Reference

Data

Measurements computed from primary regulatory filings, published in full and free to reuse. The fund industry does not publish these about itself, and the reason is not that they are hard to compute.

Updated 2026-09-01 ETF concentration Effective number of holdings for 61 funds, from SEC Form N-PORT. What a holding count looks like once you weight it.

Why these exist

Every figure here is one line of arithmetic away from data US funds are legally required to file. Nobody publishes it because the firms with the data sell services to the firms being measured. That conflict is the whole opportunity, and this site does not have it: no affiliate links, no sponsored coverage, no issuer reviews anything before publication.

Each run is archived with its date. Holdings as of today can be fetched by anyone; holdings as of three years ago can only be read by whoever wrote them down.