Frank E. Thomas - Aug 17, 2021 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Role
Director
Signature
/s/ Matthew J. Gardella, as Attorney-in-Fact for Frank E. Thomas
Stock symbol
SPRO
Transactions as of
Aug 17, 2021
Transactions value $
$0
Form type
4
Date filed
8/18/2021, 04:55 PM
Previous filing
May 17, 2021
Next filing
Jan 7, 2022

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SPRO Stock Option (right to buy) Award $0 +7.5K $0.00 7.5K Aug 17, 2021 Common Stock 7.5K $13.69 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares underlying this option will vest and become exercisable in full on August 17, 2022 subject to the Reporting Person's continued service as a director through the vesting date.