Top 20 Property & Casualty Insurance Companies in the USA

Top 20 Property & Casualty Insurance Companies in the USA

Top 20 Property & Casualty Insurance Companies in the USA: Top 20 Property & Casualty Insurance Companies in the USA, Property & casualty (P&C) insurance is the backbone of financial protection for homes, cars, businesses, and liability exposures in the United States. Every year regulators and industry analysts publish rankings of the largest P&C writers based on direct premiums written or countrywide market share. Ranking methods vary slightly (group vs. company, all-lines vs. line-specific, calendar-year vs. reporting lag), but the names that repeatedly appear at the top are remarkably consistent.

When businesses and individuals have P&C insurance needed by contracts, they remain compliant with regulatory duties, apart from having enough protection from ruinous liability.

Below is a researched, current (reflecting market-share reports covering 2023–2024 filings) list of the Top 20 P&C insurance groups/companies operating in the U.S., followed by concise profiles, what each is known for, and why these firms matter to consumers, brokers and the market. (Sources: NAIC market-share reports and industry rankings/analysis such as AM Best and reinsurance/industry trackers.) NAICReinsuranceNe.wsAM Best News

Quick note on methodology and timing

• Many rankings use direct premiums written (DPW) as the primary metric; others use countrywide market share, net premiums, or line-by-line analysis. The list below synthesizes the most commonly cited industry rankings and NAIC market-share reports covering the most recent completed reporting period (filings through 2023/2024 as published). Where precise order varies across sources, companies are placed in a consensus ordering typical of NAIC/AM Best summaries. For specific, line-by-line rank (auto vs. homeowners vs. commercial), consult the NAIC market-share PDF and AM Best reports. NAICA.M. Best

The Top 20 (short list)

1. State Farm Group — Nation’s largest P&C writer. NAIC

2. Berkshire Hathaway (GEICO & other subsidiaries) — massive auto and commercial presence. ReinsuranceNe.ws

3. Progressive Group — market leader in private-passenger auto growth. NAIC

4. Allstate Insurance Group — large personal-lines insurer (auto/home). ReinsuranceNe.ws

5. Liberty Mutual Group — diversified P&C across retail and commercial lines. ReinsuranceNe.ws

6. Travelers Group — leading commercial lines and specialty P&C carrier. ReinsuranceNe.ws

7. USAA Group — top-ranked in customer satisfaction; focused on military families. ReinsuranceNe.ws

8. Chubb Ltd. Group — global specialty and high-net-worth property insurer. ReinsuranceNe.ws

9. Nationwide Group — mutual insurer with strong regional and personal lines footprint. ReinsuranceNe.ws

10. Farmers Insurance Group — broad agent network, personal & commercial lines. ReinsuranceNe.ws

11. American International Group (AIG) — major commercial lines and specialty products. AM Best News

12. CNA Financial — significant commercial lines, mid-market specialty insurer. AM Best News

13. The Hartford — strong small-business and commercial lines presence. NAIC

14. Travelers / (if listed separately above as group) — (see #6; Travelers often ranks high across lines). NAIC

15. WR Berkley Corporation — specialty underwriting and professional liability strength. AM Best News

16. American Family (AmFam) — strong regional player in personal lines and niche products. ReinsuranceNe.ws

17. Old Republic Group — big in commercial auto, specialty title & warranty segments. ReinsuranceNe.ws

18. AXA Insurance (US operations)/Group — global reinsurer/insurer footprint; top-25 by countrywide premium. NAIC

19. Markel Group — specialty, niche markets and excess & surplus lines focus. AM Best News

20. Munich Re / (ERGO/Transatlantic/U.S. subsidiaries) — reinsurer with large U.S. P&C footprint through subsidiaries and specialty units. NAIC

Important: Some sources aggregate by group (parent + subsidiaries), while others rank individual companies. Depending on whether you count GEICO under Berkshire Hathaway or separately, or treat Chubb’s and Berkshire’s specialty units differently, the exact order can shift slightly. The NAIC market-share reports (countrywide, line-by-line) and AM Best rankings are the primary authoritative references for direct-premium-based ranking. NAICA.M. Best

Detailed profiles — what each company is known for (and why they rank highly)

1. State Farm Group

Why they’re #1: State Farm has long been the largest writer of personal-lines P&C in the U.S. thanks to its dominant private-passenger auto franchise, wide agent network, and strong regional presence. The group consistently leads in direct premiums written and remains the single largest market-share holder in many states and lines. For many consumers, State Farm is synonymous with local agents and personal service. NAIC

2. Berkshire Hathaway (GEICO and subsidiaries)

Why they rank so high: Berkshire Hathaway’s P&C footprint includes GEICO (a top auto writer), Berkshire Hathaway Reinsurance, and a set of specialty insurers. GEICO’s direct-to-consumer, cost-focused auto model drives huge auto volume and strong market position. Berkshire’s balance-sheet strength gives it scale in reinsurance and commercial risk-taking. ReinsuranceNe.ws

3. Progressive Group

Strengths: Progressive is a growth leader in private-passenger auto through sophisticated pricing and product innovation (usage-based programs, digital quoting). It has also expanded in commercial auto and specialty lines, helping it climb rankings rapidly. NAIC

4. Allstate Insurance Group

Profile: Allstate is a major personal-lines carrier — auto and homeowners — with a large captive and independent agent base plus national direct channels. Allstate’s broad distribution and brand scale keep it among the very largest P&C writers. ReinsuranceNe.ws

5. Liberty Mutual Group

Why they’re big: Liberty is a global P&C insurer with a strong U.S. retail and commercial presence, including specialty segments, surety and large commercial accounts. Its diversified book and international reach add to premium volume. ReinsuranceNe.ws

6. Travelers Group

Niche & strengths: Travelers is particularly strong in commercial P&C and specialty coverages — property & casualty for middle-market businesses, surety, and specialty casualty. Travelers’ underwriting focus and distribution through brokers position it as a leader in commercial lines. ReinsuranceNe.ws

7. USAA Group

Why consumers rate it highly: USAA serves military members and their families and consistently earns top marks for claims service and satisfaction. USAA’s focused membership model, combined with competitive auto and homeowners pricing, keeps its premium volumes high relative to its membership base. ReinsuranceNe.ws

8. Chubb Ltd. Group

Specialty & HNW: Chubb is best known for high-net-worth personal lines, specialized commercial property, and specialty casualty products. Its underwriting discipline, risk appetite for complex property exposures, and global footprint make it a top P&C player. ReinsuranceNe.ws

9. Nationwide Group

Profile: Nationwide is a mutual insurance company with strong regional roots and diversified P&C operations, selling personal and commercial lines through agents and brokers. Its cooperative structure and product breadth help it retain and grow premium base. ReinsuranceNe.ws

10. Farmers Insurance Group

Why it’s large: Farmers combines a wide agent network with a suite of personal and commercial products. Farmers’ multi-channel distribution and focus on customer segmentation support premium scale. ReinsuranceNe.ws

11. AIG (American International Group)

Commercial strength: Once the poster child of global insurance, AIG today focuses on commercial lines, specialty risk, and large corporate accounts. It remains a sizable P&C commercial underwriter through brokered placements and specialty divisions. AM Best News

12. CNA Financial

Mid-market & specialty: CNA focuses on commercial P&C, specialty liability and professional lines. Its presence in middle-market business insurance and specialty indemnity products keeps it among the larger U.S. writers. AM Best News

13. The Hartford

Why it matters: The Hartford specializes in small-business commercial insurance, group benefits and personal lines; it is a prominent player for SME insurance and commercial auto. A strong agency and broker distribution network supports its ranking. NAIC

14. WR Berkley Corporation

Specialty focus: WR Berkley has built scale on specialty underwriting, professional liability, and niche commercial lines. Its decentralized underwriting model has proven resilient across market cycles. AM Best News

15. American Family (AmFam)

Consumer focus: American Family is a regional heavyweight in personal auto and homeowners insurance, with strong brand recognition in the Midwest and growing national presence. ReinsuranceNe.ws

16. Old Republic Group

Where they’re strong: Old Republic is a leader in specialty areas such as commercial auto, title insurance and warranty segments. These niche exposures produce steady premium streams and a substantial market position. ReinsuranceNe.ws

17. Markel Group

Niche & E&S lines: Markel’s specialty underwriting and excess & surplus (E&S) focus — including professional liability and emerging risks — gives it a unique portfolio that has grown premium share. AM Best News

18. AXA (U.S. operations) / Large global group members

Global scale in U.S. footprint: While AXA’s U.S. presence is smaller than some domestically headquartered groups, in aggregated countrywide premium measurements it appears among the top 25 due to its diversified commercial and specialty lines via U.S. subsidiaries. NAIC

19. Munich Re (and US subsidiaries including Hartford Steam and others)

Reinsurer-major with U.S. reach: Munich Re is a global reinsurance behemoth with sizable primary market operations through U.S. subsidiaries and specialty units — contributing to its ranking among countrywide premium leaders. NAIC

20. (Other large groups that often appear near top 20) — e.g., Selectives depending on the source: AmTrust, Selective, Mercury General, Erie Insurance, Auto-Owners.

Why this cluster matters: Several regional, mutual, and specialty groups swing in and out of the top-20 depending on how you count groups vs. companies and which lines are emphasized. Many of these firms dominate geographically or by product niche (e.g., California homeowners, private auto, commercial lines). ReinsuranceNe.wsAM Best News

What the rankings tell us (market dynamics and trends)

1. Auto drives P&C volume. Private-passenger auto insurance typically accounts for the single largest share of P&C premiums; that’s why companies with dominant auto books (State Farm, GEICO/Berkshire, Progressive, Allstate) often top overall premium rankings. The NAIC data highlights how crucial auto is to industry premium totals. NAIC

2. Specialized underwriting matters. Large premium totals can also come from commercial lines and specialty products (Chubb, Travelers, WR Berkley, Markel). Specialty insurers often enjoy better margins (through disciplined underwriting and higher pricing power) even if they write less volume than mass-market auto carriers. AM Best News

3. Geography & distribution shape portfolios. Insurers with massive agent networks (State Farm, Allstate, Farmers) or direct channels (GEICO, Progressive) reach premiums differently. Regional mutuals (Erie, Auto-Owners) show that concentrated geographic excellence can sustain large premium positions. ReinsuranceNe.ws

4. Balance sheet & capital position matter for large cat risks. Large groups (Berkshire, Munich Re, Chubb) use balance-sheet strength to underwrite catastrophe-prone portfolios and complex commercial risks — a capability smaller carriers often avoid. This shapes their market roles during catastrophic years. S&P Global Market IntelligenceBarron’s

What this means for consumers and brokers

• Consumers should compare price, claims service, and financial strength. A top-20 rank shows scale but not necessarily personal-level service; niche regional players often beat national giants on claims satisfaction in their territories (e.g., USAA, Erie). Look beyond size: check AM Best ratings, NAIC complaint ratios, and customer reviews. AM Best NewsNAIC

• Brokers/agents should match insurer appetite to the risk profile. Large national carriers are excellent for standardized personal lines or mass-market commercial coverage; specialty carriers are better for unusual or high-limit risks. AM Best News

• Risk managers must consider insurer balance-sheet and reinsurance strategy for catastrophe-exposed portfolios — the difference between a top writer’s capacity and a mid-market insurer’s capacity can be decisive after major events. Barron’s

Caveats & how to interpret “Top 20”

• Different metrics, different answers. “Top” could mean highest direct premiums written, greatest market share, highest revenue, best profitability, or strongest capital position. The list above emphasizes direct premiums / market share as reported in NAIC / AM Best datasets — the most common method for ranking P&C carriers. NAICA.M. Best

• Group vs. company level. Many insurers operate through multiple subsidiaries; rankings by group (parent company plus subsidiaries) can differ from rankings that list individual legal entities. The NAIC reports provide both group and company breakdowns. NAIC

• Year-to-year movement is normal. Premium growth (especially in auto) and strategic acquisitions cause rank changes. For example, Progressive and Berkshire have seen rapid moves in recent years because of organic growth and market shifts. Always check the publication date for a ranking. ReinsuranceNe.wsA.M. Best

How to use this information (practical steps)

1. If you’re buying insurance: Don’t pick solely based on company size. Check financial strength (AM Best, S&P), read policy forms for coverage limits/exclusions, and compare claims-service metrics.

2. If you’re an agent/broker: Use the list to identify carriers to approach for different risks — scale carriers for standard personal lines, specialty carriers for unusual or high-limit placements.

3. If you’re researching the market: Use NAIC’s market-share PDF for line-by-line data and AM Best/Best’s Review for writer rankings by direct premiums and line performance. NAICA.M. Best

Closing thoughts — what to watch next

Top 20 Property & Casualty Insurance Companies in the USA, the P&C landscape is dynamic. Pricing cycles, catastrophe seasons, regulation, and technology (usage-based insurance, telematics, AI for claims automation) continue to reshape market share. Expect the big auto writers to remain dominant as long as auto remains the single largest premium pool, but watch specialty carriers for margin leadership and innovative products. For the latest, consult the NAIC market-share publications and AM Best rankings each year; they provide the authoritative, line-by-line snapshots that determine which companies sit in the top 20. NAICAM Best News