# ZwillGen

**Type:** Law firm  
**Focus:** Gaming law, internet law, prediction market regulation  
**Significance:** Leading legal analysis source for prediction market regulatory proceedings; publications cited in practitioner circles and regulatory proceedings

## Overview

ZwillGen is a law firm specializing in gaming and internet law. Their analysis of prediction market regulation, particularly the Kalshi litigation across multiple jurisdictions, provides the most analytically rigorous practitioner framework for understanding federal preemption dynamics and forum selection implications.

## Key Analytical Frameworks

### Timing, Forum, and Federal Preemption Framework

ZwillGen's analysis of the Massachusetts Kalshi case identifies three critical dimensions:

1. **Structural venue bias:** State courts deciding whether their own AG's enforcement is preempted creates institutional bias toward narrower federal preemption interpretation
2. **Procedural posture:** Superior Court already ruled against Kalshi on full briefing — the SJC is an appeal from a loss, not a win
3. **Preemption scope:** Kalshi argues partial preemption (sports event contracts) not broad field preemption, which is harder to win under "clear Congressional intent" standard

## Timeline

- **2026-05-04** — Published post-oral-argument analysis of Massachusetts SJC Kalshi case, identifying Justice Kafker's "swimming upstream" comment and judicial skepticism toward federal preemption claims as key signals