SEC Form 13F filings data showing institutional investment manager holdings
SEC Form 13F filings data showing institutional investment manager holdings. Form 13F is required to be filed quarterly by institutional investment managers with at least $100 million in qualifying assets under management. Can't find what you're looking for? POST feedback to /feedback, no charge.
10000 (raw units)
price
4
calls / 30d
2
unique payers
2026-09-04
updated
Provider
agent.massive.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x525f6dDcE9aF7a7179D7696aaBfCd5FCd15a21e6",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"maxTimeoutSeconds": 60
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"limit": 100,
"sort": "filing_date.desc"
},
"type": "http"
},
"output": {
"example": {
"next_url": "https://api.massive.com/stocks/filings/vX/13-F?cursor=eyJsaW1pd...",
"request_id": "a3f8b2c1d4e5f6g7",
"results": [
{
"accession_number": "0000950123-24-011775",
"cusip": "023135106",
"file_number": "028-04545",
"filer_cik": "0001067983",
"filing_date": "2024-11-14",
"filing_url": "https://www.sec.gov/Archives/edgar/data/1067983/0000950123-24-011775.txt",
"film_number": "241461756",
"form_type": "13F-HR",
"investment_discretion": "DFND",
"issuer_name": "AMAZON COM INC",
"market_value": 1439212920,
"other_managers": [
"Buffett Warren E"
],
"period": "2024-09-30",
"put_call": null,
"shares_or_principal_amount": 7724000,
"shares_or_principal_type": "SH",
"title_of_class": "COM",
"voting_authority_none": 0,
"voting_authority_shared": 0,
"voting_authority_sole": 7724000
},
{
"accession_number": "0000950123-24-011775",
"cusip": "025816109",
"file_number": "028-04545",
"filer_cik": "0001067983",
"filing_date": "2024-11-14",
"filing_url": "https://www.sec.gov/Archives/edgar/data/1067983/0000950123-24-011775.txt",
"film_number": "241461756",
"form_type": "13F-HR",
"investment_discretion": "DFND",
"issuer_name": "AMERICAN EXPRESS CO",
"market_value": 311864270,
"other_managers": [
"Buffett Warren E"
],
"period": "2024-09-30",
"put_call": null,
"shares_or_principal_amount": 1149942,
"shares_or_principal_type": "SH",
"title_of_class": "COM",
"voting_authority_none": 0,
"voting_authority_shared": 0,
"voting_authority_sole": 1149942
}
],
"status": "OK"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"filer_cik": {
"description": "SEC Central Index Key (10 digits, zero-padded) of the filing entity.",
"type": "string"
},
"filer_cik.any_of": {
"description": "Filter equal to any of the values. Multiple values can be specified by using a comma separated list.",
"type": "string"
},
"filing_date": {
"description": "Date when the filing was submitted to the SEC (formatted as YYYY-MM-DD). Value must be formatted 'yyyy-mm-dd'.",
"type": "string"
},
"filing_date.gt": {
"description": "Filter greater than the value. Value must be formatted 'yyyy-mm-dd'.",
"type": "string"
},
"filing_date.gte": {
"description": "Filter greater than or equal to the value. Value must be formatted 'yyyy-mm-dd'.",
"type": "string"
},
"filing_date.lt": {
"description": "Filter less than the value. Value must be formatted 'yyyy-mm-dd'.",
"type": "string"
},
"filing_date.lte": {
"description": "Filter less than or equal to the value. Value must be formatted 'yyyy-mm-dd'.",
"type": "string"
},
"limit": {
"default": 100,
"description": "Limit the maximum number of results returned. Defaults to '100' if not specified. The maximum allowed limit is '1000'.",
"maximum": 1000,
"minimum": 1,
"type": "integer"
},
"sort": {
"default": "filing_date.desc",
"description": "A comma separated list of sort columns. For each column, append '.asc' or '.desc' to specify the sort direction. The sort column defaults to 'filing_date' if not specified. The sort order defaults to 'desc' if not specified.",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://agent.massive.com/stocks/filings/vX/13-F" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://agent.massive.com/stocks/filings/vX/13-F");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://agent.massive.com/stocks/filings/vX/13-F")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/6790.json, and this resource appears in /discovery/resources and /discovery/search.