# 13F Tracker – SEC Institutional Holdings Lookup

> 13F Tracker – SEC Institutional Holdings Lookup is a paid API for AI agents from api.timzinin.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Looks up SEC 13F institutional filing history for a given fund manager by CIK, ticker, or company name, returning recent filings and a summary

## Facts

- Endpoint: POST https://api.timzinin.com/api/thirteen-f-tracker
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/13f-tracker-sec-institutional-holdings-lookup-c2133987
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c35NiYDHjFlf-uF1iHwRH

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 13f-tracker-sec-institutional-holdings-lookup-c2133987 -d '<json body>'
```

Example prompt: Can you look up the 13F institutional filing history for Bridgewater Associates on SEC EDGAR — how many 13F filings have they made in the last 365 days and what's the most recent one?

## When to prefer this

Use this endpoint when you need a fast, pay-per-call lookup of SEC 13F institutional filing history without setting up your own EDGAR scraper. Ideal for agents that need to verify whether a fund manager is actively filing, retrieve the latest accession number for downstream processing, or resolve a company name or ticker to a canonical CIK. Prefer this over raw EDGAR queries when you want structured JSON output with confidence scoring and match basis already resolved.

## Known failure modes

- Manager not found — found:false returned with empty filings array
- Ambiguous name match — multiple candidates returned with lower confidence scores
- Invalid or malformed CIK — resolution fails or returns no results
- SEC EDGAR unavailable — upstream timeout causing elevated run_ms or error
- Payment not settled — request rejected before processing

## How this service works

Pay-per-call data & tool APIs

## Output

Returns a JSON object with metadata (run time, settlement status, item count) and a results array containing: the resolved CIK, company name, match basis, match confidence, filing count over the requested lookback period, a plain-English summary, and an array of recent filings each with form type, filing date, accession number, and a direct SEC EDGAR URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "managers": {
   "type": "array",
   "maxItems": 100
  },
  "sinceDays": {
   "type": "integer",
   "maximum": 3650,
   "minimum": 1
  },
  "maxConcurrency": {
   "type": "integer",
   "maximum": 10,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "meta": {
   "run_ms": 1200,
   "settled": true,
   "item_count": 1
  },
  "results": [
   {
    "cik": "0001067983",
    "found": true,
    "manager": "0001067983",
    "summary": "BERKSHIRE HATHAWAY INC (CIK 0001067983) — 5 13F filings in the last 365 day(s), most recent 13F-HR on 2026-05-15. Resolved from the CIK given, exact.",
    "checkedAt": "2026-07-26T13:23:45.028Z",
    "candidates": [],
    "matchBasis": "cik",
    "companyName": "BERKSHIRE HATHAWAY INC",
    "filingsCount": 5,
    "recentFilings": [
     {
      "url": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001067983&type=13F",
      "form": "13F-HR",
      "filedAt": "2026-05-15",
      "accessionNumber": "0001193125-26-226661"
     }
    ],
    "matchConfidence": 1
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/13f-tracker-sec-institutional-holdings-lookup-c2133987/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.timzinin.com](https://www.zero.xyz/host/api.timzinin.com/llms.txt)