Jonathan Kellner

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Jonathan Kellner
Jonathan Kellner.jpg
Occupation CEO
Employer MEMX
Location New York
LinkedIn Profile

Jonathan Kellner is the CEO of MEMX, a new start-up planning to file an application with the Securities and Exchange Commission in early 2019 for approval to operate as a national securities exchange.[1][2]

He became the first publicly announced employee of the exchange in February 2019.[3]

Kellner is the former CEO of Instinet, LLC. He was appointed CEO of Instinet March 6, 2014, replacing Fumiki Kondo, who was named head of Nomura Asset Management’s overseas client division in Tokyo. [4]

He was previously head of Instinet's Americas businesses.


Kellner joined Nomura Group in 2003 and moved to Instinet in 2007 following its acquisition of the company.[5]

Before that, Kellner held a variety of positions at Nomura, including managing director for US equity and global portfolio sales and trading. Kellner has also held senior trading and technology positions at Charles Schwab & Co, Investment Technology Group and Morgan Stanley.[6]


Kellner holds a bachelor of science degree in mechanical engineering from the University of Michigan.


  1. Jonathan Kellner Appointed as Chief Executive Officer of MEMX™. MEMX.
  2. Members Exchange appoints former Instinet head as CEO. Financial Times.
  3. Former Instinet CEO tapped to head new Wall Street-backed exchange. Reuters.
  4. Instinet appoints Jonathan Kellner CEO. press release via Finextra.
  5. Instinet Names Jonathan Kellner as CEO. Wall St. & Technology.
  6. Management of Instinet. Instinet.