What is the primary purpose of this 8-K filing?

The primary purpose of this 8-K filing is to publicly disclose an adjustment to the conversion rate of Southern Company's Series 2023A 3.875% Convertible Senior Notes due December 15, 2025, in compliance with Regulation FD.

What are the Series 2023A Convertible Senior Notes?

These are convertible senior notes issued by Southern Company with a coupon rate of 3.875% and a maturity date of December 15, 2025. The adjustment announced affects the terms under which these notes can be converted into shares of Southern Company's common stock.

Where can investors find more details about this conversion rate adjustment?

Investors can find the detailed notice of the adjustment as Exhibit 99.1 attached to this Form 8-K filing. Additionally, Southern Company intends to post this and future conversion rate adjustments on the fixed income section of its investor relations website under the 'Additional Information' heading.

Does this filing indicate any specific financial impact or reasons for the adjustment?

This filing itself, as a Regulation FD disclosure concerning a conversion rate adjustment, does not explicitly detail the reasons for the adjustment or its immediate financial impact on Southern Company. The provided text focuses on the disclosure itself and the company's communication strategy for future adjustments.

SOUTHERN CO 8-K: Regulation FD

Summary

Southern Company (SO) has filed an 8-K report on September 15, 2025, disclosing an adjustment to the conversion rate of its Series 2023A 3.875% Convertible Senior Notes due December 15, 2025. This adjustment, detailed in Exhibit 99.1, is a regulatory disclosure under Item 7.01. The company also indicated its intention to use its investor relations website to post future conversion rate adjustments for this and other series of convertible notes, including Series 2024A and Series 2025A, and any future convertible debt issuances.

Key Highlights

1Southern Company (SO) announced an adjustment to the conversion rate of its Series 2023A 3.875% Convertible Senior Notes.
2The adjustment pertains to the notes maturing on December 15, 2025.
3This information is a Regulation FD disclosure, ensuring material information is made public.
4The full notice of the adjustment is available as Exhibit 99.1 to the 8-K filing.
5SO plans to post future conversion rate adjustments on its investor relations website for multiple series of convertible notes.
6This includes Series 2024A and Series 2025A convertible notes, and any future convertible debt.

SOUTHERN CO 8-K Report, Regulation FD Disclosure (Sep 15, 2025)

Summary

Key Highlights

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