13F institutional holdings API

What is in it

• ·A cross-filing holdings stream, filterable by manager and by security
• ·The distinct manager index, so you can resolve a filer before you query it
• ·Per-filing detail for any 13F, by filing id

Endpoints

3 endpoints on https://api.3spread.com. Full parameters and response schemas are in the API reference.

Query it

Every dataset is available on the free Community tier. Sign up, provision a key, and query it. No credit card.

curl "https://api.3spread.com/v1/institutional-holdings?limit=10" \
  -H "apikey: $THREESPREAD_API_KEY"

from py3spread import Client

client = Client()  # reads THREESPREAD_API_KEY
page = client.institutional_holdings.list(limit=10)

for row in page["data"]:
    print(row)

What people build with it

• ·Diff a fund's portfolio quarter over quarter to see what they bought and sold
• ·Find every manager holding a given security, and how that changed
• ·Rebuild a manager's position history from their full filing record

Guides using this dataset

• Export a fund's 13F portfolio to CSV

  Pull a manager's latest 13F filing and write every position to a CSV you can open in a spreadsheet, without losing precision on the dollar values. Python, on a free key.

• Find every institution holding a stock (13F, in Python)

  Use 13F filings to list the largest institutional positions in a security, ranked by dollar value, then drill into a single manager's filing history. Runs on a free API key.

The other datasets

All of them are included, free, on the same key.