William Peterffy

Director/Board Member at INTERACTIVE BROKERS GROUP, INC.

Net worth: 880 658 $ as of 2026-05-30

36 year

Finance

Consumer Services

Profile

William Peterffy is the founder of One Small Planet LLC, founded in 2020, and holds the title of CEO.
Mr. Peterffy currently holds the positions of Director at Interactive Brokers Group, Inc. since 2020, Director at Interactive Brokers (U.K.) Ltd., and Trustee at Collective Heritage Institute.
Mr. Peterffy completed undergraduate education at the University of Colorado Boulder in 2013.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
INTERACTIVE BROKERS GROUP, INC. CLASS A 0%	2026-03-08	10,126 ( 0% )	880 658 $	2026-05-30

William Peterffy active positions

Companies	Position	Start
INTERACTIVE BROKERS GROUP, INC.	Director/Board Member	2020-04-22
Interactive Brokers (U.K.) Ltd. Interactive Brokers (U.K.) Ltd. Investment Banks/BrokersFinance Engages in buying and selling commodity contracts	Director/Board Member	-
Collective Heritage Institute	Director/Board Member	-

All active positions of William Peterffy

Training of William Peterffy

Experiences
Positions held

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Listed companies

Private companies

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Connections

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Members of the board

Executives

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Linked companies

Private companies	4
Interactive Brokers Group, Inc. Interactive Brokers Group, Inc. Investment Banks/BrokersFinance Operates as a holding company whose subsidiaries provide brokerage and investment services	Finance
Interactive Brokers (U.K.) Ltd. Interactive Brokers (U.K.) Ltd. Investment Banks/BrokersFinance Engages in buying and selling commodity contracts	Finance
University of Colorado Boulder University of Colorado Boulder Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
Collective Heritage Institute