v3

latestOpenAPI 3.1.02026-07-26490368.4 KB

Fund Letters

List fund letters

Lists the published fund letters for one calendar year (optionally one quarter) — quarterly, annual and interim letters from hedge funds, mutual funds, investment partnerships and other professional investors, with extracted per-company theses available via the letter detail endpoint.

Rows are sorted by reporting period, newest first. Narrow further with quarter, or with investorId/fundId from the investors endpoints (an investor's complete letter feed across all years is on /v1/fund-letters/investors/{investorId}). Every row carries the companies the letter discusses (companyKeys), so the list is also a cheap way to scan a period's coverage. A period with no published letters returns an empty page, not an error.

The corpus is curated: only complete, quality-checked letters from 2020 onward are published, and each letter appears once (the same letter distributed through multiple channels is deduplicated). Identifiers are permanent; counts can drift slightly between daily publishes as new letters arrive and the company universe evolves.

get/v1/fund-letters

Query parameters

apiKeystring

API Key (alternatively send via X-Api-Key header)

yearinteger required

Calendar year of the reporting period (2020 or later). Required.

Example:2026

quarterinteger

Optional. Calendar quarter (1-4) within the year. Omit for the whole year.

Example:1

investorIdstring

Optional. Only letters from this investor (fscl_investor_… identifier).

Example:fscl_investor_4NYT7FZS641

fundIdstring

Optional. Only letters from this fund (fscl_fund_… identifier).

Example:fscl_fund_8QHH7PGT769

pageNumberinteger

Optional. Page number (1-indexed). Defaults to 1.

Example:1

pageSizeinteger

Optional. Rows per page. Defaults to 250, max 1000.

Example:250

Response

Paginated fund letters, newest reporting period first.

Example response

{
  "pagination": {
    "page": 1,
    "pageSize": 250,
    "totalCount": 512,
    "totalPages": 3,
    "hasNextPage": true
  },
  "data": [
    {
      "letterId": "fscl_document_5TXS2CWP534",
      "investorId": "fscl_investor_4NYT7FZS641",
      "fundId": "fscl_fund_8QHH7PGT769",
      "investorName": "Baron Capital",
      "fundName": "Baron Discovery Fund",
      "fundType": "mutual_fund",
      "title": "Baron Discovery Fund Quarterly Letter March 31, 2026",
      "reportPeriod": "2026Q1",
      "reportPeriodYear": 2026,
      "reportPeriodQuarter": 1,
      "reportPeriodType": "quarterly",
      "periodLabel": "Quarter Ended March 31, 2026",
      "publicationDate": "2026-04-15",
      "letterType": "quarterly_letter",
      "thesisCount": 11,
      "keyTopics": [
        "artificial_intelligence"
      ],
      "companyKeys": [
        "NYSE_DT"
      ],
      "companyTickers": [
        "DT"
      ]
    }
  ]
}