Why you can trust us

Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products.

Robot stock traders lose $440,000,000 in 45 minutes, need someone to spell it out

Humans never learn and apparently neither do robots. Autonomous trading AIs went on a spending spree at Knight Capital Group in New Jersey this week, buying up shares in everything from RadioShack to Ford and American Airlines (ouch) in a 45-minute frenzy of disobedience. The company tried to offload the unwanted stock, but discovered it was already nearly half a billion dollars in the red -- enough to wipe out its entire profit from 2011 and "severely impact" its ability to conduct business. If only it had protected itself with one of these.