---
schema_version: "secwatch.filing_event.v1"
accession: "0000092122-26-000018"
form_type: "8-K"
ticker: "SO"
cik: "0000092122"
company_name: "SOUTHERN CO"
filed_at: "2026-03-19T23:59:59+00:00"
generated_at: "2026-05-15T09:48:00.025703+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Southern Company issues $1.3B of 6.00% junior subordinated notes due 2058

## Summary
- Issued $1.3B aggregate principal of Series 2026A 6.00% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due April 1, 2058.
- Underwriting agreement signed March 16, 2026, with Citigroup, J.P. Morgan, Mizuho, Morgan Stanley, and U.S. Bancorp as representatives.
- Notes are registered under the existing shelf registration statement (No. 333-277138).

## SEC filing metadata
- accession: 0000092122-26-000018
- form_type: 8-K
- ticker: SO
- cik: 0000092122
- company_name: SOUTHERN CO
- filed_at: 2026-03-19T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/92122/000009212226000018/0000092122-26-000018-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/92122/000009212226000018/so-20260316.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000092122-26-000018
- JSON: https://secwatch.observer/filing/0000092122-26-000018.json
- Plain text: https://secwatch.observer/filing/0000092122-26-000018.txt

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