# 13F Institutional Holdings Lookup

> 13F Institutional Holdings Lookup is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns the full normalized 13F portfolio for a given institutional manager and quarter, including every reportable position with share counts, market values, put/call indicators, and voting authority breakdowns.

## Facts

- Endpoint: GET https://x402.professorsausages.com/13f-holdings/manager/:cik
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/13f-institutional-holdings-lookup-7589319d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SODi7GrDCa_on9TKPiIKJ

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-institutional-holdings-lookup-7589319d
```

Example prompt: Pull the full 13F portfolio for Bridgewater Associates — their CIK is 1350694 — for the most recent quarter, and show me all their reportable positions with share counts, market values, and any put/call designations.

## When to prefer this

Use this endpoint when you need the complete, normalized 13F portfolio for a specific institutional manager identified by their SEC CIK. Ideal for building institutional ownership databases, tracking hedge fund positions over time, or analyzing a single manager's disclosed equity holdings. Prefer this over scraping SEC EDGAR directly since data is pre-normalized and structured.

## Known failure modes

- Invalid or unknown CIK returns 404 or empty result
- Quarter not yet filed returns no data
- Manager has no 13F obligation (too small) returns empty
- Malformed CIK format causes validation error
- Rate limit or payment failure returns 402/429

## How this service works

Full normalized 13F portfolio for one institutional manager and quarter — every reportable position with values, shares, put/call, voting authority

## Output

A normalized list of every reportable position in the manager's 13F filing for the specified quarter: security name, CUSIP, share count, market value in USD, whether the position is a put or call option, and voting authority (sole, shared, none). Data is structured and ready for analysis.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/13f-institutional-holdings-lookup-7589319d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.professorsausages.com](https://www.zero.xyz/host/x402.professorsausages.com/llms.txt)