November 7, 2025 · Form 4 insider transaction
Rajavelu Esther sold 40,270 shares of Spero Therapeutics Inc. at $2.37 per share, a transaction worth $95.4K. The trade was recorded as open-market sale and disclosed on an SEC Form 4, filed 5 days after the transaction.
The reported transaction is a sale of common stock effected to cover tax withholding obligations pursuant to a "sell to cover" provision included in each RSU Agreement in connection with the vesting of restricted stock units ("RSUs") that were granted to the Reporting Person on November 13, 2023.