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Alliant Energy 8-K Report, Corporate Update (Aug 21, 2026)

Reports
Other Events·Exhibits & Filings
Filing Date
Filed August 21, 2026
Period End
August 21, 2026
Security
LNT
In the record · 2016–202610-K1110-Q338-K136

LNT filed 11 annual reports (10-K), 33 quarterly reports (10-Q) and 136 current reports (8-K) between 2016 and 2026.

  1. Material agreement8-K · Oct ’16Oct ’16
  2. Leadership change8-K · Feb ’19Feb ’19
  3. Leadership change8-K · Jul ’21Jul ’21
  4. Material agreement8-K · May ’25May ’25

01—Abstract

Summary

Summary of the 8-K filed August 21, 2026. Cited figures are marked; the original filing is the authoritative source.

Interstate Power and Light Company (IPL), a wholly owned subsidiary of Alliant Energy Corporation (NASDAQ: LNT), entered into an Underwriting Agreement dated August 18, 2026 with Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC, as representatives of the underwriters, to sell $500 milliona aggregate principal amount of its 5.100% Senior Debentures due 2031 in a public offering.

The offering is expected to close on August 21, 2026, subject to customary closing conditions. The debentures are being issued under a 2003 indenture with The Bank of New York Mellon Trust Company, N.A., as successor trustee, and are registered under an automatic shelf registration statement on Form S-3 filed December 15, 2023. IPL's press release announcing pricing states the debentures will be due September 30, 2031, and that net proceeds are intended to reduce outstanding capital under its receivables purchase and sale program, reduce outstanding commercial paper, and/or fund general corporate purposes.

This filing is primarily a procedural 8-K that files the underwriting agreement, officer's certificate, legal opinions, and pricing press release as exhibits to the registration statement. For investors, the filing is a routine debt financing by a regulated utility subsidiary, with the key terms being the $500 millionb size, the 5.100% coupon, the 2031 maturity, and a stated use of proceeds aimed at reducing short-term funding obligations and general corporate needs.

02—Key points

Key Highlights

  1. IPL priced a $500 million public offering of 5.100% Senior Debentures due 2031, with pricing announced August 18, 2026.
  2. The debentures are scheduled to mature September 30, 2031, per the pricing press release.
  3. Closing is expected on August 21, 2026, subject to customary closing conditions.
  4. Net proceeds are intended to reduce outstanding capital under IPL's receivables purchase and sale program, reduce outstanding commercial paper, and/or for general corporate purposes.
  5. The offering is underwritten by Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC as representatives, with Academy Securities, Fifth Third Securities, KeyBanc Capital Markets, and TD Securities (USA) as co-managers.
  6. The debentures are issued under a 2003 indenture with The Bank of New York Mellon Trust Company, N.A., as successor trustee, and registered on automatic shelf Form S-3 No. 333-276062-01.
  7. Legal opinions from Ashurst Perkins Coie US LLP and Simmons Perrine PLC (Iowa counsel), both dated August 21, 2026, were filed as exhibits.

03—Questions

Frequently Asked Questions

  1. What did Interstate Power and Light Company agree to do?

    IPL agreed to sell $500 million aggregate principal amount of its 5.100% Senior Debentures due 2031 in a public offering to the underwriters under an Underwriting Agreement dated August 18, 2026.

  2. When do the debentures mature and when is the offering expected to close?

    The senior debentures are due September 30, 2031, according to the pricing press release. The offering is expected to close on August 21, 2026, subject to customary closing conditions.

  3. How will IPL use the proceeds from the offering?

    IPL intends to use the net proceeds to reduce outstanding capital under its receivables purchase and sale program, reduce outstanding commercial paper, and/or for general corporate purposes.

  4. Under what registration and indenture were the debentures issued?

    The debentures are registered under an automatic shelf registration statement on Form S-3 (Registration No. 333-276062-01) filed December 15, 2023, and are issued under an Indenture dated August 20, 2003, with The Bank of New York Mellon Trust Company, N.A., as successor trustee, pursuant to an Officer's Certificate dated August 21, 2026.

  5. Who are the underwriters for the offering?

    Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC are the joint book-running managers. Academy Securities, Inc., Fifth Third Securities, Inc., KeyBanc Capital Markets Inc., and TD Securities (USA) LLC are co-managers.

04—Continue

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