Upstream Bio Files 2025 Annual Report
Ticker: UPB · Form: ARS · Filed: Apr 16, 2026
Sentiment: neutral
Topics: annual-report, pharmaceuticals, sec-filing
TL;DR
Upstream Bio filed its 2025 ARS on 4/16/26. Check it for pharma updates.
AI Summary
Upstream Bio, Inc. filed its Annual Report to Security Holders (ARS) on April 16, 2026, for the period ending December 31, 2025. The report, filed under accession number 0001193125-26-159033, details the company's operations in the pharmaceutical preparations sector. The filing includes the complete submission text file and a PDF document of the ARS.
Why It Matters
This filing provides shareholders and potential investors with a comprehensive overview of Upstream Bio, Inc.'s financial performance and operational status for the fiscal year 2025.
Risk Assessment
Risk Level: low — This is a routine annual report filing and does not contain new material events or financial distress signals.
Key Numbers
- 2025-12-31 — Fiscal Year End (The report covers the financial performance up to this date.)
- 2026-04-16 — Filing Date (The date the Annual Report to Security Holders was officially filed.)
Key Players & Entities
- Upstream Bio, Inc. (company) — Filer
- 0002022626 (company) — CIK Number
- 2026-04-16 (date) — Filing Date
- 2025-12-31 (date) — Period of Report
- 890 WINTER STREET, SUITE 200 WALTHAM MA 02451 (address) — Mailing and Business Address
FAQ
What is the primary business of Upstream Bio, Inc. according to this filing?
Upstream Bio, Inc. is primarily involved in Pharmaceutical Preparations, as indicated by its SIC code 2834.
What is the accession number for this ARS filing?
The accession number for this filing is 0001193125-26-159033.
When was the period of report for this Annual Report to Security Holders?
The period of report for this filing was December 31, 2025.
Where is Upstream Bio, Inc. located?
Upstream Bio, Inc.'s mailing and business address is 890 WINTER STREET, SUITE 200 WALTHAM MA 02451.
What type of filing is this and what is its purpose?
This is an ARS (Annual Report to Security Holders) filing, which provides security holders with information about the company's performance over a reporting period.
Filing Details
This Form ARS (Form ARS) was filed with the SEC on April 16, 2026 regarding Upstream Bio, Inc. (UPB).