Sources report: "He has deep technical knowledge and understanding of the regulators, as well as an excellent sense of commercial practicalities." (2018)

An impressed client lauds: "He is an authentic guru of insurance regulatory issues." (2019)

Chambers USA


Larry Hamilton is co-lead of Mayer Brown's US Insurance Regulatory & Enforcement group. He advises insurance companies, insurance agencies and investment companies on a broad range of regulatory matters, including those associated with formation, licensing, portfolio investments, reinsurance, e-commerce, cybersecurity and outsourcing. He is also a member of Mayer Brown’s Cybersecurity & Data Privacy practice.

Larry has a 50-state insurance regulatory practice and has extensive experience negotiating directly with insurance regulators, helping clients overcome regulatory obstacles and gain approval for their proposed forms of business arrangements.  He advises clients in connection with corporate governance, mergers and acquisitions, reserve financings, insurance-linked securities, pension risk transfers and public and private offerings of securities.  Larry also advises on regulatory issues relating to the nonadmitted insurance market, and he is a member of the Surplus Lines Law Group and the Legislative Committee of the Wholesale & Specialty Insurance Association (WSIA).

Larry is also part of Mayer Brown’s Insurance and Capital Markets Convergence subgroup, which uses the combined talents of the firm’s insurance and structured finance practitioners to ensure that transactions take into account the customs and expectations of both markets. He regularly advises US and European financial institutions on the insurance regulatory issues associated with complex capital market and derivative structures, including techniques such as credit derivatives, “transformer” vehicles, collateral trusts and special purpose reinsurance companies.

Larry is ranked in Chambers USA (Illinois – Insurance: Transactional & Regulatory), which has described him as “great with the regulator and a very effective and good advocate for his client's cause.” He is also ranked for Insurance – Non-contentious in the Legal 500 and has been listed in Best Lawyers for insurance law and Illinois Super Lawyers for mergers and acquisitions since 2009 and 2010, respectively. Larry joined Mayer Brown in 1996.

Spoken Languages

  • English
Staying Ahead of the Curve: Cybersecurity and Data Privacy–Hot Topics for Global Businesses


  • Represented Everest Reinsurance Holdings, Inc. in the sale of Mt. McKinley Insurance Company to Clearwater Insurance Company, an affiliate of Fairfax Financial Holdings Limited.
  • Represented Assured Guaranty Ltd. in its $810 million acquisition of Radian Asset Assurance Inc., a US-based provider of financial guaranty insurance and reinsurance, from Radian Group Inc.
  • Represented Bristol-Myers Squibb in a $1.4 billion pension de-risking transaction with The Prudential.
  • Represented Wells Fargo Insurance in the sale of 42 of its regional insurance brokerage and consulting locations to USI Insurance Services.
  • Represented Desjardins Group, the leading cooperative financial group in Canada, as US regulatory counsel in the acquisition of State Farm’s Canadian insurance business.
  • Represented Everest Re Group, Ltd. In the launch of its $370 million sidecar, Mt. Logan Re, Ltd.
  • Represented SeaBright Holdings, Inc., a publicly traded workers’ compensation insurer, in its $252 million buyout by Bermuda-based run-off specialist, Enstar Group Limited.
  • Represented Assured Guaranty, Ltd. in the acquisition of Municipal and Infrastructure Assurance Corporation, a financial guaranty insurer.
  • Represented Home Warranty of America, as special insurance regulatory counsel, in its acquisition by Direct Energy Marketing Limited, a leading supplier of electricity, natural gas and related services in North America.
  • Represented Everest Reinsurance Holdings in the acquisition of Heartland Crop Insurance, Inc., a specialty underwriter of crop insurance.
  • Represented ACE American Insurance Company, a subsidiary of ACE Limited, in its $1.1 billion acquisition of the remaining 80% of Rain and Hail Insurance Service, Inc., the second largest crop insurance underwriter in the United States.
  • Represented Guggenheim Life & Annuity Company in its acquisition of $1.7 billion of policies and related assets from Standard Life Insurance Company of Indiana, as a part of Standard Life’s ongoing, court-supervised reorganization.
  • Represented Assured Guaranty Corp. in the acquisition of the US public finance business of CIFG Assurance North America, Inc.
  • Represented OneBeacon Insurance Group Ltd., a Boston-based, Bermuda-domiciled insurance holding company, on its agreement to sell its personal lines insurance business to Tower Group, Inc.
  • Represented Assured Guaranty, Ltd. in the $722 million acquisition of the financial guaranty insurance business of Financial Security Assurance Holdings Ltd.
  • Represented ACE Limited in the $2.4 billion purchase of Combined Insurance Company of America.
  • Represented UnitedHealth Group Incorporated in the sale of the $1.8 billion life and annuity business of its Golden Rule subsidiary to OneAmerica Financial Partners, Inc.
  • Represented Everest Re Group, Ltd. in connection with its migration to Bermuda and all of its subsequent public offerings of stock, debt and hybrid securities.
  • Represented CNA Financial Corporation in the sale of its personal lines business to Allstate, the sale of its individual life insurance business to Swiss Re, the sale of its group benefits business to Hartford Life and the sale of its third-party claims administration business to Cunningham Lindsey US Inc.
  • Represented Nestlé in the acquisition of Gerber Life Insurance Company from Novartis.
  • Represented Argo Group International Holdings Limited in the sale of its US reinsurance subsidiary, PXRE Reinsurance Company, to Tawa Group plc.
  • Advised GMAC on the 2008 restructuring of its insurance division and on the insurance regulatory aspects of the 2006 $14 billion sale of a 51 percent stake to a consortium led by Cerberus Capital Management.
  • Advised a major US life insurance company in creating a combination of corporate structures and service contracts for the performance of a variety of support services from India. This outsourcing project was one of the first of its kind and scale in the insurance industry.
  • Represented Endurance Specialty Insurance Ltd. in its formation and in the organization and development of its business structure and governance.
  • Represented LaSalle Re Limited in its business combination with Trenwick Group Inc. to form a new Bermuda-based company, Trenwick Group Ltd.
  • Advised American Farm Bureau Federation regarding the reconfiguration of the capital structure and governance of American Agricultural Insurance Company.
  • Advised major insurance broker clients regarding regulatory requirements and disclosure best practices relating to broker compensation.


The University of Chicago Law School, JD, with honors
Order of the Coif; Joseph Henry Beale Prize for legal research and writing

Harvard College, AB, summa cum laude
Phi Beta Kappa


  • Illinois


  • US District Court for the Northern District of Illinois


  • Visiting Committee to the University of Chicago Divinity School, 2012 to date
  • American Bar Association