Tamara L. Joseph - 01 Feb 2024 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Signature
/s/ Tamara Joseph
Issuer symbol
SPRO
Transactions as of
01 Feb 2024
Net transactions value
-$42,341
Form type
4
Filing time
05 Feb 2024, 20:48:40 UTC
Previous filing
30 Aug 2023

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SPRO Common Stock Award $0 +239,731 +74% $0.000000 562,521 01 Feb 2024 Direct F1
transaction SPRO Common Stock Sale $42,341 -30,906 -5.5% $1.37 531,615 02 Feb 2024 Direct F2, F3
* 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 1, 2025, 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 in connection with the vesting of RSUs that were granted to the Reporting Person on February 1, 2022 and February 1, 2023 pursuant to a "sell to cover" provision included in each RSU Agreement.
F3 Represents the weighted average sales price per share. The shares sold at prices ranging from $1.36 to $1.42 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.