Anthony Tassone

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Anthony Tassone
Anthony Tassone Photo copy.jpg
Occupation CEO and Co-Founder
Employer Green Key Technologies
Location Chicago
LinkedIn Profile

Anthony Tassone is co-founder and CEO of Green Key Technologies. He re-assumed the CEO post in 2019.[1]

Before that, he served as chief product officer at Green Key. He served as the company's CEO from 2013 to February 2016. As head of GreenKey, Tassone designed and oversaw the launch of The Block Pool, a click-entry platform designed specifically for over-the-counter brokers executing off-exchange transactions. Tassone also oversaw the design and development of "Trader Voice Box," a cloud-based "software turret" that replicates the functionality of legacy hardware turrets in a single software program.


Tassone is the inventor of the patent-pending "decline ratio" crossing algorithm, which is part of The Block Pool technology and helps eliminate no obligation quoting that plagues OTC indicative markets. The crossing algorithm sorts and ranks participants by how likely they are to accept the deal price they are currently quoting by referencing their historical decline ratio.

He is also the inventor of the patented "concurrent push-to-talk" features of the trader voice box software - allowing one user to communicate with dozens of other users concurrently.

Before joining GreenKey, Tassone was Director of Volatility Trading for Buttonwood Group Trading. He was also a vice president of Algorithmic Trading Solutions for RTS Realtime Systems Group in London and director of product development for the U.S. Futures Exchange.

Tassone started his career 1998 as a runner for Merrill Lynch on the Chicago Board of Trade grains floor, working his way up to become an agricultural options market maker for the Hanley Group in 2003.


Tassone holds a B.A. in Computer Science, Financial Modeling, from DePaul University and is the only student to ever be awarded a "Financial Modeling" distinction as an undergraduate. He also holds an A.S. in Business Administration from Kaplan University.

Tassone also holds Securities Licenses Series 3, 7, 30 and 63.