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Alliant Insurance Services
Founded in 1925, Alliant Insurance Services began as a small regional brokerage in California before Tom Corbett and a group of investors acquired it in...
Alliant Insurance Services
Founded in 1925, Alliant Insurance Services began as a small regional brokerage in California before Tom Corbett and a group of investors acquired it in 1998. The firm shifted to an aggressive consolidation model, acquiring agencies across specialty lines. Alliant now operates as a privately held, diversified insurance and consulting firm serving more than 100,000 clients nationwide, with offices in major US metros and a growing London presence. Alliant places over $40 billion in premiums each year across property and casualty, employee benefits, and specialty lines including construction, energy, marine, and entertainment. The firm acts as a broker and consultant rather than an underwriter, generating fee and commission income from placements. Its private credit and real estate investment arms — Alliant Capital and Alliant Real Estate — operate as distinct affiliates, originating and servicing commercial real estate loans and affordable housing tax credit investments. The firm has confirmed relationships with carriers such as AIG, Chubb, and Zurich (per public record). The firm employs approximately 12,000 professionals across more than 200 offices. In addition to its core insurance operations, Alliant maintains affiliated entities including Alliant Employee Benefits, Alliant Specialty, and Alliant Public Entity. In May 2024, the firm announced the acquisition of PBC Insurance, an Australian brokerage, marking its expansion into the Asia-Pacific market (per the firm's official communications, May 2024). Alliant's structural differentiator is its private ownership architecture — Corbett and the management team control the firm, freeing it from quarterly earnings pressure that shapes publicly traded peers like Marsh McLennan and Aon. This structure supports a long-duration acquisition strategy that has averaged roughly 30 deals annually for two decades, funded partly through private credit facilities that are themselves a product line Alliant helps place for clients.
General information
Firm type
Insurance
Year founded
1925
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Irvine
Corporate office
Irvine, CA, United States
Additional offices
New York, NY · Chicago, IL · San Francisco, CA · London, UK
Principals
Tom Corbett
Chairman and CEO
Peter Arkley
President, Alliant Specialty
Sector focus
Frequently asked questions
Who runs investment decisions at Alliant Insurance Services?
Tom Corbett, Chairman and CEO, oversees Alliant's strategic direction including its M&A program and affiliate investment arms. Peter Arkley, President of Alliant Specialty, manages key specialty practices. The firm's private credit and real estate affiliates — Alliant Capital and Alliant Real Estate — operate with dedicated management teams under Corbett's oversight.
How is Alliant structured compared to publicly traded insurance brokers?
Alliant is privately held, with Tom Corbett and management controlling the firm. This contrasts with publicly traded peers such as Marsh McLennan, Aon, and Willis Towers Watson, which face quarterly earnings pressure. The private structure enables Alliant's long-duration acquisition strategy, averaging roughly 30 deals annually since 1998, funded partly through private credit facilities.
Does Alliant operate investment vehicles beyond insurance brokerage?
Yes. Alliant Capital operates as a private credit affiliate that originates and services commercial real estate loans and affordable housing tax credit investments. Alliant Real Estate functions as a distinct investment arm. These affiliates generate fee income and investment returns separate from the core insurance brokerage commissions.
What is Alliant's known posture on co-investments alongside external GPs?
Alliant does not publicly market co-investment opportunities to external GPs. Its investment affiliates — Alliant Capital and Alliant Real Estate — originate and manage their own deal flow rather than participating as limited partners in third-party funds. The firm's capital is internally generated from brokerage profits and private credit lines.
How does Alliant source its acquisition targets?
Alliant sources acquisitions through a dedicated corporate development team and long-standing relationships in the insurance brokerage industry. The firm targets specialty agencies with strong regional or vertical market positions. It has completed over 500 acquisitions since 1998, integrating acquired firms while often retaining their existing management and client relationships.
Which sectors does Alliant explicitly avoid?
Alliant does not operate as an underwriter or insurance carrier — it avoids taking insurance risk on its own balance sheet. The firm functions strictly as a broker and consultant, placing risk with third-party carriers. Its private credit affiliate avoids unsecured consumer lending, focusing on real estate-backed and tax credit investments.
Where does Alliant's acquisition capital come from?
Alliant funds its acquisitions through internally generated cash flow from brokerage operations and private credit facilities. The firm does not disclose specific lenders, but its private credit affiliate's expertise in placing similar facilities for clients suggests close relationships with institutional credit providers. No public equity or external private equity sponsor is involved in the ownership structure.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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