---
schema_version: "secwatch.filing_event.v1"
accession: "0000092122-25-000052"
form_type: "8-K"
ticker: "SO"
cik: "0000092122"
company_name: "SOUTHERN CO"
filed_at: "2025-05-21T23:59:59+00:00"
generated_at: "2026-05-20T23:26:10.868687+00:00"
event_type: "debt"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Southern Company prices $1.45B 3.25% convertible notes due 2028; upsized by $200M

## Summary
- $1.45B aggregate principal of 3.25% Convertible Senior Notes due June 15, 2028, upsized $200M from prior announcement.
- Initial conversion price ~$113.54/share, representing a ~25% premium over May 20 closing price of common stock.
- Net proceeds ~$1.44B; $1.25B used to repurchase ~$781.6M of Series 2023A and ~$328.1M of Series 2024A convertible notes.
- Remaining proceeds to repay commercial paper and for general corporate purposes.
- Closing expected May 23, 2025; initial purchasers have 13-day option for additional $200M of notes.

## SEC filing metadata
- accession: 0000092122-25-000052
- form_type: 8-K
- ticker: SO
- cik: 0000092122
- company_name: SOUTHERN CO
- filed_at: 2025-05-21T23:59:59+00:00
- event_type: debt
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/92122/000009212225000052/0000092122-25-000052-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/92122/000009212225000052/so-20250520.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000092122-25-000052
- JSON: https://secwatch.observer/filing/0000092122-25-000052.json
- Plain text: https://secwatch.observer/filing/0000092122-25-000052.txt

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