February 3, 2026 · Form 4 insider transaction
Keutzer Timothy sold 24,224 shares of Spero Therapeutics Inc. at $2.14 per share, a transaction worth $51.8K. The trade was recorded as open-market sale and disclosed on an SEC Form 4, filed 2 days after the transaction.
Represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. The sale occurred automatically to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.