"Humans are up against formidable opponents across the industry. Take Virtu Financial Inc. Deploying sophisticated technology in the business, the company’s com

"Humans are up against formidable opponents across the industry. Take Virtu Financial Inc. Deploying sophisticated technology in the business, the company’s computers can trade more than 11,000 securities and other products on more than 225 trading platforms in 35 countries. Because automation is so deeply ingrained in its business, it had only about 150 employees last year -- generating more than $5 million per worker."