Alliant Energy said it entered into an underwriting agreement with BofA Securities and other underwriters on September 23, 2025 to sell 5.750% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 in a public offering totaling $725 million.

8-KOther EventsFiled Sep 26, 2025Period of report Sep 23, 2025Summary published (UTC) Oct 16, 2026

Key points

AI summary

Alliant Energy said it entered into an underwriting agreement with BofA Securities and other underwriters on September 23, 2025 to sell 5.750% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 in a public offering totaling $725 million.
The company said the notes are due April 1, 2056, and that the closing is expected on September 26, 2025, subject to customary closing conditions.
The company said it plans to use the net proceeds from the offering to reduce outstanding commercial paper, retire long-term debt and/or for general corporate purposes.
Alliant Energy registered the notes on Form S-3 automatic shelf registration statement. It filed the Indenture and First Supplemental Indenture dated September 26, 2025, along with Perkins Coie LLP's legal and tax opinions, as exhibits to this 8-K.

Summary

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Analysis scope · Filing body and confirmed press-release exhibitWe analyzed the filing body and confirmed exhibits. This is not a review of other exhibits, investor presentations or the full earnings call.

Alliant Energy Enters $725 million 5.750% Junior Subordinated Notes Underwriting Agreement

Alliant Energy said it entered into an underwriting agreement with BofA Securities and other underwriters on September 23, 2025 to sell 5.750% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 in a public offering totaling $725 million.

Source · Based on the filing body and exhibits

Notes Maturity and Expected Closing Dates

The company said the notes are due April 1, 2056, and that the closing is expected on September 26, 2025, subject to customary closing conditions.

Source · Based on the filing body and exhibits

Use of Net Proceeds

The company said it plans to use the net proceeds from the offering to reduce outstanding commercial paper, retire long-term debt and/or for general corporate purposes.

Source · Based on the filing body and exhibits

Registration, Indenture and Legal Opinion Filings

Alliant Energy registered the notes on Form S-3 automatic shelf registration statement. It filed the Indenture and First Supplemental Indenture dated September 26, 2025, along with Perkins Coie LLP's legal and tax opinions, as exhibits to this 8-K.

Source · Based on the filing body and exhibits

AI summarized the filing and translated the summary into English; it may differ from the original. For reference only, not investment advice. AI translated the published Korean report into English. Figures are copied as filed, not recalculated.

Original filing

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