide essential liquidity and broaden the company's investor base, allowing for inclusion in index funds and enabling share-based acquisitions without excessive dilution of voting control. Philosophically, it reflects Buffett's and Vice Chairman Charlie Munger's nuanced approach to capital allocation and corporate governance. They rejected a traditional stock split for the A shares to discourage a speculative, transactional mindset, yet they pragmatically created the B shares to serve democratizing access on their own terms. The 2010 50-for-1 split of the B shares, executed solely to facilitate Berkshire's acquisition of Burlington Northern Santa Fe, further demonstrated this utilitarian flexibility; the split made the shares accessible enough for even small Burlington shareholders to take stock rather than cash.

Ultimately, the two-class system is a bespoke solution that balances seemingly contradictory objectives: maintaining a stable, aligned ownership core while providing public market access, all without ceding control or encouraging market frivolity. It is a direct manifestation of Berkshire's unique culture, where capital stewardship is paramount and corporate actions are taken with surgical intent. The structure has proven durable, serving both the company's strategic needs and its philosophical tenets, making it a case study in tailored equity design rather than a mere concession to market convention.