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Insurers need two profit engines
A fortress balance sheet gets built through two main engines of profitability. One is underwriting, and the margin there is thin. The other is the asset side. Buying a 4 or 5 percent investment grade bond is a very different path from aiming for a 7, 8, 9, or 10 percent return on the whole portfolio, and the gap between them is all the difference in the world.
About 70 to 75 billion of the roughly 120 billion in capital at Liberty Mutual is reserves, the tightly managed part that has to keep the promise of every policy. Even there, the approach is not to buy investment grade bonds, put them in a drawer, and wait for a coupon each quarter until maturity, which is how this type of capital pool was managed historically.
The amount of capital an insurer has dictates the opportunity set on both the liability side and the asset side. Data centers are a new scale of asset and value, too large for insurance balance sheets to absorb alone, which is why third-party capital extends into them. A fortress balance sheet can do things others won't.
How does float make insurance profitable?
Insurers collect premiums up front and pay claims later, sometimes years later. The money held in between is called float, a term Warren Buffett popularized in his shareholder letters. The insurer invests that money and keeps the returns. If premiums exceed claims and costs, which gives a combined ratio under 100 percent, the insurer earns an underwriting profit on top of its investment income.
Why do insurers hold so many bonds?
Insurers owe claims that are fairly predictable and often far in the future, so they match them with assets that pay steady income. Investment grade bonds fit that pattern well. In the United States, risk-based capital rules from state insurance regulators, set through the National Association of Insurance Commissioners, require less capital for higher-rated bonds than for riskier assets. This has made bonds the traditional core of insurance portfolios.
How are reserves different from surplus?
Reserves are amounts an insurer sets aside to pay claims it expects to owe on policies already written. Surplus is what remains when the insurer's liabilities are subtracted from its assets. It acts as a cushion if claims come in higher than expected. Regulators and rating agencies measure both when judging an insurer's financial strength.
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