Spot Trading LLC’s chief investment officer, Carlos Saez, said he resigned from the Chicago-based company that uses computer-driven strategies to buy and sell options.

Saez was also a partner at Spot. Before joining the company in 2005 as director of trading, he was a floor specialist for TD Options LLC at the Chicago Board Options Exchange and worked at Stafford Trading, according to his LinkedIn profile.

“I recently resigned from Spot after almost 11 great years to recharge and plan the next phase of my career,” Saez said in an e-mail Monday. Ellen Resnick, a spokeswoman for Spot, declined to comment, citing the company’s policy of not speaking about personnel matters.

Spot, which trades stock options from its headquarters in Chicago’s financial district, is among a group of firms based in the city that have transformed markets by using cutting-edge technology to automate trading. The company’s chief executive officer, Stephen Brodsky, is the son of William Brodsky, a prominent member of the Chicago trading community who’s chairman of Chicago Board Options Exchange owner CBOE Holdings Inc.

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