9. Mike Blum
Chief Technology Officer
KCG Holdings

For Mike Blum, joining KCG Holdings in January 2016 was a reunion of sorts. From 2009 through 2012 he had been head of Getco Execution Services, a key client-facing business of the high-tech Chicago trading firm Getco. In 2013 — as Blum was starting a roughly two-year stint as chief technology officer of hedge fund firm Teza Technologies — Getco acquired Knight Capital Group. Though he found "some Getco groups still intact" at what is now KCG Holdings, Blum says, the New York–based company "is different in a lot of ways," with a broader range of market making and trading services. KCG — a self-described "independent, pure-play, technology-driven intermediary in liquid financial instruments" — is in the process of moving all its operations onto a unified technology platform. That creates clean-slate opportunities for efficiencies and innovations that Blum finds exciting and says helped convince him to sign on.

Tapped initially as global head of client technology, Blum, 49, became CTO in October, succeeding Jonathan Ross (No. 4 last year), who left to pursue technology interests outside of trading and markets. With a BS in computer science from the University of Dayton, Blum started his career as a developer for electronic market making pioneer Automated Trading Desk. After serving as vice president of development at Island ECN, he made significant trading technology contributions at UBS, where he became a managing director of the investment bank. Blum notes that his subsequent business responsibilities at Getco, and then taking charge of "the whole technology stack" for the first time at Teza, prepared him for the changes and challenges presented by KCG. He has seen high frequency trading evolve in stages, from "conquering complexity" in market structure to maximizing speed. Although those advanced capabilities cannot be neglected, "the focus now is on alpha," Blum says. "Now it's about getting smarter."

The 2017 Trading Tech 40
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Bats Global Markets
Bloomberg Tradebook
CME Group
Intercontinental Exchange
KCG Holdings
Goldman Sachs Group
Fidelity Institutional
MarketAxess Holdings
NEX Optimisation
Tradeweb Markets
IEX Group
Hong Kong Exchanges and Clearing
Citadel Securities
Cinnober Financial Technology
Aquis Exchange
Mana Partners
S3 Partners
AQR Capital Management
Financial Industry Regulatory Authority
OTC Markets Group
Dash Financial
PDQ Enterprises
Vela Trading Technologies
OpenDoor Trading
LMAX Exchange
Monex Group