SCHEDULE: Norges Bank Discloses 7.73% Stake in Upstream Bio

Norges Bank has reported a beneficial ownership of 7.73% in Upstream Bio, Inc., holding 4,206,586 shares as of June 30, 2026.

Summary

• Norges Bank, acting as an investment adviser and a non-U.S. institution, has filed a Schedule 13G, indicating an amendment to its previous filing.
• The filing discloses that Norges Bank beneficially owns 4,206,586 shares of Upstream Bio, Inc. common stock.
• This represents 7.7299% of the class of securities.
• The reporting date for this ownership is June 30, 2026.
• Norges Bank holds sole voting power over 3,768,619 shares and sole dispositive power over 3,768,619 shares.
• Shared dispositive power is held over 437,967 shares.
• The filing certifies that the securities were acquired and are held in the ordinary course of business and not for the purpose of influencing control of the issuer.

Sentiment

Score: 3

Explanation: StockSavvy.ai views this as a neutral filing, primarily an informational disclosure of share ownership rather than a strategic announcement.

Positives

• Norges Bank, a significant institutional investor, has a substantial stake in Upstream Bio, Inc., indicating confidence in the company's long-term prospects.
• The filing confirms that the shares are held in the ordinary course of business, suggesting a stable, non-activist investment approach.

Negatives

• The filing does not contain any new financial results or strategic updates, limiting its immediate impact on assessing company performance.

Risks

• The filing does not explicitly mention any new risks or challenges faced by Upstream Bio, Inc.

Future Outlook

The filing does not contain any forward-looking statements or guidance from Upstream Bio, Inc.

Management Comments

• Norges Bank certifies that the securities were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities.

Industry Context

StockSavvy.ai notes that institutional ownership filings like this Schedule 13G are common for publicly traded companies and provide transparency regarding major shareholders. Norges Bank's investment suggests a degree of institutional validation for Upstream Bio, Inc.

Stakeholder Impact

• Shareholders gain transparency into the ownership structure with Norges Bank as a significant holder.

Key Dates

Keywords

Upstream Bio, Norges Bank, Schedule 13G, Beneficial Ownership, Investment Adviser, Common Stock, Shareholder Disclosure