# 17 CFR § 201.121: Separation of functions

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-17-201.121

## Section

- **Citation:** 17 CFR § 201.121
- **Heading:** Separation of functions
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 17—Commodity and Securities Exchanges > CHAPTER II—SECURITIES AND EXCHANGE COMMISSION > PART 201—RULES OF PRACTICE > Subpart D—Rules of Practice > General Rules

## Text

Any Commission officer, employee or agent engaged in the performance of investigative or prosecutorial functions for the Commission in a proceeding as defined in § 201.101(a) may not, in that proceeding or one that is factually related, participate or advise in the decision, or in Commission review of the decision pursuant to Section 557 of the Administrative Procedure Act, 5 U.S.C. 557, except as a witness or counsel in the proceeding.

## Nearby sections

- [17 CFR § 201.100 § 201.100 Scope of the rules of practice.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.100.md)
- [17 CFR § 201.101 § 201.101 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.101.md)
- [17 CFR § 201.102 § 201.102 Appearance and practice before the Commission.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.102.md)
- [17 CFR § 201.103 § 201.103 Construction of rules.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.103.md)
- [17 CFR § 201.104 § 201.104 Business hours.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.104.md)
- [17 CFR § 201.110 § 201.110 Presiding officer.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.110.md)
- [17 CFR § 201.111 § 201.111 Hearing officer: Authority.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.111.md)
- [17 CFR § 201.112 § 201.112 Hearing officer: Disqualification and withdrawal.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.112.md)
- [17 CFR § 201.120 § 201.120 Ex parte communications.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.120.md)
- [17 CFR § 201.121 § 201.121 Separation of functions.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.121.md)
- [17 CFR § 201.140 § 201.140 Commission orders and decisions: Signature and availability.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.140.md)
- [17 CFR § 201.141 § 201.141 Orders and decisions: Service of orders instituting proceedings and other orders and decisions.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.141.md)
- [17 CFR § 201.150 § 201.150 Service of papers by parties.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.150.md)
- [17 CFR § 201.151 § 201.151 Filing of papers with the Commission: Procedure.](https://www.frixlaw.com/law-library/statutes/ecfr-17-201.151.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-17-201.121. Check the current official text before relying on it. Not legal advice.