FRANK E. THOMAS - 12 Jun 2025 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Role
Director
Signature
/s/ Maegan Deare, Attorney-in-Fact for Frank E. Thomas
Issuer symbol
SPRO
Transactions as of
12 Jun 2025
Net transactions value
$0
Form type
4
Filing time
16 Jun 2025, 20:24:33 UTC
Previous filing
14 May 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
THOMAS FRANK E Director C/O SPERO THERAPEUTICS, INC., 675 MASSACHUSETTS AVENUE, 14TH FLOOR, CAMBRIDGE /s/ Maegan Deare, Attorney-in-Fact for Frank E. Thomas 12 Jun 2025 0001242616

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SPRO Common Stock Award $0 +20,000 +36% $0.000000 75,000 12 Jun 2025 Direct F1
* 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 on June 12, 2026, subject to the Reporting Person's continued service through the applicable vesting date.