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ATSs and Off-Exchange Trading - 
Opportunities and Challenges

A TabbFORUM Symposium

April 27, 2026

New York City

Speakers

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Rich Steiner

Managing Director,

Piper Sandler

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Matt Comstock

Partner,

Willkie Farr & Gallagher

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Roman Ginis

CEO, ImperativeExecution, Parent of IntelligentCross

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Sean Hoover

COO & Co-Founder,

PureStream

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Chuck Frederick

President,

TMX AlphaX US

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Jon Kroeper

Director, 

SEC

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Robert McNamee

VP & Associate General Counsel, FINRA

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Katie Kolchin

Head of Equity & Options Market Structure, SIFMA

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Larry Tabb

Director of Market Structure Research,

Bloomberg

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Matt Clarke

Head of Distribution & Liquidity Management, XTX Markets

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Jason Wallach

CEO,

Bruce Markets

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Andrew Blake

Partner,

Sidley Austin

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Bruce Morris

CEO,

TABB Group

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Joel Oswald

Principal,

Williams & Jensen

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Jeff Mendl

Head of Broker Dealer Sales, OTC Markets

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Alan Konevsky

CEO,

tZERO

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Kevin Tyrrell

Head of Markets,

NYSE

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Ellen Greene

Head of Business Development & Market Structure Strategy,

IMC Trading

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Cameron Smith

Global Head of Trading & Co-President, 

TXSE

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Enrico Cacciatore

Chief Product & Strategy Officer, Co-Founder, CalcGuard

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Kate McAllister

Sales & Client Relationships, Global Liquidity Partners

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James Dombach

Partner,

Davis Wright Tremaine

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Michael Warlan

Head of Global Trading,

Third Avenue Management

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Mark Gurliacci

SVP, Global Equity Trading,

AllianceBernstein

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Walt Lukken

President & CEO,

FIA

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Adrian Griffiths

Head of Market Structure,

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Brett Redfearn

President,

Securitize

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Brian Hyndman

President & CEO,

Blue Ocean Technologies

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Ari Burstein

General Counsel &

Chief Policy Officer,

IntelligentCross

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Armando Diaz

CEO,

PureStream

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Rich Lee

Managing Director,

Robert W. Baird & Co. 

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