Securities Exchange Act of 1934

The Securities Exchange Act of 1934 is the foundational US law governing the secondary securities market — the trading of already-issued stocks and bonds. It created the SEC, required public companies to disclose quarterly and annual financial statements, and outlawed insider trading and market manipulation. Together with the Securities Act of 1933, it forms the skeleton of US securities law.

Section 10(b) and Rule 10b-5: the anti-fraud core

The Act’s most important provision is Section 10(b), which prohibits “any manipulative or deceptive device or contrivance” in connection with the purchase or sale of securities. The SEC implemented this with Rule 10b-5, which makes it unlawful to: (1) employ any device, scheme, or artifice to defraud; (2) make any untrue statement of material fact or omit a material fact necessary to make a statement not misleading; or (3) engage in any act, practice, or course of business that operates as fraud.

Rule 10b-5 is the broadest anti-fraud rule in securities law. The SEC uses it to prosecute insider trading, false statements by company officers, and misrepresentation by brokers. Private investors can also sue under Rule 10b-5, claiming they were defrauded in a securities transaction. Implied in the rule is scienter — intent to defraud or recklessness — meaning that an honest mistake is not actionable.

Periodic reporting: 10-K, 10-Q, 8-K

Any company with more than $10 million in assets and more than 500 shareholders must register with the SEC and file periodic reports. The main reports are:

• Form 10-K: Annual report filed within 60–90 days of fiscal year-end, including audited financial statements, management discussion, risk factors, and executive compensation.
• Form 10-Q: Quarterly report filed within 40–45 days of quarter-end, including unaudited financial statements and updated MD&A.
• Form 8-K: Filed within four business days of material events (acquisition, executive departure, bankruptcy), giving markets real-time information.

These filings are the bedrock of US financial transparency. Investors, analysts, and competitors can access them from the SEC’s EDGAR database.

Insider trading: Sections 13 and 16

Section 16 requires that officers, directors, and large shareholders (those holding 5% or more) file forms disclosing their purchases and sales of the company’s securities. This public record allows investors to see what insiders are doing. If an insider buys, the stock often goes up (why would an insider buy a bad investment?); if they sell, the stock often falls.

The Act also imposes a “short-swing profit” rule under Section 16(b): if an insider buys and then sells (or sells and then buys) within six months, any profit is forfeited to the company. This is a strict-liability rule — the insider does not have to intend to profit on inside information; if they profited from any transaction in the window, they owe the profit back. The rule is meant to deter trading on inside information by making it unprofitable.

Stock exchanges and the SRO system

The Act brought stock exchanges and brokers under federal oversight. Exchanges must register with the SEC and comply with rules. The SEC also created the framework for self-regulatory organizations (SROs) — private bodies like FINRA that make rules, discipline members, and handle customer complaints. The SEC approves SRO rules and can override them if they do not serve the public interest.

Regulation FD (fair disclosure)

In 2000, the SEC adopted Regulation FD, which requires companies to disclose material information to all investors at the same time. Before FD, companies could brief select analysts or major shareholders before releasing information to the broader market, giving insiders an advantage. FD prohibited this — if a company discloses something material to one investor, it must disclose to all.

Modern challenges: dark pools and fragmented markets

The 1934 Act envisioned a small number of centralized exchanges. Today, exchanges have fragmented — trades execute on dozens of exchanges and dark pools (private trading venues). This has lowered trading costs and increased liquidity but has made market transparency harder. The SEC is constantly updating the Act’s implementing rules to address new trading technologies.

See also