Houghton Adam 4

What Happened Adam Houghton, Chief Business Officer of Upstream Bio, sold 699 shares of UPB on 2026-03-16 at $9.29 per share for a total of about $6,494. The sale was reported on a Form 4 filed 2026-03-17 and reflects shares disposed to cover tax withholding related to vesting restricted stock units, not an open discretionary sale.

Key Details

• Transaction date and price: 2026-03-16 — 699 shares sold at $9.29 each.
• Total value: Approximately $6,494.
• Shares owned after transaction: Not disclosed in the provided filing summary.
• Footnote: Sale was automatic under the issuer's "sell-to-cover" policy to satisfy tax withholding on RSU vesting; the sale was not at the reporting person's discretion.
• Filing timeliness: Form 4 filed 2026-03-17 (within the typical reporting window).

Context Sell-to-cover transactions are routine when restricted stock units vest — a portion of shares are automatically sold to cover taxes. Such automatic sales are generally administrative and do not necessarily indicate insider views on the company's outlook.