---
schema_version: "secwatch.filing_event.v1"
accession: "0000092122-25-000028"
form_type: "8-K"
ticker: "SO"
cik: "0000092122"
company_name: "SOUTHERN CO"
filed_at: "2025-02-28T23:59:59+00:00"
generated_at: "2026-05-26T00:50:54.892281+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Southern Company issues $1.8B of 6.375% junior subordinated notes due 2055

## Summary
- Issued $1.8B aggregate principal of Series 2025B 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due March 15, 2055.
- Underwriting agreement dated Feb 25, 2025 with Barclays, Citigroup, Mizuho, MUFG, PNC, Truist as representatives.
- Notes are junior subordinated obligations; coupon resets after initial fixed period.
- Registered under shelf registration statement No. 333-277138.

## SEC filing metadata
- accession: 0000092122-25-000028
- form_type: 8-K
- ticker: SO
- cik: 0000092122
- company_name: SOUTHERN CO
- filed_at: 2025-02-28T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/92122/000009212225000028/0000092122-25-000028-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/92122/000009212225000028/so-20250225.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000092122-25-000028
- JSON: https://secwatch.observer/filing/0000092122-25-000028.json
- Plain text: https://secwatch.observer/filing/0000092122-25-000028.txt

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