{ "openapi": "3.0.1", "info": { "title": "🐋 13F Holdings Delta Tracker — Hedge-Fund Position Changes", "description": "Track quarter-over-quarter CHANGES in institutional 13F filings. New positions, increased stakes, decreased stakes, full exits. What Buffett, Tiger Global, Bridgewater, Renaissance just bought or sold. Direct SEC EDGAR. Pay-per-delta. 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Matches case-insensitive substring against the SEC EDGAR 13F filer name. Examples: 'Berkshire Hathaway' (Warren Buffett), 'Tiger Global', 'Bridgewater', 'Renaissance Technologies', 'Pershing Square' (Ackman), 'Third Point' (Loeb), 'Greenlight' (Einhorn), 'Appaloosa' (Tepper), 'Citadel', 'Point72' (Cohen), 'Coatue', 'Lone Pine'. Leave empty and use fund_ciks for exact-match lookups, or leave both empty to use the curated 50-fund whale list.", "default": [], "items": { "type": "string" } }, "fund_ciks": { "title": "Fund CIKs (exact match)", "type": "array", "description": "List of SEC CIK numbers for exact-match fund lookups. CIK is the SEC's permanent identifier for every registered filer. Examples: 0001067983 (Berkshire Hathaway), 0001167483 (Tiger Global Management), 0001350694 (Bridgewater Associates), 0001037389 (Renaissance Technologies), 0001336528 (Pershing Square), 0001040273 (Third Point), 0001079114 (Greenlight Capital). Use this when fund_names is ambiguous or the manager has multiple entities. Look up CIKs at https://www.sec.gov/cgi-bin/browse-edgar.", "default": [], "items": { "type": "string" } }, "delta_types": { "title": "Delta types to include", "type": "array", "description": "Which categories of position changes to include. NEW = position went from zero last quarter to non-zero this quarter (highest-signal — fresh conviction trade). INCREASED = existing position grew in share count. DECREASED = existing position shrunk. EXITED = position went to zero (full exit, also high-signal — fund lost conviction or rotated). Most quant signal portfolios use only NEW + INCREASED.", "default": [ "NEW", "INCREASED", "DECREASED", "EXITED" ], "items": { "type": "string" } }, "min_value_usd": { "title": "Minimum position value (USD)", "minimum": 0, "maximum": 10000000000, "type": "integer", "description": "Skip delta records where the current-quarter position value is below this threshold. Filters out trivial $1K rebalances. Common thresholds: $1,000,000 (material trades only), $10,000,000 (top-50 holdings for mega-funds), $100,000,000 (mega-cap conviction trades — Berkshire-tier signals). Leave at 0 to include every delta no matter how small.", "default": 0 }, "min_shares_change_pct": { "title": "Minimum % share change", "minimum": 0, "maximum": 1000, "type": "integer", "description": "For INCREASED and DECREASED deltas only — require the absolute percentage change in share count to exceed this threshold. Filters out routine 1-2% rebalances. Recommended: 10 (material rebalance), 25 (meaningful conviction shift), 50 (high-conviction add/trim). NEW and EXITED records always pass (infinite/full %). Leave at 0 for no filter.", "default": 0 }, "limit": { "title": "Max delta records to return", "minimum": 1, "maximum": 2000, "type": "integer", "description": "Maximum number of delta records to push to the dataset (one row per stock-level position change per fund). Typical hedge-fund-tracker analysts pull 50–200 deltas per refresh — that's the top conviction moves across the whale list. Heavy backtesters pull 1000+. Each delta record is a pay-per-result charge of $0.25.", "default": 50 }, "include_top10_flag": { "title": "Flag entries into the top 10 holdings", "type": "boolean", "description": "If true, compute the boolean is_top10_new flag for each NEW / INCREASED delta — true means the stock entered the fund's top 10 portfolio positions this quarter (by USD value). This is the strongest single-delta signal — when a mega-fund vaults a new name into the top 10 it usually means a multi-billion-dollar capital commitment. 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