Deykin Aaron sold UPB
June 16, 2026 · Form 4 insider transaction
Deykin Aaron sold 895 shares of Upstream Bio, Inc. at $6.10 per share, a transaction worth $5.5K. The trade was recorded as open-market sale and disclosed on an SEC Form 4, filed 1 day after the transaction.
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.; Includes 1,405 shares of Common Stock previously acquired under the Issuer's 2024 Employee Stock Purchase Plan.