Sath Shukla - 03 Feb 2025 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Signature
/s/ Maegan Deare, Attorney-in-Fact for Sath Shukla
Issuer symbol
SPRO
Transactions as of
03 Feb 2025
Net transactions value
-$121,160
Form type
4
Filing time
05 Feb 2025, 20:31:31 UTC
Previous filing
29 Aug 2024

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SPRO Common Stock Award $0 +751,407 +66% $0.000000 1,892,216 03 Feb 2025 Direct F1
transaction SPRO Common Stock Sale $4,788 -6,139 -0.32% $0.7800 1,886,077 05 Feb 2025 Direct F2
transaction SPRO Common Stock Sale $33,373 -42,786 -2.3% $0.7800 1,843,291 05 Feb 2025 Direct F3
transaction SPRO Common Stock Sale $82,998 -106,408 -5.8% $0.7800 1,736,883 05 Feb 2025 Direct F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Consists of restricted stock units ("RSUs"). Each RSU represents the right to receive one share of common stock upon vesting. The RSUs vest in four equal annual installments beginning on February 3, 2026, subject to the Reporting Person's continued service through the applicable vesting date.
F2 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 RSUs that were granted to the Reporting Person on February 1, 2022.
F3 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 RSUs that were granted to the Reporting Person on February 1, 2023.
F4 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 RSUs that were granted to the Reporting Person on February 1, 2024.