Conglomerates are companies that own controlling interests in a diverse range of businesses across different industries. Unlike focused sector companies, conglomerates derive their value from capital allocation — the ability of a central management team to allocate capital to the highest-return opportunities across their portfolio, and to buy entire businesses at attractive prices.
The pure conglomerate has largely fallen out of fashion in modern markets — investors can build their own diversified portfolios, and the “conglomerate discount” (markets value diversified companies below the sum of their parts) discourages the structure. But Berkshire Hathaway, under Warren Buffett, is the celebrated exception: a conglomerate that has compounded book value at ~20% annually for over 50 years, creating more total wealth for shareholders than any other company in history.
Conglomerate Business Models
Wholly-Owned Operating Subsidiaries
The core of a traditional conglomerate: own 100% of operating businesses across multiple industries. Berkshire Hathaway owns BNSF Railway, Berkshire Hathaway Energy, Geico Insurance, McLane Company, and dozens of manufacturing and retail businesses including Duracell, Fruit of the Loom, See’s Candies, and Precision Castparts.
These subsidiaries operate with significant autonomy — Berkshire’s headquarters in Omaha has fewer than 30 employees. Cash flows from subsidiaries are remitted to the parent for reallocation.
Equity Investment Portfolio
Berkshire also holds a massive portfolio of publicly traded equities: Apple (largest position), Coca-Cola, American Express, Bank of America, Chevron, and others. This portfolio — valued at $300B+ — effectively functions as a permanent holding company stake in the most durable businesses in America.
The insurance float (premiums collected minus claims paid) from Geico and other Berkshire insurance subsidiaries provides low-cost or near-free capital that Berkshire can invest in equities and acquisitions. This “free float” is one of the most valuable structural advantages in finance.
Insurance Float as Investment Capital
Geico, General Re, Berkshire Hathaway Reinsurance, and BHRG generate insurance premiums that sit as “float” — Berkshire holds this money until claims are paid. In a year when premiums exceed claims (an underwriting profit), the float is effectively negative-cost capital. Berkshire has used this structural advantage to invest in equities and acquire businesses, turbocharging returns for decades.
Revenue Models Compared
| Subsidiary Type | Revenue Basis | Pre-tax Margin |
|---|---|---|
| Insurance (Geico, Gen Re) | Premiums written | 3–12% underwriting (variable) |
| Railroad (BNSF) | Revenue per carload × carloads | 30–35% |
| Energy (BHE) | Regulated utility + generation | 15–25% |
| Manufacturing/retail | Various | 10–20% |
| Equity portfolio | Dividends + unrealised/realised gains | N/A (investment) |
Key Company: Berkshire Hathaway
- Berkshire Hathaway — world’s most famous conglomerate; BNSF, Geico, Berkshire Hathaway Energy; Apple is largest equity position ($90B+); Warren Buffett CEO; Greg Abel designated successor; $160B+ cash hoard as of 2024; Class A shares (BRK.A) and Class B (BRK.B)
Key Metrics for Conglomerates
Book Value per Share Growth
Berkshire’s historical scorecard — compounding book value at rates exceeding the S&P 500. Book value growth reflects retained earnings, subsidiary value gains, and equity portfolio appreciation. Buffett shifted emphasis to intrinsic value vs book value in recent years as the equity portfolio and float economics become more important.
Operating Earnings per Share
Berkshire reports “operating earnings” — excluding investment gains/losses from the P&L — to present the sustainable earning power of the underlying businesses. Operating earnings grew substantially as Geico’s underwriting returned to profitability in 2023 and BNSF volumes normalised.
Cash Position and Capital Deployment
Berkshire’s cash pile ($160B+ in Treasury bills as of mid-2024) reflects Buffett’s inability to find acquisitions large enough at attractive valuations. A large acquisition (a “major elephant” in Buffett’s terminology) is the most anticipated capital deployment event in finance. The cash hoard also provides downside protection — Berkshire can deploy aggressively during market dislocations.
Insurance Float and Underwriting Profitability
Float growth (more insurance business = more investment capital) and combined ratio (Geico’s underwriting profitability — below 100% = underwriting profit) are key metrics. Geico’s recovery from 2022’s underwriting loss to profitability in 2023 through pricing increases was a major positive catalyst.
The Berkshire Succession Question
Warren Buffett (age 93 as of 2024) has designated Greg Abel (head of Berkshire Hathaway Energy and non-insurance operations) as his successor. Charlie Munger, Buffett’s long-time partner, passed away in November 2023 at age 99.
The succession question is existential for Berkshire’s valuation premium: how much of the company’s culture, capital allocation judgement, and dealmaking reputation depends on Buffett specifically vs the institution he has built? This will be answered over time as Greg Abel takes a larger operational role.
Key Comparisons
Related Glossary Terms
- Free Cash Flow — subsidiary FCF flows to Berkshire for reallocation; the engine of value creation
- Return on Invested Capital — capital allocation quality measured by ROIC vs cost of capital
- EBITDA — subsidiary operating performance measured through normalised EBITDA
- Gross Margin — varies dramatically by subsidiary type and industry