Berkshire Hathaway Inc. Class B

Money comes from several distinct pricing mechanisms rather than one: premiums for taking on insurance and reinsurance risk, regulated tariffs for electricity and gas delivered to utility customers, contract-based charges for freight that vary with the product and route, sales and service revenue from manufactured and retailed goods, leasing revenue, and returns on capital held between collecting premiums and paying claims.

It scales less by growing one existing business bigger and more by adding entire additional businesses, bought outright and funded in part by cash its insurance operations hold between collecting premiums and paying claims, with each acquired business kept running under its own management while capital-deployment decisions are made centrally. Its size places it among the largest companies by market value, though its recorded earnings have not moved in a smooth line, including at least one loss-making year in the past several years despite its most recent run of years on file being profitable throughout.

Its manufacturing subsidiaries depend on physical inputs sourced from outside the group, including specialty metals drawn from a small number of world regions, petrochemical feedstocks, timber products, agricultural fiber and base metals, some bought from a single supplier and held in place by long-term contracts, and on outside contract manufacturers for some consumer-goods production. One wholesale distribution business depends on a small number of large retail and restaurant customers for much of its revenue, and the group as a whole names dependence on a small number of people who make its capital-allocation decisions and on qualified operating personnel.

Households, businesses and government bodies that buy electricity and gas depend on its utility subsidiaries for delivery under regulated arrangements, shippers depend on its rail network to move freight, and policyholders and other insurers and reinsurers, including a specific multi-year reinsurance relationship with an Australian insurer, depend on its insurance subsidiaries to take on risk backed by unusually high capital strength and top financial-strength ratings. A further set of customers are already committed under agreements running more than a year forward for energy and other contracted services, so they currently rely on continued delivery.

The way it funds itself, using cash held between collecting insurance premiums and paying claims as investable capital, is shared with a specific but limited group of other companies that CompanyGraph classifies the same way, making it an established but minority approach rather than a unique one. Its own account separately describes pairing that funding approach with a decentralized structure holding a wide range of unrelated, wholly owned businesses under one central capital allocator, a combination the available data does not benchmark against other companies.

A meaningful part of its revenue is already committed under contracts extending more than a year into the future, covering both energy delivery and other sales and service arrangements, so those customers are bound to the agreed term rather than free to leave at will. Some of its revenue also comes from utility service billed under regulated tariffs rather than competitive pricing, a setting where customers typically deal with a single provider for their service territory, though the company's own filings stop short of stating that customers have no alternative.

In its own account, the company ties future growth in at least one manufacturing business to expanding physical production capacity fast enough to meet demand, and names reduced availability of certain raw materials and difficulty recruiting, training and retaining qualified staff as general limits on growth. It also lists dependence on a small number of people who make its capital-allocation decisions among the risks it names first, meaning the function that decides where capital moves across the group rests on very few individuals.

Its own filings name several vulnerabilities before others: terrorist acts, cybersecurity incidents, geopolitical events, losing a small number of key people, difficulty finding qualified staff, and holding equity investments concentrated in a small number of positions rather than spread broadly. They also disclose that one wholesale distribution business depends on a small number of large customers for much of its revenue, that certain manufacturing subsidiaries rely on a single supplier for some materials, a risk the company says is softened by long-term contracts, that one utility subsidiary carries wildfire-related legal demands large enough to be called out on their own, and that most of its revenue is generated within the United States.

Because its subsidiaries operate in different regulated industries, it answers to many separate regulators at once, including state insurance regulators, federal rail and transportation authorities, and federal and state energy regulators, each able to constrain a different part of the group. It also names specific pressures in its own account: wildfire-related legal claims at one utility subsidiary, antitrust litigation over commission-setting at a real-estate services subsidiary, geopolitical events, sanctions and trade tariffs, and currency exposure from operations and borrowing outside the United States.