Ownership data methodology

Investment managers with over $100M in qualifying US securities must file a Form 13F each quarter, generally within 45 days of quarter-end. We track a curated set of well-known managers (the investors list).

Timing: 13F is quarterly and up to 45 days delayed, so it reflects positions as of a past quarter-end, not today. Each investor is shown at their own most-recent filing; we label every figure with its quarter.

Scope: a 13F reports only long positions in US-listed 13(f) securities. It excludes short positions, cash, bonds, most non-US holdings, and derivatives beyond puts/calls, so it is nota manager’s complete portfolio. We never estimate a cost basis.

Conviction vs. quant:diffuse quant / multi-strat books hold hundreds of names with little single-name signal, so we count them separately from concentrated “conviction” managers. Amendments (13F-HR/A) supersede or supplement the original filing. A manager who has stopped filing is flagged as outdated.

Officers, directors, and 10% owners must report trades in their own company’s stock on Form 4, generally within two business days, so it is much fresher than 13F. See the insider buying screens.

Classification: we show reported non-derivative purchases and sales (SEC codes P and S), which may be open-market orprivate. We exclude option exercises, grants, and shares withheld for taxes, which are not discretionary buying or selling. A sale can be routine (e.g. a pre-set 10b5-1 plan).

Dates: activity windows use the tradedate, not the filing date, so a late-filed old trade doesn’t read as recent. We show both. A cluster buy is two or more distinct insiders buying the same stock within 90 days.

We cover roughly 3,700 US companies with a dedicated page. A holding in a security outside that set (foreign listings, micro-caps, some share classes) is shown by its issuer name rather than as a link. Securities are matched by CUSIP; tickers are a display convenience.

All of this is public filing data presented for research. It is not investment advice or a recommendation. A single filing or transaction is not a signal on its own; consider size, role, timing, and context.