Among the stories we cover this month are:
• IEX landing its first corporate listing, Interactive Brokers Group
• Cboe contemplating a new speed bump for its EDGA exchange
• Big banks taking an ever-bigger chunk of closing-auction volume for themselves with OTC matching and principal-trading products
• A wave of regulatory and lobbying action heralds the scariest Halloween ever for market-structure debate, with major exchanges likely to face more tricks than treats
• Nasdaq hits back again at the SEC’s proposed Transaction Fee Pilot, with a strongly worded comment letter
• Another big broker finds itself paying a multimillion-dollar fine for alleged dark-pool violations
• How a ruling granting class-action status to an online-broker lawsuit could shake up the industry
• Traders heading back into European dark pools after the first 6-month bans under MiFID II expired
• How Wall Street may be losing a battle for artificial-intelligence talent with Silicon Valley giants
