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AnswerPool 13F Holders
x402
AnswerPool 13F Holders is a paid API for AI agents from answerpool.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Lists institutional holders of a specific issuer from the latest 13F filing period, ranked by position size, with manager name, value, shares, and put/call details.
Price / call$0.02
Success—
StatusUnknown
How this service works
AnswerPool turns SEC EDGAR, the Federal Register, USAspending, NIH, BLS and OpenAlex into structured JSON answers that AI agents and developers fetch in one call. 69 endpoints free, no account; derived analyses $0.02–$0.05 per call by card credits or USDC (x402). MCP server, full provenance.
Output
Returns a JSON object with the filing period date, an as-of timestamp, total holder count, a list of historical periods held, and an array of holder rows each containing manager CIK, manager name, USD value, share count, put/call indicator, issuer name, CUSIP, and accession number — sorted by position size descending.
Example use cases
Institutional ownership snapshot for earnings research
“Who are the top institutional holders of Tesla right now according to the latest 13F filings? Show me their names, share counts, and position values ranked by size.”
Options positioning by hedge funds
“Which institutional managers reported put or call positions on Apple in the most recent 13F period? I want to see the full list with values and share counts.”
CUSIP-based ownership lookup for a specific share class
“Look up all 13F filers who reported holding the CUSIP 67066G104 in the latest filing period and show me the manager names, number of shares, and USD values ranked from largest to smallest.”
Technical details
Endpoint
GEThttps://answerpool.io/v1/sec/13f/holdersWhen to prefer
Use this endpoint when you need a ranked list of institutional holders for a specific issuer (by name or CUSIP) from the most recent 13F reporting period. Prefer this over the 13F Manager Holdings endpoint when you know the issuer and want to see all managers holding it, rather than starting from a specific manager's portfolio. Best suited for ownership concentration analysis, due diligence on a stock's institutional base, or tracking which funds have options positions on a given security.
Side effects
- Issuer name not found if prefix doesn't match as-filed name exactly (e.g. 'Nvidia' vs 'NVIDIA CORP')
- No identifier mapping: CUSIP or name must match SEC as-filed data; ticker symbols not supported
- Returns empty holders array if no 13F filers reported the issuer in the latest period
- CUSIP must be exactly 9 characters or query returns validation error
- Limit parameter must be between 1 and 100; out-of-range values rejected
- Payment failure returns 402 if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"as_of": "2026-08-31T17:00:00Z",
"count": 1,
"period": "2025-12-31",
"holders": [
{
"cusip": "67066G104",
"issuer": "NVIDIA CORP",
"shares": 4000,
"put_call": null,
"accession": "0001566307-26-000071",
"value_usd": 500000,
"manager_cik": "0001566307",
"manager_name": "Ramiah Investment Group"
}
],
"periods_held": [
"2025-12-31",
"2025-09-30"
]
}
}Tags
x402
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