# 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 a US stock, showing holders above 5% with their names, types, and percent of class over a configurable lookback window.

## Facts

- Endpoint: GET https://api.marketintelligenceapi.com/api/v1/sec/ownership/:symbol?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-db103028
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XTy-TwwrWvtl4CjXr2-gv

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-db103028
```

Example prompt: Who are the activist and large passive holders of Coca-Cola right now? Pull the SEC 13D and 13G filings from the last 365 days so I can see anyone above 5% and whether they're active or passive.

## When to prefer this

Use this endpoint when you need authoritative SEC-sourced data on who owns more than 5% of a US-listed company, especially to identify activist investors (13D) versus passive large holders (13G). Prefer this over social sentiment or news-based ownership estimates when regulatory accuracy and filing provenance matter — e.g. before a trade, merger analysis, or activist risk assessment.

## Known failure modes

- 404 if the ticker symbol is not found or has no SEC filings (not charged)
- Invalid or non-US ticker returns an error
- Days parameter outside 1–1095 range is rejected
- No filings returned if no holders exceeded 5% in the lookback window

## How this service works

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

## Output

A JSON list of SEC Schedule 13D and 13G filers for the requested ticker, including each holder's name, holder type (e.g. activist hedge fund, institutional investor), percent of class held, filing type (13D or 13G), and filing date — covering all filers above 5% within the specified lookback period (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-db103028/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)