# Market Intelligence API – SEC 13D/13G Ownership Filings

> Market Intelligence API – SEC 13D/13G Ownership Filings is a paid API for AI agents from api.marketintelligenceapi.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Returns SEC Schedule 13D (activist) and 13G (passive) filings for holders above 5% of a US stock, including holder names, types, and percent of class over a specified lookback period.

## Facts

- Endpoint: GET https://api.marketintelligenceapi.com/api/v1/sec/ownership/AAPL?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/market-intelligence-api-sec-13d-13g-ownership-filings-f1c0de1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ulCtLLMGIf4Gbit6z0RbO

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability market-intelligence-api-sec-13d-13g-ownership-filings-f1c0de1f
```

Example prompt: Who are the activist and large passive shareholders of NVDA? Pull their SEC 13D and 13G filings from the last 365 days so I can see each holder's name, type, and percent of shares held.

## When to prefer this

Use this endpoint when you need to identify activist investors (13D filers) or large passive institutional holders (13G filers) of a specific US-listed equity above the 5% SEC disclosure threshold. Prefer this over general news or web search when you need structured, SEC-sourced ownership data with holder names, types, and exact percentages. Ideal for due diligence, merger/acquisition research, activist campaign monitoring, or pre-trade institutional ownership checks.

## Known failure modes

- Invalid or unrecognized ticker symbol returns an error or empty result
- Lookback period outside 1–1095 days range may return an error
- Non-US or OTC stocks may return no filings
- Payment failure via x402 protocol results in 402 response and no data
- No filings in the requested time window returns an empty list

## How this service works

Use to find activist and large holders of a US stock. Returns SEC Schedule 13D (activist) and 13G (passive) filings of holders above 5% over days=1-1095, with holder names, type and percent of class.

## Output

A structured list of SEC Schedule 13D and 13G filers holding more than 5% of the specified US stock, with each record including the holder's name, holder type (e.g. hedge fund, institution, individual), filing type (activist 13D or passive 13G), and their percent of class, filtered to the requested lookback window (1–1095 days).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "symbol"
     ],
     "properties": {
      "symbol": {
       "type": "string",
       "examples": [
        "AAPL"
       ],
       "description": "Any US ticker with SEC filings (about 10,000, e.g. AAPL, KO, JPM), not only the example. Unknown: 404, not charged."
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "days": {
       "type": "integer",
       "default": 365,
       "maximum": 1095,
       "minimum": 1,
       "description": "Look-back period in days"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "description": "Example JSON response returned by this endpoint"
    }
   },
   "additionalProperties": true
  }
 },
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/market-intelligence-api-sec-13d-13g-ownership-filings-f1c0de1f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.marketintelligenceapi.com](https://www.zero.xyz/host/api.marketintelligenceapi.com/llms.txt)