Zack Debra bought SPRO
August 3, 2026 · Form 4 insider transaction
Zack Debra bought 324,675 shares of Spero Therapeutics, Inc. at $0.00 per share, a transaction worth N/A. The trade was recorded as grant or award and disclosed on an SEC Form 4, filed 3 days after the transaction.
Direction
Acquired (buy-side)
Shares
324,675
Price
$0.00
Total value
N/A
InsiderZack Debra
RoleOfficer
SecurityStock option (right to buy)
Transaction codeA: Grant or award
Transaction dateAugust 3, 2026
Filing dateAugust 6, 2026
Shares owned after324,675
OwnershipDirect
10b5-1 planNo
AmendedNo
Footnotes
The shares underlying this option vest as to 25% on August 3, 2027, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.