ValueSider Superinvestor Data

Dynamically fetches portfolio and trading activity for value investors (Superinvestors) from ValueSider, based on SEC 13F filings. Real-time flow: fetch page with web_fetch → parse with script → return JSON.

When to use

• User asks for a Superinvestor / guru portfolio (e.g. Warren Buffett, Mason Hawkins, Longleaf Partners).
• User asks for 13F holdings or what stocks does [manager/fund] own.
• User asks for buy/sell activity (what is [guru] buying or selling).
• User mentions ValueSider or valuesider.com in the context of portfolio data.

Real-time flow (recommended)

ValueSider often returns 403 for direct HTTP requests. Use web fetch to get page content, then parse with the script.

Step 1: Resolve guru slug

• If the user gave a name (e.g. "Mason Hawkins"), use a known slug such as mason-hawkins-longleaf-partners, or fetch https://valuesider.com/value-investors with web_fetch and find the matching link (slug is the path between /guru/ and /portfolio).
• Common slugs: warren-buffett-berkshire-hathaway, mason-hawkins-longleaf-partners, seth-klarman-baupost-group, bill-ackman-pershing-square-capital-management.