Scott Johnston is a Chicago-based technology and trading executive who is head of operations management at Hudson River Trading. He joined the company in that role in 2021. Before that, he most recently was the chief administrative officer for the hedge fund Citadel.
Before that he was a managing director and CIO with the Chicago Mercantile Exchange from April 2000 to May 2004). As managing director and CIO of the CME, Johnston oversaw the exchange's critical technology development and computer systems, including electronic trading systems, enterprise computing, regulatory and clearing systems, systems architecture, trading floor systems development and customer support. Johnston was hired at the CME by CEO James McNulty who elevated the CIO position to one of nine managing directors who reported directly to him. McNulty had previously worked with Johnston at O'Connor and Associates, where Johnston at one time had been a floor trader at the CME.
During Johnston's tenure as CIO of the CME, their electronic trading platform (Globex) was upgraded and rebuilt, improving the speed and reliability of the platform. He is credited with leading the technology effort that led to increased volume on Globex, which led to improved profitability at the exchange. Also while he was at the CME, the EAGLE (Electronic Arbitrage Globex Liquidity Enhancer) Eurodollar trading platform was developed and introduced, allowing electronic trading of Eurodollar calender spreads to be traded without legging risk.
Additionally, during this time, Globex was modified to handle the routing of single stock futures orders to OneChicago through a special API connected to CBOEDirect. Also, in 2004 Johnston was CIO of the CME when it moved the clearing of trades for the Chicago Board of Trade from the Clearing Corp to CME Clearing.
Johnston received a BGS degree from the University of Michigan.
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