# SEC (Securities and Exchange Commission)

> The US federal agency that regulates securities markets, enforces securities laws and oversees the disclosures public companies must file.

Source: https://www.quantisnow.com/glossary/sec
Topic: Glossary / Market structure
Also known as: Securities and Exchange Commission, US SEC
Last updated: 2026-10-27

The SEC (Securities and Exchange Commission) is the US federal agency that regulates the securities markets, writes and enforces the rules that govern public companies, exchanges, brokers and investment advisers, and runs the EDGAR system where public filings are published. It was created by the Securities Exchange Act of 1934.

## How it works

The SEC is led by five commissioners appointed by the President and confirmed by the Senate, with no more than three from the same political party. Its work is split across divisions, the most visible to investors being:

- **Corporation Finance**, which reviews registration statements and periodic reports such as the [Form 10-K](https://www.quantisnow.com/glossary/form-10-k) and 10-Q.
- **Enforcement**, which investigates fraud, insider trading and disclosure violations and brings civil cases.
- **Trading and Markets**, which oversees exchanges, broker-dealers, clearing agencies and self-regulatory organizations like [FINRA](https://www.quantisnow.com/glossary/finra).

Companies file disclosures through [EDGAR](https://www.quantisnow.com/glossary/edgar), where they become public immediately, often before any press coverage.

## Why it matters for traders

Most hard catalysts arrive as SEC filings: current reports on [Form 8-K](https://www.quantisnow.com/glossary/form-8-k), insider trades on Form 4, activist stakes on Schedule 13D, offering documents and proxy fights. Reading the filing itself, rather than a summary, is the fastest way to know what actually happened.

SEC actions can also move stocks directly. A trading suspension, a Wells notice disclosed by a company, or an enforcement complaint naming executives can hit a stock hard. Note that the SEC does not approve or endorse any investment; a registration statement being declared effective only means the disclosure requirements were met.

## FAQ

### Does the SEC approve stocks or IPOs?

No. The SEC reviews disclosure documents for completeness, not investment merit. An effective registration means the company may sell shares, not that the shares are a good investment.

### Can the SEC halt trading in a stock?

Yes. Under Section 12(k) of the Exchange Act the SEC can suspend trading in a security for up to 10 business days, usually when there are questions about the accuracy of public information.

## Related terms

- [EDGAR](https://www.quantisnow.com/glossary/edgar.md): The SEC's electronic system where public companies, insiders and funds submit filings and where anyone can read them for free.
- [FINRA](https://www.quantisnow.com/glossary/finra.md): The self-regulatory organization that oversees US broker-dealers, licenses their representatives and collects short interest and off-exchange trade data.
- [Form 8-K](https://www.quantisnow.com/glossary/form-8-k.md): The SEC "current report" a public company files to disclose material events, generally within four business days of the event.
- [Form 10-K](https://www.quantisnow.com/glossary/form-10-k.md): The audited annual report US public companies file with the SEC, covering the business, risk factors, MD&A and full financial statements.
- [Regulation FD](https://www.quantisnow.com/glossary/regulation-fd.md): The SEC rule that bars public companies from selectively disclosing material nonpublic information to analysts or investors before the public.
- [Form 4](https://www.quantisnow.com/glossary/form-4.md): The SEC filing that reports a change in an insider's holdings, such as a purchase, sale, option exercise or grant, generally within two business days.

## On Quantisnow

- [How to read SEC filings](https://www.quantisnow.com/guides/how-to-read-sec-filings)
- [Live feed: SEC Filings](https://www.quantisnow.com/news/sec)
- [Latest SEC filings](https://www.quantisnow.com/top/sec-filings)