Jonathan Kellner is the CEO of MEMX, the fastest-growing U.S. securities exchange. Launched on September 21, 2020, the venture is backed by a diverse group of market participants, including some of the industry’s largest broker-dealers, banks, and market makers. Kellner is responsible for MEMX’s strategic vision, with an initial focus on assembling the staff, establishing and maintaining a positive workplace culture, and guiding the company through the build-out of its technology platform and the exchange approval process with the U.S. Securities and Exchange Commission. Prior to accepting the role as MEMX CEO, Kellner spent 11 years at Instinet Incorporated — an institutional agency-only broker and independent equity trading arm of its parent company, Nomura Holdings, Inc. — most recently serving as CEO. He began his career in the financial services industry working in a variety of technology and equity trading roles at global financial services firms, including Charles Schwab and Morgan Stanley. He holds a Bachelor of Science degree in mechanical engineering from the University of Michigan.