Stuart Zimmer

Chief Executive Officer at ZIMMER ENERGY TRANSITION ACQUISITION CORP.

Net worth: 756 M $ as of 2026-05-30

58 year

Finance

Consumer Services

Profile

Stuart Jason Zimmer is Chief Executive Officer at Zimmer Partners LP.
Mr. Zimmer is Chairman & Chief Executive Officer at Zimmer Energy Transition Acquisition Corp.
since 2021.
Mr. Zimmer is Chairman at Ategrity Specialty Insurance Company Holdings since 2018.
Formerly, Mr. Zimmer was General Partner at Zimmer Lucas Partners LLC from 2000 to 2012.
Mr. Zimmer completed undergraduate studies at Harvard College.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
ATEGRITY SPECIALTY INSURANCE COMPANY HOLDINGS 80.65%	2026-04-15	38,765,770 ( 80.65% )	756 M $	2026-05-30

Stuart Zimmer active positions

Companies	Position	Start
ZIMMER ENERGY TRANSITION ACQUISITION CORP.	Chief Executive Officer	2021-01-31
ATEGRITY SPECIALTY INSURANCE COMPANY HOLDINGS	Chairman	-
Zimmer Partners LP Zimmer Partners LP Investment ManagersFinance Zimmer seeks to achieve the clients’ investment objectives primarily through individual security selection based on fundamental research and analysis. Their clients invest primarily in equity securities of electric and gas utilities, integrated utilities, water utilities, telecommunication companies, independent power producers and pipelines, exploration and production companies, oilfield services companies, renewable energy companies, and more broadly in energy and infrastructure-related industries.	Chief Executive Officer	-

All active positions of Stuart Zimmer

Former positions of Stuart Zimmer

Companies	Position	End
Zimmer Lucas Partners LLC Zimmer Lucas Partners LLC Investment ManagersFinance Zimmer invests primarily in the mid/large-cap utility sector. The firm maintains a high turnover rate.	Chief Investment Officer	2012-12-30

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Linked companies

Private companies	5
Zimmer Lucas Partners LLC Zimmer Lucas Partners LLC Investment ManagersFinance Zimmer invests primarily in the mid/large-cap utility sector. The firm maintains a high turnover rate.	Finance
Zimmer Partners LP Zimmer Partners LP Investment ManagersFinance Zimmer seeks to achieve the clients’ investment objectives primarily through individual security selection based on fundamental research and analysis. Their clients invest primarily in equity securities of electric and gas utilities, integrated utilities, water utilities, telecommunication companies, independent power producers and pipelines, exploration and production companies, oilfield services companies, renewable energy companies, and more broadly in energy and infrastructure-related industries.	Finance
Harvard College Harvard College Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Ategrity Specialty Holdings LLC Ategrity Specialty Holdings LLC Property/Casualty InsuranceFinance Provides property and casualty insurance services	Finance
Zimmer Energy Transition Acquisition Corp. Zimmer Energy Transition Acquisition Corp. Financial ConglomeratesFinance Operates as a blank check company	Finance