The American insurance brokerage market has always been competitive. What it has not always been is this litigious. In the space of roughly eight months from August 2025, five of the industry's most prominent firms - Marsh, Aon, Willis Towers Watson, Brown & Brown, and Alliant - all found themselves filing or defending lawsuits over similar, fundamental allegations: that a rival had systematically stripped away their people, their clients, and their confidential data.
The resulting tangle of legal actions, mapped in the table accompanying this article, tells a story about an industry undergoing a structural power shift - one being contested, in substantial part, in federal and state courtrooms across the country.
Since launching in August 2025, Howden has hired an estimated 500+ staff from rivals, triggering lawsuits from Marsh, Aon, WTW, Brown & Brown and Alliant. All names below are confirmed via court filings or multiple trade press sources. Click any row for detail.
Confirmed via court filings or trade press only. Sources: Insurance Journal, Business Insurance, The Insurer, Star Tribune. April 2026.
One firm generating a significant amount of litigation in 2025 was Howden US, the American retail broking operation that London-based Howden launched in August of that year. Within months of opening its doors, it was facing lawsuits from Marsh, Aon, Willis Towers Watson, Brown & Brown, and Alliant - five separate actions, each telling a version of the same story.
The context matters. Howden had spent much of late 2024 and early 2025 attempting to acquire Risk Strategies, a major US broker valued at approximately $10 billion, in a deal that would have given it a credible platform for a US retail operation and potentially a springboard to a public listing. That deal ultimately fell through when Accession Risk Management (parent of Risk Strategies) was acquired by rival Brown & Brown, reigniting Howden's hiring push across the Atlantic. With the acquisition route closed, Howden pivoted to what its critics would come to call a "talent-led market entry strategy" - building a business not through organic growth or conventional acquisition, but by recruiting entire teams from competitors, complete with their institutional knowledge, their client relationships, and, according to a string of lawsuits, their employers' confidential information.
The allegations followed a consistent pattern. Aon accused Howden US of having a "troubling and well-established pattern of unlawfully poaching competitors' employees and misappropriating confidential information - conduct that warrants injunctive relief." In early April, news broke that Aon had settled with Howden over former Aon MD, Anthony Rampersaud and a number of others.
Marsh said its executives had "worked covertly over many months, all while being handsomely compensated by Marsh, to aggressively solicit Marsh's employees to join them at Howden." WTW accused Howden of "coast-to-coast raids" that could sweep up more than 100 employees at once, describing the strategy as a cheaper, faster path to US expansion than building organically.
The climax came in December. Howden hired approximately 200 Brown & Brown employees overnight on December 18–19, targeting the legacy Hays Companies employee benefits operation. The move was striking not just in scale but in its timing - executed over the holiday period to, in Brown & Brown's telling, inflict "maximum competitive harm" and hinder the firm's ability to seek swift legal relief. The Howden-driven talent war cost Brown & Brown $23 million in revenue, according to its president and CEO.
Brown & Brown's complaint described what it called "one of the most enormous, calculated and predatory schemes of trade secret theft, contractual breaches, breach of fiduciary duty, tortious interference, and unfair competition the brokerage industry has ever seen." Courts have not been unsympathetic to the aggrieved parties. Injunctions and temporary restraining orders have been granted in multiple cases, with former employees ordered to return confidential materials and barred from servicing clients they brought with them.
Howden has not commented extensively on the individual lawsuits. The firm reported adjusted revenue of £3.01 billion for the fiscal year ending September 2024, a 23% year-over-year increase, and its US expansion - however contentious - has generated real momentum in a short time.
Company profile
David Howden founded his brokerage in 1994 with three employees, a rented office, and a dog named Flight. Three decades later, Howden Group Holdings is one of the largest insurance brokers in the world, operates in 55 countries, and carries an enterprise value approaching £20 billion. Its US expansion - and the legal chaos it has unleashed - is the latest chapter in one of the most remarkable growth stories in the industry.
From day one, David Howden built his company around a single idea: the people who work there should own it. Today around a third of the workforce - approximately 5,300 employees - are shareholders, making Howden the fifth largest employee-owned business in the UK.
The model works by reinvesting profits back into the business rather than paying dividends, and running regular internal share offer schemes that allow staff to buy in. Howden argues this is the key to its talent retention, its organic growth, and its ability to attract senior brokers who want to build something they own rather than collect a salary.
It is also, notably, the pitch David Howden makes when recruiting from rivals: come and work for a firm where you are an owner, not an employee. That pitch has proved powerful enough to trigger the largest talent war in the recent history of the US brokerage industry.
Growth timeline
David Howden, Mark Pangborn and Mark Howells found Howden Pangborn in a rented London office, initially trading as a wholesale professional indemnity broker. The company is bootstrapped from founders' savings with no external equity.
Howden makes its first acquisition, Spear Gulland, taking headcount to just over 20. The growth-by-acquisition playbook that will define the next three decades begins here.
Howden opens its first overseas office in Madrid. In the same year DUAL is launched - an underwriting agency that grows into one of the world's largest international Managing General Agents (MGAs), diversifying Howden's revenue beyond pure broking.
Howden reaches new continents with the launch of Howden India and DUAL Australia. By its 10th anniversary the group has surpassed 230 employees globally.
General Atlantic invests in 2013, providing capital for larger acquisitions. Windsor and RKH Group are acquired, building out specialty and reinsurance expertise. The group operates under the Hyperion name throughout this period.
Howden acquires A-Plan Group and Aston Lark in back-to-back deals, creating one of the largest UK retail broking operations. The group rebrands from Hyperion to Howden Group Holdings. Revenue passes £1 billion for the first time.
Howden acquires TigerRisk, a leading US-founded reinsurance broker, rebranding it Howden Tiger. The deal provides a major reinsurance platform and Howden's first meaningful US foothold. The group now has nearly 15,000 employees.
Howden completes 65 strategic acquisitions across five years, with a particular focus on Europe. Revenue reaches £3 billion and the enterprise value approaches £20 billion. The group is widely discussed as an IPO candidate, with David Howden targeting a listing by 2030.
Howden holds talks to acquire Risk Strategies, a US retail broker. The talks collapse. Brown & Brown ultimately acquires Risk Strategies for $9.825 billion, directly blocking Howden's preferred acquisition route into US retail.
Howden pivots to a recruitment-led strategy. Four senior Marsh Florida executives resign on 21 July; Marsh sues on 29 July. Howden formally launches Howden US on 4 August, naming former Marsh Florida Zone Leader Mike Parrish as US CEO and former Hays Companies founder Jim Hays as vice chairman. Over the following months, more than 100 Marsh staff follow the initial four executives. Lawsuits from Marsh, Aon, WTW, Brown & Brown, and Alliant follow.
Howden agrees to acquire Atlantic Global Risk LLC, the leading independent US transaction liability broker, in a deal announced 5 January 2026. Terms were not disclosed. The deal combines Howden's existing international transactional liability leadership with Atlantic's US expertise, and signals a shift from purely talent-led US growth to acquisition-backed expansion. Parrish is later elevated to CEO, Americas.
Who owns Howden
Sources: Howden Group Holdings company filings and announcements, Business Insurance, Insurance Journal, The Insurer. Revenue and enterprise value figures as reported February 2025. Data current as of April 2026.
Howden's legal troubles, dramatic as they are, have an instructive predecessor. Alliant Insurance Services has been navigating poaching litigation for years - and represents perhaps the clearest example of a brokerage that has turned aggressive talent acquisition into a defining growth strategy, to the sustained fury of its competitors.
Over the course of 24 months prior to mid-2025, Alliant was sued multiple times by competitors including Aon, Marsh, JLT, USI, Alera Group and AssuredPartners for raiding employees and customers. Arthur J. Gallagher's lawsuit against Alliant described what it called an Alliant "playbook" – an alleged systematic approach of identifying targeted employees, learning their compensation and the size of their books of business, then offering "outsized compensation" to lure them across. Gallagher rejected Alliant's characterization of these moves as "add-on acquisitions," arguing that Gallagher, not the employees, owned the books of business being transferred.
In 2019, Lockton won an injunction against Alliant in Delaware Chancery Court, where a judge found that Alliant had "engineered" and "coordinated" a sweeping raid. Alliant subsequently redomiciled from Delaware to California - a move that Gallagher later accused it of making specifically to avoid the jurisdiction where it had previously lost.
Alliant's response to all of this has been, in effect, to keep growing. Whether the strategy crosses legal lines is a question being worked out across multiple courtrooms. That it has worked commercially is harder to dispute.
No firm better illustrates the complexity of this litigation landscape than Marsh. The world's largest insurance broker is simultaneously one of the most aggressive plaintiffs in talent disputes and one of the most significant professional liability defendants in the industry - a combination that is without close parallel among its peers.
On the plaintiff side, Marsh has filed multiple suits against Howden, Aon, and Alliant over the departures of key teams in its surety, construction, and Florida commercial lines practices. In April 2025, Marsh turned its attention to rival Aon, accusing it of leveraging insider knowledge from Robert McDonough, the former head of Marsh's surety practice, to orchestrate a near-instantaneous exodus of 20 employees. The complaint highlighted one revealing anecdote: Marsh had arranged an interview with an Aon candidate - unaware that McDonough had already joined Aon and disclosed the internal plans.
On the defendant side, the picture is more complicated and arguably more consequential. Marsh settled a $143 million lawsuit brought by White Oak Global Advisors in May 2025, arising from its role as insurance broker to the collapsed finance firm Greensill Capital. A related set of proceedings in the Federal Court of Australia - where claims against Marsh form part of more than AU$7 billion in Greensill-linked litigation - is scheduled for a five-month trial beginning August 2026, after Marsh's attempt to block those proceedings via the English courts was rejected.
And then there is the Tinder case: Match Group's new complaint in New York state court alleging that Marsh's failure to notify insurer Beazley of a claim before a policy expired cost the dating app nearly $4 million in uninsured losses and legal fees.
Read next: Tinder swipes left on Marsh
The breadth of Marsh's legal exposure - spanning trade secret disputes, professional liability, and multi-jurisdictional fraud allegations - makes it the most legally complex story in the industry right now.
Strip away the legal language and the competing allegations, and the underlying contest in most of these cases is remarkably straightforward: experienced producers are valuable, their client relationships are portable, and the non-solicitation agreements designed to protect both are of uncertain enforceability.
The economics of a successful talent raid are compelling. Roughly 95% of broker poaching suits settle before trial, with settlements typically ranging one to three times the revenue of the disputed business. For a firm building a national presence from scratch, the math can be attractive even accounting for litigation costs - particularly when the alternative is paying acquisition multiples for an established platform.
The regulatory environment has added another layer of uncertainty. The FTC's 2024 rule banning most non-compete agreements was struck down by a Texas federal court in August of that year, but the legal and political debate around worker mobility has not subsided. Employers are simultaneously trying to enforce non-solicitation agreements more aggressively while employees - and the firms recruiting them - are increasingly willing to test those agreements in court.
"When a start-up US broker conducts what appears to be a highly coordinated plan to lift entire teams from its competitors, taking information and customers in the process, it must be addressed," Brown & Brown's CEO said on an analysts' call in January 2026, without naming Howden directly.
For insurance professionals watching this play out, several implications are worth tracking.
The volume of litigation signals a market in genuine transition. Consolidation through M&A has been the dominant growth strategy in the brokerage sector for the better part of a decade. What 2025 demonstrated is that there is a faster, cheaper - and, for the targets, far more disruptive - alternative: build your book by walking into your competitor's offices and walking out with their people. The legal battles now underway will determine, over the next several years, how far that strategy can go before the courts call time.
The professional liability angle is distinct and should not be lost in the noise of the talent war stories. The Tinder case against Marsh, and the broader Greensill exposure, are reminders that brokerage litigation is not only about competitive dynamics. Clients sue brokers too - and when they do, the dollar amounts and the reputational stakes can be significant.
Finally, the sheer frequency of these cases has a market-wide effect. Every injunction obtained, every settlement reached, and every employee ordered to return a box of documents sends a message to the next firm considering a raid - and to the producers being asked to participate in one. The legal landscape is hardening in real time. How the industry adapts will be one of the defining stories of the next few years.
Sources: Insurance Journal, Bloomberg Law, Insurance Business, Business Insurance, Agency Checklists, court filings in SDNY, D. New Jersey, Massachusetts Superior Court, and the Federal Court of Australia. All litigation is ongoing unless otherwise stated. Howden, Alliant, and Marsh declined or did not respond to requests for comment on individual cases at the time of reporting.
