---
schema_version: "secwatch.filing_event.v1"
accession: "0000352541-25-000076"
form_type: "8-K"
ticker: "LNT"
cik: "0000352541"
company_name: "ALLIANT ENERGY CORP"
filed_at: "2025-09-26T23:59:59+00:00"
generated_at: "2026-05-17T05:37:41.883500+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Alliant Energy prices $725M of 5.750% junior subordinated notes due 2056

## Summary
- $725M principal of 5.750% junior subordinated notes due Apr 1, 2056 priced.
- Net proceeds to reduce commercial paper, retire long-term debt, or general corporate purposes.
- Closing expected Sept 26, 2025, subject to customary conditions.
- Underwriters: BofA, MUFG, Barclays, Goldman Sachs, J.P. Morgan, Mizuho, Wells Fargo.
- Notes are Fixed-to-Fixed Reset Rate junior subordinated; registered under shelf S-3.

## SEC filing metadata
- accession: 0000352541-25-000076
- form_type: 8-K
- ticker: LNT
- cik: 0000352541
- company_name: ALLIANT ENERGY CORP
- filed_at: 2025-09-26T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/352541/000035254125000076/0000352541-25-000076-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/352541/000035254125000076/lnt-20250923.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000352541-25-000076
- JSON: https://secwatch.observer/filing/0000352541-25-000076.json
- Plain text: https://secwatch.observer/filing/0000352541-25-000076.txt

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