{
  "slug": "form-13f",
  "name": "Form 13F",
  "jurisdiction": "US",
  "regulator": "SEC",
  "kind": "rule",
  "effective_date": "1979-01-01",
  "summary": "Quarterly public report of long equity positions held by institutional investment managers exercising discretion over $100M+ in 13(f)-eligible securities. The basis of widely-watched 'whale-watching' analysis of hedge funds.",
  "scope": "Institutional investment managers — including hedge funds — managing $100M+ in 13(f)-eligible securities.",
  "key_provisions": [
    {
      "section": "Reporting trigger",
      "summary": "Discretion over $100M+ in 13(f)-eligible securities at the end of any month in any calendar year."
    },
    {
      "section": "Filing deadline",
      "summary": "Within 45 days of calendar quarter-end (March 31 → May 15, etc.)."
    }
  ],
  "thresholds": [
    {
      "name": "13F filing trigger (eligible securities AUM)",
      "value": 100000000,
      "currency": "USD"
    }
  ],
  "applies_to": [
    "institutional investment managers"
  ],
  "filing_requirements": [
    {
      "form": "13F-HR",
      "frequency": "quarterly",
      "filer": "manager",
      "trigger": "$100M+ 13(f)-eligible AUM"
    }
  ],
  "related_terms": [
    "disclosure",
    "whale-watching",
    "13F-eligible-securities"
  ],
  "official_text_url": "https://www.sec.gov/divisions/investment/13ffaq.htm",
  "history": "Mandated by Section 13(f) of the Exchange Act (1975 amendment). Threshold has remained at $100M since inception despite multiple SEC proposals to raise it."
}