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Use this page when you need Form 13F holdings in a product, screen, monitor, or AI agent. SEC API parses institutional manager filings and exposes structured holdings data through REST, SDKs, CLI, and hosted MCP while preserving the filing evidence you need to audit the result.

Evaluate this workflow

Test manager holdings, quarter comparisons, identifiers, and source trails.

13F monitor workflow

See the buyer-facing agent workflow.

Get an API key

Create an account and run the first holdings request.

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What to verify first

  • Manager identity: Confirm manager CIK, manager name, report period, filed date, and accession number.
  • Issuer identity: Verify CUSIP, issuer name, ticker, and any issuer CIK mapping your workflow depends on.
  • Change semantics: Decide how you will treat added, removed, increased, reduced, and unchanged positions across quarters.
  • Timing: 13F filings are quarterly and delayed. They are useful for ownership history and manager behavior, not real-time position proof.
  • Agent contract: Require the final answer to preserve source URL, request ID, filing date, report period, and caveats.

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Quick start

Get Berkshire Hathaway’s current 13F holdings: 
curl -H "x-api-key: $SECAPI_API_KEY" \
  "https://api.secapi.ai/v1/owners/13f?cik=0001067983&limit=10"

{
  "data": [
    {
      "issuer_name": "APPLE INC",
      "cusip": "037833100",
      "value": 84248000,
      "shares": 400000000,
      "share_type": "SH",
      "investment_discretion": "SOLE",
      "voting_authority_sole": 400000000
    }
  ],
  "period": "2024-Q4",
  "manager_name": "BERKSHIRE HATHAWAY INC",
  "filed_at": "2025-02-14"
}
Compare holdings across quarters: 
curl -H "x-api-key: $SECAPI_API_KEY" \
  "https://api.secapi.ai/v1/owners/13f/compare?cik=0001067983&period_a=2024-Q3&period_b=2024-Q4"

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Give this prompt to your agent

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Use cases

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Track position changes for top managers

Monitor when the largest hedge funds and asset managers add or exit positions. The compare endpoint surfaces exactly what changed.

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Build a 13F-based stock screener

Screen for stocks that are being accumulated by multiple institutional investors simultaneously. Cross-reference with insider buying for stronger conviction signals.

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Backtest institutional following

Analyze whether stocks with increasing institutional ownership outperform. Use historical 13F data to build and validate strategies.

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Give 13F data to an agent

Use 13F endpoints when your agent needs to answer questions like “which managers increased NVDA exposure last quarter?” or “which new positions appeared across multiple high-conviction funds?” Keep the manager CIK, reporting period, accession number, and request ID attached to the answer so the result can be audited.

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Compliance and reporting

Wealth managers and fund administrators can use 13F data to verify holdings disclosures and track competitive positioning.

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When SEC API is the right layer

Raw EDGAR is still the source of record. SEC API is the right layer when you want a normalized contract for managers, holdings, identifiers, source links, and agent-readable responses without maintaining your own 13F parser and quarter-comparison code.

13F monitor workflow

See how the ownership data becomes a recurring investor-agent workflow.

Ownership API page

Review the broader ownership surface: 13F, insiders, holders, and governance.

Pricing and limits

Check the meter and fanout posture before monitoring many managers.

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API endpoints

EndpointDescription
GET /v1/owners/13fList holdings for a 13F filer
GET /v1/owners/13f/compareCompare holdings between two quarters

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Get started

Get your API key

Start pulling 13F data with source trails and request metadata.