> ## Documentation Index
> Fetch the complete documentation index at: https://docs.secapi.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# SEC Subsidiaries API — Exhibit 21 Extraction for Corporate Structures

> Access structured subsidiary data extracted from SEC Exhibit 21 filings via API. Map corporate hierarchies, jurisdictions, and ownership structures. Get started free at secapi.ai/signup.

Public companies disclose their subsidiary entities in Exhibit 21 of their 10-K filings. SEC API extracts and structures this data — subsidiary names, jurisdictions of incorporation, and ownership percentages — so you can map corporate hierarchies programmatically without parsing HTML tables.

## Capabilities

<CardGroup cols={2}>
  <Card title="Exhibit 21 extraction" icon="sitemap">
    Subsidiary names, jurisdictions, and ownership percentages parsed from Exhibit 21 across all SEC filers.
  </Card>

  <Card title="Corporate hierarchy mapping" icon="diagram-project">
    Trace parent-subsidiary relationships to understand the full corporate structure of any public company.
  </Card>

  <Card title="Jurisdiction data" icon="earth-americas">
    See where each subsidiary is incorporated — useful for tax structure analysis and regulatory mapping.
  </Card>

  <Card title="Historical tracking" icon="clock-rotate-left">
    Compare subsidiary lists across years to detect new entities, dissolved entities, and jurisdiction changes.
  </Card>
</CardGroup>

## Quick start

Get Apple's subsidiaries from the latest Exhibit 21:

```bash theme={null}
curl -H "x-api-key: $SECAPI_API_KEY" \
  "https://api.secapi.ai/v1/companies/subsidiaries?ticker=AAPL"
```

```json theme={null}
{
  "ticker": "AAPL",
  "company_name": "Apple Inc",
  "filing_date": "2024-11-01",
  "subsidiaries": [
    {
      "name": "Apple Operations International Limited",
      "jurisdiction": "Ireland",
      "ownership_pct": 100
    },
    {
      "name": "Apple Sales International Limited",
      "jurisdiction": "Ireland",
      "ownership_pct": 100
    },
    {
      "name": "Beats Electronics, LLC",
      "jurisdiction": "Delaware",
      "ownership_pct": 100
    }
  ],
  "total_subsidiaries": 42
}
```

## Use cases

### Tax structure analysis

Map offshore subsidiaries and holding company structures to understand corporate tax strategies and identify jurisdiction-specific risks.

### M\&A due diligence

Before an acquisition, pull the target's full subsidiary list to understand the scope of the corporate structure and potential liabilities.

### Sanctions and compliance screening

Cross-reference subsidiary names and jurisdictions against sanctions lists and restricted jurisdictions for AML/KYC workflows.

### Competitive intelligence

Track when competitors create new subsidiaries, which can signal expansion into new markets or product areas.

## API endpoints

| Endpoint                                 | Description                 |
| ---------------------------------------- | --------------------------- |
| `GET /v1/companies/subsidiaries`         | Subsidiaries for a company  |
| `GET /v1/companies/subsidiaries/history` | Historical subsidiary lists |

## Why SEC API for subsidiary data

| Feature               | SEC API         | Raw EDGAR        | Bureau van Dijk | Manual research |
| --------------------- | --------------- | ---------------- | --------------- | --------------- |
| Structured JSON API   | Yes             | No (HTML tables) | Yes             | N/A             |
| Automatic extraction  | Yes             | No               | Yes             | No              |
| Historical comparison | Yes             | Manual           | Yes             | Manual          |
| REST API access       | Yes             | No               | Partial         | No              |
| Coverage              | All 10-K filers | All 10-K filers  | Global          | Per-project     |
| Pricing               | Pay-as-you-go   | Free (raw)       | \$\$\$\$        | Labor cost      |

## Get started

<Card title="Get your API key" icon="key" href="/getting-started">
  Start mapping corporate structures in under 60 seconds. 150 free API calls (one-time).
</Card>

* [SEC EDGAR API](/seo/sec-edgar-api)
* [Company Search API](/seo/sec-company-search-api)
* [API Reference](/api-reference)