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13F Institutional Holdings Portfolio Changes
x402
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
Price / call$0.03
Success—
StatusUnknown
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.
Example use cases
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?”
Technical details
Endpoint
GEThttps://x402.professorsausages.com/13f-holdings/manager/:cik/changesWhen to prefer
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.
Side effects
- 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
Tags
x402
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