The practical guide to EDGAR — which filings matter, what to look for, and how AI extracts signals from regulatory data.
SEC filings are the raw material of fundamental analysis. Every public company is required to disclose financial results, insider transactions, material events, and ownership changes. This data is free, structured, and — if you know where to look — full of trading signals that most retail investors ignore.
The challenge isn't access. It's volume. The SEC receives over 250,000 filings per year. Reading them manually is impossible at scale. This is where AI-powered analysis creates an edge.
| Filing | What It Is | Timing | Signal Value |
|---|---|---|---|
| Form 4 | Insider buy/sell transactions | Within 2 business days | Highest — real-time insider conviction |
| 13F-HR | Institutional holdings | Quarterly (45-day delay) | High — institutional positioning trends |
| 8-K | Material events | Within 4 business days | High — catalysts, leadership changes |
| 10-K | Annual financial report | 60-90 days after fiscal year | Medium — comprehensive but delayed |
| 10-Q | Quarterly financial report | 40-45 days after quarter | Medium — interim financial health |
| 13D | 5%+ activist ownership | Within 10 days of threshold | Very high — activist catalyst |
| S-1 | IPO registration | Before public offering | Low for trading — useful for context |
| DEF 14A | Proxy statement | Before annual meeting | Low-medium — executive compensation, governance |
Form 4 filings are the single most actionable SEC data source. When a corporate insider — CEO, CFO, director, or 10%+ owner — buys or sells stock, they must disclose within 2 business days.
See the Insider Buying Screener for current S&P 500 insider activity, or read the deep dive on insider trading data.
Quarterly reports from managers with $100M+ in assets. The 45-day delay means data is stale, but institutional positioning trends persist across quarters. Focus on:
8-K filings disclose events that shareholders need to know about promptly. These are often the most time-sensitive SEC filings:
| 8-K Item | Event Type | Signal Implication |
|---|---|---|
| 1.01 | Entry into material agreement | Potentially bullish — new business |
| 1.02 | Termination of material agreement | Potentially bearish — lost business |
| 2.01 | Completion of acquisition | Context-dependent |
| 2.02 | Results of operations (earnings) | Major catalyst — beat or miss |
| 4.01 | Change in auditor | Red flag — potential accounting issues |
| 4.02 | Non-reliance on prior financials | Strong red flag — restatement coming |
| 5.02 | Executive departure | Context-dependent — often bearish |
| 7.01 | Regulation FD disclosure | Forward-looking guidance |
Items 4.01 (auditor change) and 4.02 (non-reliance) are the strongest bearish signals in the 8-K universe. A company that changes auditors or says prior financials can't be relied upon is almost always headed for trouble.
Annual (10-K) and quarterly (10-Q) reports contain the full financial statements. Most investors focus on headline numbers, but the real signals are buried in:
Fin45's Sentinel system ingests SEC filings across all S&P 500 companies automatically:
SEC filing signals are Tier 1 in the confluence engine — the highest weight category. See Signal Accuracy for empirical win rates on SEC-derived signals.
Form 4 (insider buys/sells, filed within 2 days) and 8-K (material events) are the most time-sensitive. 13F filings (quarterly institutional holdings) reveal positioning trends. 10-K/10-Q provide deep financial analysis but are most delayed.
Yes. All filings are available for free on SEC EDGAR (sec.gov/edgar). You can search by company, ticker, CIK number, or filing type. EDGAR also provides RSS feeds and full-text search.
Form 4 (insider trades): 2 business days. 8-K (material events): 4 business days. 10-Q (quarterly report): 40-45 days after quarter end. 10-K (annual report): 60-90 days after fiscal year. 13F (institutional holdings): 45 days after quarter end. 13D (5%+ ownership): 10 days after crossing threshold.
A 10-K is the annual report with audited financial statements, comprehensive risk factors, and full business description. A 10-Q is the quarterly report with unaudited financials and abbreviated disclosures. 10-K is more thorough; 10-Q is more timely.