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Trade Filings
Managers Stocks Filings Superinvestors
Signals Institutional Buying Institutional Selling Insider Activity 13D & 13G Watch Sector Rotation
Tools Stock Screener Manager Screener Compare Managers Consensus Baskets All Research Tools Data API
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DATA PLANS

Historical data downloads — coming with accounts.

API GATEWAY

Free read-only JSON access to the site's cached data.
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🧭 Guided View
New to markets — prices, yields, YTD, market cap? We explain every term as you browse, in plain English. Same data, with the help built in.

⚡ Expert View
You already know the market. Just the data — clean, fast and compact, with no extra explanations. This is the default view.

Interface language
Engraved drafting instruments resting on an unrolled chart

The Instruments

Every research tool on the atlas, each with a one-line honest description of what it can — and cannot — tell you.

01 Stock Screener

Filter securities by ownership breadth, growth, streaks, concentration and sector.

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02 Manager Screener

Filter tracked managers by reported value, position count, concentration and turnover.

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03 Compare Managers

Overlap, shared conviction and distinctive positions for any two tracked managers.

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04 Consensus Baskets

Most-held securities within defined manager groups — criteria always stated.

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05 Institutional Buying

New positions, holder growth, high-conviction entries and accumulation streaks.

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06 Institutional Selling

Exits, shrinking holder bases and the meaningful positions managers left.

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07 Sector Rotation

Percentage-point shifts of tracked value between sectors, quarter over quarter.

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08 Insider Activity

Open-market insider purchases, cluster buying and sales from Forms 3/4/5.

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09 13D & 13G Watch

Five-percent stakes and amendments, days after they happen.

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10 Filing Season

Every 13F as it lands, season progress and the largest reported portfolios.

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11 Superinvestors

The curated prominent managers, with context on what each 13F reveals.

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12 Research Desk

Plain-English questions answered by structured queries over the filing database.

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13 Portfolio Diff

Git-style quarter-vs-quarter comparison on any tracked manager page.

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14 Data API

Free read-only JSON access to everything above, from the site cache.

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Ownership arithmetic

The three little calculations behind every page on this site — try your own numbers.

—Portfolio weight
—Share change
—Ownership of company

Weight = value ÷ portfolio value. Share change = Δshares ÷ prior shares (a position from zero is NEW, not a percentage). Ownership = shares ÷ shares outstanding.