About a-team Marketing Services
The knowledge platform for the financial technology industry

A-Team Insight Briefs

Jonathan Kellner Named CEO of MEMX

Subscribe to our newsletter

Jonathan Kellner has joined Members Exchange (MEMX), a recently established member-owned equities exchange. Founding members include Bank of America Merrill Lynch, Charles Schwab, Citadel Securities, E*Trade, Fidelity Investments, Morgan Stanley, TD Ameritrade, UBS, and Virtu Financial. Before signing on to MEMX, Kellner led Instinet through the acquisition of BlockCross ATS from State Street, and the transition through regulatory change, including Dodd-Frank and MiFID II.

Subscribe to our newsletter

Related content

WEBINAR

Upcoming Webinar: From Monolith to Modular: Architecting Equity Trading Platforms for 24/5 and Beyond

Date: 14 October 2026 Time: 10:00am ET / 3:00pm London / 4:00pm CET Duration: 50 minutes Global equity markets are undergoing their biggest structural shift in decades. Extended and near-continuous trading, evolving market structures, and rapidly growing data volumes are placing unprecedented demands on trading infrastructure. In a recent TradingTech Summit New York poll from...

BLOG

TT Connects to Kalshi as the Institutional Case for Event Contracts Takes Shape

Trading Technologies has announced that it will support client execution on Kalshi, the largest US federally regulated prediction market, with trading expected to go live on the TT platform in the third quarter. It is the first regulated prediction market TT has connected to, and the firm frames it as the first of several regulated...

EVENT

RegTech Summit London

Now in its 10th year, RegTech Summit London will bring together the RegTech ecosystem to explore how the European capital markets financial industry can leverage technology to innovate the compliance function and response.

GUIDE

AI in Capital Markets Handbook 2026

AI adoption in capital markets has moved into a more disciplined phase. The priority is now controlled deployment: where AI can be used safely, where it can deliver measurable value, and how outputs can be governed, monitored and evidenced. The 2026 edition of the AI in Capital Markets Handbook examines how AI is being applied...