Investor letters

GET /v1/letters

Investor letters (fund and partnership letters) bullpen.news has read, newest first: all of them, only those that discuss a ticker, or only one firm's. Any other parameter is refused.

Parameters

Parameter	Type	Description
`ticker`	string	Only letters that discuss this company, by its ticker.
`firm`	string, 1 to 100 characters	Only letters by this firm, by its name. Spaces at either end don't count, and it can't contain a null character.
`limit`	integer, 1 to 100, default 10	How many results to return, from 1 to 100.
`cursor`	string	The nextCursor a previous call returned, for the next page. Keep the other arguments the same.

curl Python JavaScript

curl "https://api.bullpen.news/v1/letters?limit=2" \
  -H "Authorization: Bearer $BULLPEN_KEY"

import os, requests

r = requests.get(
    "https://api.bullpen.news/v1/letters",
    params={"limit": 2},
    headers={"Authorization": f"Bearer {os.environ['BULLPEN_KEY']}"},
)
r.raise_for_status()
print(r.json())

const r = await fetch('https://api.bullpen.news/v1/letters?limit=2', {
	headers: { Authorization: `Bearer ${process.env.BULLPEN_KEY}` }
});
if (!r.ok) throw new Error((await r.json()).detail);
console.log(await r.json());

What comes back

Field	Type	Description
`letters`	array of Letter	Newest first.
`tickers`	map of TickerEntry	Each company the results name, by ticker.
`nextCursor`	string	Pass it as cursor for the next page. Left out on the last page.

Header	Sent with	Description
`Request-Id`	every answer	This request's id, such as req_ followed by 24 letters and digits. Quote it to support.
`RateLimit-Policy`	200, 400, 404, 429, 500, 503	Your plan's quotas, per minute and per day (IETF draft-11). It may change to match the RFC.
`RateLimit`	200, 400, 404, 429, 500, 503	What each window has left, and the seconds until it resets (IETF draft-11).
`WWW-Authenticate`	401	Bearer realm="bullpen.news"
`Retry-After`	429, 503	How many seconds to wait.

GET /v1/letters?limit=2

{
  "letters": [
    {
      "id": "letter:1249",
      "kind": "letter",
      "title": "Aristotle Core Bond Fund Commentary",
      "firm": "Aristotle Funds",
      "period": "3Q26",
      "published": "2026-09-30T12:00:00Z",
      "wentLive": "2026-10-31T16:30:21Z",
      "summary": "Aristotle Core Bond Fund increased investment-grade corporate and agency and non-agency mortgage-backed securities exposure while reducing government and agency holdings. The portfolio favored BBB issuers, securitized credit, higher-quality hyperscalers, global systemically important banks, utilities and select office REITs, while remaining cautious on consumer cyclicals, healthcare and retail.",
      "url": "https://cdn.prod.website-files.com/642414d0e893bb832996f598/6ae514b69037df5e7f874c4a_Aristotle%20Core%20Bond%20Fund%20Commentary.pdf",
      "companies": []
    },
    {
      "id": "letter:1248",
      "kind": "letter",
      "title": "Aristotle Short Duration Income Fund Commentary",
      "firm": "Aristotle Funds",
      "period": "third quarter 2026",
      "published": "2026-09-30T12:00:00Z",
      "wentLive": "2026-10-31T16:30:26Z",
      "summary": "Aristotle Short Duration Income Fund reduced Treasury and bank-loan exposure while adding investment-grade corporates and non-agency mortgages to improve risk-adjusted yield. The portfolio favored BBB corporates, investment-grade CLO debt, senior ABS, banks, utilities, select office REITs and higher-quality hyperscalers, while remaining cautious on consumer cyclical, healthcare and retail-related credits.",
      "url": "https://cdn.prod.website-files.com/642414d0e893bb832996f598/6ae5140065ede339eeb64fa7_Aristotle%20Short%20Duration%20Income%20Fund%20Commentary.pdf",
      "companies": []
    }
  ],
  "tickers": {},
  "nextCursor": "WyJsZXR0ZXJzIiwibGV0dGVycyIsIlJCTnZvMVd6WjRvUlJxMFciLDJd"
}

Status codes

Status	Meaning	Codes
`200`	The answer.
`400`	A parameter is invalid or unknown (invalid_request), a key is in the URL (key_in_url), or a cursor is not this call's (invalid_cursor).	`key_in_url`, `invalid_request`, `invalid_cursor`
`401`	No valid key (unauthorized), or a revoked one (revoked).	`unauthorized`, `revoked`
`403`	Your account can't use this endpoint now: invite, disabled, terms, no_plan, ended, unpaid or tool.	`no_plan`, `ended`, `unpaid`, `terms`, `disabled`, `invite`, `tool`
`404`	Nothing by that ticker, firm, id or day (not_found).	`not_found`
`429`	Your plan's minute or day limit is reached (minute, day).	`minute`, `day`
`500`	Something went wrong on bullpen.news (internal).	`internal`
`503`	The API is paused (off), busy (ceiling) or having trouble (unavailable). Retry-After comes with all but off.	`ceiling`, `off`, `unavailable`

Fresh: Letters arrive 3 to 4 weeks after their quarter ends. Up to a minute old.
History: Periods back to 2015 for some firms.
Cost: One call.