SOUTHERN CO (SO) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-07-02

SOUTHERN CO (SO) has filed 16 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-02. 2 Form 8-K material event filings were reported by SO in the last 90 days. 3 Form 144 notices of proposed sale were filed for SO stock. InsiderAlpha tracks every SO SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About SOUTHERN CO (SO)

SIC classification	Electric Services (SIC 4911)
SEC CIK	0000092122

90-Day SEC Filing Activity

Form 4 filings (90d)	16
Form 8-K filings (90d)	2
Form 144 notices (90d)	3
Latest Form 4 filing	2026-07-02

Recent SO Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-07-01	Kim Matthew M.	Comptroller	S — Open-market sale	100	$95.77	$10K	SEC
2026-06-28	Sena Peter P III	Chairman,President & CEO, SNC	F — Tax withholding / forfeiture	316	$97.16	$31K	SEC
2026-06-28	Sena Peter P III	Chairman,President & CEO, SNC	M — Option exercise	712	$0.00	—	SEC
2026-06-01	Kim Matthew M.	Comptroller	S — Open-market sale	100	$91.16	$9K	SEC
2026-05-24	WOMACK CHRISTOPHER C	Chairman, President & CEO	M — Option exercise	7.7K	$0.00	—	SEC
2026-05-24	WOMACK CHRISTOPHER C	Chairman, President & CEO	F — Tax withholding / forfeiture	3.4K	$94.55	$323K	SEC
2026-05-01	Kim Matthew M.	Comptroller	S — Open-market sale	100	$96.57	$10K	SEC
2026-04-01	Kim Matthew M.	Comptroller	M — Option exercise	82	$0.00	—	SEC
2026-04-01	Kim Matthew M.	Comptroller	F — Tax withholding / forfeiture	82	$96.94	$8K	SEC
2026-03-30	Greene Kimberly S,	Chairman, President & CEO, GPC	S — Open-market sale	25.0K	$96.67	$2.42M	SEC
2026-03-19	Cummiskey Christopher	EVP	S — Open-market sale	6.7K	$96.55	$644K	SEC
2026-03-18	Connally Stan W	EVP & COO	S — Open-market sale	12.5K	$97.13	$1.21M	SEC
2026-03-08	Drake Sloane N	EVP & CHRO	F — Tax withholding / forfeiture	633	$97.48	$62K	SEC
2026-03-08	Drake Sloane N	EVP & CHRO	M — Option exercise	1.4K	$0.00	—	SEC
2026-03-06	Spainhour Sterling A Jr.	EVP & CLO	J — Other acquisition / disposition	6.3K	$97.64	$618K	SEC

All transactions sourced from SEC EDGAR Form 4 filings for SOUTHERN CO (SO). Updated in real time as new filings are submitted to the SEC.

Most-Active SO Insiders — Last 90 Days

Insider	Form 4 filings	Total transaction value
WOMACK CHRISTOPHER C	3	$975K
Kim Matthew M.	3	$28K
Sena Peter P III	3	$31K
EARLEY ANTHONY F JR	2	$67K
JOHNS JOHN D	1	$45K

Recent SO Form 8-K Material Events

2026-06-08 — Item 8.01, 9.01 [SEC]
2026-05-15 — Item 5.07, 9.01 [SEC]
2026-03-19 — Item 8.01, 9.01 · Financing · neutral [SEC]
Southern Company entered into an underwriting agreement on March 16, 2026 to issue $1.3 billion in Series 2026A 6.00% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due April 1, 2058. This is a routine debt financing for a large utility company with established capital marke
2026-02-25 — Item 1.01, 2.03, 9.01 · Financing · positive [SEC]
Southern Company, Alabama Power, and Georgia Power entered into loan guarantee agreements with the U.S. Department of Energy under the Title XVII DOE Loan Guarantee Program on February 20, 2026. This secures federal financing for infrastructure projects, likely related to nuclear
2026-02-17 — Item 5.02 · Leadership · neutral [SEC]
This is an amended 8-K filing that adds routine committee assignments for John M. Turner, Jr., who was elected to Southern Company's Board of Directors on July 23, 2025. The amendment, filed nearly seven months later on February 16, 2026, simply reports his appointment to the Fin

Recent SO Form 144 Notices of Proposed Sale

2026-07-01 — — [SEC]
2026-06-01 — — [SEC]
2026-05-01 — — [SEC]

Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.

Recent Insider Filings

2026-07-02 — Kim Matthew M. (Comptroller)
2026-07-02 — EARLEY ANTHONY F JR (Insider)
2026-07-02 — Cooper Shantella E. (Insider)
2026-07-02 — SMITH WILLIAM G JR (Insider)
2026-07-02 — MEADOR DAVID E (Insider)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in SO insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

SO Insider Trading — FAQ

What is the latest insider trade for SO?: SOUTHERN CO (SO) had 16 insider filings in the last 90 days, with the most recent on 2026-07-02. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying SO stock?: 0 insider purchases of SO were filed in the last 90 days.
How many insiders are selling SO stock?: 0 insider sales of SO were filed in the last 90 days.
Where can I see SO SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every SO SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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