Alliant Insurance Services
Alliant Insurance Services is one of the largest privately held insurance brokerage and consulting firms in the United States, specializing in property & casualty, employee benefits, and specialty insurance programs.
Last updated October 30, 2026
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Overview
Alliant Insurance Services is a large American insurance brokerage and risk-management consulting firm headquartered in Irvine, California. It operates as a distributor of insurance products and services, placing property and casualty coverage, employee benefits programs, and specialized lines for a wide range of commercial clients, public entities, and affinity groups. Rather than underwriting risk itself, Alliant earns commissions and fees by advising clients and brokering policies with carriers. The firm is organized around specialized practice groups and regional offices, which lets it combine national scale with local market relationships. Its practice areas span commercial property and casualty, employee benefits, surety, construction, healthcare, energy, real estate, public entity, tribal, and specialty/affinity programs. Alliant also provides related consulting services such as claims advocacy, risk control, and benefits administration support. Alliant is privately held and structured as an employee-owned company, a characteristic it markets as a differentiator that aligns employee interests with client service. It has grown substantially through a long series of acquisitions of regional brokerages and specialty agencies, expanding its geographic footprint across the United States. The company is consistently ranked among the top U.S. insurance brokers. In the market, Alliant positions itself as a client-focused alternative to the largest publicly traded brokers, emphasizing specialized expertise, local decision-making, and an entrepreneurial culture. Its clients include middle-market and large commercial enterprises, public agencies, healthcare organizations, and affinity associations.
History
Alliant Insurance Services traces its roots to 1925 and has evolved into one of the largest insurance brokerage and consulting organizations in the United States. Over the decades it built a business around distributing commercial insurance and employee benefits products, acting as an intermediary between clients and insurance carriers rather than as a risk-bearing underwriter. A defining phase of Alliant's development has been consolidation-driven growth. The firm assembled a national platform by acquiring numerous regional brokerages, specialty agencies, and benefits consultancies across the United States, each bringing local market relationships and niche expertise. This roll-up strategy allowed Alliant to expand its geographic reach and deepen its practice-area capabilities in segments such as construction, healthcare, energy, real estate, public entities, and tribal organizations. Ownership structure has been central to Alliant's identity. The company is privately held and operates with an employee-ownership model, which it presents as a way to attract and retain producers and specialists and to keep decision-making close to clients. This private, employee-aligned structure is a key part of how Alliant differentiates itself from the largest publicly traded brokerage competitors. Through its growth, Alliant has become a prominent name in U.S. insurance distribution, consistently ranked among the country's leading commercial insurance brokers. Its model combines national resources — carrier relationships, analytics, and specialty expertise — with a network of regional offices that serve middle-market and large commercial clients, public agencies, healthcare organizations, and affinity associations.
- 1925
Alliant Insurance Services' origins date to 1925.
Growth through numerous acquisitions of regional brokerages and specialty agencies builds a national U.S. platform.
Establishes an employee-ownership model as a core differentiator.
Products and positioning
A large privately held, employee-owned insurance brokerage positioned as a specialized, client-focused alternative to the biggest publicly traded brokers.
Commercial property and casualty brokerage
Employee benefits consulting and brokerage
Surety bonds
Specialty and affinity insurance programs
Risk management and claims advocacy
Controversies
2026
HUB International sues Alliant Insurance Services over alleged client solicitation
HUB International Midwest filed a complaint on August 11, 2026, in federal court in Fort Myers, Florida, against a former senior producer and competitor Alliant Insurance Services. The complaint alleges breach of a non-solicitation agreement and tortious interference after three accounts moved to Alliant. The allegations are untested, and no court has ruled on the merits.
Recent events
- Unconfirmed
Alliant Insurance Services agrees to acquire Nava Benefits[4]
Reported:
Alliant Insurance Services has agreed to acquire Nava Benefits, a New York-based employee benefits broker founded in 2019 that built a proprietary technology platform called HQ. Terms were not disclosed; Barclays served as financial advisor to Nava.
HUB International sues Alliant Insurance Services over alleged client solicitation[2]
Reported:
HUB International Midwest filed a complaint on August 11, 2026, in federal court in Fort Myers, Florida, against a former senior producer and competitor Alliant Insurance Services, alleging breach of a non-solicitation agreement and tortious interference after three accounts moved to Alliant. The allegations are untested and no court has ruled on the merits.
- Unconfirmed
WTW sues Alliant over alleged staff poaching[3]
Reported:
Willis Towers Watson sued Alliant Insurance Services, alleging that Alliant orchestrated a coordinated effort to recruit employees from WTW’s public entities team. The allegations are reported claims, not a court determination.
- Unconfirmed
Alliant launches a new trade credit unit[5]
Reported:
As part of the acquisition, a new trade credit unit was launched within Alliant Specialty.
- Unconfirmed
Alliant acquires One Source Risk Management[5]
Reported:
Alliant Insurance Services acquired One Source Risk Management, a North American-based insurance broker with offices in the US and Canada.
Alliant Insurance Services acquired Buck & Affiliates[6]
Reported:
Alliant Insurance Services acquired Spokane insurance agency Buck & Affiliates. Buck & Affiliates will retain its name and continue serving clients from its local headquarters.
Sources6 sources
- 1Alliant Insurance Services official websitealliant.com
- 2HUB International sues Alliant Insurance Services over alleged client solicitationinsurancebusinessmag.com
- 3HUB International sues Alliant Insurance Services over alleged client solicitationglobalreinsurance.com
- 4Alliant Insurance Services 同意收购 Nava Benefitsinsurancebusinessmag.com
- 5Alliant推出新的贸易信贷部门gtreview.com
- 6Alliant Insurance Services收购Buck & Affiliatesspokesman.com
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