Form 4: Upstream Bio Exec Sells Shares for Tax Withholding

Upstream Bio, Inc. CFO and COO Michael Gray reported a sale of 853 shares of common stock to cover tax withholding obligations related to vested restricted stock units.

Summary

• Michael Gray, CFO and COO of Upstream Bio, Inc., reported a transaction on June 16, 2026.
• The transaction involved the sale of 853 shares of common stock.
• The sale was executed at a price of $6.1 per share.
• These shares were sold to satisfy tax withholding obligations associated with the vesting of restricted stock units.
• The sales were conducted under the company's 'sell-to-cover' policy and were not at the discretion of the reporting person.
• Following this transaction, Michael Gray beneficially owns 28,795 shares of common stock directly.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing, as the transaction is a routine administrative action to cover tax obligations rather than a reflection of the executive's view on the company's future prospects.

Negatives

• A portion of the executive's equity award was sold, reducing their direct shareholding.

Future Outlook

No specific future outlook or guidance is provided in this filing, as it solely reports a past transaction.

Management Comments

• The sales reported on this Form 4 represent the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units.
• Such sales were automatic and not at the discretion of the Reporting Person.

Industry Context

StockSavvy.ai notes that Form 4 filings are standard for reporting insider transactions, particularly for executives managing equity compensation. The 'sell-to-cover' strategy is a common mechanism to handle tax liabilities arising from equity vesting without requiring the executive to use personal funds.

Stakeholder Impact

• Shareholders: A minor reduction in the direct shareholding of a key executive, but executed under a pre-defined policy for tax management, not indicative of a change in confidence.

Key Dates

Keywords

Form 4, SEC Filing, Insider Transaction, Stock Sale, Tax Withholding, Restricted Stock Units, Upstream Bio, Inc., Michael Gray, CFO, COO