See what the big funds own — and how it changed.

Ownership per stock, from the source

For a given stock, see which of the tracked institutions reported holding it, with shares and value as filed, pulled from SEC 13F-HR filings on EDGAR — the public, penalty-of-law record, not a rumor feed. The list is a curated set of 37 well-known managers, not every 13F filer, so “none of the tracked institutions holds it” is a statement about those 37 only.

Quarter-over-quarter change is the signal

A single filing is a photograph; two in a row tell a story. Tradune highlights new buys, adds, trims and full exits between quarters — the direction of travel that carries more information than any static snapshot.

Read it with the right caveats

13F data is quarter-end and filed up to 45 days late, and shows only the long book — no shorts, cash or hedges. Tradune links straight to the original filing so you can check the source and read it for what it is: a research starting point, not a shopping list.

How does Tradune read 13F filings?

1. 1

   A fixed list of 37 filers

   Each manager is identified by its SEC filer number (CIK), checked against EDGAR, and the name shown is the one in SEC’s own records. The list includes long-term investors such as Berkshire Hathaway and Baupost, activists such as Pershing Square and Third Point, and quantitative firms such as Renaissance Technologies and Two Sigma. Polling a short list, not all filers, keeps the data checked and the request load on SEC small.

2. 2

   The latest original 13F-HR, checked daily

   A daily job looks for each manager’s newest 13F-HR filing and reads its information table. Amendments are not used, so a later correction filed as a 13F-HR/A does not replace the original here. A quarter already stored is not read twice.

3. 3

   CUSIP to ticker, never guessed

   13F filings list securities by CUSIP, not ticker. Each CUSIP is mapped to a ticker through a crosswalk; a CUSIP that does not map is stored as unmapped and left out of ticker views rather than matched by name, and is retried on later runs.

4. 4

   Values put on one scale

   SEC changed the value column from thousands of dollars to whole dollars for periods ending on or after December 31, 2022. Older periods are multiplied by 1,000 so every value is in dollars. Rows for the same security filed under several sub-managers are added together.

5. 5

   Shares, not options, compared quarter to quarter

   Put and call lines carry the underlying stock’s CUSIP, so they are kept apart from the share position and are not shown in the holder table. Each share position is compared with the same manager’s previous stored quarter and labelled opened, added, trimmed, held or — when it disappears — exited.

How is a quarter-over-quarter change labelled?

The label compares share counts only, between one manager’s two consecutive 13F filings. Read the caveats in what 13F filings reveal — and quietly hide.

A change in share count can come from a split rather than a trade, and the label cannot tell the difference; the filing link lets you check. Values are the manager’s own quarter-end figures, so a position can grow in dollars while its share count is unchanged.

Managers file up to 45 days after quarter-end, so the table shows the quarter and the range of filing dates it covers. A holding can be opened and sold again between two filings without ever appearing.