Alliant Energy Corporation filed a combined current report on October 29, 2026, announcing its financial results for the three and nine months ended September 30, 2026, with a press release furnished as an exhibit.

Key Highlights

  • Three registrants covered: The filing was made jointly by Alliant Energy Corporation, Interstate Power and Light Company, and Wisconsin Power and Light Company.
  • Reporting period: Financial results cover the three and nine months ended September 30, 2026.
  • Exchange listing: Alliant Energy Corporation common stock, $0.01 par value, trades on the Nasdaq Global Select Market under the symbol LNT (NASDAQ:LNT).
  • Press release furnished: The financial results press release dated October 29, 2026, is attached as Exhibit 99.1 and incorporated by reference.
  • Signed by: Dylan M. Syse, Chief Accounting Officer and Controller, signed on behalf of all three registrant entities.

Alliant Energy and Its Subsidiaries Report Third-Quarter 2026 Operating Results

According to the filing, Alliant Energy Corporation, a Wisconsin corporation headquartered at 4902 N. Biltmore Lane, Madison, Wisconsin, issued a press release on October 29, 2026, disclosing its financial results for the three and nine months ended September 30, 2026. Alliant Energy operates through two regulated utility subsidiaries: Interstate Power and Light Company, an Iowa corporation based in Cedar Rapids, Iowa, and Wisconsin Power and Light Company, a Wisconsin corporation. All three entities jointly filed this combined report.

The filing was made under Item 2.02, Results of Operations and Financial Condition, of the current report form. The press release containing the actual financial figures is furnished as Exhibit 99.1 and is incorporated by reference into the filing. The Cover Page Interactive Data File, embedded within the Inline XBRL document, is listed as Exhibit 104. The filing noted that none of the three companies qualify as an emerging growth company as defined under the relevant provisions of the Securities Act of 1933 and the Securities Exchange Act of 1934.

Dylan M. Syse, identified in the filing as Chief Accounting Officer and Controller, signed the report on behalf of all three registrants on October 29, 2026. Alliant Energy Corporation's common stock carries a par value of $0.01 per share and is registered under Section 12(b) of the Act, trading on the Nasdaq Global Select Market under the ticker symbol LNT.

What Was Disclosed

Alliant Energy Corporation, together with its subsidiaries Interstate Power and Light Company and Wisconsin Power and Light Company, filed a combined current report on October 29, 2026, announcing third-quarter 2026 financial results via a furnished press release covering the period ended September 30, 2026.