Southern Co.

SO·NYSE·$94.09Share Price as of 11/2·$106BMarket Cap as of 11/2

Financials

10-KFY 202502/19/26 10-QQ3 ended 09/30/2510/30/25 10-QQuarterly Report07/31/25 10-QQuarterly Report05/01/25 10-QQ3 ended 09/30/2410/31/24

Disclosures

8-KCurrent report10/22/26 8-KCurrent report08/06/26 8-KCurrent report08/04/26 8-KCurrent report08/03/26 8-KCurrent report06/08/26

Prospectuses and Registrations

424B2Prospectus for primary offering06/08/26 S-3ASRAutomatic shelf registration06/05/26 424B2Prospectus for primary offering03/17/26 424B5Prospectus supplement03/16/26 FWPFree writing prospectus03/16/26

Proxies

DEFA14AAdditional proxy materials05/05/26 DEF 14ADefinitive proxy04/03/26 DEFA14AAdditional proxy materials04/03/26 PRE 14APreliminary proxy03/23/26 PX14A6GLetter to shareholders05/20/25

Ownership

Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26

Other

11-KEmployee stock purchase plan report06/26/26 SDConflict Minerals disclosure05/20/26 ARSAnnual report to shareholders04/03/26 CERTCEO/CFO certification11/07/25 8-A12B8-A12B11/06/25