Stockslash

npx add-mcp 'https://stockslash.com/mcp'

Connect in one minute

Every app below needs only the link at the top of this page. Nothing to install, no sign-up.

Claude (web and desktop app)

Open Claude ↗

1. Open Customize → Connectors (in some versions: Settings → Connectors) and choose Add custom connector.
2. Name it Stockslash, paste https://stockslash.com/mcp, leave the rest empty and click Add.
3. In a chat, click + → Connectors and switch Stockslash on.

Works on every Claude plan (the free plan allows one custom connector). Claude has no one-click install for connectors yet, so the link is pasted once.

ChatGPT

Open ChatGPT ↗

1. Open Settings → Apps & Connectors (newer versions: Plugins) → Advanced and turn on Developer mode. Paid plans; availability depends on plan and region.
2. Click Create (or + Add custom MCP server), name it Stockslash and paste https://stockslash.com/mcp.
3. Set authentication to No authentication, confirm, and create.
4. In a chat, pick Stockslash from the + menu (Developer mode).

Cursor and VS Code

One click opens the app and asks you to confirm. Or add it by hand: { "mcpServers": { "stockslash": { "url": "https://stockslash.com/mcp" } } } in ~/.cursor/mcp.json.

Claude Code

claude mcp add --transport http stockslash https://stockslash.com/mcp

Any other MCP app

Add a remote (HTTP) MCP server with the link above, no authentication. Also listed on the Smithery registry.

Try asking

Plain names work: no tickers or fund IDs needed. Answers link back to the Stockslash page they come from.

• What did Warren Buffett buy and sell last quarter?
• Which top investors own Nvidia, and who added to it?
• Compare Bill Ackman's and Michael Burry's portfolios.
• Which stocks are company insiders buying right now?
• What has Nancy Pelosi traded recently?
• Is the stock market expensive right now?

13F holdings are filed up to 45 days after each quarter ends, so they show positions as of that quarter, not today. This is public filing data, not investment advice.

Tools (27)

Natural names work: Pass investor: "Buffett" or stock: "Apple"; fuzzy resolution figures out the rest. The start-here bundle tools answer most questions in one call.

Start here: one call answers most questions

Tool

Purpose

Required

Optional

analyze_investor

Everything about one fund: portfolio value and 8-quarter trend, top 10 holdings, recent trades, style. Flags funds that stopped filing.

Needs: investor

analyze_stock

Everything about one stock: which funds hold it, who bought or sold last quarter, recent insider trades.

Needs: stock

compare_investors

Two funds side by side: stocks both own, stocks only one owns, opposite moves.

Needs: investor_a, investor_b

get_market_conditions

Is the stock market expensive, and how many of 3 recession warning signs are on; with what happened next in the past.

get_whos_buying

Are top funds, company insiders and Congress buying or selling more than usual right now?

Investors

Tool

Purpose

Required

Optional

get_super_investors

The ~80 tracked funds: value, positions, style, top 3 holdings. Biggest first; search by name or style.

Optional: search, type, quarter, limit, include_full_holdings

get_investor_current_holdings

Every stock one fund holds, with value, % of portfolio and the latest change.

Needs: investor

Optional: quarter, include_history

get_investor_fund_value

One fund's portfolio value and the quarter it is for.

Needs: investor

get_investor_fund_value_history

One fund's portfolio value every quarter, with quarterly and yearly change.

Needs: investor

get_fund_activity

What one fund bought, added to, trimmed and sold in its latest report (or any quarter).

Needs: investor

Optional: quarter, include_all_quarters

get_fund_distribution

How much one fund buys and sells each quarter: buy-and-hold or active trader.

Needs: investor

Stocks

Tool

Purpose

Required

Optional

get_stock_holders

Which tracked funds hold a stock, sorted by how big a bet it is for each (top 20).

Needs: stock

Optional: quarter, limit, include_all_fields

get_stock_activity

Which funds bought or sold a stock in the latest complete quarter, with counts like the stock page.

Needs: stock

Optional: quarter, include_all_quarters

get_ownership_statistics

How much of one stock the tracked funds hold: number of funds, shares, dollar value, top 5 holders.

Needs: stock

Optional: quarter

Insiders and Congress

Tool

Purpose

Required

Optional

get_insider_trades

One stock's insider trades (SEC Form 4): who, title, shares, value, date. Payroll-plan buys flagged.

Needs: stock

Optional: limit, transaction_type

get_insider_summary

One stock's insider buys vs sells over a window, top buyers and sellers. Payroll-plan buys not counted.

Needs: stock

Optional: days_back

get_latest_insider_buys

The newest insider purchases across the market, $25K+ by default; payroll-plan buys left out.

Optional: scope, days, min_value, limit, include_plan_buys

get_top_insider_stocks

Stocks ranked by insider buying; by default stocks the tracked funds own.

Optional: scope, days, limit

get_congress_trades

Stock trades by members of Congress (STOCK Act): member, party, stock, buy/sell, amount range, options marked call/put.

Optional: member_name, ticker, transaction_type, limit

get_congress_consensus

Stocks several members of Congress bought, with their names. Puts are not counted as buys.

Optional: days, min_members, limit

Market and rankings

Tool

Purpose

Required

Optional

get_filings_buy_status

Stocks bought by the most tracked funds in a quarter (latest complete one by default).

Optional: quarter, limit

get_filings_sell_status

Stocks sold by the most tracked funds in a quarter (latest complete one by default).

Optional: quarter, limit

get_stocks_funds_are_adding

Stocks more tracked funds added than cut over 2 years (clear buying). What funds did, not a forecast.

Optional: limit

get_sp_stocks_by_holders

The stocks held by the most tracked funds (top 500), with the dollar value they hold.

Optional: limit, include_all_fields

get_ownership_statistics_home

Quarter snapshot: most-held stocks, biggest single-fund bets, most bought and sold.

Optional: limit

get_latest_filings_updates

The newest 13F reports filed, with fund and quarter.

Optional: limit

get_latest_quarter

The latest quarter all funds have reported, and how many have filed so far.

Quarter filters use the form Q4-2025 (case-insensitive). Omit for latest. get_stock_holders returns funds (BlackRock-class); get_insider_trades / get_insider_summary return execs and directors (Form 4).

For developers

Model Context Protocol over HTTP (JSON-RPC 2.0, stateless). Protocol versions 2025-06-18, 2025-03-26 and 2024-11-05. Every tool has an outputSchema and returns structuredContent.

List the tools

curl -X POST https://stockslash.com/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Call a tool

import requests

r = requests.post(
  "https://stockslash.com/mcp",
  json={
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "analyze_investor",
      "arguments": {"investor": "Warren Buffett"}
    }
  },
)
print(r.json()["result"]["structuredContent"])

Citing

Every result carries a source object: the page with those figures (url), the quarter, the filing type and a ready-made cite_as line. Please link that page when you use the data.

Errors and limits

429Rate limit: 200 requests per 15 minutes per visitor

-32601Unknown method (typo in method)

-32602Unknown tool or invalid params

isErrorA tool that ran but could not answer (e.g. unknown ticker) returns a normal result with isError: true and a readable message

Quarter filters use the form Q4-2025; omit them for the latest quarter all funds have reported. New tools may be added; read tools/list instead of hard-coding names.