The Financial Industry Regulatory Authority (FINRA) just announced it fined Goldman Sachs Execution & Clearing, a division of Goldman Sachs, $800,000 for failing to have policies and procedures to ensure certain clients received the best possible prices when trading in its SIGMA-X dark pool. FINRA specifically noted that in an eight-day trading period from July 29, 2011 to August 9, 2011 there were more than 395,000 transactions executed in SIGMA-X that violated the "trade-through" rule, which requires brokers execute trades at the best possible prices, regardless of what exchange it is on. The rule requires if ... (full story)