secwatch.observer — SEC 8-K summary
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Issuer:     Upstream Bio, Inc. (UPB)
CIK:        0002022626
Form:       8-K
Filed at:   2026-03-26T23:59:59+00:00
Accession:  0001193125-26-126572
Event type: other_material
Sentiment:  neutral
Materiality: 0.60
Item codes: 1.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Upstream Bio enters into $150M at-the-market offering agreement with Leerink Partners
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- Company may sell up to $150M of common stock through Leerink Partners as sales agent.
- Agent will receive up to 3.0% commission on gross proceeds from sales.
- Offering made under existing shelf registration statement; no obligation to sell any shares.
- Sales may be made on Nasdaq or other markets as at-the-market offerings.
- Company can suspend or terminate offering at any time.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/2022626/000119312526126572/0001193125-26-126572-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/2022626/000119312526126572/d110609d8k.htm
  HTML page:      https://secwatch.observer/filing/0001193125-26-126572

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer