The Template Series | Berkshire Hathaway —The Reserve Beneath Concentration

The Template Series examines how the world’s most consequential pools of capital are actually built. Each issue takes a single institution — a conglomerate, a sovereign fund, a family holding company, a venture firm — and reads its portfolio from the inside: what it owns, how the pieces fit together, and the one principle of construction that makes the whole thing work.

The aim is not to track performance or chase tips, but to understand architecture — why a firm concentrates or diversifies, how it engineers permanence, where its structure gives it an edge and where that same structure sets a hard limit.

Taken together, the issues map a spectrum, from the maximal conviction of a five-name book to the maximal breadth of owning almost every listed company on earth, with most real portfolios sitting somewhere in between.

Berkshire Hathaway is the most closely studied portfolio in modern investing, and the reason is structural more than it is a matter of stock selection. The firm runs three layers at once: an operating engine of insurance float and wholly-owned businesses that funds everything; a concentrated public-equity book that compounds; and a Treasury-bill reserve that steadies the whole. This opening issue reads the machine as it actually stood at the close of the first quarter of 2026, isolates the principle beneath the holdings, and draws out what the structure can — and cannot — teach an ordinary investor.

The Takeaway — A reserve large enough to sit beneath the equity book is what earns the right to concentrate above it — and permanent, patient capital, not conviction alone, is what lets the concentration hold.