Leonard Schleifer

Chief Executive Officer at REGENERON PHARMACEUTICALS, INC.

Net worth: 1 863 M $ as of 31/12/2025

73 year

Consumer Services

Profile

Founder of Regeneron Pharmaceuticals, Inc., Leonard S. Schleifer is Co-President, Chief Executive Officer & Director at this company. He previously was Assistant Professor at Weill Cornell Medical College. Dr. Schleifer received a doctorate from the University of Virginia.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
REGENERON PHARMACEUTICALS, INC. 82.56%	15/04/2025	17,25,565 ( 82.56% )	1 332 M $	31/12/2025
REGENERON PHARMACEUTICALS, INC. 0.67%	31/12/2025	6,87,981 ( 0.67% )	531 M $	31/12/2025

Leonard Schleifer active positions

Companies	Position	Start
REGENERON PHARMACEUTICALS, INC.	Chief Executive Officer	08/01/1988
Regeneron Ireland DAC Regeneron Ireland DAC Operates as a biotechnology company which develops medicines for serious diseases	Chief Executive Officer	01/01/2013

All active positions of Leonard Schleifer

Former positions of Leonard Schleifer

Companies	Position	End
Weill Cornell Medical College Weill Cornell Medical College Other Consumer ServicesConsumer Services Functions as a College/University	Corporate Officer/Principal	-

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Training of Leonard Schleifer

Experiences
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Connections

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Linked companies

Private companies	5
Regeneron Pharmaceuticals, Inc. Regeneron Pharmaceuticals, Inc. Discovers, develops, manufactures and commercializes medicines for diseases
University of Virginia University of Virginia Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Cornell University Cornell University Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Weill Cornell Medical College Weill Cornell Medical College Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Regeneron Ireland DAC Regeneron Ireland DAC Operates as a biotechnology company which develops medicines for serious diseases