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Southern Co. planned insider sales

In the last twelve months insiders at Southern Co. filed 15 Form 144 notices of planned sales, 62,324 shares worth $6.0 million at the time of filing, from 9 sellers. The latest, filed 6 November 2026: Sterling Spainhour (officer), 3,333 shares worth $306,003, planned for around 6 November 2026 through Merrill Lynch.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
6 November 2026Sterling SpainhourOfficer3,333$306,0036 November 2026None on Form 4 yetMerrill LynchPerformance Stock VestForm 144
2 November 2026Matthew KimOfficer100$9,3392 November 2026100 shares from 2 November 2026Merrill LynchPerformance Stock VestForm 144
1 October 2026Matthew M. KimOfficer100$8,2731 October 2026100 shares from 1 October 2026Merrill LynchPerformance Stock VestForm 144
3 September 2026Matthew KimOfficer1,400$124,4183 September 20261,400 shares from 3 September 2026Merrill LynchPerformance Stock Vest; Restricted Stock Unit VestForm 144
3 September 2026Peter P Sena IiiOfficer4,266$377,9253 September 20264,266 shares from 3 September 2026Merrill LynchRESTRICTED STOCK UNIT VESTForm 144
1 September 2026Matthew KimOfficer100$8,8451 September 2026100 shares from 1 September 2026MERRILL LYNCHPERFORMANCE STOCK VESTForm 144
6 August 2026Sterling SpainhourOfficer3,333$313,3696 August 20263,333 shares from 6 August 2026MERRILL LYNCHPERFORMANCE STOCK VESTForm 144
3 August 2026Matthew KimOfficer100$9,4283 August 2026100 shares from 3 August 2026Merrill LynchPerformance Stock VestForm 144
1 July 2026Matthew KimOfficer100$9,5771 July 2026100 shares from 1 July 2026MERRILL LYNCHPERFORMANCE STOCK VESTForm 144
1 June 2026Matthew M. KimOfficer100$9,1161 June 2026100 shares from 1 June 2026Merrill LynchPerformance Stock Unit VestForm 144
1 May 2026Matthew KimOfficer100$9,6571 May 2026100 shares from 1 May 2026Merrill LynchPerformance Stock Unit VestForm 144
30 March 2026Kimberly GreeneOfficer25,000$2.4 million30 March 202625,000 shares from 30 March 2026MERRILL LYNCHDIVIDEND REINVESTMENT; PERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VESTForm 144
19 March 2026Christopher CummiskeyOfficer6,669$643,89219 March 20266,669 shares from 19 March 2026Merrill LynchPERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VESTForm 144
18 March 2026Stanley ConnallyOfficer12,500$1.2 million18 March 202612,500 shares from 18 March 2026Merrill LynchPERFORMANCE STOCK UNIT VEST; RESTRICTED STOCK UNIT VESTForm 144
24 February 2026Matthew M. KimOfficer5,123$487,45324 February 20265,123 shares from 24 February 2026Merrill LynchOpen Market Purchase; Performance Stock Unit Vest; Restricted Stock Unit VestForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?