"The requests for proprietary code and algorithm parameters by the Financial Industry Regulatory Authority (FINRA), a Wall Street brokerage regulator, are part of investigations into suspicious market activity, said Tom Gira, executive vice president of FINRA's market regulation unit."
http://www.reuters.com/article/2011/09/01/us-financial-regulation-algos-idUSTRE7806J420110901
http://www.reuters.com/article/2011/09/01/us-financial-regulation-algos-idUSTRE7806J420110901