API
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Institutional Ownership (13F)

Access detailed records of institutional holdings, fund composition, and quarterly 13F filing aggregates.

GET https://data.businessquant.com/13f?mode={mode}&{identifier}&api_key={api_key}

Parameters

Filter institutional ownership records by querying either an issuing company (to see who holds it) or an institutional owner (to see what they hold). You must provide an API key, a data mode, and exactly one Identifier context based on your selected mode.

Parameter Description
api_key
Required
Your unique API key for authentication.
mode
Required
Data mode. Valid options: summary, stats, topholders, alltransactions, historic.
Note: summary and stats strictly require the ticker_issuer parameter.
Format: mode=historic
ticker_issuer
Conditional Identifier
The stock ticker symbol of the issuing company.
Format: ticker_issuer=AAPL
cik_issuer
Conditional Identifier
The CIK number of the issuing company.
Format: cik_issuer=320193
cik_owner
Conditional Identifier
The CIK number of the institution/fund filing the 13F.
Format: cik_owner=1166559
period
Optional
Lookback period (e.g., 1y, 6m, ytd, max).
Format: period=3y
Example cURL Request 
curl -X GET "https://data.businessquant.com/13f?ticker_issuer=AAPL&mode=historic&period=3y&api_key=YOUR_API_KEY"
Sample Response 
{
    "metadata": {
        "ticker_issuer": "AAPL",
        "cik_issuer": null,
        "ticker_owner": null,
        "cik_owner": null,
        "cusip": "037833100",
        "page": 1,
        "page_size": 100,
        "total_records": 85599,
        "total_pages": 856
    },
    "data": [
        {
            "cik_filer": 1315339,
            "reportperiod": "2026-03-31",
            "filingdate": "2026-04-01",
            "accession": "0001315339-26-000002",
            "transaction_sno": 27,
            "title_class": "COMMON STOCK",
            "cusip": "037833100",
            "value": 2393241.0,
            "shprn_amount": 9430.0,
            "shprn_type": "SH",
            "put_call": "nan",
            "quarter": "2026-03-31",
            "ticker_issuer": "AAPL",
            "name_filer": "First Financial Bank - Trust Division",
            "name_filer_short": "First Financial Bank - Trust Division",
            "tag": "Ongoing quarter",
            "name_issuer": "Apple Inc.",
            "name_issuer_short": "Apple"
        },
        {
            "cik_filer": 1601622,
            "reportperiod": "2026-03-31",
            "filingdate": "2026-04-01",
            "accession": "0001601622-26-000002",
            "transaction_sno": 2,
            "title_class": "common",
            "cusip": "037833100",
            "value": 300.0,
            "shprn_amount": 1218.0,
            "shprn_type": "SH",
            "put_call": "nan",
            "quarter": "2026-03-31",
            "ticker_issuer": "AAPL",
            "name_filer": "LBJ Family Wealth Advisors, Ltd.",
            "name_filer_short": "LBJ Family Wealth Advisors",
            "tag": "Ongoing quarter",
            "name_issuer": "Apple Inc.",
            "name_issuer_short": "Apple"
        },
        ...
    ]
}

Endpoint Variations

Below are the distinct ways to formulate your request depending on the mode you use. You can copy these directly into your application.

1. Top Holders of an Issuer 
https://data.businessquant.com/13f?mode=topholders&ticker_issuer=AAPL&api_key=YOUR_API_KEY
2. Historic Holdings of an Institution 
https://data.businessquant.com/13f?mode=historic&cik_owner=1166559&api_key=YOUR_API_KEY
3. Issuer Summary Statistics 
https://data.businessquant.com/13f?mode=summary&ticker_issuer=AAPL&api_key=YOUR_API_KEY