---
schema_version: "secwatch.filing_event.v1"
accession: "0000352541-23-000028"
form_type: "8-K"
ticker: "LNT"
cik: "0000352541"
company_name: "ALLIANT ENERGY CORP"
filed_at: "2023-03-03T23:59:59+00:00"
generated_at: "2026-06-18T13:42:53.815147+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Alliant Energy closes $500M 3.875% convertible note offering due 2026

## Summary
- Issued $500M aggregate principal of 3.875% Convertible Senior Notes due March 15, 2026.
- Initial conversion price of $64.32/share, a 25% premium over Feb 27, 2023 closing price.
- Net proceeds of ~$490.9M (or ~$564.6M if $75M greenshoe option fully exercised).
- Proceeds to be used for general corporate purposes, including debt repayment and capex.
- Notes are senior unsecured, convertible into cash/stock at Alliant's election.

## SEC filing metadata
- accession: 0000352541-23-000028
- form_type: 8-K
- ticker: LNT
- cik: 0000352541
- company_name: ALLIANT ENERGY CORP
- filed_at: 2023-03-03T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 2.03, 3.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/lnt-20230227.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000352541-23-000028
- JSON: https://secwatch.observer/filing/0000352541-23-000028.json
- Plain text: https://secwatch.observer/filing/0000352541-23-000028.txt

## Key facts
- Debt Financings
  ALLIANT ENERGY CORP incurred convertible notes of $500 million aggregate principal amount with The Bank of New York Mellon Trust Company, N.A. at 3.875% per year maturing March 15, 2026.
  - Instrument: convertible notes
  - Principal: $500 million aggregate principal amount
  - Counterparty: The Bank of New York Mellon Trust Company, N.A.
  - Rate: 3.875% per year
  - Maturity: March 15, 2026
  - Event: incurrence
  source text: On March 2, 2023, Alliant Energy Corporation (the “ Company ”) completed its previously announced sale of $500 million aggregate principal amount of 3.875% Convertible Senior Notes due 2026 (the “ Notes ”) in a private offering to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “ Securities Act ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm
- Material Agreements
  ALLIANT ENERGY CORP entered into Indenture with The Bank of New York Mellon Trust Company, N.A., as trustee valued at $500 million (effective 2023-03-02).
  - Action: entry
  - Agreement: notes offering
  - Counterparty: The Bank of New York Mellon Trust Company, N.A., as trustee
  - Value: $500 million
  - Effective: 2023-03-02
  source text: On March 2, 2023, Alliant Energy Corporation (the “ Company ”) completed its previously announced sale of $500 million aggregate principal amount of 3.875% Convertible Senior Notes due 2026 (the “ Notes ”) in a private offering to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “ Securities Act ”). In addition, each of the initial purchasers has an option to purchase, within a 13-day period from, and including, the date on which the Notes are first issued, up to an additional $75 million aggregate principal amount of the Notes. The Notes bear interest at a fixed rate of 3.875% per year, payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2023. The Notes will be convertible into cash or a combination of cash and shares of the Company’s common stock, $0.01 par value per share (“ Common Stock ”), as described below. The Notes are senior, unsecured obli
  evidence_url: https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.