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$SPRO All transactions

Spero Therapeutics, Inc.

▼ SELL

$ Value

$8K

Shares

3,471

Price

$2

Filed

Feb 5

Insider

Name

Keutzer Timothy

Title

Chief Operating Officer

CIK

0001798155

Roles

Officer

Transaction Details

Transaction Date

2026-02-04

Code

S

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

761,158

Footnotes

Consists of restricted stock units ("RSUs") granted to Reporting Person under Issuer's 2017 Stock Incentive Plan. 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 2, 2027, subject to the Reporting Person's continued service through the applicable vesting date. | 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. | The shares underlying this option vest as to 25% on February 2, 2027, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.

Filing Info

Accession No.

0001193125-26-038441

Form Type

4

Issuer CIK

0001701108

Keutzer Timothy's History

Date Ticker Type Value
2026-02-06 SPRO $44K
2026-02-04 SPRO $8K
2026-02-03 SPRO $52K
2026-02-02 SPRO A $0
2026-02-02 SPRO $42K
2026-02-02 SPRO A $0
2025-08-28 SPRO $3K

Other Insiders at SPRO (90d)

Insider Bought Sold Last
Keutzer Timothy
Chief Operating Officer
$137K 2026-02-06
Rajavelu Esther
See Remarks
$248K 2026-02-06