MCP-first · SEC Form 13F data sets · period 2026-06-30
Form 13F, exactly as filed — in your AI assistant.
What institutional managers report holding each quarter — listed equities, ETFs and options — served over the Model Context Protocol. Dated, labeled filed or derived, never estimated.
Connect your assistant
13fMCP is MCP-first. Point Claude, Cursor, or any MCP client that speaks Streamable HTTP at this endpoint and query Form 13F directly. No account, no API key — the data is public SEC filings.
https://13fmcp.ai/mcp- search_managersFind 13F filers by name, CIK or linked CRD
- get_managerFiled cover and summary for one manager, with adviser link
- get_holdingsPositions as filed for one manager and quarter
- holding_changesQuarter-over-quarter share changes, computed server-side
- top_managersRank filers by a filed or derived metric
- security_holdersWhich managers filed a position in a CUSIP
- portfolio_overlapOverlap between two managers' filed holdings
- cohort_statsPercentile distributions for a defined cohort
- cohort_chartPercentile box plot with one manager marked
- list_skillsCatalog of the guided workflows on this server
- get_skillFull instructions for one workflow
- server_infoLive tool list and version — detects a stale client cache
Fair-use limits keep the endpoint stable: 60 tool calls per minute, 900 per hour, and 5,000 per day per client. Over the limit, calls return an error with a retry delay.
Skills
Form 13F is public. Reading it well isn’t.
Each skill is a written procedure — what to pull, in what order, how to read it, and what the filing will not support. Your assistant loads one from the server the moment it needs it.
What's in the database
Period of report 2026-06-30, filings through 2026-08-31. Summed straight from filed summary pages. Managers can report the same securities, so this is not market size — and 13F value is not AUM.
Largest filed 13F value
Browse the directory →- BlackRock, Inc.New York, NY$6.73T
- VANGUARD CAPITAL MANAGEMENT LLCMALVERN, PA$4.68T
- STATE STREET CORPBOSTON, MA$3.37T
- FMR LLCBOSTON, MA$2.30T
- VANGUARD PORTFOLIO MANAGEMENT LLCMALVERN, PA$2.22T
- MORGAN STANLEYNEW YORK, NY$1.89T
- GEODE CAPITAL MANAGEMENT, LLCBOSTON, MA$1.88T
- JPMORGAN CHASE & CONEW YORK, NY$1.81T
What a 13F is
- A quarter-end list of US-listed equities, ETFs, listed options and some convertibles held by managers with discretion over $100M or more of such securities.
- Filed within 45 days of quarter end, so a snapshot can be up to 45 days old when it appears.
- Keyed by the filer's SEC CIK. We link to the adviser's CRD where the cover page or SEC roster allows.
What it is not
- Not assets under management. 13F value excludes bonds, open-end mutual funds, cash, private funds and non-discretionary assets.
- No client-level data, and no performance. A change in holdings is not evidence of buying or selling intent.
- Not complete: managers below the $100M threshold are absent, and notice filers (13F-NT) report through another manager.