Rule 611, tick sizes, prediction markets, and the first serious SEC-CFTC harmonization push in a generation — the regulatory calendar for 2027 is the most consequential in twenty years. For the first time at ELS, both regulators are on stage together.

• The SEC's proposed rescission of Rule 611: what a post-trade-through-protection market means for routing logic your desk has run for twenty years

• The CFTC's push for federal jurisdiction over prediction markets — what it means for event contract trading and how the regulatory contest plays out

• The SEC-CFTC harmonization initiative: the first serious coordination in a generation and what it actually covers

• The full 2027 rulemaking calendar: what's decided, what's still in motion, and where the industry's voice still carries weight