Matthew M. Kim - 31 Jan 2026 Form 4 Insider Report for SOUTHERN CO (SO)

Role
Comptroller
Signature
/s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim
Issuer symbol
SO
Transactions as of
31 Jan 2026
Net transactions value
-$30,633
Form type
4
Filing time
03 Feb 2026, 18:00:25 UTC
Previous filing
22 Aug 2025
Next filing
09 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Kim Matthew M. Comptroller 30 IVAN ALLEN JR. BLVD., NW, ATLANTA /s/ Brittney Anderson, Attorney-in-Fact for Matthew M. Kim 03 Feb 2026 0002082705

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SO Southern Company Common Stock Options Exercise $0 +340 +3.7% $0.000000 9,427 31 Jan 2026 Direct F1
transaction SO Southern Company Common Stock Tax liability $15,183 -170 -1.8% $89.31 9,257 31 Jan 2026 Direct F2
transaction SO Southern Company Common Stock Options Exercise $0 +345 +3.7% $0.000000 9,602 01 Feb 2026 Direct F3
transaction SO Southern Company Common Stock Tax liability $15,451 -173 -1.8% $89.31 9,429 01 Feb 2026 Direct F2
holding SO Southern Company Common Stock 1,193 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 Southern Co Restricted Stock Units Options Exercise $0 -317 -50% $0.000000 318 31 Jan 2026 Southern Company Common Stock 317 $0.000000 Direct F4
transaction SO Southern Co Restricted Stock Units Options Exercise $0 -308 -100% $0.000000 0 01 Feb 2026 Southern Company Common Stock 308 $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 restricted stock units granted on January 31, 2024. Includes 23 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 37 accrued dividend equivalent units.
F4 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.
F5 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.