TAMARA L. JOSEPH - 01 Feb 2023 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Signature
/s/ Tamara Joseph
Issuer symbol
SPRO
Transactions as of
01 Feb 2023
Net transactions value
-$6,313
Form type
4
Filing time
03 Feb 2023, 18:43:02 UTC
Previous filing
03 Feb 2022
Next 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 +265,957 +428% $0.000000 328,038 01 Feb 2023 Direct F1, F2
transaction SPRO Common Stock Sale $6,313 -3,394 -1% $1.86 324,644 02 Feb 2023 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, 2024, subject to the Reporting Person's continued service through the applicable vesting date.
F2 Includes 312,518 RSUs held by the Reporting Person.
F3 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 pursuant to a "sell to cover" provision included in the RSU Agreement.