FIRST BUSINESS FINANCIAL SERVICES, INC. 8-K

What Happened

• On March 12, 2026, First Business Financial Services, Inc. (FBIZ) published a CEO letter on its Investor Relations webpage covering the year ended December 31, 2025 and related company matters. The letter is attached to the Form 8-K as Exhibit 99.1 and the content is being furnished pursuant to Regulation FD.

Key Details

• Filing date: March 12, 2026.
• Period covered: year ended December 31, 2025.
• Document: CEO letter posted to the company’s Investor Relations site and furnished as Exhibit 99.1 to the Form 8-K.
• Signature: Form 8-K signed by Brian D. Spielmann, Chief Financial Officer.

Why It Matters

• The CEO letter provides management commentary on the company’s 2025 performance and related matters; it is a public, Reg FD-furnished communication intended for all investors.
• This 8-K does not itself present audited financial statements or an official earnings release; investors seeking revenue, earnings or quarterly results should consult the company’s earnings releases and SEC financial filings for numeric details.
• Reading the CEO letter can give investors context on strategy, results interpretation and management priorities for 2026, but should be considered alongside formal financial disclosures.