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SiteCheck SEC 13F Holdings Lookup
x402
SiteCheck SEC 13F Holdings Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-16).
Fetches the latest SEC 13F-HR institutional equity holdings filing for a given fund or manager from EDGAR, returning a ranked list of stock positions with values, shares, and voting details.
Price / call$0.004
Success—
StatusUnknown
How this service works
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Output
Returns structured JSON with the filer's name, CIK, EDGAR filing URL, filing date, reporting period end date, total portfolio value, and an array of holdings sorted by market value descending. Each holding includes the issuer name, CUSIP, share class, number of shares, reported USD value, share type, investment discretion, and voting authority breakdown. Also includes counts for total holdings and entries in the filing, plus a truncation flag and disclaimer.
Example use cases
Researching a fund's equity portfolio
“What are the top 50 stock positions in Bridgewater Associates' most recent 13F filing? Look them up by name on EDGAR and show me the value and share count for each.”
Tracking a specific stock across filings
“Does the latest 13F for CIK 0001067983 include a position in Apple? If so, how many shares and what's the reported market value?”
Monitoring total portfolio size of an institution
“What's the total portfolio value that Tiger Global reported on their most recent 13F-HR filing with the SEC? Search by their fund name.”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/sec/13f?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need structured, machine-readable 13F institutional holdings data directly from SEC EDGAR without scraping. Prefer it over raw EDGAR HTML parsing when you need ranked, value-sorted positions with CUSIP identifiers and voting details for a specific fund. It is especially useful for hedge fund research, portfolio overlap analysis, or regulatory compliance checks where official SEC disclosure data is required.
Side effects
- CIK not found: EDGAR returns no results for the given CIK, endpoint returns an error or empty holdings
- Ambiguous name match: when searching by name, the top EDGAR match may not be the intended filer
- Truncated results: filings with more holdings than the limit parameter will be flagged as truncated
- EDGAR downtime: if SEC EDGAR is unavailable, the lookup will fail
- Invalid limit value: limit outside 1–500 range may return an error or be clamped
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"cik": "0001067983",
"note": "Rows are the filing's own entries, largest value first; one security can appear on several rows (different managers or voting authority).",
"source": "SEC EDGAR (public domain) — https://www.sec.gov/cgi-bin/browse-edgar",
"edgarUrl": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001067983&type=13F-HR&dateb=&owner=include&count=10",
"holdings": [
{
"class": "COM",
"cusip": "025816109",
"issuer": "AMERICAN EXPRESS CO",
"shares": 149061045,
"putCall": null,
"valueUsd": 50419898471,
"shareType": "SH",
"discretion": "DFND",
"soleVoting": 149061045
},
{
"class": "CAP STK CL A",
"cusip": "02079K305",
"issuer": "ALPHABET INC",
"shares": 65824467,
"putCall": null,
"valueUsd": 23523689772,
"shareType": "SH",
"discretion": "DFND",
"soleVoting": 65824467
},
{
"class": "COM",
"cusip": "037833100",
"issuer": "APPLE INC",
"shares": 80664820,
"putCall": null,
"valueUsd": 23341172315,
"shareType": "SH",
"discretion": "DFND",
"soleVoting": 80664820
}
],
"checkedAt": "2026-10-15T18:21:06.473Z",
"filerName": "BERKSHIRE HATHAWAY INC",
"truncated": true,
"disclaimer": "Information only, not legal advice. Verify with official sources.",
"filingDate": "2026-08-14",
"holdingsCount": 20,
"totalValueUsd": 299253556246,
"entriesInFiling": 89,
"reportingPeriod": "2026-06-30",
"totalValueSource": "cover page (tableValueTotal)"
}
}Tags
x402
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