ALLIANT ENERGY CORP 8-K

What Happened

• Alliant Energy Corporation announced its operating and financial results for the fourth quarter and the full year ended December 31, 2025 in a press release issued February 19, 2026. The company filed an 8-K on February 20, 2026 to furnish that press release (Exhibit 99.1), which is incorporated by reference into the filing.

Key Details

• Press release date: February 19, 2026; 8-K filed: February 20, 2026.
• Periods covered: Fourth quarter and year ended December 31, 2025.
• Exhibit furnished: (99.1) Alliant Energy press release; (104) Cover Page Interactive Data File (iXBRL).
• Filing signed by Dylan M. Syse, Chief Accounting Officer and Controller, on behalf of Alliant Energy Corporation (and related operating subsidiaries) dated February 19, 2026.

Why It Matters

• This 8-K formally notifies investors that Alliant Energy has released its most recent quarterly and annual financial results; the press release will contain the company’s reported earnings, revenue, and other performance metrics for Q4 and full-year 2025. Retail investors should read the furnished press release (Exhibit 99.1) for the detailed numbers and any management commentary that could affect near-term valuation or outlook.