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Spero Therapeutics, Inc.·4

Feb 9, 9:09 PM ET

Keutzer Timothy 4

Research Summary

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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.