Southern Company (SO) SEC Filings

Browse all Southern Company SEC filings, including Annual reports (10-K), Quarterly reports (10-Q), 8-K, proxy statements (DEF 14A), and insider filings (Form 4). Access official documents by filing date, reporting period, and form type. ...more

Southern Company Reports: Annual 10-K, Quarterly 10-Q & SEC Filings

SEC Filings

Date

4

Insider ownership (buying, selling) activity

Jun 29, 2026

11-K

Annual performance report of employee stock plans

Jun 26, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Jun 8, 2026

424B2

Prospectus variant for specific offering structures

Jun 8, 2026

S-3ASR

Automatic shelf registration for eligible issuers

Jun 5, 2026

4

Insider ownership (buying, selling) activity

Jun 1, 2026

4

Insider ownership (buying, selling) activity

May 26, 2026

SD

Specialized disclosure report (e.g., conflict minerals)

May 20, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

May 15, 2026

SC 13G

Passive large shareholder ownership disclosure

May 14, 2026

DEFA14A

Additional or supplemental proxy disclosures

May 5, 2026

4

Insider ownership (buying, selling) activity

May 4, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Apr 30, 2026

SC 13G

Passive large shareholder ownership disclosure

Apr 30, 2026

DEF 14A

Final shareholder voting details (board elections and executive pay)

Apr 3, 2026

DEFA14A

Additional or supplemental proxy disclosures

Apr 3, 2026

ARS

Annual Report to Shareholders

Apr 3, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Apr 2, 2026

4

Insider ownership (buying, selling) activity

Mar 31, 2026

SC 13G/A

Updated passive ownership disclosure

Mar 27, 2026

PRE 14A

Preliminary proxy statement filed for SEC review

Mar 23, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Mar 19, 2026

4

Insider ownership (buying, selling) activity

Mar 19, 2026

4

Insider ownership (buying, selling) activity

Mar 19, 2026

424B2

Prospectus variant for specific offering structures

Mar 17, 2026

424B5

Shelf offering prospectus with final pricing terms

Mar 16, 2026

FWP

Free writing prospectus related to a securities offering

Mar 16, 2026

Southern Company (Form 4) 2026

Insider Trades / Insider ownership (buying, selling) activity

Jun 29, 2026

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