Ex-Two Sigma Quant Jian Wu Charged with Model Manipulation

A former math whiz at a big investment firm, Two Sigma, is accused of secretly changing the computer models that decide how money is invested.

He did this to make it look like the models were doing better than they were, so he could get a bigger bonus.

The government says he made millions this way.

The company says it lost money due to his actions, and has been penalized by regulators.

The man has denied responsibility and says he is being unfairly blamed, and he has left the company.