Company · UPB · CIK 2022626

Upstream Bio, Inc. (UPB) SEC filings and CIK.

UPB’s SEC Central Index Key (CIK) is 0002022626, or 2022626 without leading zeros. The SEC’s ticker file lists it as Upstream Bio, Inc..

Ticker: UPB
CIK: 0002022626
Other tickers: None
Insider transactions, Q3 2026: 5

Insider trading

In Q3 2026, insiders at Upstream Bio, Inc. reported 5 non-derivative transactions on 5 Forms 3, 4 and 5, including 0 open-market purchases and 5 sales. See every UPB insider transaction →

Recent filings we observed

From our record of EDGAR’s latest-filings feed and sampled daily indexes. Not a complete filing history; use the filings API for that.
Filed	Form	Accession
2026-11-06	SCHEDULE 13G/A	0000315066-26-002943

Get UPB SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=2022626&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/2022626" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/2022626?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · Upstream Bio, Inc. on SEC.gov

Questions

What is UPB’s CIK number?

UPB’s SEC Central Index Key (CIK) is 0002022626, or 2022626 without leading zeros. The SEC’s ticker file lists it as Upstream Bio, Inc..

How do I find Upstream Bio, Inc.’s 10-K?

Request /api/v1/filings?cik=2022626&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/upb.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.