Institutional Holdings Intelligence

Track what notable investors are buying and holding

Use SEC filing data to review institutional 13F portfolios, follow fresh insider Form 4 activity, and filter BTC treasury-linked names in one place.

Primary dataset

13F-HR

Secondary dataset

Form 4

Delivery model

Static JSON

Update cadence

Daily refresh

Open holdings explorer Browse filer pages View BTC x 13F hub Download raw JSON

Independent project. Not affiliated with the separate "I/O Fund" newsletter.

Data as of: 2026-08-18. Source: SEC EDGAR filings.

How to use this in 60 seconds

Start on Holdings to search by filer, issuer, ticker, or CUSIP.
Use the BTC filter to isolate BTC treasury-linked records.
Open any filer page to inspect top positions and filing context.
Use Form 4 JSON for more frequent insider activity between 13F cycles.

Current tracked filers

Coverage is intentionally curated first, then expanded. Each filer has a dedicated static page that can rank for long-tail queries like "what is [filer] buying".

Berkshire HathawayView latest 13F snapshot Bridgewater AssociatesView latest 13F snapshot Pershing SquareView latest 13F snapshot Scion Asset ManagementView latest 13F snapshot

Data quality and limitations

13F filings are delayed snapshots, not real-time positions.
Form 4 records can include non-open-market transactions.
Ticker mapping may be incomplete for some issuers and classes.
Always verify critical details directly on SEC EDGAR.

Full methodology, parsing rules, and known limitations: Methodology.