Today's cyber risks, ranging from ransomware and cyber extortion to business interruption and data breach fallout, have far-reaching effects on businesses. These constant and evolving threats are handled by some of the largest cyber insurance companies that have global reach and a significant US presence.
In this article, we list some of the best cyber insurance companies in the USA by market share. Prospective buyers of their policies should remember that market share is only the starting point for making an informed decision. How a carrier conducts its cyber incident response is just as important.
Here's a list of the best cyber insurance companies operating in the US, arranged according to their market share from largest to smallest. Their Direct Written Premiums (DWP) are included and are totals recorded as of 2024.
The data has been provided by the NAIC and is available for subscribers to see in our IB Data Hub tool.
Market share: 7.92%
2024 cyber DWP: $560.6 million
Chubb holds the largest share of the US cyber market among domestic groups in the NAIC data. Its cyber book combines standalone and packaged coverage, and the data indicates Chubb remains profitable while still paying a significant volume of claims. This matters to brokers because it often translates into tested wordings, a broad underwriting appetite, and established claims protocols.
Chubb's position at the top of the table means many retail and wholesale brokers will already have experience placing cyber risks with the group. When you structure programs for mid‑market and larger clients, you can treat Chubb as a benchmark for pricing and terms. Its stance on controls, limits, and retentions can work as a reference point when negotiating with other markets.
Market share: 7.56%
2024 cyber DWP: $535.4 million
Travelers is the second‑largest U.S. cyber writer by market share in the info from our Data Hub and remains a core market for brokers that place cyber liability insurance alongside property and casualty programs. The group's size in cyber means it regularly handles claims linked to ransomware, data breach incidents, and business interruption, which is important when you want an insurer that understands how cyber events affect operations and financial losses.
In its 2025 Travelers Risk Index, the company reported that 25% of surveyed businesses experienced a data breach or cyber event in the past year, underlining how widespread cyber threat exposure has become for small businesses and larger firms alike.
Market share: 5.09%
2024 cyber DWP: $360.6 million
Fairfax Financial holds a solid third place by U.S. cyber DWP, which shows that it is a meaningful player in cyber coverages rather than a niche writer. For brokers, Fairfax is relevant when you build multi‑carrier towers that need stable capacity for insurance coverage addressing cyber risks such as extortion, network outages, and regulatory exposure.
Recent market commentary indicates cyber insurers collectively generated about US$9 billion in underwriting profit from 2022 to 2024, which has encouraged many carriers, including medium‑sized groups like Fairfax, to keep deploying capacity even as rates soften.
Market share: 5.03%
2024 cyber DWP: $356 million
Tokio Marine ranks just behind Fairfax by market share and is an important name for brokers that serve U.S. clients with international footprints. The group's cyber units, including Tokio Marine HCC and Tokio Marine Kiln, write cyber liability insurance across a wide range of sectors, which helps when you need coordinated risk management and incident response for global cyber events.
In late 2025, Tokio Marine Kiln hired a new cyber underwriter as part of a plan to strengthen its cyber and enterprise risk team after launching its TMK Cyber Ctrl and Enterprise Ctrl offerings, signaling continued investment in cyber underwriting expertise. Tokio Marine also made our list of 5-Star cyber insurance companies in the US.
Market share: 4.81% %
2024 cyber DWP: $340.4 million
That scale allows AXA to offer a wide range of insurance coverage options, from complex corporate programs to solutions that can be considered among the best cyber insurance options for small businesses.
In the past year, AXA XL has focused heavily on strengthening the service layer around what its cyber insurance covers. In 2025, it was reported that AXA XL launched a new suite of proactive cybersecurity assessment services for US cyber policyholders. This was offered at a discounted flat rate through 2025, to help clients address ransomware, business email compromise and supply‑chain vulnerabilities before they turn into claims.
Market share: 4.03%
2024 cyber DWP: $285 million
Arch is a key cyber capacity provider for complex and higher‑limit accounts, especially where cyber insurance covers large potential financial losses from business interruption and major data breach events. Its place in the top 10 indicates that it has enough volume to have seen a wide range of cyber claims while still keeping a disciplined approach to cyber risks.
Analysts note that the wider cyber market has seen a reset in pricing, with cyber rates down around 27% since mid‑2022, supported by strong underwriting results across carriers. That backdrop matters for Arch because it shapes how far it can compete on price without undermining margins in its cyber portfolio.
Market share: 3.96%
2024 cyber DWP: $280.6 million
At‑Bay stands out as a cyber‑focused specialist rather than a traditional multiline giant. Brokers often look to At‑Bay when they want the cyber insurance for small business clients that also need hands‑on security support. The group combines cyber liability insurance with active monitoring and guidance, which is attractive for insureds that want help in reducing the chance that a cyber threat turns into a claim.
Recent claims analysis shows that At‑Bay's team sees managed detection and response (MDR) platforms as one of the most effective controls. According to one report, insureds that used MDR suffered significantly less damage from intrusions and sometimes avoided filing claims because threats were contained before serious harm occurred.
Market share: 3.91%
2024 cyber DWP: $276.5 million
AIG remains a major cyber carrier for large and complex risks, which is why many brokers include it when they build towers for multinationals and critical‑infrastructure clients. Its scale in specialty and financial lines helps when a single cyber event triggers multiple insurance coverage sections, from cyber liability insurance and privacy legal expenses through to business interruption and reputational harm.
At the corporate level, AIG has been reshaping itself into a pure‑play P&C group and completed the divestiture of its life and retirement business, Corebridge, in 2025. A detailed analysis of the company notes that AIG has invested in proprietary AI tools to model cyber risk so it can price policies for large, complex exposures more accurately.
Market share: 3.71%
2024 cyber DWP: $262.7 million
Sompo's place in the top 10 shows that it has a meaningful US cyber footprint, even though it is still better known in some markets for other commercial lines. For brokers, Sompo can be a useful additional market when you need more capacity for clients with demanding cyber requirements, including layered coverage for ransomware, cyber extortion, and supply‑chain disruption.
In 2025, Sompo made headlines by acquiring Aspen Insurance Holdings for about $3.5 billion to expand its reach outside Japan. That deal supports its ambition to grow specialty business globally, including cyber, which may give US brokers more options as Sompo integrates Aspen's platforms. Brokers will need more choices in the coming years, as cyber security threats are only expected to worsen as bad actors harness AI.
Market share: 3.71%
2024 cyber DWP: $262.7 million
Starr rounds out this list of cyber insurance companies and gives brokers another recognized name in the insurance industry when structuring cyber programs. While it is widely known for aviation and other specialty lines, its place in this ranking confirms that Starr also writes a sizeable cyber liability insurance portfolio. This insurer has the ability to help cover the cost of legal expenses, forensics, and recovery after severe cyber events.
These are only the top 10 best cyber insurance companies catering to the US market, and there are many more. The important question is, how do you choose among them? Here are crucial considerations:
1. Match coverage to the client's real risk
Understand what data and systems matter most (what would stop them trading, and for how long).
Check if they meet the "minimum controls" most insurers expect (MFA, backups, patching, basic policies), since underwriters now focus on these before offering terms.
For each quote, look beyond the limit and price:
Watch especially for "known vulnerability" or failure‑to‑maintain‑security exclusions, which can bar claims if a serious flaw was left unpatched.
Prioritize carriers with clear 24/7 access, named forensic and legal panels, and a defined process for handling a suspected breach. AIG, for example, offers a dedicated cyber claims hotline and a specialist team to manage response. Give extra weight to policies that include practical pre‑breach services (security assessments, training, tabletop exercises), not just wording on paper.
Sign up for a premium subscription for access to the IB Data Hub. Its customizable dashboard lets you look up data from the NAIC and sort it by different US states, insurance lines, and years, along with a number of other breakdowns.
