QW Research Data API
Clean 13F / institutional-ownership data as an API — so you don't maintain an EDGAR pipeline.
Deduplicated filers
No parent/subsidiary double-counting that pushes ownership over 100%. Filer groups resolved.
Canonical tickers
CUSIP→ticker mapping done properly — the ~half of raw CUSIPs that don't resolve, resolved.
Point-in-time correct
Amendments and restatements handled, back to 2013. What was known when, not silently overwritten.
Breadth
13F holdings today; Form 4 (insider) and N-PORT (fund holdings) on the same surface next.
Get a free key
Free tier is 200 requests/day — enough to prototype an institutional-ownership feature.
Call the API with your key
Send your key as a Bearer token — for example, the top institutional holders of a ticker:
curl -H "Authorization: Bearer <api_key>" \
https://qwresearch.com/api/v1/demo/top-holders/AAPLCheck your key and today's usage any time at /api/v1/keys/me.