Browse Regulation

Trading and Market-Conduct Rules

Securities-market rule terms for fair disclosure, short-sale regulation, margin regulation, anti-fraud liability, and resale exemptions.

Trading and Market-Conduct Rules is the regulation landing page for SEC disclosure, short-sale rules, margin-credit rules, fund distribution fees, issuer repurchase rules, and trading conduct rules. It keeps related terms in one branch so readers can move from a broad compliance question to the article that owns the regulatory evidence.

Use this page when a securities-market rule changes disclosure, trading, margin, issuer activity, or distribution practices. Use the parent Securities Market Rules and Disclosure page when you need the broader regulation map. For an individual decision, confirm the rule source, jurisdiction, covered party, effective date, filing or record, and compliance consequence before relying on the term.

Use the table below to move from this landing page into the term page that best matches the regulatory evidence.

Key Terms in This Branch

TermUse it for
Regulation FDRegulation FD is a securities-market rule or disclosure term used to place the narrower article in the right rule, regulator, jurisdiction, and compliance context.
Regulation SHORegulation SHO is a securities-market rule or disclosure term used to place the narrower article in the right rule, regulator, jurisdiction, and compliance context.
Regulation TRegulation T is a securities-market rule or disclosure term used to place the narrower article in the right rule, regulator, jurisdiction, and compliance context.
Rule 10b-5Rule 10b-5 is a securities-market rule or disclosure term used to place the narrower article in the right rule, regulator, jurisdiction, and compliance context.
Rule 144Rule 144 identifies a securities-law statute, registration test, exemption, resale rule, or reform framework.
Rule 144ARule 144A identifies a securities-law statute, registration test, exemption, resale rule, or reform framework.

Example in Use

An issuer repurchase rule may permit buybacks only when timing, volume, price, and manner conditions are met.

What to Check

  • SEC or market rule, covered security, covered firm, transaction type, disclosure item, and effective date.
  • Trading record, margin account, short-sale locate, issuer repurchase condition, fund distribution fee, and insider plan.
  • Exemption, safe harbor, reporting threshold, venue rule, and enforcement history.
  • Effect on market conduct, investor protection, financing, distribution cost, and compliance exposure.

Common Mistakes

  • Assuming a rule number alone explains permitted conduct.
  • Ignoring safe-harbor conditions and recordkeeping.
  • Mixing issuer rules, fund rules, broker rules, and trader rules without separating the covered party.

Market Conduct Rules content is educational and does not provide personalized legal, tax, accounting, compliance, regulatory, investment, or securities advice.

In this section

Choose a subsection first. Deeper term pages live inside each subsection, which keeps large topic hubs readable.

Regulation FD

Regulation FD, or Fair Disclosure, is a rule enacted by the U.S. Securities and Exchange Commission to curb selective disclosure by public companies.

Regulation SHO

Regulation SHO is the SEC short-sale rule framework covering order marking, price-test, locate, and close-out requirements for equity short sales.

Regulation T

Regulation T sets Federal Reserve margin rules for credit extended by brokers and dealers to securities customers.

Rule 10b-5

Rule 10b-5 is an SEC antifraud rule prohibiting deceptive conduct, misstatements, or omissions in securities transactions.

Rule 144

Rule 144 provides a U.S. resale framework for restricted and control securities when specified holding, volume, and disclosure conditions are met.

Rule 144A

Rule 144A provides a resale safe harbor for certain privately placed securities sold to qualified institutional buyers.

Revised on Sunday, June 21, 2026