CHAMBAS COREY A 4

What Happened

• Corey A. Chambas, CEO and Director of First Business Financial Services, received 10,370 shares upon vesting of performance restricted stock units (PRSUs) for the 2023–2025 performance period. The award was recorded at $0.00 per share.
• To cover tax withholding on the vesting, 4,875 of those shares were surrendered/disposed at $58.60 per share, resulting in shares withheld valued at $285,675. This was not an open-market sale but a tax-withholding disposition.

Key Details

• Transaction dates: 2026-04-10 (award vesting and shares withheld for taxes). Form filed 2026-04-14.
• Transaction codes: A = Award/Grant (10,370 shares at $0.00); F = Payment of tax liability via share withholding (4,875 shares at $58.60, $285,675).
• Footnote: Issuance of common stock upon vesting of Performance Restricted Stock Unit awards for the 2023–2025 performance period.
• Shares owned after the transaction: Not specified in the provided filing.
• Filing timeliness: The Form 4 was filed four days after the transaction (filed 4/14/2026 for a 4/10/2026 transaction). Form 4s are generally due within two business days, so this filing appears later than the typical reporting window.

Context

• This was a vesting event with shares withheld to satisfy tax obligations (a common, administrative action), not an open-market sale that would indicate active divestment.
• For retail investors, such withholding is routine following RSU/PRSU vesting and shouldn’t be taken alone as a bullish or bearish signal about the insider’s view.