{"uid":"cap_bNWCqwMf2YZdQp5ImGzDk","slug":"13f-institutional-holdings-portfolio-changes-aef75ff3","name":"13F Institutional Holdings Portfolio Changes","description":"Quarter-over-quarter 13F portfolio diff for one manager — new positions, exits, increases, decreases with share/value deltas (what Berkshire bought this quarter)","url":"https://x402.professorsausages.com/13f-holdings/manager/:cik/changes","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_fVoqq4aLgTRY4PMXxQ3r7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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","exampleAgentPrompt":"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?","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:45:09.197Z","isFirstParty":false}