Christopher Cummiskey - 31 Jan 2026 Form 4 Insider Report for SOUTHERN CO (SO)

Role
EVP
Signature
/s/ Brittney Anderson, Attorney-in-Fact for Christopher Cummiskey
Issuer symbol
SO
Transactions as of
31 Jan 2026
Net transactions value
-$142,182
Form type
4
Filing time
03 Feb 2026, 18:31:42 UTC
Previous filing
27 May 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Cummiskey Christopher EVP 30 IVAN ALLEN JR BLVD NW, ATLANTA /s/ Brittney Anderson, Attorney-in-Fact for Christopher Cummiskey 03 Feb 2026 0001642170

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SO Southern Company Common Stock Options Exercise $0 +1,794 +8% $0.000000 24,296 31 Jan 2026 Direct F1
transaction SO Southern Company Common Stock Tax liability $67,697 -758 -3.1% $89.31 23,538 31 Jan 2026 Direct F2
transaction SO Southern Company Common Stock Options Exercise $0 +1,715 +7.3% $0.000000 25,253 01 Feb 2026 Direct F3
transaction SO Southern Company Common Stock Tax liability $74,485 -834 -3.3% $89.31 24,419 01 Feb 2026 Direct F2
holding SO Southern Company Common Stock 5,806 31 Jan 2026 401(k)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SO Performance Restricted Stock Units Options Exercise $0 -1,537 -100% $0.000000 0 01 Feb 2026 Southern Company Common Stock 1,537 $0.000000 Direct F4
transaction SO Performance Restricted Stock Units Options Exercise $0 -1,674 -50% $0.000000 1,674 31 Jan 2026 Southern Company Common Stock 167 $0.000000 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Shares acquired upon vesting of second 1/3 of performance restricted stock units granted on January 31, 2024. Includes 120 accrued dividend equivalent units.
F2 Shares withheld to satisfy required state and federal tax withholding requirements.
F3 Shares acquired upon vesting of final 1/3 of performance restricted stock units granted on February 1, 2023. Includes 178 accrued dividend equivalent units.
F4 Represents final 1/3 of performance restricted stock units granted on February 1, 2023. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.
F5 Represents second 1/3 of restricted stock units granted on January 31, 2024. The remaining award will vest in 2027. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. Additional units will be acquired with deemed dividends. Shares will be withheld upon vesting to satisfy tax requirements.