Keutzer Timothy 4
4 · Spero Therapeutics, Inc. · Filed Feb 9, 2026
Research Summary
AI-generated summary of this filing
Spero Therapeutics (SPRO) COO Timothy Keutzer Sells Shares
What Happened
Timothy Keutzer, Chief Operating Officer of Spero Therapeutics (SPRO), disposed of 18,652 shares on Feb 6, 2026. The shares were sold at $2.36 each for a total of $44,019. This was a sale (not a purchase) and—per the filing footnote—was an automatic sell-to-cover tied to RSU vesting rather than a discretionary trade.
Key Details
- Transaction date and price: 2026-02-06 at $2.36 per share.
- Shares sold/disposed: 18,652 shares; proceeds $44,019.
- Transaction type/code: Sale (S); footnote indicates tax-withholding sell-to-cover (F1).
- Footnote F1: Sale was required to satisfy tax withholding on vested RSUs and occurred automatically; not a discretionary sale by the reporting person.
- Shares owned after transaction: Not specified in the information provided.
- Filing: Reported on 2026-02-09 (appears to be timely filed).
Context
A sell-to-cover is a routine, automatic transaction used to pay taxes when restricted stock units vest. Because the filing explicitly states this was to cover tax withholding, it should not be interpreted as an intentional market-timing decision by the insider.
Insider Transaction Report
Form 4
Keutzer Timothy
Chief Operating Officer
Transactions
- Sale
Common Stock
[F1]2026-02-06$2.36/sh−18,652$44,019→ 742,506 total
Footnotes (1)
- [F1]Represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. The sale occurred automatically to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.
Signature
/s/ Maegan Deare, Attorney-in-Fact for Timothy Keutzer|2026-02-09