The US Insurance Market, Explained

Educational reference from Owning Risk. Every figure is cited to a primary source; approximations and data vintages are labeled. Nothing here is investment, legal, or insurance advice.

The market at a glance

US property & casualty direct premiums written hit $1.05 trillion in 2024 — the first trillion-dollar year on record (S&P Global Market Intelligence). US health insurance direct premiums ran ~$1.2 trillion (NAIC), and US life/annuity premiums, considerations, and deposits totaled $824.5 billion (NAIC via III).

The P&C industry's combined ratio moved from 96.6 in 2024 to 92.2 in 2025 (AM Best). Policyholders' surplus — the capital cushion backing every policy — stood at $1.13 trillion at year-end 2024, an all-time high (NAIC). Insurance employs roughly 3.0 million Americans (BLS via III), sold through about 39,000 independent agencies (Big "I" Agency Universe Study, 2024). Independent agents place 62% of all P&C premium overall — and 87.7% of commercial lines (Big "I" 2026 Market Share Report, 2025 data).

1. Three industries, not one

"Insurance" in the United States is really three distinct industries that happen to share a regulatory framework.

**Property & casualty (P&C)** protects things and liabilities — cars, homes, businesses, lawsuits. In 2024 it crossed $1.05 trillion in direct premiums written for the first time in history, growing 8.0% (S&P Global MI; NAIC's slightly broader basis: $1.06T, +9.7%). This document focuses here.

**Health insurance** is the largest of the three by premium: roughly $1.2 trillion of direct written premium in 2024, up 6.9% (NAIC Health Industry Analysis). Different economics, different regulation — best analyzed separately.

**Life and annuities** collected $824.5 billion in premiums, considerations, and deposits in 2024 — $172.8B of life premium, $432.2B of annuity considerations, and $218.4B of accident & health written by life insurers (NAIC via III).

Together, insurance employs about 3 million Americans — roughly 1.62 million at carriers and about 1 million at agencies and brokerages — and represents approximately 3% of US GDP.

2. The trillion-dollar P&C market: personal vs. commercial

The first and most important split in P&C is who's buying.

**Personal lines — $534.9B (2024):** insurance bought by individuals, dominated by auto and home.

**Commercial lines — $502.4B (2024):** insurance bought by businesses, from the corner restaurant's GL policy to a Fortune 500 property program.

The near 50/50 split conceals opposite structures. Personal lines are concentrated (a handful of national brands, heavy advertising, direct and captive-agent distribution) and highly rate-regulated. Commercial lines are fragmented across thousands of intermediaries, negotiated rather than advertised, and — in their specialty corners — much more lightly rate-regulated. Almost everything else in this document flows from that difference.

3. The product map: P&C line by line (2024 DPW)

**Private passenger auto — $358.97B (+13.3%).** Largest line in all of P&C. Liability $182.4B + physical damage $158.5B (NAIC).

**Homeowners — $169.6B (+11.1%).** S&P GMI basis; NAIC's broader basis shows $173.2B.

**Other liability (GL, umbrella, E&O, cyber) — $123.3B.** Occurrence $83.6B (+10.3%) + claims-made $40.4B (–0.1%) (NAIC).

**Commercial auto — $70.9B (+10.2%).** Liability $54.6B + physical damage $16.4B (NAIC).

**Commercial multiple peril (package) — $67.1B.** Property $45.5B + liability $21.6B (NAIC).

**Workers' compensation — $55.4B (–5.3%).** The rare shrinking line: rates falling on strong results (S&P GMI; NAIC basis $57.5B).

**Fire — $31.8B (+12.4%). Allied lines — $31.2B (+11.1%).** (NAIC)

**Standalone cyber — $7.1B (–2.3%).** First-ever annual decline after years of hypergrowth (NAIC / AM Best).

**Private flood — $1.3B (–10.7%).** Tiny vs. the federal NFIP (III/NAIC).

Three storylines inside that table are worth telling on their own.

**Auto insurance had a historic repricing.** Private passenger auto grew 13.3% in 2024 on top of double-digit growth in 2023 — not because Americans bought more cars, but because rates surged to catch up with claims inflation. The motor-vehicle insurance component of CPI peaked at +22.2% year-over-year in March 2024 — one of the largest sustained increases of any consumer category — before moderating to roughly 11–12% by mid-2025 (BLS via The Insurer/Bankrate).

**Cyber ended its hypergrowth phase.** After roughly quintupling between 2018 and 2022, standalone cyber premium fell 2.3% in 2024 to $7.1B — the first decline on record — as competition returned and pricing softened (NAIC 2025 Cyber Report; AM Best).

**Workers' comp is the profitable outlier.** It's the only major line where premiums are falling (–5.3%) because results are so good — over a decade of favorable claims trends has produced year after year of rate decreases.

4. Who underwrites it: the carrier landscape

Roughly speaking, the top of the market is concentrated and the middle is vast. The ten largest P&C groups write just over half of all US premium (51.4%, NAIC 2024 market share data):

**1. State Farm — $108.98B (10.2%).** **2. Progressive — $75.88B (7.1%).** **3. Berkshire Hathaway (incl. GEICO) — ~$62–63B (~6.0%).** **4. Allstate — $55.86B (5.3%).** **5. Liberty Mutual — $42.75B (4.1%).**

**6. Travelers — $41.85B (4.0%).** **7. USAA — $36.09B (3.5%).** **8. Chubb — $32.29B (3.1%).** **9. Farmers — $28.29B (2.7%).** **10. Zurich — $18.48B (1.8%).**

Concentration is a personal-lines phenomenon: the giants are overwhelmingly auto-and-home franchises. Commercial insurance — especially specialty commercial — spreads across hundreds of carriers, which is precisely why the distribution system below matters so much.

5. How insurance reaches buyers: the three front doors

Every policy reaches its buyer through one of three retail channels — and the mix flips completely depending on what's being insured.

**Independent agents & brokers — 62% of all P&C premium (2025 data).** About 39,000 independent agencies plus the large brokerages sell policies from many competing carriers. They place 87.7% of commercial lines — for business insurance, the independent channel essentially is the market — but only 39.5% of personal lines (Big "I" 2026 Market Share Report).

**Captive/exclusive agents — roughly a fifth of the market.** Agents who sell one carrier's products: the State Farm, Allstate, and Farmers model. About 21% of total P&C premium (Big "I" 2024 report, 2023 data), concentrated in personal auto and home.

**Direct — roughly 16%.** No agent at all: buy online or by phone. Almost entirely a personal-auto phenomenon (GEICO and Progressive Direct built it; USAA runs a hybrid). Direct-to-business insurance exists but remains a low-single-digit share of commercial premium.

6. The hidden layer most people never see: wholesale & surplus lines

When a risk is too new, too large, or too unusual for standard ("admitted") carriers, it moves through a second, less visible system.

**Excess & surplus lines (E&S)** is the market for non-standard risk, written by carriers exempt from most state rate-and-form regulation in exchange for fewer consumer protections. It has been the fastest-growing corner of US insurance for years: $129.8B of premium in 2024, up 12.3% — the seventh consecutive year of double-digit growth (AM Best/WSIA). The 15 state stamping offices reported $90.3B in 2025, up 7.8% (WSIA, January 2026). E&S has roughly tripled since 2018 and now represents about one of every eight P&C premium dollars.

**Lloyd's of London** remains the single largest player in US surplus lines: $20.8B of 2024 premium, about 16% of the E&S market; the top 25 US groups plus Lloyd's account for roughly two-thirds of it (AM Best).

**Wholesale brokers** are the intermediaries retail agents call when they can't place a risk with standard markets. The channel is strikingly concentrated: Amwins reports placing over $39B annually, CRC reports $33B (company figures), and Ryan Specialty's FY2025 revenue reached $3.05B. The wholesale layer sits inside the independent-agent channel — a toll booth for hard-to-place commercial risk — and now touches an estimated quarter-plus of commercial premium.

7. The MGA boom: underwriting without the balance sheet

One of the most important structural shifts in modern insurance: carriers increasingly rent out the pen. A managing general agent (MGA) is a specialized firm that underwrites policies on a carrier's behalf — selecting risks, setting prices, issuing policies — without holding the capital itself.

Conning's 12th annual study puts US MGA premium at $114.1B for 2024, up 16% — the fourth straight year of double-digit growth, expanding far faster than the overall market.

Supporting the boom is the rise of fronting carriers — insurers whose business model is lending their licenses and ratings to MGA programs while passing most risk to reinsurers. Fronting supported more than $18B of MGA premium in 2024 (+26%), about 20% of all MGA business, with four fronting specialists each supporting over $1B (Conning).

The MGA is where insurance entrepreneurship now happens. Launching a full carrier takes years and hundreds of millions in capital; launching an MGA takes a niche, underwriting talent, and a capacity partner. The trade-off — underwriting authority separated from the capital bearing the risk — is also the structure regulators and rating agencies watch most closely.

8. Where government steps in: residual & public markets

When private markets won't write a risk at an acceptable price, public and quasi-public mechanisms absorb it. Small in premium, enormous in policy relevance — and where climate stress shows up first.

**Florida Citizens** — the state-backed property insurer of last resort — is the market's best depopulation story. From a peak of 1.42 million policies in October 2023, Citizens shrank to 768,926 by September 2025 and projected roughly 385,000 by year-end 2025 — a 73% decline — as reforms drew private (largely E&S and newly formed) carriers back into Florida. Its 2026 rate recommendation was actually a small decrease.

**The California FAIR Plan** is the mirror image, moving the wrong direction: about 668,000 policies in force and ~$724B of exposure (January 2026), with written premium climbing from $87M in 2018 to roughly $1.96B by the end of 2025 as wildfire risk pushed private carriers out. One state's residual market is emptying while another's quadruples — the cleanest illustration in the country that insurance availability is now a climate story.

**The National Flood Insurance Program (NFIP)** remains the backbone of US flood coverage with about 4.66 million policies (CRS, 2024) and roughly $4B in annual premium and fees; the private flood market is still just $1.3B. **Federal crop insurance** channels roughly $10.4B a year in federal premium subsidies (USDA ERS, 2024) through private insurers — American agriculture's risk backbone.

9. The market behind the market: reinsurance

Insurers buy insurance too. Reinsurance spreads catastrophe and volatility risk globally, and its capacity sets the ceiling for what primary insurers can write.

Global dedicated reinsurance capital reached $648B at year-end 2025 — $513B traditional plus a record $135B of alternative capital (catastrophe bonds and other ILS), per Gallagher Re. Aon's broader measure puts total reinsurance capital at $760B+ (Q3 2025).

Access runs through an extraordinarily concentrated broker layer: Aon Reinsurance Solutions ($2.66B of 2024 revenue) and Guy Carpenter ($2.54B) alone dominate placement, with the top four intermediating the large majority of broked business.

10. Ten numbers that tell the whole story

**$1.05 trillion** — 2024 US P&C premium: the first trillion-dollar year (S&P Global MI).

**~$3 trillion+** — the full US insurance economy across P&C, health, and life/annuity (S&P GMI/NAIC/III).

**$358.97 billion** — private passenger auto, the largest single line (NAIC).

**+22.2%** — peak yearly jump in US auto insurance CPI, March 2024 (BLS).

**51.4%** — share of P&C written by just ten carrier groups (NAIC).

**87.7%** — share of commercial insurance sold through independent agents (Big "I," 2025 data).

**$129.8 billion** — surplus lines premium, after seven straight years of double-digit growth (AM Best/WSIA).

**$114.1 billion** — premium underwritten by MGAs, insurance's entrepreneurial layer (Conning).

**–73%** — collapse in Florida Citizens' policy count from its 2023 peak, as private carriers returned (Citizens/Florida Trend).

**92.2** — the industry's 2025 combined ratio, its most profitable underwriting year in decades (AM Best).

Methodology and source notes

Bases differ across sources. "Direct premiums written" (DPW) measures premium before reinsurance; "net" measures after. S&P Global MI and the NAIC use slightly different aggregation bases (hence $1.05T vs. $1.06T; homeowners $169.6B vs. $173.2B; workers' comp $55.4B vs. $57.5B). Each figure is cited to the source used, and bases are not mixed within a row.

Owning Risk is independent insurance-industry intelligence. This is analysis, not investment, legal, or insurance advice.