Scott Thomas Jackson - 12 Jun 2025 Form 4 Insider Report for Spero Therapeutics, Inc. (SPRO)

Reporting relationship: Director
Issuer ticker: SPRO
Reported as of: 12 Jun 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 16 Jun 2025, 20:29:35 UTC
Prior SEC filing: 13 Jun 2025
Next SEC filing: 05 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Maegan Deare, Attorney-in-Fact for Scott Thomas Jackson

Key filing fact

Scott Thomas Jackson filed Form 4 for Spero Therapeutics, Inc. (SPRO) on 16 Jun 2025.

Key facts

This page summarizes Scott Thomas Jackson's Form 4 filing for Spero Therapeutics, Inc. (SPRO).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 16 Jun 2025, 20:29.

Change

Previous filing in this sequence was filed on 13 Jun 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001566617 Primary reporting owner

Jackson Scott Thomas

Relationship: Director
Address: C/O SPERO THERAPEUTICS, INC., 675 MASSACHUSETTS AVENUE, 14TH FLOOR, CAMBRIDGE
Signature: /s/ Maegan Deare, Attorney-in-Fact for Scott Thomas Jackson
Signature date: 12 Jun 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SPRO transaction

Common Stock

Award

Transaction value: $0
Shares: +20,000
Change %: +36%
Price: $0.000000
Shares after: 75,000
Date: 12 Jun 2025
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote 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.