Ambrose Allison sold UPB
June 16, 2026 · Form 4 insider transaction
Ambrose Allison sold 477 shares of Upstream Bio, Inc. at $6.10 per share, a transaction worth $2.9K. The trade was recorded as open-market sale and disclosed on an SEC Form 4, filed 1 day after the transaction.
Direction
Disposed (sell-side)
Shares
477
Price
$6.10
Total value
$2.9K
InsiderAmbrose Allison
RoleOfficer
CompanyUpstream Bio, Inc. (UPB)
SecurityCommon Stock
Transaction codeS: Open-market sale
Transaction dateJune 16, 2026
Filing dateJune 17, 2026
Shares owned after16,048
OwnershipDirect
10b5-1 planNo
AmendedNo
Footnotes
The Issuer has adopted a "sell-to-cover" policy to satisfy the tax withholding obligations of the Reporting Person. 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.