SOSouthern Company
- Employees
- 29,800
- Headquarters
- Atlanta, GA
- CEO
- Christopher C. Womack
- Next results
- around Feb 18, 2027
What SO's directors and officers said they would sell, before they sold: trading plans the company reports each quarter, and the Form 144 notices sellers file on the day of a planned sale. Facts only; most of these sales are routine, such as selling shares from vesting stock awards.
Trading plans adopted or ended
8 plans still running: Christopher Cummiskey, Bryan D. Anderson, Peter P. Sena III, Kimberly S. Greene, Matthew M. Kim, Sterling A. Spainhour, Stanley W. Connally, Jr..
| Insider | What | Date | Shares | Runs to | Reported in |
|---|---|---|---|---|---|
| Christopher Cummiskey Executive Vice President |
Adopted 10b5-1 plan | Aug 13, 2026 | up to 8,231 | Jun 1, 2027 | 10-Q Nov 5, 2026 |
| Bryan D. Anderson Executive Vice President |
Adopted 10b5-1 plan | Aug 10, 2026 | up to 10,639 | Dec 8, 2027 | 10-Q Nov 5, 2026 |
| Peter P. Sena III Chairman, President, and Chief Executive Officer of Southern Nuclear |
Adopted 10b5-1 plan | May 5, 2026 | up to 4,266 | Sep 1, 2027 | 10-Q Jul 30, 2026 |
| Kimberly S. Greene Chairman, President, and Chief Executive Officer of Georgia Power |
Adopted 10b5-1 plan | Nov 26, 2025 | up to 65,000 | Mar 30, 2027 | 10-K Feb 19, 2026 |
| Matthew M. Kim Comptroller |
Adopted 10b5-1 plan | Nov 25, 2025 | up to 6,353 | Feb 24, 2027 | 10-K Feb 19, 2026 |
| Sterling A. Spainhour Executive Vice President and Chief Legal Officer |
Adopted 10b5-1 plan | Nov 25, 2025 | up to 9,443 | Sep 1, 2027 | 10-K Feb 19, 2026 |
| Christopher Cummiskey Executive Vice President |
Adopted 10b5-1 plan | Nov 18, 2025 | up to 8,954 | Mar 9, 2027 | 10-K Feb 19, 2026 |
| Stanley W. Connally, Jr. Executive Vice President and Chief Operating Officer |
Adopted 10b5-1 plan | Nov 17, 2025 | up to 12,500 | Mar 16, 2027 | 10-K Feb 19, 2026 |
| Bryan D. Anderson Executive Vice President |
Adopted 10b5-1 plan | May 30, 2025 | up to 6,206 | Sep 30, 2026 | 10-Q Jul 31, 2025 |
The company's descriptionName Title Date of Adoption Expiration Date Aggregate Number of Shares Covered Bryan D. Anderson Executive Vice President May 30, 2025 September 30, 2026 6,206 | |||||
| Christopher Cummiskey Executive Vice President |
Adopted 10b5-1 plan | Feb 21, 2025 | up to 12,335 | Jun 25, 2026 | 10-Q May 1, 2025 |
The company's descriptionName Title Date of Adoption Expiration Date Aggregate Number of Shares Covered Christopher Cummiskey Executive Vice President February 21, 2025 June 25, 2026 12,335 | |||||
| Stanley W. Connally, Jr. Executive Vice President and Chief Operating Officer |
Adopted 10b5-1 plan | Nov 12, 2024 | up to 12,500 | Mar 17, 2026 | 10-K Feb 20, 2025 |
| Kimberly S. Greene Chairman, President, and Chief Executive Officer, Georgia Power |
Adopted 10b5-1 plan | Nov 4, 2024 | up to 45,348 | Mar 3, 2026 | 10-K Feb 20, 2025 |
| Christopher C. Womack Chairman, President, and Chief Executive Officer |
Adopted 10b5-1 plan | Sep 5, 2024 | up to 40,000 | Dec 31, 2025 | 10-Q Oct 31, 2024 |
| J. Jeffrey Peoples Chairman, President, and Chief Executive Officer of Alabama Power |
Adopted 10b5-1 plan | Sep 5, 2024 | up to 15,625 | Dec 31, 2025 | 10-Q Oct 31, 2024 |
| Martin B. Davis Executive Vice President |
Adopted 10b5-1 plan | Aug 6, 2024 | up to 8,000 | Dec 31, 2025 | 10-Q Oct 31, 2024 |
| James Y. Kerr II Chairman, President, and Chief Executive Officer of Southern Company Gas |
Adopted 10b5-1 plan | Jun 5, 2024 | up to 30,000 | Oct 10, 2025 | 10-Q Aug 1, 2024 |
| Bryan D. Anderson Executive Vice President |
Adopted 10b5-1 plan | May 8, 2024 | up to 6,565 | Aug 29, 2025 | 10-Q Aug 1, 2024 |
| Anthony L. Wilson Chairman, President, and Chief Executive Officer of Mississippi Power |
Adopted plan | Mar 6, 2024 | up to 6,900 | 488 days | 10-Q May 2, 2024 |
| Sterling A. Spainhour Executive Vice President and Chief Legal Officer |
Adopted plan | Mar 6, 2024 | up to 5,553 | 548 days | 10-Q May 2, 2024 |
| Sloane N. Drake Executive Vice President and Chief Human Resources Officer |
Adopted plan | Mar 4, 2024 | up to 12,000 | 484 days | 10-Q May 2, 2024 |
| Christopher Cummiskey Executive Vice President |
Adopted plan | Feb 26, 2024 | up to 3,248 | 708 days | 10-Q May 2, 2024 |
| Anthony L. Wilson Chairman, President, and Chief Executive Officer of Mississippi Power |
Adopted 10b5-1 plan | May 8, 2023 | up to 1,360 | – | 10-Q Aug 3, 2023 |
| Christopher Cummiskey Executive Vice President |
Adopted 10b5-1 plan | May 4, 2023 | up to 22,064 | – | 10-Q Aug 3, 2023 |
From the XBRL of the company's 10-Qs and 10-Ks (Regulation S-K Item 408, reported since 2023): 15 filings checked since Apr 27, 2023.
Form 144 notices of planned sales
| Filed | Seller | Shares | Value | Shares came from | 10b5-1 plan | Form 4 sales after |
|---|---|---|---|---|---|---|
| Nov 6, 2026 | Sterling Spainhour Officer |
3,333 | $306,003 | Performance Stock Vest | adopted Nov 25, 2025 | 3,333 shares from Nov 6, 2026 |
| Nov 2, 2026 | MATTHEW KIM OFFICER |
100 | $9,339 | Performance Stock Vest | adopted Nov 25, 2025 | 100 shares from Nov 2, 2026 |
| Oct 1, 2026 | Matthew M. Kim OFFICER |
100 | $8,273 | Performance Stock Vest | adopted Nov 25, 2025 | 100 shares from Oct 1, 2026 |
| Sep 3, 2026 | PETER P SENA III Officer |
4,266 | $377,925 | RESTRICTED STOCK UNIT VEST | adopted May 5, 2026 | 4,266 shares from Sep 3, 2026 |
| Sep 3, 2026 | MATTHEW KIM Officer |
1,400 | $124,418 | Performance Stock Vest; Restricted Stock Unit Vest | none given | 1,500 shares from Sep 3, 2026 |
| Sep 1, 2026 | MATTHEW KIM OFFICER |
100 | $8,845 | PERFORMANCE STOCK VEST | adopted Nov 25, 2025 | 1,600 shares from Sep 1, 2026 |
| Aug 6, 2026 | STERLING SPAINHOUR OFFICER |
3,333 | $313,369 | PERFORMANCE STOCK VEST | adopted Nov 25, 2025 | 3,333 shares from Aug 6, 2026 |
| Aug 3, 2026 | Matthew Kim Officer |
100 | $9,428 | Performance Stock Vest | adopted Nov 25, 2025 | 200 shares from Aug 3, 2026 |
| Jul 1, 2026 | MATTHEW KIM OFFICER |
100 | $9,577 | PERFORMANCE STOCK VEST | adopted Nov 25, 2025 | 100 shares from Jul 1, 2026 |
| Jun 1, 2026 | Matthew M. Kim Officer |
100 | $9,116 | Performance Stock Unit Vest | adopted Nov 25, 2025 | 200 shares from Jun 1, 2026 |
| May 1, 2026 | Matthew Kim Officer |
100 | $9,657 | Performance Stock Unit Vest | adopted Nov 25, 2025 | 100 shares from May 1, 2026 |
| Mar 30, 2026 | KIMBERLY GREENE OFFICER |
25,000 | $2,416,750 | DIVIDEND REINVESTMENT; PERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VEST | adopted Nov 26, 2025 | none found |
| Mar 19, 2026 | Christopher Cummiskey Officer |
6,669 | $643,892 | PERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VEST | adopted Nov 18, 2025 | none found |
| Mar 18, 2026 | Stanley Connally Officer |
12,500 | $1,221,625 | PERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VEST | adopted Nov 17, 2025 | none found |
| Feb 24, 2026 | Matthew M. Kim Officer |
5,123 | $487,453 | Open Market Purchase; Performance Stock Unit Vest; Restricted Stock Unit Vest | adopted Nov 25, 2025 | none found |
From the Form 144 XML filed with the SEC, since Feb 24, 2026. The value is the seller's estimate on the notice. "Form 4 sales after" matches the seller's Form 4 sales in the 30 days after the notice, by name; Form 4s go back 180 days.
Work on SO in a spreadsheet:
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