![Michael O'Halleran](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Michael O'Halleran
Director/Board Member at
RYAN SPECIALTY HOLDINGS, INC.
Net worth: 32 M $ as of 2026-02-27
Profile
Mr. Michael D.
O'Halleran is a Chair, Advisory Board at Manchesterstory Group LLC, a Member at The Commercial Club of Chicago and a Member at World Presidents' Organization.
He is on the Board of Directors at Ryan Specialty Holdings, Inc., Manchesterstory Group LLC, Dublin City University, Providence St. Mel School (Illinois), Ryan Specialty LLC, The American Ireland Fund, The Ireland Funds, Chicago Theatre Group, Inc. and University College Dublin.
Mr. O'Halleran was previously employed as an Independent Director by NuVasive, Inc., an Independent Director by CareFusion Corp., an Executive Chairman by Aon Re, Inc., a President & Chief Operating Officer by Aon Corp., a Principal by Aon Fac, Inc., a Senior Executive Vice President by Aon Global Ltd., a Principal by Employers Insurance Company of Wausau, a Principal by General Reinsurance Corp., an Executive Chairman by Geneva Re Ltd., and a Member by The Economic Club of Chicago (Illinois).
He also served on the board at Cardinal Health, Inc., Allegiance Corp., The Angus Robinson, Jr. Memorial Foundation, Inc. and World Business Chicago.
He received his undergraduate degree from the University of Wisconsin.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-03-01 | 815,158 ( 0.64% ) | 32 M $ | 2026-02-27 |
Michael O'Halleran active positions
| Companies | Position | Start |
|---|---|---|
| RYAN SPECIALTY HOLDINGS, INC. | Director/Board Member | 2021-07-20 |
The Ireland Funds
 The Ireland Funds Services to the Health IndustryHealth Services Operates as a global philanthropic network supporting peace, culture, education and community development | Director/Board Member | - |
Manchesterstory Group LLC
 Manchesterstory Group LLC Investment ManagersFinance Manchesterstory Group invests in companies located in the United States. The firm focuses on financial technology, insuretech and healthtech sectors. It provides capital for early, later and growth stage capital requirements. | Chairman | - |
The Commercial Club of Chicago
 The Commercial Club of Chicago Miscellaneous Commercial ServicesCommercial Services Operates as a membership organization | Corporate Officer/Principal | - |
The American Ireland Fund
 The American Ireland Fund Investment ManagersFinance Raises funds for the support programs of peace and reconciliation, arts and culture, education, and community development | Director/Board Member | - |
Ryan Specialty LLC
 Ryan Specialty LLC Insurance Brokers/ServicesFinance Operates as an insurance company that provides distribution, underwriting, product development, administration and risk management services | Director/Board Member | - |
Chicago Theatre Group, Inc.
 Chicago Theatre Group, Inc. Movies/EntertainmentConsumer Services Operates as a motion picture theatre | Director/Board Member | - |
Providence St. Mel School (Illinois)
 Providence St. Mel School (Illinois) Other Consumer ServicesConsumer Services Functions as a College/University | Director/Board Member | - |
World Presidents' Organization | Corporate Officer/Principal | 2011-07-20 |
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Former positions of Michael O'Halleran
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Training of Michael O'Halleran
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
76
1st degree connections
26
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 26 |
|---|---|
Aon Global Ltd. (United Kingdom)
 Aon Global Ltd. (United Kingdom) Insurance Brokers/ServicesFinance Provides insurance brokerage, risk management and human capital consulting services | Finance |
Cardinal Health, Inc.
 Cardinal Health, Inc. Medical DistributorsDistribution Services Distributes pharmaceuticals and engages in manufacturing & sale of medical, surgical and laboratory supplies | Distribution Services |
Allegiance Corp.
 Allegiance Corp. Medical DistributorsDistribution Services Distributes pharmaceuticals and medical supplies | Distribution Services |
NuVasive, Inc.
 NuVasive, Inc. Medical SpecialtiesHealth Technology Designs and develops medical devices for the surgical treatment of spine disorders | Health Technology |
General Reinsurance Corp.
 General Reinsurance Corp. Multi-Line InsuranceFinance Offers life and non-life insurance solutions | Finance |
CareFusion Corp.
 CareFusion Corp. Medical SpecialtiesHealth Technology Manufactures and distributes medical supplies | Health Technology |
Employers Insurance Company of Wausau
 Employers Insurance Company of Wausau Property/Casualty InsuranceFinance Provides property and casualty insurance services | Finance |
University of Wisconsin
 University of Wisconsin Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
University College Dublin
 University College Dublin Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
World Business Chicago
 World Business Chicago Miscellaneous Commercial ServicesCommercial Services Provides economic data and statistical assistance services | Commercial Services |
The Commercial Club of Chicago
The Commercial Club of Chicago Miscellaneous Commercial ServicesCommercial Services Operates as a membership organization | Commercial Services |
World Presidents' Organization | |
The Economic Club of Chicago (Illinois)
 The Economic Club of Chicago (Illinois) Miscellaneous Commercial ServicesCommercial Services Engages in fostering connections among leaders to encourage dialogue on important economic and social issues | Commercial Services |
The American Ireland Fund
The American Ireland Fund Investment ManagersFinance Raises funds for the support programs of peace and reconciliation, arts and culture, education, and community development | Finance |
Aon Re Global
 Aon Re Global Insurance Brokers/ServicesFinance Provides insurance services | Finance |
Chicago Theatre Group, Inc.
Chicago Theatre Group, Inc. Movies/EntertainmentConsumer Services Operates as a motion picture theatre | Consumer Services |
Providence St. Mel School (Illinois)
Providence St. Mel School (Illinois) Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Aon Re, Inc.
 Aon Re, Inc. Insurance Brokers/ServicesFinance Provides insurance brokerage and risk management services | Finance |
Dublin City University
 Dublin City University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Ryan Specialty LLC
Ryan Specialty LLC Insurance Brokers/ServicesFinance Operates as an insurance company that provides distribution, underwriting, product development, administration and risk management services | Finance |
The Angus Robinson, Jr. Memorial Foundation, Inc.
 The Angus Robinson, Jr. Memorial Foundation, Inc. Investment Trusts/Mutual FundsMiscellaneous Provides scholarship awards to qualified students who are enrolled in an insurance, risk management or actuarial science four-year degree program | Miscellaneous |
The Ireland Funds
The Ireland Funds Services to the Health IndustryHealth Services Operates as a global philanthropic network supporting peace, culture, education and community development | Health Services |
Aon Corp.
 Aon Corp. Insurance Brokers/ServicesFinance Provides insurance and risk management services | Finance |
Manchesterstory Group LLC
Manchesterstory Group LLC Investment ManagersFinance Manchesterstory Group invests in companies located in the United States. The firm focuses on financial technology, insuretech and healthtech sectors. It provides capital for early, later and growth stage capital requirements. | Finance |
Geneva Re Ltd.
 Geneva Re Ltd. Property/Casualty InsuranceFinance Provides reinsurance services | Finance |
Ryan Specialty Holdings, Inc.
 Ryan Specialty Holdings, Inc. Insurance Brokers/ServicesFinance Engages in the provision of insurance brokerage, distribution and underwriting services | Finance |
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