Scope

The Securities and Exchange Commission regulates US securities markets and the disclosure obligations of public companies. For finance leaders at SEC registrants, the SEC's reporting framework determines what gets filed, when, in what form, and with what level of detail beyond US GAAP. SEC requirements layer on top of FASB ASC — registrants must comply with both.

The framework has four main pieces:

Regulation S-K — non-financial disclosure requirements (MD&A, risk factors, executive compensation, etc.)
Regulation S-X — financial statement form and content requirements
Staff Accounting Bulletins (SABs) — SEC staff interpretive guidance on accounting matters
Compliance and Disclosure Interpretations (C&DIs) — SEC staff interpretive guidance on rules and forms

Filer categories

SEC reporting requirements scale by filer size:

Large Accelerated Filer (LAF) — public float ≥ $700M. Fastest filing deadlines (60 days for 10-K, 40 days for 10-Q). Subject to full SOX 404(b) auditor attestation.
Accelerated Filer (AF) — public float ≥ $75M but < $700M. 75 days for 10-K, 40 days for 10-Q. Subject to SOX 404(b).
Non-Accelerated Filer (NAF) — public float < $75M. 90 days for 10-K, 45 days for 10-Q. Subject only to SOX 404(a) management assessment, not 404(b) auditor attestation.
Smaller Reporting Company (SRC) — public float < $250M or revenue < $100M. Scaled disclosure relief under Regulation S-K Item 10(f).
Emerging Growth Company (EGC) — total annual gross revenues < $1.235B in most recent fiscal year, IPO within last 5 years, and not previously sold registered equity. Substantial scaled disclosure relief; exempt from SOX 404(b) for up to 5 years.

These categories drive the form of the filing, the disclosure requirements, and the audit obligations. A company near a threshold has to plan for the increased burden when it crosses.

Regulation S-K — non-financial disclosure

Regulation S-K is organized by Item number. The most heavily referenced:

Item 101 — Description of Business
Item 102 — Properties
Item 103 — Legal Proceedings
Item 105 — Risk Factors
Item 201 — Market for Registrant's Common Equity
Item 301 — Selected Financial Data (rescinded in 2021 for most filers)
Item 302 — Supplementary Financial Information
Item 303 — Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A) — heavily revised in 2021
Item 304 — Changes in and Disagreements with Accountants
Item 305 — Quantitative and Qualitative Disclosures About Market Risk
Item 308 — Internal Control Over Financial Reporting (the SOX 404 disclosure)
Item 402 — Executive Compensation (including the pay-versus-performance disclosure under Item 402(v))
Item 404 — Transactions with Related Persons, Promoters and Certain Control Persons
Item 406 — Code of Ethics
Item 407 — Corporate Governance (including audit committee disclosures)
Item 1500 series — Compensation Disclosure
Item 1503 — Mine Safety Disclosure

Regulation S-X — financial statement form

Regulation S-X dictates the form, content, and audit requirements of financial statements filed with the SEC. Key sections:

Rule 1-02 — Definitions of Terms Used in Regulation S-X
Rule 2-01 — Qualifications of Accountants (the SEC's auditor independence rules, more restrictive than AICPA Code)
Rule 2-02 — Accountants' Reports
Rule 3-01 through 3-04 — Period requirements for balance sheets, income statements, stockholders' equity, cash flows
Rule 3-05 — Financial Statements of Businesses Acquired or to Be Acquired (the "S-X 3-05 carve-out" rules that govern when target financials are required in an 8-K or registration statement)
Rule 3-09 — Separate Financial Statements of Subsidiaries Not Consolidated and 50 Percent or Less Owned Persons
Rule 3-10 — Financial Statements of Guarantors and Issuers of Guaranteed Securities Registered or Being Registered
Article 4 — Rules of General Application
Article 5 — Commercial and Industrial Companies (the schedules required for most non-specialized registrants)
Article 8 — Financial Statements of Smaller Reporting Companies
Article 10 — Interim Financial Statements (quarterly content requirements)
Article 11 — Pro Forma Financial Information

Staff Accounting Bulletins (SABs)

SABs are interpretive releases from SEC staff providing the staff's views on accounting and disclosure matters. They are not legally binding but registrants ignore them at their peril. Notable SABs:

SAB 99 — Materiality. The framework for assessing materiality of misstatements, including qualitative factors. The "rolling rebuttable presumption" framework that drives most materiality analysis in practice.
SAB 101 / SAB 104 — Revenue Recognition (largely superseded by ASC 606, but still relevant for legacy positions).
SAB 108 — Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements. The "dual method" approach (iron curtain and rollover) for assessing the impact of prior-period errors.
SAB 121 — Accounting for Obligations to Safeguard Crypto-Assets an Entity Holds for Platform Users. Rescinded January 2025.

Forms

The primary SEC filing forms:

Form 10-K — annual report
Form 10-Q — quarterly report
Form 8-K — current report (event-triggered)
Form 14A — proxy statement
Form S-1 / S-3 / S-4 / S-8 — registration statements
Form 20-F / 6-K / F-1 — foreign private issuers

Common pitfalls

Underestimating MD&A. Item 303 requires forward-looking analysis of trends, demands, commitments, and uncertainties, not just a historical reconciliation. The 2021 amendments to Item 303 raised the bar on quality of analysis. Boilerplate MD&A is a common SEC comment letter topic.
S-X 3-05 surprise. When a registrant acquires a significant business, S-X 3-05 may require separate financial statements of the target to be filed (in the 8-K or in a subsequent registration statement). The significance tests are mechanical but easily miscalculated. Surprise S-X 3-05 obligations have killed M&A timelines.
Independence violations. SEC Rule 2-01 is more restrictive than AICPA Code. A non-audit service that's permissible under AICPA may be prohibited for an SEC audit client. The auditor and audit committee bear ultimate responsibility but management's role in monitoring permitted services matters.
Non-GAAP disclosure. Regulation G and Item 10(e) of Regulation S-K govern non-GAAP measures. Equal or greater prominence to the most comparable GAAP measure, reconciliation, and a clear statement of why management uses the measure are required. Non-GAAP misuse is consistently in the SEC's Division of Enforcement priorities.

Comment letters

The SEC's Division of Corporation Finance reviews filings and issues comment letters when it has questions. The review and comment process is public — once a registrant's response is accepted, the entire comment letter exchange is published on EDGAR. Reviewing the comment letters issued to peer companies in the same industry is the single highest-ROI activity for SEC reporting professionals. It tells you exactly where the staff is focused right now.

Operator note

For finance leaders transitioning into SEC reporting from private-company experience, the practical step-change is disclosure depth and timing discipline. A 10-K MD&A is not a press release with more numbers — it's a forward-looking analytical document that has to support the financial statements without contradicting them. Allow 6–8 weeks for a first 10-K cycle if the team hasn't done one before. The Audit Committee's role becomes operationally central; it isn't a quarterly meeting topic, it's an ongoing relationship.

Access

SEC regulations are in the Code of Federal Regulations at Title 17, Chapter II, available at ecfr.gov. SABs and C&DIs are published at sec.gov. All registrant filings are searchable on EDGAR at sec.gov/edgar.

Related references

FASB ASC (the underlying accounting standards SEC reporting builds on)
PCAOB Auditing Standards (the audit framework for SEC registrants)
COSO Framework (the control framework for SOX 404)