# 13F Institutional Holdings Portfolio Changes

> 13F Institutional Holdings Portfolio Changes is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Returns a quarter-over-quarter 13F portfolio diff for a given institutional manager — listing new positions, exits, increases, and decreases with share and value deltas

## Facts

- Endpoint: GET https://x402.professorsausages.com/13f-holdings/manager/:cik/changes
- Price: $0.03/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-portfolio-changes-aef75ff3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bNWCqwMf2YZdQp5ImGzDk

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-portfolio-changes-aef75ff3
```

Example prompt: Can you pull up the 13F portfolio changes for Berkshire Hathaway — their CIK is 0001067983 — and show me what they bought, sold, or resized this quarter?

## When to prefer this

Use this endpoint when you need structured, per-manager 13F portfolio change data (what was bought, sold, added to, or trimmed) for a specific institutional manager identified by their SEC CIK number. Prefer this over raw SEC EDGAR scraping when you want pre-computed deltas (share and value changes) without parsing raw XML filings yourself.

## Known failure modes

- Invalid or non-existent CIK returns an error or empty result
- Manager has not filed a 13F for the relevant quarter (no data available)
- Very recent filings may not yet be processed into the dataset
- CIK format issues (missing leading zeros or wrong format) can cause lookup failures

## How this service works

Quarter-over-quarter 13F portfolio diff for one manager — new positions, exits, increases, decreases with share/value deltas (what Berkshire bought this quarter)

## Output

A quarter-over-quarter diff of a manager's 13F portfolio, including new positions opened, positions fully exited, and holdings that were increased or decreased — each with share count deltas and estimated USD value changes.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/13f-institutional-holdings-portfolio-changes-aef75ff3/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)