---
kind: "unit"
title: "17"
title_heading: "Commodity and Securities Exchanges"
key: "chII/part203"
level: "part"
label: "Part 203"
heading: "Rules Relating to Investigations"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/17/chII-part203"
sections_count: 8
---

# Part 203 — Rules Relating to Investigations

Title 17 C.F.R. — Commodity and Securities Exchanges › Chapter II — Securities and Exchange Commission

## Contents

- [Subpart A — In General](/cfr/17/chII-part203-subpartA.md)
- [Subpart B — Formal Investigative Proceedings](/cfr/17/chII-part203-subpartB.md)